2011 Pacific typhoon season#Tropical Storm Noru

During each season, several national meteorological services and scientific agencies forecast how many tropical cyclones, tropical storms, and typhoons will form during a season and/or how many tropical cyclones will affect a particular country. These agencies include the Guy Carpenter Asia-Pacific Climate Impact Centre (GCACIC), of the City University of Hong Kong, the Tropical Storm Risk (TSR) Consortium of the University College London, and the Taiwan's Central Weather Bureau.

During January 2011, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) predicted that between twenty and twenty-three tropical cyclones were likely to develop and/or enter the Philippine area of responsibility during 2011.{{cite news|date=January 7, 2010|title=Cold weather affects Benguet mummies|newspaper=Manila Bulletin}} On March 20 the Hong Kong Observatory, predicted that the typhoon season in Hong Kong would be near to above normal with six to nine tropical cyclones passing within {{convert|500|km|mi|round=5|abbr=on}} of the territory against an average of around 6.{{cite web |url=http://www.weather.gov.hk/dhkovoice/speech20110323e.pdf |title=Speech by Dr. B Y Lee, Director of the Hong Kong Observatory March 23, 2011 |date=March 23, 2011 |author=Lee, B.Y. |publisher=Hong Kong Observatory |access-date=August 7, 2013 |archive-date=March 4, 2016 |archive-url=https://web.archive.org/web/20160304072907/http://www.weather.gov.hk/dhkovoice/speech20110323e.pdf |url-status=dead }} On March 30, the TSR Consortium released their first forecast of the season and predicted that the basin would see a near average season with 27.8 tropical storms, 17.5 typhoons, 7.8 "intense" typhoons and an ACE index of about 275.{{#tag:ref|According to the TSR, an intense tropical cyclone is a tropical cyclone with maximum 1-minute sustained winds greater than {{convert|175|km/h|mph|abbr=on|round=5}}.|group="nb"}} In early April, the China Meteorological Administration (CMA) predicted that between 24 and 26 tropical storms would develop or move into the basin during the year, which it noted was higher than the previous total of 14.{{cite conference|title=Member Report: China |url=http://www.typhooncommittee.org/44th/Docs/item4_teco/item4.2%20Members%20report/Member%20Report_China_2011.pdf |date=January 30, 2012 |conference=Typhoon Committee 44th session |publisher=The Economic and Social Commission for Asia and the Pacific and World Meteorological Organization's Typhoon Committee |archive-url=https://web.archive.org/web/20160303222344/http://www.typhooncommittee.org/44th/Docs/item4_teco/item4.2%20Members%20report/Member%20Report_China_2011.pdf |archive-date=March 3, 2016 |page=22 |author=China Meteorological Administration |access-date=August 6, 2013 |url-status=live }} They also predicted that between seven and nine tropical storms would make landfall on China, with the first landing taking place before June 29 and the last landing taking place after October 7. On April 26, the Thai Meteorological Department predicted that two tropical storms would affect Thailand during 2011, with one affecting Upper Thailand during August or September, while one was expected to move through Southern Thailand during October or November.{{cite report|access-date=August 7, 2013|url=http://www.tmd.go.th/programs%5Cuploads%5Cforecast%5C2011-04-2d6_Seasonal_EN_093555.pdf|title=Early May to mid October 2011|type=Weather outlook for Thailand during Rainy Season|date=April 26, 2011|publisher=Thai Meteorological Department}}{{dead link|date=February 2017|bot=medic}}{{cbignore|bot=medic}}

During May within its first outlook for the year, the GCACIC predicted that the season would be near average with 31 tropical cyclones, 27 tropical storms and 17 typhoons developing during the season.{{cite report|publisher=City University of Hong Kong |author=Guy Carpenter Asia-Pacific Climate Impact Center |url=http://www.cityu.edu.hk/gcacic/Research%20Brief_2011-02.pdf |date=May 9, 2010 |access-date=August 6, 2013 |title=May 2011 Predictions of Seasonal Tropical Cyclone Activity over the Western North Pacific |archive-url=https://web.archive.org/web/20120616082241/http://www.cityu.edu.hk/gcacic/Research%20Brief_2011-02.pdf |archive-date=June 16, 2012 |url-status=live }} They also predicted that seven tropical cyclones would make landfall on Southern China, between May and December, compared with an average of five while predicting that six tropical cyclones during the whole year compared to an average of four tropical cyclones. TSR revised its initial prediction during May and subsequently predicted that 28.0 tropical storms, 17.7 typhoons, 7.6 "intense" typhoons and an ACE index of about 266. In late June after a near-normal start to the season Taiwan's Central Weather Bureau predicted that the season, would be near average of 25.7 with 22–26 tropical storms occurring over the basin during 2011. Between three and five of the systems were predicted to affect Taiwan, compared to an average of around 3.6. Within its July forecast update, the GCACIC predicted that seven tropical cyclones would make landfall on Southern China, between July and December compared to an average of four and that there would now be 16 typhoons due to the strength of the India-Burma trough.{{cite report|publisher=City University of Hong Kong |title=Updated Prediction of Seasonal Tropical Cyclone Activity over the Western North Pacific for 2011 |date=July 4, 2011 |archive-date=June 16, 2012 |url=http://www.cityu.edu.hk/gcacic/Research%20Brief_2011-04.pdf |access-date=July 11, 2010 |author=Guy Carpenter Asia-Pacific Climate Impact Center |archive-url=https://web.archive.org/web/20120616082341/http://www.cityu.edu.hk/gcacic/Research%20Brief_2011-04.pdf |url-status=live }} They also predicted that seven tropical cyclones would pass within {{convert|100|km|mi|abbr=on}} of the Korean Peninsula or Japan, during July and December compared to an average of around three. Within its July update, TSR predicted that the ACE index would be about 194, after raising its prediction for the number of tropical storms to 28.0, typhoons to 18.1 and intense typhoons to 8.4. On August 4, TSR subsequently slightly revised these predictions within its final update for 2011 to 28.2 tropical storms, 17.9 typhoons, 8.0 "intense" typhoons and an ACE index of about 281.

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{{see also|Timeline of the 2011 Pacific typhoon season}}

During April, two tropical depressions developed but they failed to intensify into tropical storms. Tropical Storm Aere (Bebeng) then developed on May 5, and after causing ₱2.25 billion in damage to Northeastern Luzon and Eastern Visayas, the name Bebeng was retired by PAGASA. The second tropical storm of the season then developed on May 19, and affected the Philippines, Taiwan and Japan before becoming extratropical to the east of Japan.

After Tropical Storm Banyan dissipated during October 14, no tropical storms or typhoons were observed within the basin until Tropical Depression 27W developed into Tropical Storm Washi during December 15, due to high vertical windshear and a strong northeast monsoon.{{cite web |title=Annual Report on the Activities on the RSMC Tokyo - Typhoon Center |url=https://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2011/Text/Text2011.pdf |publisher=Japan Meteorological Agency |date=2011}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter = JMA

| Image = Tropical_Depression_01W_2011-04-01.jpg

| Formed = April 1

| Dissipated = April 4

| Track = 01W 2011 track.png

| Pressure = 1004

| 10-min winds = 30

| 1-min winds = 30

}}

On April 1, the JMA reported that a tropical depression had developed within an area of moderate vertical wind shear about {{convert|510|km|mi|round=5|abbr=on}} to the southeast of Ho Chi Minh City in Southern Vietnam.{{cite web|publisher=Japan Meteorological Agency |date=April 1, 2011 |url=http://www.jma.go.jp/en/g3/ |title=JMA WWJP25 Warning and Summary April 1, 2011 06z |archive-url=https://archive.today/20240522172752/https://www.webcitation.org/5xcadEqAq?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201104010600.htm |archive-date=May 22, 2024 |access-date=October 27, 2013 |url-status=live }}{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 1, 2011 |access-date=May 7, 2011 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=May 23, 2024 |archive-url=https://archive.today/20240523155703/https://www.webcitation.org/5xdgjh6qn?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201104011730.htm |title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans |url-status=dead }} Over the next day, the system gradually developed further, before the JTWC initiated advisories on the system and designated it as Tropical Depression 01W.{{cite web|title=Tropical Depression 01W Warning 1 |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 |access-date=October 28, 2013 |author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 2, 2011 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/ |url-status=dead }} However, within hours of this, the depression became devoid of convection as wind shear buffeted the system. This prevented the cyclone from intensifying beyond depression status as it remained nearly stationary.{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 2, 2011 |access-date=May 7, 2011 |title=Tropical Depression 01W Advisory Two |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201104020900.htm |url-status=dead |archive-url=https://archive.today/20240523155735/https://www.webcitation.org/5xeU9ZRrB?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201104020900.htm |archive-date=May 23, 2024 }} The JMA continued to monitor the system as a tropical depression for another day before issuing their last warning on the system.{{cite web|publisher=Japan Meteorological Agency |date=April 4, 2011 |access-date=May 7, 2011 |title=JMA High Seas Forecast for 0600 UTC on 4 April 2011 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }} According to a Vietnam Television's brief reports on the storm during their weather forecast report aired the day after its dissipation, some of its remnants has travelled towards the mainland and combine with other disturbances from the Bay of Bengal, created heavy rainfall which affects parts of the Southeast region of the country, with the Tan Son Nhat airport being delayed up to hours.{{cite web | url=https://www.youtube.com/watch?v=qW3EIttoi4k|title=Du bao thoi tiet Quang Tri hom nay ngay mai 3 ngay toi 84|trans-title=Weather forecast for Quang Tri province for today, tomorrow and the next three days|website=YouTube|date=April 13, 2012|access-date=February 5, 2025|language=vi}}

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{{Infobox tropical cyclone small

| Basin = WPac

| Image = Tropical Depression Amang Apr 5 2011 0355Z.jpg

| Formed = April 3

| Dissipated = April 6

| Track = Amang 2011 track.png

| Pressure = 1000

| 10-min winds = 30

| 1-min winds = 30

}}

On March 30, the JMA began monitoring an area of low pressure located southwest of Yap.{{cite web|publisher=Japan Meteorological Agency |date=March 30, 2011 |access-date=May 8, 2011 |title=JMA High Seas Forecast for 1800 UTC on March 30, 2011 |url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201103301800.htm |url-status=dead |archive-url=https://archive.today/20240523155616/https://www.webcitation.org/5xaxB8LYq?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201103301800.htm |archive-date=May 23, 2024 }} By April 2, the system developed a low-level circulation, though convection appeared disorganized. Exhibiting good outflow within a region of weak wind shear, the low was anticipated to develop further over the following several days as it drifted west-northwestward.{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 2, 2011 |access-date=May 8, 2011 |title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans |url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |url-status=dead |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |archive-date=February 16, 2007 }} After briefly stalling early on April 3, the storm turned towards the east. Additionally, the JMA considered the system sufficiently organized to be declared a tropical depression.{{cite web|url-status=dead |archive-date=May 2, 2001 |access-date=March 26, 2012 |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-04-03 00z |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency }}{{cite web|url-status=dead |archive-date=May 2, 2001 |title=JMA WWJP25 Warning and Summary 2011-04-03 06z |access-date=March 26, 2012 |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency }} As the system was located to the west of 135°E, PAGASA began issuing advisories on the depression as well, assigning it the name "Amang".{{cite web|publisher=Philippine Atmospheric Geophysical and Astronomical Services Administration |date=April 3, 2011 |access-date=May 8, 2011 |title=Tropical Depression "Amang" Severe Weather Bulletin One |url=http://dynasmon.fortunecity.com/PAGASA.html |url-status=dead |archive-url=https://web.archive.org/web/20090726132915/http://dynasmon.fortunecity.com/PAGASA.html |archive-date=July 26, 2009 }} Tracking northeastward, the depression eventually developed enough convection to be declared Tropical Depression 02W by the JTWC on April 4. However, this was expected to be brief as a decaying frontal boundary approached from the west and prompted the system to undergo an extratropical transition.{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 5, 2011 |access-date=May 8, 2011 |title=Prognostic Reasoning for Tropical Depression 02W Advisory One |url=http://weather.noaa.gov/pub/data/raw/wd/wdpn31.pgtw..txt |url-status=live |archive-url=https://web.archive.org/web/20030831153200/http://weather.noaa.gov/pub/data/raw/wd/wdpn31.pgtw..txt |archive-date=August 31, 2003 }} This intensification prompted the National Weather Service (NWS) in Tiyan, Guam to issue a tropical storm warning for the islands of Agrihan, Pagan and Alamagan.{{cite web|author=Michael G. Middlebrooke |work=National Weather Service Office in Tiyan, Guam |publisher=National Oceanic and Atmospheric Administration |date=April 5, 2011 |access-date=May 8, 2011 |title=Tropical Depression 02W Advisory Number One |url=http://gwydir.demon.co.uk/advisories/WTPQ31-PGUM_201104050247.htm |url-status=dead |archive-url=https://archive.today/20240523155819/https://www.webcitation.org/5xiF7ga1T?url=http://gwydir.demon.co.uk/advisories/WTPQ31-PGUM_201104050247.htm |archive-date=May 23, 2024 }} Interacting with the front and high wind shear, the system became partially exposed and elongated as it moved over cooler waters.{{cite web|author=Joint Typhoon Warning Center |date=April 5, 2011 |access-date=May 8, 2011 |title=Prognostic Reasoning for Tropical Depression 02W Advisory Three |url=http://weather.noaa.gov/pub/data/raw/wd/wdpn31.pgtw..txt |url-status=live |archive-url=https://web.archive.org/web/20030831153200/http://weather.noaa.gov/pub/data/raw/wd/wdpn31.pgtw..txt |archive-date=August 31, 2003 }} Early on April 6, the JTWC issued their final advisory on the depression as it began to dissipate over open waters.{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |date=April 6, 2011 |access-date=May 8, 2011 |title=Tropical Depression 02W Advisory Five (Final) |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }}

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{{main|Tropical Storm Aere (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = May 6

| Dissipated = May 12

| Image = Aere 2011-05-07 0230Z.jpg

| Track = Aere 2011 track.png

| 10-min winds = 40

|category:cat1

| 1-min winds = 50

| Pressure = 992

}}

On May 3, the JTWC started to monitor a tropical disturbance that had developed within a monsoon trough about {{convert|140|km|mi|abbr=on}} to the west of Palau.{{cite web|author=Joint Typhoon Warning Center|publisher=United States Navy, United States Air Force|access-date=March 10, 2012|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt|archive-url=https://archive.today/20240522172828/https://www.webcitation.org/5yQGmeicP?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201105031400.htm|title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans 2011-05-03 14z|url-status=dead|archive-date=May 22, 2024}} At this time the disturbances low level circulation center was weak and unorganized, while a minimal amount of deep convection was observed around the system. Over the next couple of days the depression gradually developed further in an area of low vertical wind shear before it was declared a tropical depression by the JMA and the JTWC during May 6.{{cite conference|title=Summary of the 2011 Pacific Typhoon Season |author=RSMC Tokyo — Typhoon Centre |url=http://www.typhooncommittee.org/44th/Docs/item4_teco/item%204.1%20RSMC/4.1%20add2%20Review%202011%20Typhoon%20Season-RSMC.pdf |date=January 30, 2012 |location=Hangzhou, China |conference=Typhoon Committee 44th session |conference-url=http://www.typhooncommittee.org/44th/ |archive-date=August 26, 2014 |publisher=The Economic and Social Commission for Asia and the Pacific and World Meteorological Organization's Typhoon Committee |archive-url=https://web.archive.org/web/20140826161805/http://www.typhooncommittee.org/44th/Docs/item4_teco/item%204.1%20RSMC/4.1%20add2%20Review%202011%20Typhoon%20Season-RSMC.pdf |page=6 |access-date=March 5, 2012 |url-status=live }} In the same evening, PAGASA upgraded the low pressure into a tropical depression and assigned its local name 'Bebeng'. On the afternoon of May 7, JMA upgraded the depression to a tropical storm and assigned the name 'Aere'. During the early morning of May 12, the JMA downgraded Aere to a tropical depression while south of Kyushu Island as it became a weak extratropical cyclone. Its extratropical remnants finally dissipated on May 15.

Throughout the Philippines, multiple agencies activated their emergency plans as the storm approached. The Armed Forces of the Philippines, the Philippine National Police, and the Philippine Coast Guard were all placed on standby to deploy to areas struck by Aere once the storm passed. Several ports were affected by the storm, stranding 1,379 passengers by the afternoon of May 7.{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=May 7, 2011 |access-date=May 7, 2011 |title=NDRRMC Update Initial Report on Tropical Depression "Bebeng" |url=http://ndcc.gov.ph/attachments/article/208/NDRRMC%20Update%20Initial%20Report%20on%20Tropical%20Depression%20_Bebeng_%207%20May%202011.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110823020737/http://ndcc.gov.ph/attachments/article/208/NDRRMC%20Update%20Initial%20Report%20on%20Tropical%20Depression%20_Bebeng_%207%20May%202011.pdf |archive-date=August 23, 2011 }} According to the National Disaster Risk Reduction and Management Council, at least 35 people have been killed and two more are missing as a result of Aere. Agricultural losses are estimated at ₱1.37 billion ($31.7 million).{{cite report|title=Situation Report No. 14 on Tropical Storm "Bebeng" (Aere) |publisher=National Disaster Risk Reduction and Management Center |url=http://www.ndrrmc.gov.ph/attachments/article/208/NDRRMC%20Sitrep%20No.%2014%20re%20TS%20Bebeng%2016%20May%202011,%206PM.pdf |author=Ramos, Benito T. |date=May 16, 2011 |access-date=December 31, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20120502002223/http://www.ndrrmc.gov.ph/attachments/article/208/NDRRMC%20Sitrep%20No.%2014%20re%20TS%20Bebeng%2016%20May%202011%2C%206PM.pdf |archive-date=May 2, 2012 }} Widespread flooding and landslides damaged homes, blocked off roads and severed communications. In Catarman, Northern Samar, {{convert|377.4|mm|in|abbr=on}} of rain fell in just 24 hours, resulted in significant flash flooding.{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=May 8, 2011 |access-date=May 8, 2011 |title=NDRRMC Update SitRep No. 3 on Tropical Storm "Bebeng" |url=http://ndcc.gov.ph/attachments/article/208/NDRRMC%20Sitrep%203%20re%20TD%20Bebeng%208May2011%2012%205%20PM.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110823020501/http://ndcc.gov.ph/attachments/article/208/NDRRMC%20Sitrep%203%20re%20TD%20Bebeng%208May2011%2012%205%20PM.pdf |archive-date=August 23, 2011 }}

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{{main|Typhoon Songda (2011)}}

{{Infobox hurricane small

|Basin=WPac

|Formed=May 19

|Dissipated=May 29

|Image=2011 Songda.jpg

|Track=Songda 2011 track.png

|10-min winds=105

|1-min winds=140

|Pressure=920

}}

A weak non-tropical system formed within the Intertropical Convergence Zone on May 17, as it moved in a westward direction. On May 19, the JTWC reported that an area of low pressure had persisted about {{convert|510|km|mi|abbr=on}} to the southeast of Yap. As the system moved towards the northwest under the influence of a subtropical ridge of high pressure, it rapidly consolidated in an area of light to moderate vertical wind shear. The JMA then started to monitor the system as a tropical depression later that day, before the JTWC designated it as Tropical Depression 04W early on May 20. The JTWC then reported later that day that the depression had intensified into a tropical storm with wind speeds of {{convert|65|km/h|mph|abbr=on|round=5}}, however, it later reported that it had overestimated the wind speeds and consequently lowered the storm's status to a tropical depression, based on observations from Yap island. Late on May 21, both the JMA and the JTWC reported that the depression had now become a tropical storm with the JMA naming it as Songda. Over the next couple of days, the system gradually intensified further while moving northwest into PAGASA's area of responsibility. PAGASA named it as Chedeng. At 12:00 UTC on May 24, the JTWC reported that Songda had intensified into a typhoon. 12 hours later, the JMA followed suit while the system was located about {{convert|800|km|mi|abbr=on}} to the southeast of Manila in the Philippines. It rapidly intensified into a Category 5 typhoon. On the afternoon of May 29, Songda became extratropical south of Shikoku Island.{{cite web|last=Suga|first=Masumi|title=Typhoon Songda Nearing Tokyo Weakens to 'Extratropical Cyclone'|url=https://www.bloomberg.com/news/2011-05-29/typhoon-songda-weakens-to-extratropical-cyclone-.html|publisher=Bloomberg|access-date=August 16, 2012|date=May 29, 2011}} The extratropical remnants of Sonda later crossed the International Date Line, which was later absorbed by another extratropical cyclone on June 4, and later dissipated completely over Alaska.

Although Songda remained offshore, heavy rains within the typhoon's outer bands impacted the Philippines, causing significant flash flooding and landslides. Four fatalities are attributed to the system there.{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=May 31, 2011 |access-date=August 4, 2011 |title=NDRRMC Update SitRep No. 15 on Typhoon "Chedeng" (Songda) |url=http://ndcc.gov.ph/attachments/article/215/NDRRMC%20Update%20Sitrep%20No.%2015%20CHEDENG31May2011,%206PM.pdf |url-status=dead |archive-url=https://web.archive.org/web/20111004150812/http://ndcc.gov.ph/attachments/article/215/NDRRMC%20Update%20Sitrep%20No.%2015%20CHEDENG31May2011%2C%206PM.pdf |archive-date=October 4, 2011 }} Further north, Okinawa experienced intense wind gusts, measured up to {{convert|198|km/h|mph|abbr=on}}, along with torrential rain.{{cite web|author=Unattributed|publisher=吟遊詩人の戯言|date=May 28, 2011|access-date=July 2, 2011|script-title=ja:【台風1102号】沖縄：久米島灯台 風速55メートル|url=http://gurizuri0505.halfmoon.jp/20110528/29502|language=ja}} Extensive damage took place across the area with losses reaching ¥23.2 billion ($287 million);{{cite web|author=Unattributed |publisher=Okinawa Times |date=June 23, 2011 |access-date=July 2, 2011 |script-title=ja:保険支払い２０億円に 台風２号 |url=http://www.okinawatimes.co.jp/article/2011-06-23_19539/ |language=ja |url-status=dead |archive-url=https://web.archive.org/web/20110624232630/http://www.okinawatimes.co.jp/article/2011-06-23_19539/ |archive-date=June 24, 2011 }} however, there were no fatalities.{{cite web|author=Unattributed|work=Accuweather|publisher=Star Tribune|date=May 29, 2011|access-date=July 2, 2011|title=57 Injured in Okinawa, Tokyo Next|url=http://www.startribune.com/weather/122801604.html}} As it became extratropical, Songda brought heavy rains from Kyushu to eastern Honshu, causing significant flooding. At least 13 people were killed in the country and an estimated 400,000 had to be evacuated around Tokyo alone.{{cite web|author=Unattributed|publisher=Earthweek|date=June 3, 2011|access-date=July 5, 2011|title=Typhoon Songda Floods Strike Japan Disaster Zone|url=http://www.earthweek.com/2011/ew110603/ew110603e.html|archive-date=June 6, 2011|archive-url=https://web.archive.org/web/20110606081610/http://www.earthweek.com/2011/ew110603/ew110603e.html|url-status=dead}}{{cite web|author=Unattributed |publisher=おもっしょい愛媛 |date=May 30, 2011 |access-date=July 5, 2011 |script-title=ja:台風２号：県内で車水没、１人死亡 新居浜では避難勧告 ／愛媛 – 毎日新聞 |url=http://ehime.gourmet47.info/modules/news/index.php?page=clipping&clipping_id=4798 |language=ja |url-status=dead |archive-url=https://web.archive.org/web/20120425045037/http://ehime.gourmet47.info/modules/news/index.php?page=clipping&clipping_id=4798 |archive-date=April 25, 2012 }}

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{{Main|Tropical Storm Sarika (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = June 8

| Dissipated = June 11

| Image = Sarika 2011-06-10 0525Z.jpg

| Track = Sarika 2011 track.png

| 10-min winds = 40

| 1-min winds = 30

| Pressure = 996

}}

On early June 8, an area of low pressure formed about {{convert|10|km|mi|abbr=on}} west of Cebu City, Philippines. As it moved towards the Mindoro Strait the JMA and JTWC began to monitor the system. In the early morning hours of June 9, the Philippines' PAGASA upgraded the system to a tropical depression and reported the storm center to be about {{convert|450|km|mi|abbr=on}} west of Dagupan in the Philippines. The next day, the JMA and JTWC upgraded the tropical depression into a tropical storm, with the JMA naming it Sarika. During the morning of June 11, the JTWC downgraded Sarika to a tropical depression after making landfall in Shantou, China. The JTWC soon issued their final advisory on Sarika. Sarika made landfall on mainland China with winds of {{convert|75|km/h|mph|abbr=on|round=5}}.

As a result of the storm, 23 people were killed in Xianning, and ten more were declared missing. Damages from Sarika are estimated at $248 million.{{Cite news|title=Tropical storm leaves 23 dead, 10 missing|url=http://gamutnews.com/20110611/20483/tropical-storm-leaves-23-dead-10-missing.html|date=June 11, 2011|access-date=June 11, 2011|archive-url=https://web.archive.org/web/20110725002001/http://gamutnews.com/20110611/20483/tropical-storm-leaves-23-dead-10-missing.html|archive-date=July 25, 2011|url-status=dead}}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = June 16

| Dissipated = June 25

| Image = Haima June 23 2011 03.20(UTC).jpg

| Track = Haima 2011 track.png

| 10-min winds = 40

| 1-min winds = 35

| Pressure = 985

}}

Two tropical disturbances formed in an area of convection and moderate vertical wind shear east of Mindanao, Philippines on June 13. Both of them started to interact with each other and the other one absorbed the moisture of the other disturbance. On June 15, the JTWC started to monitor an area of disturbed weather within that disturbance that was located about {{convert|1350|km|mi|abbr=on}}, to the southeast of Manila, Philippines. Over the next couple of days the system gradually developed further, before late on June 16, the JMA, JTWC and PAGASA, all reported that the system had developed into a tropical depression, with PAGASA naming it as Egay. Egay continued to develop during June 17, as it moved towards the northeast, and on June 18, the JTWC reported that Egay had intensified into a tropical storm. Fluctuations in intensity occurred over the next several days, before the JMA reported that the system had strengthened into a tropical storm on June 22, naming it Haima. The JTWC also followed suit, by upgrading it to a tropical storm again.{{cite web|title=Tropical storm Haima hits southern China, forcing ships to stop service|url=http://news.xinhuanet.com/english2010/china/2011-06/22/c_13944284.htm|archive-url=https://web.archive.org/web/20110625032202/http://news.xinhuanet.com/english2010/china/2011-06/22/c_13944284.htm|url-status=dead|archive-date=June 25, 2011|publisher=Lu Hui|access-date=June 22, 2011}}

During the evening of June 23, the JTWC downgraded Haima to a tropical depression after making landfall in Zhanjiang, Guangdong, China but upgraded it to a tropical storm again on June 24,. Early on June 25, Haima became a tropical depression after moving inland in Vietnam. As it made landfall over Hanoi, Vietnam, the JTWC and the Hong Kong Observatory downgraded Haima to a low-pressure area.{{citation needed|date=September 2013}}

During the period when the storm affected Vietnam, the highest wind gust recorded on land was {{convert|23|m/s|km/h mph|0|abbr=on|order=out|round=5}}, observed in Thái Bình. Heavy rainfall of 100 mm or more was recorded in many areas across the Northern and North Central regions. The lowest atmospheric pressure during the storm was {{convert|986.4|hPa|inHg|2|abbr=on|order=out|round=}}, recorded at a weather station in Văn Lý (Nam Định). Haima has killed 28 people and left 4 others missing in Vietnam.{{Cite book |url=http://danida.vnu.edu.vn/cpis/files/Dac_Diem_KTTV/dacdiemkttv_2011.pdf |title=Đặc điểm Khí tượng Thuỷ văn năm 2011 |publisher=National Center for Hydro-Meteorological Forecasting |year=2012 |location=Hanoi, Vietnam |publication-place= |page= |pages=21-30 |language=vi |trans-title=Meteorological and Hydrological Characteristics of Vietnam in 2011 |archive-url=https://web.archive.org/web/20250330122848/http://danida.vnu.edu.vn/cpis/files/Dac_Diem_KTTV/dacdiemkttv_2011.pdf |archive-date=March 30, 2025 |url-status=live}}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = June 20

| Dissipated = June 27

| Image = Meari Jun 25 2011 0440Z.jpg

| Track = Meari 2011 track.png

| 10-min winds = 60

| 1-min winds = 55

| Pressure = 975

}}

{{main|Tropical Storm Meari (2011)}}

Early on June 20, an area of low pressure about {{convert|760|km|mi|abbr=on}}, east of the Philippines began to be monitored by both the JTWC and JMA. That evening, the JTWC issued a Tropical Cyclone Formation Alert. Soon afterwards, PAGASA upgraded the system into a tropical depression, naming it as "Falcon". At the time of the upgrade, Falcon was located about {{convert|1000|km|mi|abbr=on}}, east northeast of Cebu City. During the evening of June 21, the JTWC also reported that Falcon had strengthened into a tropical depression. On June 22, both the JTWC and the JMA upgraded Falcon into a tropical storm, and the JMA named it Meari. Meari left the Philippines with 2 deaths and 5 people missing. On the afternoon on June 24, the JMA upgraded Meari to a severe tropical storm as it passed Okinawa, Japan.

On June 26, Meari rapidly moved to the Yellow Sea but slowly passed Weihai, Shandong, China, and then the JMA downgraded Meari to a tropical storm on the same day. On June 27, the JTWC downgraded Meari to a tropical depression before it made landfall on North Korea, and the JMA reported that Meari became a low-pressure area later.

Heavy rains from the storm's outer bands triggered significant flooding and landslides in South Korea. At least nine people were killed and three others were reported missing across the country.{{cite web|author=Lee Hyo-sik|publisher=Korea Times|date=June 27, 2011|access-date=August 4, 2011|title=Typhoon Meari kills 9, leaves 3 missing |url=https://www.koreatimes.co.kr/www/news/nation/2011/06/117_89661.html}} In North Korea, heavy rains from the storm caused widespread flooding and damage. At least 160 homes were destroyed and 50,000 hectares of crops submerged. Several reports of confirmed fatalities arose but no details on how many were given to news agencies.{{cite web|author=Unattributed|work=Straits Times |location=Singapore |date=July 12, 2011|access-date=August 4, 2011|title=Storm leaves casualties, destroys homes in N. Korea |url=http://www.straitstimes.com/BreakingNews/Asia/Story/STIStory_689771.html| archive-url= https://web.archive.org/web/20110720063354/http://www.straitstimes.com/BreakingNews/Asia/Story/STIStory_689771.html| archive-date= July 20, 2011 | url-status= live}}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter =

| Formed = July 8

| Dissipated = July 10

| 10-min winds = 25

| 1-min winds =

| Image = Goring Jul 9 2011 0450Z.jpg

| Track = Goring 2011 track.png

| Pressure = 998

}}

Late on July 8, an area of low pressure formed about {{convert|300|km|mi|abbr=on}} east of Aurora. The center was {{convert|460|km|mi|abbr=on}} north of Basco, Batanes.{{cite web|last=Flores|first=Helen|title='Goring' exits; rains to prevail|url=http://www.philstar.com/Article.aspx?articleId=704877|publisher=The Philippine Star|access-date=August 16, 2012|date=July 11, 2011|archive-url=https://archive.today/20130208163318/http://www.philstar.com/Article.aspx?articleId=704877|archive-date=February 8, 2013|url-status=dead}} On the morning of July 9, JMA upgraded the system to a tropical depression. It was located {{convert|450|km|mi|abbr=on}} northeast of Cagayan. In the afternoon, PAGASA upgraded the low-pressure area into a tropical depression and named it Goring.{{cite web|title=Tropical depression 'Goring' to bring more rain|url=http://www.abs-cbnnews.com/nation/07/09/11/tropical-depression-goring-bring-more-rain|access-date=July 9, 2011|publisher=Bettina Magsaysay, ABS-CBN}} After making landfall on Fujian, China, it dissipated on the evening on July 10. However, the JMA classified the system as a tropical depression until the evening of July 10.{{citation needed|date=September 2013}}

{{clear}}

{{main|Typhoon Ma-on (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = July 11

| Dissipated = July 24

| Image = Typhoon Ma-on Jul 16 2011 0145Z.jpg

| Track = Ma-on 2011 track.png

| 10-min winds = 95

| 1-min winds = 115

| Pressure = 935

}}

An area of convection spawned a small area of low pressure on the morning of July 9. It became a tropical disturbance as it passed over the warm waters of the Pacific Ocean. On July 11, both the JMA and JTWC upgraded the tropical disturbance to a tropical depression which was located near Minamitorishima. On July 12, both the JMA and JTWC upgraded the system to a tropical storm and named it Ma-on. Early on July 13, the JMA upgraded Ma-on to a severe tropical storm and later that day strengthened into a typhoon. After absorbing Tokage, Ma-on reached its peak intensity on July 16. The PAGASA named it Ineng on July 17.

While Ma-on was affecting Japan, the JTWC downgraded it to a tropical storm in the evening on July 19, before making landfall on Tokushima later in the day. The JMA downgraded Ma-on to a severe tropical storm after it made landfall in Wakayama early on July 20. The JTWC downgraded Ma-on to a tropical depression on July 21, and discontinued advisories the following day. The JMA downgraded Ma-on to a tropical storm early on July 23 and transitioned into an extratropical cyclone east of the Tōhoku region the next day.

{{Clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = July 13

| Dissipated = July 15

| Image = Tokage 2011-07-15.jpg

| Track = Tokage 2011 track.png

| 10-min winds = 35

| 1-min winds = 30

| Pressure = 1000

}}

On July 11, the JTWC started to monitor a tropical disturbance that had developed within a poorly organized monsoon trough about {{convert|1000|km|mi|round=5|sp=us}} to the northwest of Hagatna, Guam. Over the next couple of days, the disturbance moved towards the west and despite the system being in an area of low vertical wind shear, deep convection surrounding the system struggled to organize around the disturbances low level circulation center. However, by 06:00 UTC on July 13, it had organized enough for the JMA to declare the disturbance a tropical depression. Over the next two days, the system continued to move towards the west and gradually consolidated further. The JMA then named the system as Tokage, as it had developed into a tropical storm and reached its 10-minute peak wind speeds of {{convert|65|km/h|mph|abbr=on|round=5}}. PAGASA then initiated advisories on the system and named it Hanna, before the JTWC designated the system as Tropical Depression 09W and initiated advisories on the system, while it was at its 1-minute peak wind speeds of {{convert|55|km/h|mph|abbr=on|round=5}}. However, by this time Tokage was already interacting with Typhoon Ma-on, with Ma-on's outflow exposing Tokage's low level circulation center, and displacing convection to the west. The JMA, PAGASA and the JTWC then issued their final advisories on the system later that day as the remnants of Tokage was absorbed into Ma-on, due to the Fujiwhara effect late on July 15.

{{clear}}

{{main|Tropical Storm Nock-ten (2011)}}

{{see also|2011 Thailand floods}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = July 24

| Dissipated = July 31

| Image = Nock-ten 2011-07-26 0535Z.jpg

| Track = Nock-ten 2011 track.png

| 10-min winds = 50

| 1-min winds = 65

| Pressure = 985

}}

Early on July 22, an area of low pressure formed to the east of Philippines.{{cite web|title=NWS Guam — Tropical Weather Advisory 1 for Pre-Tropical storm Nock-ten |url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |publisher=National Oceanic and Atmospheric Administration |access-date=July 27, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |archive-date=February 16, 2007 }} The system gradually drifted west over the next few days and late on July 24, the JTWC started monitoring the system as a Tropical Depression.{{cite web|title=JTWC — Tropical Depression 10W — Warning 001 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=July 27, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Early the next day, the JMA upgraded the area of low pressure into a Tropical Depression.{{cite web|title=JMA Tropical Cyclone Advisory 250000|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 27, 2011}} A few hours later, the PAGASA started monitoring the tropical depression and named it 'Juaning'.{{cite web|title=PAGASA — Severe Weather Bulletin Number ONE |url=http://dynasmon.fortunecity.com/PAGASA.html |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |access-date=July 27, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20090726132915/http://dynasmon.fortunecity.com/PAGASA.html |archive-date=July 26, 2009 }} The system continued to drift westwards and strengthened rapidly, that on midnight, that day, the JMA further upgraded the system into a Tropical Storm, naming it Nock-Ten.{{cite web|title=JMA Tropical Cyclone Advisory – 260000 |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201107260000.htm |publisher=Japan Meteorological Agency |access-date=July 27, 2011 |url-status=dead |archive-url=https://archive.today/20240523002526/https://www.webcitation.org/60SckyNAg?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201107260000.htm |archive-date=May 23, 2024 }} Early on July 27, the JMA reported that Nock-ten continued to strengthen and upgraded it into a Severe Tropical Storm.{{cite web|title=JMA Tropical Cyclone Advisory – 270600|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 27, 2011}} A few hours later, the JTWC reported that Nock-ten rapidly intensified to a category 1 typhoon and made its landfall over northern Aurora (province) and started weakening.{{cite web|title=JTWC — Typhoon 10W — Warning 11 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=July 27, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Later the same day, the JMA reported that Nock-ten has exited the Luzon island at Candon maintaining severe tropical storm strength.{{cite web|title=JMA Tropical Cyclone Advisory – 271200|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 27, 2011}} However, overnight, the storm rapidly weakened and the JMA downgraded it into a minor tropical storm the next day.{{cite web|title=JMA Tropical Cyclone Advisory – 280600|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 28, 2011}} However, on July 29, the storm gradually regained strength and approached south China coast at Qionghai, China.{{cite web|title=JMA — Tropical Storm Advisory 290900 – Tropical Storm Nock-ten|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 29, 2011}} Later that day, the storm strengthened over land and headed north towards Hainan's provincial capital region Haikou.{{cite web|title=JMA Tropical Cyclone Advisory 291200 – Tropical Storm nock-ten|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 29, 2011}} Over the next day, the storm drifted to the west and made landfall over Northern Vietnam.{{cite web|title=JMA — Tropical Cyclone Advisory 301200 – Tropical Storm Nock-ten |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201107301200.htm |publisher=Japan Meteorological Agency |access-date=July 31, 2011 |url-status=dead |archive-url=https://archive.today/20240523160218/https://www.webcitation.org/60ZNvP291?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201107301200.htm |archive-date=May 23, 2024 }} The lowest atmospheric pressure during the storm was {{convert|984.6|hPa|inHg|2|abbr=on|order=out|round=}}, recorded at a weather station in Tĩnh Gia (Thanh Hoá). The storm weakened rapidly and at midnight that day, the JMA, issuing their final warning on the system, downgraded it into a tropical low.{{cite web|title=JMA — Tropical Cyclone Advisory 310000 – Post-Tropical Storm Nock-ten|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=July 31, 2011}}

The provinces of Albay and Camarines were reported to be completely flooded by the rain.{{cite web|title=Pictures: Storm kills 25 in Philippines|url=http://www.straitstimes.com/BreakingNews/SEAsia/Story/STIStory_695303.html|publisher=Singapore Press Holdings Ltd|access-date=July 27, 2011| archive-url= https://web.archive.org/web/20110727052110/http://www.straitstimes.com/BreakingNews/SEAsia/Story/STIStory_695303.html| archive-date= July 27, 2011 | url-status= live}} Minor damage to rice crops was reported. Additional heavy rain was expected throughout the day while Nock-ten moved into the South China Sea.{{cite news|title=Nock-Ten exits Philippines, 25 dead|url=https://af.reuters.com/article/commoditiesNews/idAFL3E7IR26M20110727|archive-url=https://web.archive.org/web/20110816082645/http://af.reuters.com/article/commoditiesNews/idAFL3E7IR26M20110727|url-status=dead|archive-date=2011-08-16|publisher=Thomson Reuters|access-date=July 27, 2011|newspaper=Reuters|date=2011-07-27}} The number of missing was also pushed up to 31 after 25 crewmembers of a fishing boat were reported missing when their fishing boat was caught in the storm off Masbate.{{cite web|title=At least 25 dead, 31 missing as Nock-Ten lands in Philippines|url=http://news.xinhuanet.com/english2010/world/2011-07/27/c_131013786.htm|archive-url=https://web.archive.org/web/20120307002516/http://news.xinhuanet.com/english2010/world/2011-07/27/c_131013786.htm|url-status=dead|archive-date=March 7, 2012|agency=Xinhua News Agency|access-date=July 27, 2011}} Nock-ten suspended all classes in Luzon from pre-school to college levels on July 26 and 27.{{cite web|url=http://www.gmanews.tv/story/227543/nation/classes-suspended-in-ncr-other-areas-in-luzon-due-to-juaning |title=Classes suspended in NCR, other areas in Luzon due to 'Juaning' |publisher=GMA News |date=2011-07-27 |access-date=2013-12-20}} In Northern Luzon, Nock-ten poured down heavy rainfall becoming widespread flooding in the area. The national roads were impassable and landslides were also reported.{{cite web|url=http://www.gmanews.tv/story/227583/regions/juaning-strands-1600-roads-in-car-c-luzon-impassable |title='Juaning' strands 1,600; roads in CAR, C. Luzon impassable |publisher=GMA News |date=2011-07-27 |access-date=2013-12-20}} About 26 domestic flights were cancelled from July 26 to 27 due to heavy rains and strong winds.{{cite web|url=http://www.abs-cbnnews.com/nation/07/26/11/20-domestic-flights-cancelled-due-juaning |title=26 domestic flights cancelled due to 'Juaning' |publisher=ABS-CBN News |date=2011-07-26 |access-date=2013-12-20}}

{{clear}}

{{main|Typhoon Muifa (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = July 27

| Dissipated = August 9

| Image = Muifa 2011-07-30 1725Z.jpg

| Track = Muifa 2011 track.png

| 10-min winds = 95

| 1-min winds = 140

| Pressure = 930

}}

Late on July 23, an area of low pressure formed to the southeast of Chuuk.{{cite web|title=NWS Guam — Tropical Cyclone Advisory 231930 for pre-tropical storm Muifa |url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |publisher=NOAA |access-date=July 28, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |archive-date=February 16, 2007 }} the system gradually drifted to the west and on July 25, the JTWC upgraded the low-pressure area to a tropical depression. At that time, it was located approximately {{convert|505|nmi}} to the west of Guam.{{cite web|title=JTWC — Tropical Cyclone Advisory 001 – Pre-tropical storm Muifa |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |author=Joint Typhoon Warning Center |access-date=July 28, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |archive-date=April 30, 2001 }} At midnight, that day, the JMA started monitoring the system as a tropical depression.{{cite web|title=JMA — Tropical Cyclone Advisory 260000 – Pre-tropical storm Muifa |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107260000.htm |publisher=Japan Meteorological Agency |access-date=July 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523101514/https://www.webcitation.org/60Sd1kaqw?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107260000.htm |archive-date=May 23, 2024 }} Early on July 28, the JTWC upgraded the system into a Tropical Storm.{{cite web|title=JTWC — Tropical Storm 11W — Warning 011 |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201107280300.htm |author=Joint Typhoon Warning Center |access-date=July 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523101633/https://www.webcitation.org/60VpPt4EC?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201107280300.htm |archive-date=May 23, 2024 }} A few hours later, the JMA too upgraded the system to a tropical storm, naming it Muifa.{{cite web|title=JMA — Tropical Cyclone Advisory 280600 – Tropical Storm Muifa |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107280600.htm |publisher=Japan Meteorological Agency |access-date=July 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523101554/https://www.webcitation.org/60VpA9ynR?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107280600.htm |archive-date=May 23, 2024 }} Soon, the storm moved into the Philippine area of responsibility and the PAGASA named it Kabayan.{{cite web|title=PAGASA — Severe Weather Bulletin Number ONE — Tropical Storm Kabayan |url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201107280900.htm |publisher=PAGASA |access-date=July 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523101714/https://www.webcitation.org/60Vpzd5JJ?url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201107280900.htm |archive-date=May 23, 2024 }} The storm gradually drifted north over the next day maintaining strength. On the night of July 29, Muifa was upgraded into a severe tropical storm.{{cite web|title=JMA Tropical Cyclone Advisory 300000 for Severe Tropical Storm Muifa |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107300000.htm |publisher=Japan Meteorological Agency |access-date=July 30, 2011 |url-status=dead |archive-url=https://archive.today/20240523101753/https://www.webcitation.org/60Yr2rA8z?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201107300000.htm |archive-date=May 23, 2024 }} Overnight, the storm strengthened rapidly and was upgraded into a typhoon the next morning.{{cite web|title=JMA — Tropical Cyclone Advisory 300600 – Typhoon Muifa |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |publisher=Japan Meteorological Agency |access-date=July 30, 2011 |url-status=live |archive-url=https://web.archive.org/web/20081014125540/http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-date=October 14, 2008 }} The storm strengthened so rapidly, and the JTWC reported that the storm's peak winds were reaching {{convert|140|kn}} (1-min sustained), as it strengthened into a Category 5 Typhoon. However, the typhoon couldn't maintain Category 5 strength for a long time. According to the JTWC, On July 31, the typhoon interacted with an upper-level trough and weakened into a Category 4 typhoon.{{cite web|title=JTWC — Super Typhoon Muifa — Warning 24 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |author=Joint Typhoon Warning Center |access-date=July 31, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |archive-date=April 30, 2001 }} The system gradually moved north, then turned west and drifted towards Okinawa, before turning northwest again, when it was finally downgraded to a tropical storm by the JTWC.{{cite web|title=JTWC — Tropical Cyclone Warning 51 – Post-Super Typhoon Muifa |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 7, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |archive-date=April 30, 2001 }} Soon afterwards, the JMA too downgraded Muifa to a Severe Tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 070600 – Severe Tropical Storm Muifa |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |publisher=Japan Meteorological Agency |access-date=August 7, 2011 |url-status=live |archive-url=https://web.archive.org/web/20081014125540/http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-date=October 14, 2008 }} After weakening to a tropical storm, Muifa made landfall at the estuary of the Yalu River on August 8, and the JTWC issued the final warning. Early on August 9, Muifa weakened to a tropical depression over northeast China and became a low-pressure area later.

Muifa killed 2 men, as their boat was capsized in the vicinity of Hagonoy, Bulacan and Pampanga Delta.{{cite web|title=NDRRMC Update re SitRep No. 2 on Tropical Storm "Kabayan" (Muifa) |url=http://www.ndcc.gov.ph/attachments/article/257/NDRRMC%20Update%20SitRep%20No.%202%20for%20Tropical%20Storm%20KABAYAN%20(Muifa).pdf |publisher=National Disaster Risk Reduction and Management Council |access-date=July 30, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20111007120419/http://www.ndcc.gov.ph/attachments/article/257/NDRRMC%20Update%20SitRep%20No.%202%20for%20Tropical%20Storm%20KABAYAN%20%28Muifa%29.pdf |archive-date=October 7, 2011 }} Due to the southwest monsoon enhanced by Muifa, it caused heavy rains in several parts of Luzon including Metro Manila. Early on August 2, Malacañang Palace suspended government offices and pre-school to college level in NCR.{{cite web|url=http://www.gmanews.tv/story/228113/nation/palace-suspends-college-classes-govt-work-in-ncr |title=Palace suspends college classes, govt work in NCR |publisher=GMA News |date=2011-08-02 |access-date=2013-12-20}} Nearby provinces like Calabarzon (Region IV-A) also suspended their classes. In Marikina, 200 residents or 31 families living in communities along the Marikina River sought shelter in evacuation centers.{{cite web|url=http://www.gmanews.tv/story/228119/nation/marikina-residents-start-to-flee-as-alert-level-2-sounded |title=Marikina residents start to flee as Alert Level 2 sounded |publisher=GMA News |date=2011-08-02 |access-date=2013-12-20}}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter =

| Image = Lando_Jul_31_2011_0245Z.jpg

| Formed = July 31

| Dissipated = August 2

| Track = Lando 2011 track.png

| Pressure = 1002

| 10-min winds = 25

| 1-min winds =

}}

On July 31, the JMA reported that a tropical depression had developed about {{convert|500|km|mi|abbr=on}} to the north west of Manila in the Philippines.{{cite web|url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |url-status=dead |archive-date=May 2, 2001 |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-07-31 06z |access-date=December 27, 2011 |publisher=Japan Meteorological Agency }} However, because of the outflow from Typhoon Mufia, the deep convection that surrounded the system was being sheared off to the west of the systems low level circulation center.{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=May 23, 2024 |archive-url=https://archive.today/20240523161503/https://www.webcitation.org/64FXs5vHq?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1107e&L=wx-tropl&D=0&T=0&X=558D791777B97BA4EA&P=36017 |title=Significant Tropical Weather Advisory for the Western and Southern Pacific Ocean 2011-07-31 |access-date=December 27, 2011 |author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |url-status=dead }} During that day the depression moved towards the north slowly, before PAGASA named it as Lando, however during the next day they reported that the depression had weakened into a low-pressure area and released their final advisory on it.{{cite web |url=http://www.pagasa.dost.gov.ph/wb/tcarchive_lando_files.html |archive-date=August 5, 2012 |archive-url=https://archive.today/20120805093504/http://www.pagasa.dost.gov.ph/wb/tcarchive_lando_files.html |title=Severe Weather Bulletin number one, Tropical Cyclone Alert: Tropical Depression "Lando" issued at 6.30 pm, 2011-07-31 |access-date=December 27, 2011 |date=July 31, 2011 |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |url-status=dead }}{{cite web |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |url=http://www.pagasa.dost.gov.ph/wb/tcarchive_lando_files.html |archive-date=August 5, 2012 |archive-url=https://archive.today/20120805093504/http://www.pagasa.dost.gov.ph/wb/tcarchive_lando_files.html |date=July 31, 2011 |access-date=December 27, 2011 |title=Severe Weather Bulletin number four (final), Tropical Cyclone Alert: Tropical Depression "Lando" issued at 5.00 pm, 31 July 2011 |url-status=dead }} After PAGASA issued their final advisory, the JMA continued to monitor the depression for another 24 hours before late on August 2, the JMA dropped the system from their advisories as it dissipated.{{cite web|publisher=Japan Meteorological Agency |title=JMA WWJP25 Warning and Summary 2011-07-31 12z |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |date=July 31, 2011 |access-date=December 27, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }}{{cite web|url=https://listserv.illinois.edu/wa.cgi?A2%3Dind1108a%26L%3Dwx-tropl%26T%3D0%26X%3D558D791777B97BA4EA%26P%3D25538 |archive-url=https://archive.today/20240523161420/https://www.webcitation.org/64FcmbyTb?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1108a&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=25538 |url-status=dead |archive-date=May 23, 2024 |title=JMA WWJP25 Warning and Summary 2011-08-02 18z |date=August 2, 2011 |publisher=Japan Meteorological Agency |access-date=December 27, 2011 }}{{cite web|title=Significant Tropical Weather Advisory for the Western and Southern Pacific Ocean 2011-08-02 21z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |author=Joint Typhoon Warning Center |archive-date=August 5, 2012 |archive-url=https://archive.today/20120805220548/https://listserv.illinois.edu/wa.cgi?A2=ind1108a&L=wx-tropl&D=0&T=0&X=558D791777B97BA4EA&P=27409 |date=August 2, 2011 |publisher=United States Navy, United States Air Force |access-date=December 27, 2011 |url-status=dead }}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = August 2

| Dissipated = August 9

| Image = Typhoon Merbok Aug 8 2011.jpg

| Track = Merbok 2011 track.png

| 10-min winds = 50

| 1-min winds = 75

| Pressure = 980

}}

Early on August 2, the JMA upgraded an area of low pressure near Wake Island to a tropical depression.{{cite web|title=JMA — Tropical Cyclone Advisory 030000 – Tropical depression 18 |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108030000.htm |publisher=Japan Meteorological Agency |access-date=August 3, 2011 |url-status=dead |archive-url=https://archive.today/20240523160014/https://www.webcitation.org/60f2UPgKs?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108030000.htm |archive-date=May 23, 2024 }} The system intensified rapidly and just six hours later, the JMA upgraded the system to a tropical storm, naming it Merbok.{{cite web|title=JMA — Tropical Cyclone Advisory 030600 – Tropical Storm Merbok |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108030600.htm |publisher=Japan Meteorological Agency |access-date=August 3, 2011 |url-status=dead |archive-url=https://archive.today/20240523155940/https://www.webcitation.org/60f2c55BV?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108030600.htm |archive-date=May 23, 2024 }} Soon, the JTWC started monitoring the system as a tropical depression and upgraded it to a tropical storm later.{{cite web|title=JTWC — Tropical Cyclone Warning 01 – Tropical Depression Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 3, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Merbok began to move westward slowly, but soon afterwards, it turned northwest and gradually drifted in that direction. Late on August 5, the JMA upgraded Merbok into a severe tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 051800 – Severe Tropical Storm Merbok |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108051800.htm |publisher=Japan Meteorological Agency |access-date=August 6, 2011 |url-status=dead |archive-url=https://archive.today/20240523160054/https://www.webcitation.org/60ifx7UgA?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108051800.htm |archive-date=May 23, 2024 }} Early on August 6, the JTWC upgraded Merbok into a Category 1 typhoon {{convert|960|mi|km|abbr=on}} east-southeast of Tokyo, Japan.{{cite web|title=JTWC — Tropical Cyclone Warning 13 – Typhoon Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 6, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Early the next day, the storm's winds reached a peak of {{convert|90|mph|km/h|abbr=on}} (1-min sustained).{{cite web|title=JTWC — Tropical Cyclone Warning 16 – Typhoon Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 7, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Later that day, the system was caught in moderate vertical wind shear and started weakening.{{cite web|title=JTWC — Tropical Cyclone Warning 17 – Typhoon Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 7, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} On August 8, the system started accelerating northwards at a speed of {{convert|23|mph|km/h|abbr=on}} and convection gradually diminished due to colder sea surface temperatures and unfavorable conditions.{{cite web|title=JTWC — Tropical Cyclone Warning 21 – Tropical Storm Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 8, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} As a result, the JMA reported that Merbok had weakened into a tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 081800 – Tropical Storm Merbok |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108081800.htm |publisher=Japan Meteorological Agency |access-date=August 9, 2011 |url-status=dead |archive-url=https://archive.today/20240523160139/https://www.webcitation.org/60o3ULASC?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108081800.htm |archive-date=May 23, 2024 }} Later on that day, the system started showing extratropical characteristics as the convection near the eye dissipated rapidly. Thus, the JTWC issued their final warning on the system reporting that the system was no longer tropical.{{cite web|title=JTWC — Final Warning — Extratropical Storm Merbok |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 9, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Later, the JMA, also noting that Merbok had lost its tropical characteristics, issued their final advisory.{{cite web|title=JMA — Tropical Cyclone Advisory 091800 – Extratropical storm merbok|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=August 10, 2011}}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter = JMA

| Image = TD 13W 8-10-2011.jpg

| Formed = August 8

| Dissipated = August 14

| Track = 13W 2011 track.png

| Pressure = 1002

| 10-min winds = 30

| 1-min winds = 30

}}

A tropical depression gradually drifted north and early on August 10, the JTWC started monitoring the system as a tropical depression and designated it 13W.{{cite web|title=JTWC — Tropical Cyclone Warning 01 – Tropical Depression 13W |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 10, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Initially, the JMA predicted the system to strengthen into a tropical storm, but on August 11, as it moved further north into cool waters and unfavourable conditions, the JMA issued their final advisory.{{cite web|author=Staff Writer|title=JMA — Tropical Cyclone Advisory 112100 (Final) – Tropical Depression 20|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|work=JMA Tropical Cyclone Advisories|publisher=Japan Meteorological Agency|access-date=August 12, 2011}} Later, the JTWC too issued their final warning on the system, reporting that it had moved into a subtropical ridge and was expected to dissipate into a remnant low.{{cite web|author=Joint Typhoon Warning Center |title=JTWC — Tropical Cyclone Adivosry 09 (Final) – Tropical Depression 13W |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |work=JTWC Tropical Cyclone Advisories |access-date=August 12, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} However, the JMA continued to track the remnants as a weak tropical depression over the next few days until the system dissipated on August 15.

{{clear}}

{{main|Typhoon Nanmadol (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = August 21

| Dissipated = August 31

| Image = Nanmadol Aug 26 2011 0450Z.jpg

| Track = Nanmadol 2011 track.png

| 10-min winds = 100

| 1-min winds = 140

| Pressure = 925

}}

Late on August 19, an area of low pressure developed north of Palau.{{cite web|title=JTWC Tropical Cyclone Warning 192100 – Tropical Depression 23 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108192100.htm |author=Joint Typhoon Warning Center |access-date=August 22, 2011 |url-status=dead |archive-url=https://archive.today/20240523104540/https://www.webcitation.org/61523IHCv?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108192100.htm |archive-date=May 23, 2024 }} Early on August 20, the system became better organized and developed a low-level circulation center (LLCC).{{cite web|title=Tropical Depression 23 – Low Level Circulation Center |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108200100.htm |author=Joint Typhoon Warning Center |access-date=August 22, 2011 |url-status=dead |archive-url=https://archive.today/20240523104449/https://www.webcitation.org/6151uraG4?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108200100.htm |archive-date=May 23, 2024 }} The system then turned north and continued to drift north until August 21, when the JMA upgraded the low-pressure area to a tropical depression east of Philippines.{{cite web|title=JMA — Tropical Cyclone Advisory 211200 – Tropical Depression 23 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 21, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }} The JTWC also issued a Tropical Cyclone Formation Alert (TCFA), reporting that the system was becoming better organized.{{cite web|title=JTWC TCFA 01 on Tropical Depression 23 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 22, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20010430145016/http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |archive-date=April 30, 2001 }} Later that day, the PAGASA started monitoring the system as a tropical depression and named it Mina.{{cite web|title=PAGASA -Severe Weather Bulletin Number ONE — Tropical Cyclone Alert: Tropical Depression "MINA" |url=http://dynasmon.fortunecity.com/PAGASA.html |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |access-date=August 22, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20090726132915/http://dynasmon.fortunecity.com/PAGASA.html |archive-date=July 26, 2009 }} Late on August 22, the system became more well organized prompting the JTWC to initiate advisories on the system, designating it 14W.{{cite web|title=JTWC — Tropical Cyclone Warning 01 – Tropical Depression 14W |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201108222100.htm |author=Joint Typhoon Warning Center |access-date=August 23, 2011 |url-status=dead |archive-url=https://archive.today/20240523104612/https://www.webcitation.org/619JaMLGU?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201108222100.htm |archive-date=May 23, 2024 }} On August 23, the JMA upgraded 14W to a tropical storm, naming it Nanmadol.{{cite web|title=JMA — Tropical Cyclone Advisory 231200 – Tropical Storm Nanmadol |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108231200.htm |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 23, 2011 |url-status=dead |archive-url=https://archive.today/20240522172915/https://www.webcitation.org/619j68tUp?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108231200.htm |archive-date=May 22, 2024 }} Overnight, the system continued to intensify and early on August 24, the JMA upgraded Nanmadol to a severe tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 240600 – Severe Tropical Storm Nanmadol|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|work=JMA Tropical Cyclone Advisories|publisher=Japan Meteorological Agency|access-date=August 24, 2011}} Later that day, convective banding improved and Nanmadol developed an eye-like feature.{{cite web|title=JTWC — Tropical Cyclone Advisory 07 – Tropical Storm Nanmadol |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 24, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} As a result, Nanmadol continued to intensify rapidly and became a typhoon, by midnight.{{cite web|title=JMA — Tropical Cyclone Advisory 250000 – Typhoon Nanmadol |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108250000.htm |publisher=Japan Meteorological Agency |access-date=August 25, 2011 |url-status=dead |archive-url=https://archive.today/20240523104651/https://www.webcitation.org/61CE5dEkt?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108250000.htm |archive-date=May 23, 2024 }} Nanmadol continued to drift north east and made landfall over Gonzaga, Cagayan, Philippines with strong winds of over {{convert|110|mph|km/h|abbr=on}}.{{cite web|title=JMA — Tropical Cyclone Advisory 270300 – Typhoon Nanmadol|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|work=JMA Tropical Cyclone Advisories|publisher=Japan Meteorological Agency|access-date=August 27, 2011}} Nanmadol weakened significantly after interacting with land and early on August 28, the JMA downgraded Nanmadol to a severe tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 280000 – Severe Tropical Storm Nanmadol |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108280000.htm |publisher=Japan Meteorological Agency |access-date=August 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523104931/https://www.webcitation.org/61GjSiPCT?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201108280000.htm |archive-date=May 23, 2024 }} Late on August 28, Nanmadol made its second landfall over Taimali in the Taitung County of Taiwan and started weakening.{{citation |title=JTWC — Tropical Cyclone Advisory 25 – Typhoon Nanmadol|author=Joint Typhoon Warning Center }} Landfall weakened the system rapidly prompting the JMA to downgrade Nanmadol to a tropical storm with winds of under {{convert|50|mph|km/h|abbr=on}}.{{citation |title=JMA — Tropical Cyclone Advisory 291200 – Tropical Storm Nanmadol|publisher=Japan Meteorological Agency }} Soon, it started experiencing strong wind shear and continued weakening. The shear pushed convection approximately {{convert|70|km|mi|abbr=on}} south of the LLCC. The system also accelerated towards China at {{convert|8|kn}} and weakened to a minimal tropical storm.{{citation |title=JTWC — Tropical Cyclone Advisory 31 – Tropical Storm Nanmadol|author=Joint Typhoon Warning Center }} After its third landfall over Fujian, Nanmadol weakened rapidly prompting both the JTWC and the JMA to issue their final warnings on the system.{{citation |title=JMA — Tropical Cyclone Advisory 310600 – TD Downgraded From TS 1111 Nanmadol (1111)|work=JMA Tropical Cyclone Advisories|publisher=Japan Meteorological Agency }}{{citation |title=Tropical Depression 14W (Nanmadol) Warning No. 34 Final Warning|author=Joint Typhoon Warning Center }}

On August 27, five people died after Nanmadol caused landslides.{{cite news|title=Typhoon-triggered landslide kills five people in Philippines|url=https://www.theglobeandmail.com/news/world/asia-pacific/typhoon-triggered-landslide-kills-five-children-in-philippines/article2144568/|work=GLOBE AND MAIL|location=Canada|access-date=August 28, 2011}}{{Dead link|date=December 2021 |bot=InternetArchiveBot |fix-attempted=yes }} At least two Filipino fishermen were reported to be missing after Nanmadol's strong winds whipped up large waves.{{cite web|title=Two fishermen missing as Philippines braces for Typhoon Nanmadol — Monsters and Critics |url=http://www.monstersandcritics.com/news/asiapacific/news/article_1659254.php/Two-fishermen-missing-as-Philippines-braces-for-Typhoon-Nanmadol |archive-url=https://archive.today/20120604020243/http://www.monstersandcritics.com/news/asiapacific/news/article_1659254.php/Two-fishermen-missing-as-Philippines-braces-for-Typhoon-Nanmadol |url-status=dead |archive-date=June 4, 2012 |publisher=m&c news |access-date=August 26, 2011 }} In September 2011, the JTWC upgraded Nanmadol to a Category 5 super typhoon in post-analysis.

{{clear}}

{{main|Tropical Storm Talas (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = August 23

| Dissipated = September 5

| Image = Talas 2011-09-01.jpg

| Track = Talas 2011 track.png

| 10-min winds = 50

| 1-min winds = 55

| Pressure = 970

}}

Late on August 21, a low-pressure area developed to the west of Guam, which is associated from the remnants of a tropical depression.{{cite web|title=JTWC — Tropical Cyclone Outlook 222300 – Tropical Depression 24 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108222300.htm |author=Joint Typhoon Warning Center |access-date=August 23, 2011 |url-status=dead |archive-url=https://www.webcitation.org/619KTqPOj?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108222300.htm |archive-date=August 23, 2011 }} At midnight that day, the system became sufficiently well organized that the JMA started tracking it as a tropical depression. On August 23, the system moved into an environment of low wind shear and warm sea surface temperatures prompting the JTWC to issue a TCFA on it.{{cite web|title=JTWC — Tropical Cyclone Formation Alert — Tropical Depression 24 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 24, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20010430145016/http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |archive-date=April 30, 2001 }} By August 25, the system grew strong enough that the JMA upgraded it to a tropical storm, naming it Talas.{{cite web|title=JMA — Tropical Cyclone Advisory 250000 – Tropical Storm Talas |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201108250000.htm |publisher=Japan Meteorological Agency |access-date=August 25, 2011 |url-status=dead |archive-url=https://archive.today/20240523014150/https://www.webcitation.org/61CEsVEBr?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201108250000.htm |archive-date=May 23, 2024 }} Later that day, the JTWC followed suit and initiated advisories on Talas.{{cite web|title=JTWC — Tropical Cyclone Advisory 01 – Tropical Storm Talas |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 25, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |archive-date=April 30, 2001 }} Talas continued to strengthen and by midnight that day, it became a severe tropical storm.{{cite web|title=JMA — Tropical Cyclone Advisory 260000 – Severe Tropical Storm Talas |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201108260000.htm |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 26, 2011 |url-status=dead |archive-url=https://archive.today/20240523160435/https://www.webcitation.org/61DtxehZX?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201108260000.htm |archive-date=May 23, 2024 }} Over the next few days, Talas continued to drift north very slowly until late on August 29, when the JMA upgraded Talas to a typhoon.{{citation |title=JMA — Tropical Cyclone Advisory 291800 – Typhoon Talas|publisher=Japan Meteorological Agency }} Soon, a subtropical ridge to the west of the storm weakened and the subtropical ridge to the east of the system pushed Talas to the west. As a result, Talas accelerated towards the west maintaining strength and outflow.{{citation |title=JTWC — Tropical Cyclone Advisory 25 – Tropical Storm Talas|author=Joint Typhoon Warning Center }} An upper-level cyclone over the system suppressed the convection and kept it from reaching the center. Therefore, Talas remained weak and did not strengthen further. Convection never managed to consolidate the center and convective banding remained well away from the fully exposed low-level circulation center.{{citation |title=JTWC — Tropical Cyclone Advisory 27 – Tropical Storm Talas|author=Joint Typhoon Warning Center }} The convective banding continued to expand more and more with the outer rainbands already brushing parts of Japan. Coastal areas in the nation have already reported gale-force winds several hours before landfall, while the Omega block continued to drive Talas towards the nation.{{cite web|title=JTWC — Prognostic Reasoning for Tropical Cyclone Advisory 32 – Tropical Storm Talas|url=http://vizagbom.blogspot.com/2011/09/jtwc-prognostic-reasoning-for-tropical.html|author=Joint Typhoon Warning Center|access-date=September 2, 2011|date=2011-09-02}} Land interaction weakened Talas, prompting the JMA to downgrade Talas from a typhoon to a severe tropical storm with winds of under {{convert|60|kn}}.{{cite web|title=JMA — Tropical Cyclone Advisory 020600 – Severe Tropical Storm Talas|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-advisory-020600.html|publisher=Japan Meteorological Agency|access-date=September 2, 2011|date=2011-09-02}} Early on September 3, Talas made landfall over Aki, Japan.{{cite web|title=台風１２号 高知県に上陸へ |url=http://www3.nhk.or.jp/news/html/20110903/t10015345651000.html |publisher=NHK |access-date=September 3, 2011 }}{{dead link|date=September 2016 |bot=InternetArchiveBot |fix-attempted=yes }} After landfall, Talas accelerated north at over {{convert|13|kn}} and its central convection became significantly eroded and was displaced to the north-east as Talas was exposed to a very strong wind shear of over {{convert|50|kn}} that made the LLCC very distorted and difficult to pin-point. Talas was embedded in a baroclinic zone and the JTWC anticipated an extratropical transition, which prompted them to issue their final warning on the system.{{cite web|title=JTWC — Tropical Cyclone Advisory 40 – Tropical Storm Talas|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-40.html|author=Joint Typhoon Warning Center|access-date=September 4, 2011|date=2011-09-04}} On September 5, the JMA issued their final warning on the system, reporting that Talas has become extratropical on the Sea of Japan.{{cite web|title=台風１２号が温帯低気圧に |url=http://www3.nhk.or.jp/news/html/20110905/t10015388481000.html |publisher=NHK |access-date=September 5, 2011 }}{{dead link|date=September 2016 |bot=InternetArchiveBot |fix-attempted=yes }}{{cite web|title=JMA — Tropical Cyclone Advisory 050600 – Ex-Tropical Storm Talas|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-advisory-050600-ex.html|publisher=Japan Meteorological Agency|access-date=September 5, 2011|date=2011-09-05}}

In October 2011, the JMA upgraded Talas as a typhoon in post-analysis. But during 2014, the JMA downgraded Talas again to a severe tropical storm on another post-analysis.

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 2

| Dissipated = September 6

| Image = Noru 2011-09-04 0310Z.jpg

| Track = Noru 2011 track.png

| 10-min winds = 40

| 1-min winds = 45

| Pressure = 990

}}

During September 1, the JTWC reported that a tropical disturbance had developed within the outflow of Tropical Storm Talas, about {{convert|980|km|mi|abbr=on}} to the northeast of Hagåtña, Guam.{{cite web|author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force |archive-url=https://archive.today/20240522173434/https://www.webcitation.org/64MMjLJ9e?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1109a&L=wx-tropl&D=0&T=0&X=558D791777B97BA4EA&P=5025 |access-date=March 10, 2012 |title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-09-01 15z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=May 22, 2024 |url-status=dead }} Deep convection surrounded the systems low-level circulation but it was not organising as it was impacted, by a moderate to strong amount of vertical wind shear, which was produced by Talas' outflow and a TUTT cell to the northeast of the system. However, during that day vertical wind shear surrounding the system relaxed and the system started to consolidate, while it moved towards the north-northwest around a subtropical ridge of high pressure.{{cite web|publisher=United States Navy, United States Air Force |archive-url=https://archive.today/20240523161541/https://www.webcitation.org/64MNQkz1y?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1109a&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=12797 |author=Joint Typhoon Warning Center |access-date=March 10, 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=May 23, 2024 |title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-09-02 06z |url-status=dead }} Early the next day, because the system continued to consolidate the JTWC issued a Tropical Cyclone Formation Alert, while the JMA reported that the system had become a tropical depression.{{cite web|url=https://listserv.illinois.edu/wa.cgi?A2%3Dind1109a%26L%3Dwx-tropl%26T%3D0%26X%3D558D791777B97BA4EA%26P%3D15405 |archive-url=https://archive.today/20240522173514/https://www.webcitation.org/64MNgaX8Y?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1109a&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=15405 |url-status=dead |archive-date=May 22, 2024 |title=Tropical Cyclone Formation Alert 2011-09-02 10z |date=September 2, 2011 |author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force, United States Air Force |access-date=January 1, 2012 }}{{cite web|author=RSMC Tokyo — Typhoon Center |url=http://weather.noaa.gov/pub/data/raw/ax/axpq20.rjtd..txt |title=Tropical Cyclone Best Track Analysis: Tropical Storm Noru 2011 |date=October 26, 2011 |publisher=Japan Meteorological Agency |access-date=January 1, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20071024084420/http://weather.noaa.gov/pub/data/raw/ax/axpq20.rjtd..txt |archive-date=October 24, 2007 }} Over the next 24 hours, the system continued to consolidate as it moved towards the north-northwest before the JTWC initiated advisories on the system as it intensified into Tropical Storm 16W, however the JMA did not name it as Noru until 06:00 UTC on September 4. As it was named, the JTWC reported that Noru had peaked with 1-minute windspeeds of {{convert|85|km/h|mph|abbr=on|round=5}}, while the JMA reported peak 10-minute sustained wind speeds of {{convert|75|km/h|mph|abbr=on|round=5}}. On September 5, after it had peaked in intensity, a fresh Tutt cell developed over the system and started to inhibit outflow and shear the convection away, which meant as a result that the system started to weaken. Over the next two days, Noru went through an extratropical transition before becoming an extratropical cyclone on September 6, about {{convert|1150|km|mi|abbr=on}} to the northeast of Tokyo, Japan. As an extratropical cyclone, Noru continued its movement towards the north-northwest and affected Sakhalin and the Kuril Islands, before it moved over Okhotsk on September 9, and dissipated.

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 6

| Dissipated = September 11

| Image = Kulap 2011-09-07 0210Z.jpg

| Track = Kulap 2011 track.png

| 10-min winds = 35

| 1-min winds = 40

| Pressure = 1000

}}

Late on September 4, an area of low pressure developed to the southeast of Okinawa, Japan.{{cite web|title=JTWC — Tropical Cyclone Warning 042200 – Tropical Depression 26|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-warning-042200.html|author=Joint Typhoon Warning Center|access-date=September 6, 2011|date=2011-09-06}} Over the next two days, the system drifted north and developed a well defined LLCC with organized convective banding, prompting the JMA to upgrade the low-pressure area to a tropical depression.{{cite web|title=JMA — Tropical Cyclone Warning 060600 – Tropical Depression 26|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-warning-060600.html|publisher=Japan Meteorological Agency|access-date=September 6, 2011|date=2011-09-06}} On September 7, convection consolidated the low-level circulation center very well with tightly curved banding wrapped into it. Also, high sea-surface temperatures and very low wind shear caused the system to undergo rapid deepening,{{cite web|title=JTWC — Tropical Cyclone Advisory 01 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-01_07.html|author=Joint Typhoon Warning Center|access-date=September 7, 2011|date=2011-09-07}} prior to which, the JMA upgraded the system to a tropical storm and named it Kulap.{{cite web|title=JMA — Tropical Cyclone Advisory 70300 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-advisory-70300.html|publisher=Japan Meteorological Agency|access-date=September 7, 2011|date=2011-09-07}} However, the system stopped strengthening soon after as the LLCC became partially exposed and the convection was displaced to the south. Kulap remained small in size and dry air entering from the western periphery kept it from strengthening further.{{cite web|title=JTWC — Tropical Cyclone Advisory 03 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-03_08.html|author=Joint Typhoon Warning Center|access-date=September 8, 2011|date=2011-09-08}} Wind shear increased, pushing convection approximately {{convert|180|nmi}} south of the LLCC. Also, Kulap was located beneath a tropical upper tropospheric trough (TUTT cell) that caused subsidence. A mid-level subtropical steering ridge caused Kulap to track in a northwestward direction.{{cite web|title=JTWC — Tropical Cyclone Advisory 05 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-05.html|author=Joint Typhoon Warning Center|access-date=September 8, 2011|date=2011-09-08}} On September 8, Kulap moved into the east-northeast periphery of the Philippine Area of Responsibility (PAR) prompting the PAGASA to start issuing advisories on the system, naming it Nonoy.{{cite web|title=PAGASA — Severe Weather Bulletin Number ONE — Tropical Storm "NONOY" (KULAP)|url=http://vizagbom.blogspot.com/2011/09/pagasa-severe-weather-bulletin-number.html|publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration|access-date=September 8, 2011|date=2011-09-08}} However, Kulap quickly accelerated north and exited the PAR on the same evening, prompting the PAGASA to issued their final advisory on the system.{{cite web|title=PAGASA — Severe Weather Bulletin Number TWO (FINAL) – Tropical Storm "NONOY" (KULAP)|url=http://vizagbom.blogspot.com/2011/09/pagasa-severe-weather-bulletin-number_08.html|publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration|access-date=September 8, 2011|date=2011-09-08}} After increasing wind shear caused further weakening, the JTWC downgraded Kulap to a tropical depression late on September 8,.{{cite web|title=JTWC — Tropical Cyclone Advisory 07 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-07_09.html|author=Joint Typhoon Warning Center|access-date=September 9, 2011|date=2011-09-09}} Early on September 10, the JMA too downgraded Kulap to a tropical depression,{{cite web|title=JMA — Tropical Cyclone Advisory 100000 – Tropical Storm Kulap|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-advisory-100000.html|publisher=Japan Meteorological Agency|access-date=September 10, 2011|date=2011-09-10}} and continued to track Kulap's remnants as a tropical depression until it was finally absorbed by the weather front early on September 11.

{{clear}}

{{main|Typhoon Roke (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 9

| Dissipated = September 22

| Image = 2011 Roke.jpg

| Track = Roke 2011 track.png

| 10-min winds = 85

| 1-min winds = 115

| Pressure = 940

}}

Early on September 8, a cluster of thunderstorms came together as a low-pressure area with improving outflow and a developing low-level circulation center (LLCC).{{cite web|title=JTWC — Tropical Cyclone Warning 080130 – Tropical Depression|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-warning-080130.html|author=Joint Typhoon Warning Center|access-date=September 9, 2011|date=2011-09-09}} Later that day, the JMA upgraded the low-pressure area to a tropical depression north-northeast of the Northern Mariana Islands.{{cite web|title=JMA — Tropical Cyclone Warning 081800 – Tropical Depression 27|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-warning-081800.html|publisher=Japan Meteorological Agency|access-date=September 9, 2011|date=2011-09-09}} Over the next two days, the system gradually drifted west and intensified slightly, prompting the JTWC to issue a Tropical Cyclone Formation Alert (TCFA) on it.{{cite web|title=JTWC — Tropical Cyclone Formation Alert — Tropical Depression 27|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-formation-alert_11.html|author=Joint Typhoon Warning Center|access-date=September 11, 2011|date=2011-09-11}} Convection gradually consolidated the LLCC and the JTWC initiated advisories on the system on September 11, designating it with 18W.{{cite web|title=JTWC — Tropical Cyclone Advisory 01 – Tropical Depression 18W|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-01_11.html|author=Joint Typhoon Warning Center|access-date=September 11, 2011|date=2011-09-11}} The next day, the depression drifted into the Philippine Area of Responsibility (PAR) and the PAGASA initiated advisories on the depression, naming it Onyok.{{cite web|title=PAGASA — Severe Weather Bulletin Number ONE — Tropical Depression "ONYOK" |url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109121200.htm |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |access-date=September 13, 2011 |url-status=dead |archive-url=https://archive.today/20240523124704/https://www.webcitation.org/61fF7WWL3?url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109121200.htm |archive-date=May 23, 2024 }} However, just as similar to Kulap, Onyok also exited the PAR in 6 hours from entering the region.{{cite web|title=PAGASA — Severe Weather Bulletin Number TWO(FINAL) – Tropical Depression "ONYOK" |url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109130300.htm |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |access-date=September 13, 2011 |url-status=dead |archive-url=https://archive.today/20240523124741/https://www.webcitation.org/61fFXGTRR?url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109130300.htm |archive-date=May 23, 2024 }} In an advisory, the JTWC reported that there were at least two more vortices associated with the system, that caused an abrupt, erratic movement.{{cite web|title=JTWC — Tropical Cyclone Advisory 08 – Tropical Storm Roke |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=September 13, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} However, being located in an area of warm sea surface temperatures and low vertical wind shear, the depression continued to strengthen and on September 13, the JMA upgraded the depression to a tropical storm and named it Roke.{{cite web|title=JMA — Tropical Cyclone Advisory 131200 – Tropical Storm Roke |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |publisher=Japan Meteorological Agency |access-date=September 13, 2011 |url-status=live |archive-url=https://web.archive.org/web/20081014125540/http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-date=October 14, 2008 }} On September 17, Roke developed a small, deep convective eye promoting the JMA to upgrade Roke to a severe tropical storm with winds of over {{convert|50|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 26 – Tropical Storm Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109172100.htm |author=Joint Typhoon Warning Center |access-date=September 18, 2011 |url-status=dead |archive-url=https://archive.today/20240523125103/https://www.webcitation.org/61mnwjXHz?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109172100.htm |archive-date=May 23, 2024 }} Between September 19 and 20, Roke underwent explosive intensification, a more extreme case of rapid deepening that involves a tropical cyclone deepening at a rate of at least 2.5 mbar per hour for a minimum of 12 hours. Also, they added that Roke developed a {{convert|10|nmi}} eye and a good poleward outflow channel.{{cite web|title=JTWC — Tropical Cyclone Advisory 34 – Typhoon Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109192100.htm |author=Joint Typhoon Warning Center |access-date=September 20, 2011 |url-status=dead |archive-url=https://archive.today/20240523125427/https://www.webcitation.org/61pr6Jnws?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109192100.htm |archive-date=May 23, 2024 }} On September 21, Typhoon Roke made landfall over Hamamatsu, Japan at about 05:00 UTC (14:00 JST).{{cite web|title=台風 浜松市付近に上陸し東進 |url=http://www3.nhk.or.jp/news/html/20110921/t10015741001000.html |publisher=NHK |access-date=September 21, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110923215204/http://www3.nhk.or.jp/news/html/20110921/t10015741001000.html |archive-date=September 23, 2011 }} Soon Roke started weakening as cloud tops started getting warmed up and eye diameter started to decrease. However, the system still maintained a near radial outflow and the convective structure continued to remain organized that kept Roke from dissipating rapidly.{{cite web|title=JTWC — Tropical Cyclone Advisory 36 – Typhoon Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109200900.htm |author=Joint Typhoon Warning Center |access-date=September 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523125522/https://www.webcitation.org/61rG722t4?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109200900.htm |archive-date=May 23, 2024 }} Although Roke entered a de-intensification phase, it still had plenty of strength that posed a great threat to regions of Japan. Being located approximately {{convert|330|nmi}} southwest of Yokosuka, the typhoon accelerated north-northwestward at approximately {{convert|16|kn}} with winds of over {{convert|100|kn}} (1-min sustained) being a Category 3 typhoon on the SSHS.{{cite web|title=JTWC — Tropical Cyclone Advisory 38 – Typhoon Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109202100.htm |author=Joint Typhoon Warning Center |access-date=September 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523125555/https://www.webcitation.org/61rGNc28H?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109202100.htm |archive-date=May 23, 2024 }} Being embedded in the baroclinic zone, Roke started its extratropical transition. Also, land interaction severely weakened the storm to a minimal Category 1 typhoon with winds of under {{convert|70|kn}} (1-min sustained).{{cite web|title=JTWC — Tropical Cyclone Advisory 40 – Typhoon Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109210900.htm |author=Joint Typhoon Warning Center |access-date=September 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523125631/https://www.webcitation.org/61rqwpqZc?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109210900.htm |archive-date=May 23, 2024 }} Only six hours later, the storm further weakened and accelerated northeastward at approximately {{convert|31|kn}} with rapidly dissipating deep convection completely sheared to the northeast of the LLCC. As a result, the JTWC ceased advisories on the storm, as it became fully extratropical.{{cite web|title=JTWC — Tropical Cyclone Advisory 41 – Tropical Storm Roke |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109211500.htm |author=Joint Typhoon Warning Center |access-date=September 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523125708/https://www.webcitation.org/61rr7FsZT?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109211500.htm |archive-date=May 23, 2024 }}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 14

| Dissipated = September 20

| Image = Sonca Sept 19 2011.jpg

| Track = Sonca 2011 track.png

| 10-min winds = 70

| 1-min winds = 90

| Pressure = 970

}}

Early on September 13, a low-pressure area formed northeast of the Northern Mariana Islands.{{cite web|title=JTWC — Tropical Cyclone Warning 130000 – Tropical Depression 28 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201109130000.htm |author=Joint Typhoon Warning Center |access-date=September 14, 2011 |url-status=dead |archive-url=https://archive.today/20240523160455/https://www.webcitation.org/61gVldD1Y?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201109130000.htm |archive-date=May 23, 2024 }} The system gradually drifted north and steadily intensified until the next day when the JMA upgraded the system to a tropical depression.{{cite web|title=JMA — Tropical Cyclone Warning 140000 – Tropical Depressions 28 & 29 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency |access-date=September 14, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }} Later on September 14, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the system reporting that the system could intensify into a tropical storm within 24 hours from then.{{cite web|title=JTWC — Tropical Cyclone Formation Alert — Tropical Depression 28 |url=http://gwydir.demon.co.uk/advisories/WTPN22-PGTW_201109141430.htm |author=Joint Typhoon Warning Center |access-date=September 15, 2011 |url-status=dead |archive-url=https://archive.today/20240523160538/https://www.webcitation.org/61i2gLbLj?url=http://gwydir.demon.co.uk/advisories/WTPN22-PGTW_201109141430.htm |archive-date=May 23, 2024 }} Convection rapidly consolidated the center with persistent, deep convection around the north-eastern periphery, prompting the JTWC to initiate advisories on the system, designating it with 19W.{{cite web|title=JTWC — Tropical Cyclone Advisory 01 – Tropical Depression 19W |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109142100.htm |author=Joint Typhoon Warning Center |access-date=September 15, 2011 |url-status=dead |archive-url=https://archive.today/20240523160707/https://www.webcitation.org/61iWxzI3K?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109142100.htm |archive-date=May 23, 2024 }} Soon, the JMA also initiated advisories on the system, upgrading it to Tropical Storm Sonca.{{cite web|title=JMA — Tropical Cyclone Advisory 150600 – Tropical Storm Sonca|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=September 15, 2011}} In the begging, Sonca seemed to have intensified rapidly since formation, however, soon the storm weakened back to a minimal tropical storm because of dry air entering the LLCC that caused it to elongate and weaken.{{cite web|title=JTWC — Tropical Cyclone Advisory 04 – Tropical Storm Sonca |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp1911prog.txt |author=Joint Typhoon Warning Center |access-date=September 15, 2011 |url-status=dead |archive-url=https://archive.today/20240523160617/https://www.webcitation.org/61ijYtomE?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp1911prog.txt |archive-date=May 23, 2024 }} However, that was not for too long as vigorous convection persisted over the well defined LLCC with tightly curved banding wrapped in, Sonca continued to strengthen gradually and the JTWC reported winds of at least {{convert|50|kn}} near the center.{{cite web|title=JTWC — Tropical Cyclone Advisory 08 – Tropical Storm Sonca |url=http://gwydir.demon.co.uk/advisories/WDPN32-PGTW_201109161500.htm |author=Joint Typhoon Warning Center |access-date=September 17, 2011 |url-status=dead |archive-url=https://archive.today/20240523160738/https://www.webcitation.org/61l4rFxTs?url=http://gwydir.demon.co.uk/advisories/WDPN32-PGTW_201109161500.htm |archive-date=May 23, 2024 }} As Sonca continued to strengthen, and the JMA upgraded it to a severe tropical storm on September 17,.{{cite web|title=JMA — Tropical Cyclone Advisory 170600 – Tropical Storm Sonca |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109170600.htm |publisher=Japan Meteorological Agency |access-date=September 17, 2011 |url-status=dead |archive-url=https://archive.today/20240523160824/https://www.webcitation.org/61lRtzQv5?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109170600.htm |archive-date=May 23, 2024 }} Later that day, Sonca developed a large {{convert|10|nmi}} ragged eye with deep convective banding tightly wrapped into it.{{cite web|title=JTWC — Tropical Cyclone Advisory 12 – Typhoon Sonca |url=http://gwydir.demon.co.uk/advisories/WDPN32-PGTW_201109171500.htm |author=Joint Typhoon Warning Center |access-date=September 18, 2011 |url-status=dead |archive-url=https://archive.today/20240523160903/https://www.webcitation.org/61mnOnpby?url=http://gwydir.demon.co.uk/advisories/WDPN32-PGTW_201109171500.htm |archive-date=May 23, 2024 }} As a result, Sonca strengthened more rapidly and by early the next day, it became a typhoon.{{cite web|title=JMA — Tropical Cyclone Advisory 180600 – Typhoon Sonca |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109180600.htm |publisher=Japan Meteorological Agency |access-date=September 18, 2011 |url-status=dead |archive-url=https://archive.today/20240523160940/https://www.webcitation.org/61mnUC15N?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109180600.htm |archive-date=May 23, 2024 }} On September 19, Sonca reached a peak intensity of {{convert|85|kn}} (1-min mean) and {{convert|70|kn}} (10-min mean) and soon the convection around the northern periphery started weakening.{{cite web|title=JTWC — Tropical Cyclone Advisory 17 – Typhoon Sonca |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109182100.htm |author=Joint Typhoon Warning Center |access-date=September 19, 2011 |url-status=dead |archive-url=https://archive.today/20240523161032/https://www.webcitation.org/61oHENEpH?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109182100.htm |archive-date=May 23, 2024 }} Being embedded in a baroclinic zone with low sea surface temperatures, Sonca started its extratropical transition late on September 19.

{{cite web|title=JTWC — Tropical Cyclone Advisory 19 – Typhoon Sonca|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-19.html|author=Joint Typhoon Warning Center|access-date=September 20, 2011|date=2011-09-20}} The transition took place relatively fast because of a frontal boundary and the JTWC reported that Sonca became extratropical early on September 20,{{cite web|title=JTWC — Tropical Cyclone Advisory 22 – Typhoon Sonca|url=http://vizagbom.blogspot.com/2011/09/jtwc-tropical-cyclone-advisory-22.html|author=Joint Typhoon Warning Center|access-date=September 20, 2011|date=2011-09-20}} while the JMA did the same later in the evening.{{cite web|title=JMA — Tropical Cyclone Advisory 201200 – Typhoon Sonca|url=http://vizagbom.blogspot.com/2011/09/jma-tropical-cyclone-advisory-201200.html|publisher=Japan Meteorological Agency|access-date=September 20, 2011|date=2011-09-20}}

{{clear}}

{{main|Typhoon Nesat (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 23

| Dissipated = September 30

| Image = Nesat 2011-09-26 1758Z.jpg

| Track = Nesat 2011 track.png

| 10-min winds = 80

| 1-min winds = 115

| Pressure = 950

}}

On September 23, both the JMA and the JTWC reported that Tropical Depression 20W, had developed about {{convert|610|km|mi|abbr=on|round=5}} to the southwest of Hagåtña, Guam. Early on September 24, the JMA further upgraded 20W to a tropical storm and named it Nesat.{{cite web|title=JMA — Tropical Cyclone Advisory 240000 – Tropical Storm Nesat |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109240000.htm |publisher=Japan Meteorological Agency |access-date=September 24, 2011 |url-status=dead |archive-url=https://archive.today/20240523112628/https://www.webcitation.org/61vrxn9Lm?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109240000.htm |archive-date=May 23, 2024 }} Nesat continued to drift west with expanding deep convection around the entire system and consolidating convection around the LLCC. The mid-level warm anomaly near the system continued to intensify and convective banding near the LLCC became more and more tighter.{{cite web|title=JTWC — Tropical Cyclone Advisory 06 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109242100.htm |author=Joint Typhoon Warning Center |access-date=September 26, 2011 |url-status=dead |archive-url=https://archive.today/20240523112706/https://www.webcitation.org/61xQKsqhC?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109242100.htm |archive-date=May 23, 2024 }} As a result, the JMA upgraded Nesat to a severe tropical storm on September 25,.{{cite web|title=JMA — Tropical Cyclone Advisory 250000 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109250000.htm |publisher=Japan Meteorological Agency |access-date=September 26, 2011 |url-status=dead |archive-url=https://archive.today/20240522172956/https://www.webcitation.org/61xQ63zeQ?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109250000.htm |archive-date=May 22, 2024 }} Late on the same day, the JMA further upgraded Nesat to a typhoon.{{cite web|title=JMA — Tropical Cyclone Advisory 252100 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109252100.htm |publisher=Japan Meteorological Agency |access-date=September 26, 2011 |url-status=dead |archive-url=https://archive.today/20240523112747/https://www.webcitation.org/61yxveXJz?url=http://gwydir.demon.co.uk/advisories/WTPQ20-RJTD_201109252100.htm |archive-date=May 23, 2024 }} The system rapidly deepened and quickly developed a {{convert|30|nmi}} ragged eye and mesoscale anticyclone aloft generating an exceptionally excellent all-around outflow. Also, the system had a highly symmetric radial outflow. The JTWC originally anticipated Nesat to become a category 4 typhoon on the SSHS with winds exceeding {{convert|130|kn}} (1-min sustained). However, because of a cold anomaly, the system only reached a maximum 1-min sustained wind speed of {{convert|115|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 14 – Typhoon Nesat |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=September 27, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }}

Early on September 27, Nesat made landfall over the Luzon region of Philippines. As a result, the eyewall got eroded and the maximum 1-min sustained winds dropped to {{convert|95|kn}}. The system approached land at nearly {{convert|10|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 15 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109270300.htm |author=Joint Typhoon Warning Center |access-date=September 28, 2011 |url-status=dead |archive-url=https://archive.today/20240522173109/https://www.webcitation.org/620QI2S3U?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109270300.htm |archive-date=May 22, 2024 }} However, later on that day, the LLCC started to get re-consolidated with convection as Nesat quickly moved west and re-emerged over water. At that time, it was located near the southern periphery of a deep layered subtropical steering ridge and moved towards the southwest and the winds further dropped to {{convert|85|kn}} because of land interaction.{{cite web|title=JTWC — Tropical Cyclone Advisory 16 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109270900.htm |author=Joint Typhoon Warning Center |access-date=September 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523113029/https://www.webcitation.org/621ycUxkz?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109270900.htm |archive-date=May 23, 2024 }} Though the system has maintained overall central deep convection, subsidence persisted along the northwest quadrant which caused further drop in wind speed. Upper level analysis indicated that Nesat was to the south of a ridge axis in an area of moderate vertical wind shear.{{cite web|title=JTWC — Tropical Cyclone Advisory 18 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109272100.htm |author=Joint Typhoon Warning Center |access-date=September 28, 2011 |url-status=dead |archive-url=https://archive.today/20240523112951/https://www.webcitation.org/621ycIOZg?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109272100.htm |archive-date=May 23, 2024 }} The system continued to weaken with convective banding loosely wrapped into the partially exposed LLCC. The winds continued to drop and eventually reached {{convert|65|kn}} (1-min sustained) which made it a minimal typhoon on the SSHS. Though the weakening, Water vapour imagery showed that the typhoon was still maintaining excellent outflow towards the equator and improving outflow towards the pole.{{cite web|title=JTWC — Tropical Cyclone Advisory — Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109280900.htm |author=Joint Typhoon Warning Center |access-date=September 30, 2011 |url-status=dead |archive-url=https://archive.today/20240523113149/https://www.webcitation.org/623Tp1kIp?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109280900.htm |archive-date=May 23, 2024 }} Nesat maintained a relatively large area of gale-force winds. Animated infrared satellite imagery depicted that the storm was expanding in size and convective banding continued to move further and further away from the LLCC. The LLCC was also relatively large, elongated and cloud free.{{cite web|title=JTWC — Tropical Cyclone Advisory 22 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109282100.htm |author=Joint Typhoon Warning Center |access-date=September 30, 2011 |url-status=dead |archive-url=https://archive.today/20240523113109/https://www.webcitation.org/623Tou1vP?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109282100.htm |archive-date=May 23, 2024 }}

On September 29, by the time Nesat managed to re-develop ad {{convert|10|nmi}} ragged eye, it made landfall over Wenchang in Hainan, China and started weakening again. Because of the poor shapre and disorganization at the LLCC, the typhoon could only maintain a maximum 1-min sustained windspeed of {{convert|65|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 24 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109290900.htm |author=Joint Typhoon Warning Center |access-date=October 1, 2011 |url-status=dead |archive-url=https://archive.today/20240523113351/https://www.webcitation.org/625GoDh2q?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109290900.htm |archive-date=May 23, 2024 }} Even after the landfall, Nesat maintained vigorous convection all around the LLCC and did not weaken too much when compared to the reactions after the Philippine landfall. There was a sea-surface temperature of approximately {{convert|28|C}} and a slight vertical wind shear of {{convert|10|kn}} near the system's center at that time. The JTWC anticipated the storm to gradually drift over the Gulf of Tonkin and make landfall over Vietnam with a 1-min sustained wind speed of at-least {{convert|50|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 26 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109292100.htm |author=Joint Typhoon Warning Center |access-date=October 1, 2011 |url-status=dead |archive-url=https://archive.today/20240523113310/https://www.webcitation.org/625GnvuBG?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109292100.htm |archive-date=May 23, 2024 }} Early on September 30, Nesat made its final landfall over northern Vietnam with a 1-mim sustained windspeed of {{convert|55|kn}} and a well-defined, tightly wrapped LLCC, and soon it started weakening. The lowest air pressure recorded in Cô Tô during the typhoon was {{convert|981.4|hPa|inHg|2|abbr=on|order=out|round=5}}. Due to land interaction, the convection around the system started decaying rapidly.{{cite web|title=JTWC — Tropical Cyclone Advisory 28 – Typhoon Nesat |url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109300900.htm |author=Joint Typhoon Warning Center |access-date=October 1, 2011 |url-status=dead |archive-url=https://archive.today/20240523113231/https://www.webcitation.org/625GnnRmQ?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201109300900.htm |archive-date=May 23, 2024 }} Due to the rapid weakening, the JTWC ceased advisories on the storm, soon afterwards.{{cite web|title=JTWC — Tropical Cyclone Advisory 29 – Typhoon Nesat |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |author=Joint Typhoon Warning Center |access-date=October 1, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085217/http://weather.noaa.gov/pub/data/raw/wt/wtpn31.pgtw..txt |archive-date=April 30, 2001 }} Later that evening, the JMA downgraded Nesat to a tropical low over land and issued their final warning on the system.{{cite web|title=JMA — Tropical Cyclone Advisory 301800 – Typhoon Nesat|url=http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|archive-url=https://web.archive.org/web/20080517150219/http://weather.noaa.gov/pub/data/raw/wt/wtpq20.rjtd..txt|url-status=dead|archive-date=May 17, 2008|publisher=Japan Meteorological Agency|access-date=October 1, 2011}}

The residents of Manila had nothing to do but wading through waist-deep floodwaters, dodging branches and flying debris as the typhoon sent surging waves as tall as palm trees over seawalls completely submerging neighborhoods. By the evening of September 27, at-least 7 people were reported to be killed and most of them in metropolitan Manila, a place already battered by heavy monsoonal rains. Similar to the Tulane University during Hurricane Katrina, the Manila Hospital moved patients from its ground floor which was flooded with neck-deep waters. Hospital generators were flooded and the building had no power since the typhoon arrived. Soldiers and police in trucks moved thousands of residents, most importantly the women and the children away from the Baseco shanty after many houses were washed away in the storm surge and floodwaters brought by Nesat. The typhoon made landfall before dawn triggering instant response. Authorities ordered more than a hundred thousand people across the country to flee from Typhoon Nesat's rains and wind gusts. Several schools and offices were shut and thousands were stranded after flight and ferry services were completely disrupted by the fierce storm. Nearly thirty-seven percent of Manila Electric Company's service area was left without power after high winds and heavy rains toppled power lines. Also, in Malabon, Navotas and Valenzuela the Manila Electric power company shut down power to prevent any accidents.{{citation needed|date=September 2013}}

During the period when Nesat affected Vietnam, the highest sustained wind speed recorded on land was {{convert|25|m/s|km/h mph|0|abbr=on|order=out|round=5}} at Cửa Ông (Quảng Ninh).

During late 2011, the JTWC instead upgraded Nesat from a category 3 to a category 4 typhoon as a post-analysis.

{{clear}}

{{main|Tropical Storm Haitang (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 24

| Dissipated = September 27

| Image = Haitang 26 Sep 2011.jpg

| Track = Haitang 2011 track.png

| 10-min winds = 35

| 1-min winds = 35

| Pressure = 996

}}

On the evening of September 21, at almost the same time when Nesat was first seen, another low-pressure area persisted far south of Hong Kong.{{cite web|title=JTWC — Tropical Cyclone Warning 211500 – Tropical Storm Nesat and Tropical Depression 31 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201109211500.htm |author=Joint Typhoon Warning Center |access-date=September 24, 2011 |url-status=dead |archive-url=https://archive.today/20240522225853/https://www.webcitation.org/61um6AUnm?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201109211500.htm |archive-date=May 22, 2024 }} The low slowly drifted north and strengthened slowly until September 24, when the JMA upgraded the system to a tropical depression east of Vietnam.{{cite web|title=JMA — Tropical Cyclone Warning 240000 – Tropical Depressions 31 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency |access-date=September 24, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }} Later that day, the JTWC issued a Tropical Cyclone Formation Alert stating that the low could develop into a tropical cyclone.{{cite web|title=JTWC — Tropical Cyclone Formation Alert — Tropical Depression 31 |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |author=Joint Typhoon Warning Center |access-date=September 24, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20010430145016/http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |archive-date=April 30, 2001 }} Only a few hours later, the JTWC initiated advisories on the system, designating it with 21W.{{cite web|title=JTWC — Tropical Cyclone Advisory 01 – Tropical Storm Haitang |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |author=Joint Typhoon Warning Center |access-date=September 29, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt |archive-date=April 30, 2001 }} Early the next day, the storm strengthened significantly that the JMA upgraded it to a tropical storm, naming it Haitang.{{cite web|title=JMA — Tropical Cyclone Advisory 250000 – Tropical Storm Haitang |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109250000.htm |publisher=Japan Meteorological Agency |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240522225933/https://www.webcitation.org/61xQOZFi0?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109250000.htm |archive-date=May 22, 2024 }} Later that day, the storm developed a better organized; however, the system's low-level circulation center (LLCC) became fully exposed due to moderate vertical wind shear from the nearby system, Typhoon Nesat, which also caused the storm to remain very weak with winds of {{convert|35|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 04 – Tropical Storm Haitang |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109250900.htm |author=Joint Typhoon Warning Center |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240522173031/https://www.webcitation.org/61yyCLNO6?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109250900.htm |archive-date=May 22, 2024 }} By that night, wind shear from Nesat, which was moving closer towards Haitang, strengthened and pushed all the convection to the west-southwest keeping the storm relatively weak. Though a ridge building over China impinged poleward outflow, the euquatoward outflow remained significantly excellent. Haitang was also a slow-mover, moving westward at only {{convert|3|kn}}.{{cite web|title=JTWC — Tropical Cyclone Advisory 06 – Tropical Storm Haitang |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109252100.htm |author=Joint Typhoon Warning Center |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240522230013/https://www.webcitation.org/61yyCEY8X?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109252100.htm |archive-date=May 22, 2024 }} However, by the night of September 26, Haitang rapidly accelerated west at over {{convert|13|kn}} and made landfall over Vietnam. Though there was a burst of convection at that time, both land interaction and vertical wind shear weakened the system into a tropical depression and the JTWC ceased their advisories.{{cite web|title=JTWC — Tropical Cyclone Advisory 10 – Tropical Storm Haitang |url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109262100.htm |author=Joint Typhoon Warning Center |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240522230056/https://www.webcitation.org/61zsTQrTp?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109262100.htm |archive-date=May 22, 2024 }} The JMA tracked Haitang as a tropical depression until it finally dissipated inland Vietnam early on September 27,.{{cite web|title=JMA — Tropical Cyclone Advisory 270600 – Tropical Storm Haitang |url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109270600.htm |publisher=Japan Meteorological Agency |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240522230135/https://www.webcitation.org/621yPMXRS?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109270600.htm |archive-date=May 22, 2024 }}

{{clear}}

{{main|Typhoon Nalgae (2011)}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = September 26

| Dissipated = October 5

| Image = Nalgae 2011-09-30 2332Z.png

| Track = Nalgae 2011 track.png

| 10-min winds = 95

| 1-min winds = 130

| Pressure = 935

}}

On September 26, the Japan Meteorological Agency (JMA) started to monitor a weak tropical depression that had developed about {{convert|1260|km|mi|round=5|abbr=on}} to the northwest of Manila in the Philippines.{{cite web|archive-url=https://web.archive.org/web/20071024084420/http://weather.noaa.gov/pub/data/raw/ax/axpq20.rjtd..txt |title=RSMC Tropical Cyclone Best Track: Typhoon Nalgae |archive-date=October 24, 2007 |author=RSMC Tokyo — Typhoon Center |publisher=Japan Meteorological Agency |date=November 14, 2011 |access-date=December 30, 2011 |url=http://www.data.jma.go.jp/fcd/yoho/data/typhoon/T1119.pdf |url-status=dead }} During that day, while the depression moved towards the northwest its low level circulation centre rapidly consolidated in an area of favourable conditions for further development of the system. This prompted the JTWC to issue a Tropical Cyclone Formation Alert on the system early the next day.{{cite web|title=Tropical Cyclone Formation Alert 2011-09-27 06z |url=https://listserv.illinois.edu/wa.cgi?A2%3Dind1109d%26L%3Dwx-tropl%26T%3D0%26X%3D558D791777B97BA4EA%26P%3D90758 |archive-url=https://archive.today/20240523102917/https://www.webcitation.org/64JRxmbjb?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1109d&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=90758 |url-status=dead |archive-date=May 23, 2024 |author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force, United States Air Force |access-date=September 29, 2011 |date=September 27, 2011 }} However less than 3 hours later, the JTWC decided to issue advisories on the system designating it as Tropical Depression 22W, before the JMA reported that the depression had become a tropical storm and named it Nalgae.{{cite web|title=JTWC Tropical Depression 22W Warning 2011-09-27 09z |url=http://gwydir.demon.co.uk/advisories/WTPN33-PGTW_201109270900.htm |author=Joint Typhoon Warning Center |publisher=United States Navy, United States Air Force, United States Air Force |access-date=September 29, 2011 |date=September 27, 2011 |url-status=dead |archive-url=https://archive.today/20240523102318/https://www.webcitation.org/621ylenkb?url=http://gwydir.demon.co.uk/advisories/WTPN33-PGTW_201109270900.htm |archive-date=May 23, 2024 }}{{cite web|title=RSMC Tropical Cyclone Advisory: Tropical Storm Nalgae 2011-09-27 18z |url=http://gwydir.demon.co.uk/advisories/WTPQ22-RJTD_201109271800.htm |author=RSMC Tokyo — Typhoon Center |publisher=Japan Meteorological Agency |date=September 27, 2011 |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240523102356/https://www.webcitation.org/621ySgolJ?url=http://gwydir.demon.co.uk/advisories/WTPQ22-RJTD_201109271800.htm |archive-date=May 23, 2024 }}

The storm slowly drifted to the west and kept on intensifying gradually. Nalgae developed a microwave eye like feature and well defined convective banding in all the quadrants. The system had a tiny radius of winds, though it was still strengthening significantly and was very well defined.{{cite web|title=JTWC — Tropical Cyclone Advisory 07 – Typhoon Nalgae |url=http://gwydir.demon.co.uk/advisories/WTPN33-PGTW_201109282100.htm |author=Joint Typhoon Warning Center |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240523102518/https://www.webcitation.org/623TrLOhr?url=http://gwydir.demon.co.uk/advisories/WTPN33-PGTW_201109282100.htm |archive-date=May 23, 2024 }} On the evening of September 28, the JMA reported that Nalgae continued to intensify, as they upgraded it to a severe tropical storm with winds of over {{convert|55|kn}}.{{cite web|title=JMA — Tropical Cyclone Advisory 281800 – Typhoon Nalgae |url=http://gwydir.demon.co.uk/advisories/WTPQ22-RJTD_201109281800.htm |publisher=Japan Meteorological Agency |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240523102437/https://www.webcitation.org/623The4yG?url=http://gwydir.demon.co.uk/advisories/WTPQ22-RJTD_201109281800.htm |archive-date=May 23, 2024 }} On that night, the PAGASA initiated advisories on Nalgae, giving it the local name Quiel, as it entered the Philippine Area of Responsibility (PAR).{{cite web|title=Severe Weather Bulletin Number ONE — Tropical Storm "QUIEL" |url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109282100.htm |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |access-date=September 29, 2011 |url-status=dead |archive-url=https://archive.today/20240523102558/https://www.webcitation.org/623Twr7tW?url=http://gwydir.demon.co.uk/advisories/TCUPDATE_201109282100.htm |archive-date=May 23, 2024 }} Late on September 29, the JMA upgraded Nalgae to a typhoon. Nalgae rapidly intensified on September 30, and attained category 4 super typhoon status early on October 1, just before making landfall over Luzon. Due to land interaction and colder sea surface temperature in the South China Sea, the JMA downgraded Nalgae to a severe tropical storm on October 2, and then a tropical storm late on October 3. The JTWC downgraded Nalgae to a tropical depression on October 4, and the JMA also did it on the next day. Later on October 5, the remnant low of Nalgae dissipated.

Striking the Philippines just days after Typhoon Nesat, Nalgae caused further damage across Luzon. Although first feared that Nalgae would cause much more damage to Luzon, which was severely affected by Typhoon Nesat, damage from the storm was not as anticipated to be lighter than Typhoon Nesat, which ironically is much weaker than Nalgae, but high winds and heavy rains from the storm caused widespread power outages and flooding that left many communities isolated. Nearly 2,900 homes were destroyed and approximately another 15,400 sustained damage. At least 18 people were killed by the storm and another 7 were reported as missing as of October 11. A total of 1,113,763 people were affected by the storm. Total losses in the country reached just over ₱115 million ($2.62 million).{{cite web|publisher=National Disaster Risk Reduction and Management Council |date=November 11, 2011 |access-date=November 30, 2011 |title=NDRRMC Update SitRep No. 13 on Typhoon "Quiel" (Nalgae) |url=http://www.ndrrmc.gov.ph/attachments/article/310/NDRRMC%20Update%20Sitrep%20No.Sitrep%20No.13%20re%20Effects%20of%20Typhoon%20QUIEL%20(NALGAE)%20as%20of%2011OCT2011,%206AM.pdf }}{{dead link|date=June 2017 |bot=InternetArchiveBot |fix-attempted=yes }}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = October 9

| Dissipated = October 14

| Image = Banyan-11-Oct-2011.jpg

| Track = Banyan 2011 track.png

| 10-min winds = 35

| 1-min winds = 30

| Pressure = 1002

}}

On October 7, the JTWC started monitoring a tropical disturbance that had developed in an area of low vertical windshear, about {{convert|750|km|mi|abbr=on}} to the south of Hagåtña, Guam.{{cite web|author=Joint Typhoon Warning Center |title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-10-07 06z |access-date=March 6, 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=February 16, 2007 |publisher=United States Navy, United States Air Force |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |url-status=dead }} Over the next couple of days the system gradually developed further while moving towards the west, before the JMA reported on October 9, that the disturbance had developed into a tropical depression.{{cite web|title=RSMC Tropical Cyclone Best Track: Tropical Storm Banyan |archive-url=https://web.archive.org/web/20071024084420/http://weather.noaa.gov/pub/data/raw/ax/axpq20.rjtd..txt |author=RSMC Tokyo — Typhoon Center |date=November 14, 2011 |archive-date=October 24, 2007 |publisher=Japan Meteorological Agency |access-date=December 30, 2011 |url=http://www.data.jma.go.jp/fcd/yoho/data/typhoon/T1120.pdf |url-status=dead }} Early on October 10, the JTWC upgraded the system to a tropical depression designating as 23W, and the PAGASA also upgraded it to a tropical depression and named it Ramon. On October 11, the JMA and the JTWC upgraded the system to a tropical storm and named it Banyan. Early on October 12, Banyan made landfall over Leyte, Philippines, and the JTWC downgraded it to a tropical depression. A half day later, the JMA also downgraded Banyan to a tropical depression. The system dissipated in the South China Sea, on October 16,.

While tracking through the Philippines, Banyan produced heavy rains across much of the country, leading to widespread flooding. At least ten people were killed by the storm and another was reported missing. A total of 75,632 people were affected by the storm.{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=October 19, 2011 |access-date=November 29, 2011 |title=NDRRMC Update SitRep No. 15 on Tropical Storm "Ramon" |url=http://www.ndrrmc.gov.ph/attachments/article/322/NDRRMC%20Update%20Sitrep%20No.%2015%20re%20Effects%20of%20Tropical%20Storm%20RAMON.pdf }}{{dead link|date=June 2017 |bot=InternetArchiveBot |fix-attempted=yes }}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter =

| Image = 24-W Nov 7 2011 0620Z.jpg

| Formed = November 7

| Dissipated = November 8

| Track = 24W 2011 track.png

| Pressure = 1004

| 10-min winds = 25

| 1-min winds = 25

}}

On November 5, the JTWC started to monitor a tropical disturbance that had developed within an area of low vertical windshear, about {{convert|640|km|mi|round=5|abbr=on}} to the east-southeast of Ho Chi Minh City in Vietnam.{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt|archive-url=https://archive.today/20240522173151/https://www.webcitation.org/62zdya82r?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201111050600.htm|title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans November 5, 2011 06z|author=Joint Typhoon Warning Center|archive-date=May 22, 2024|url-status=dead|access-date=August 7, 2013|date=November 5, 2011|publisher=United States Navy, United States Air Force}} Over the next couple of days the disturbance moved towards the north-northwest as atmospheric convection surrounding the system wrapped into the disturbances developing low-level circulation center. During November 7, the JMA and the JTWC reported that the disturbance had become a tropical depression and started to warn on it with the latter designating it as Tropical Depression 24W.

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter = JMA

| Image = 25-W Dec 4 2011 0300Z.jpg

| Formed = December 3

| Dissipated = December 5

| Track = 25W 2011 track.png

| Pressure = 1006

| 10-min winds =

| 1-min winds = 25

}}

During December 3, the JTWC started to monitor a tropical disturbance, that had developed within an area of moderate vertical windshear, about {{convert|180|km|mi|round=5|abbr=on}} to the northwest of Bandar Seri Begawan, Brunei.{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt|archive-url=https://archive.today/20240522173318/https://www.webcitation.org/63hgY4u9f?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201112032330.htm|title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans December 3, 2011 06z|author=Joint Typhoon Warning Center|url-status=dead|archive-date=May 22, 2024|access-date=August 7, 2013|date=December 3, 2011|publisher=United States Navy, United States Air Force}}{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2011/2011s-bwp/bwp252011.dat |author=Joint Typhoon Warning Center |archive-date=July 2, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120702114645/http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2011/2011s-bwp/bwp252011.dat |access-date=August 7, 2013 |title=Tropical Depression 25W Best Track Analysis |publisher=United States Navy, United States Airforce }} During that day deep atmospheric convection surrounding the system built over the disturbances low level circulation, before the JTWC reported during the next day, that the disturbance had developed into a tropical cyclone and designated it as Tropical Depression 25W.{{cite report |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp2511web.txt |date=December 4, 2011 |access-date=August 5, 2013 |author=Joint Typhoon Warning Center |archive-date=May 22, 2024 |title=Tropical Cyclone 25W Warning 1; December 4, 2011 15z |archive-url=https://archive.today/20240522173234/https://www.webcitation.org/63hgjcXvY?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201112041500.htm |publisher=United States Navy, United States Air Force |url-status=dead }} Despite being predicted to intensify into a tropical storm after being designated, the depression moved towards the northwest and rapidly deteriorated as it interacted with the cold and dry north-easterlies, as a result the JTWC issued their final warning on the system early on December 5.{{cite report |url=http://www.usno.navyph/RSS/jtwc/warnings/wp2511web.txt |date=December 5, 2011 |access-date=August 5, 2013 |author=Joint Typhoon Warning Center |archive-date=May 23, 2024 |title=Tropical Cyclone 25W Warning 3; December 5, 2011 09z |archive-url=https://archive.today/20240523161104/https://www.webcitation.org/63hgjU3yZ?url=http://gwydir.demon.co.uk/advisories/WTPN31-PGTW_201112050300.htm |publisher=United States Navy, United States Air Force |url-status=dead }}

{{clear}}

{{Infobox tropical cyclone small

| Basin = WPac

| WarningCenter = JMA

| Image = 26-W Dec 11 2011 0605Z.jpg

| Formed = December 10

| Dissipated = December 14

| Track = 26W 2011 track.png

| Pressure = 1004

| 10-min winds = 30

| 1-min winds = 30

}}

On December 9, the JTWC started to monitor a tropical disturbance that had developed about {{convert|550|km|mi|round=5|abbr=on}} to the south-southeast of Manila on Luzon Island.{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2011/2011s-bwp/bwp262011.dat |author=Joint Typhoon Warning Center |archive-date=July 2, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120702114645/http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2011/2011s-bwp/bwp252011.dat |access-date=August 7, 2013 |title=Tropical Depression 26W Best Track Analysis |publisher=United States Navy, United States Airforce }} On December 11, the JTWC cancelled the TCFA on the disturbance due to the interaction with the cold air coming from the north. The tropical depression reached peak intensity during midday, on December 11, as it was located over the center, of the South China Sea. But later that day, the depression began to weaken rapidly, as the storm moved southeastward. However, the JTWC issued a TCFA on the disturbance again early on December 12, because of a decrease in vertical wind shear. After a few hours, the JTWC upgraded it to a tropical depression and designated as 26W. After a couple of days drifting southwestwards in the South China Sea, on December 13, the JTWC issued their final advisories on the system as it started to weaken. Late on December 14, the tropical depression dissipated near Borneo.

{{clear}}

{{main|Tropical Storm Washi}}

{{Infobox tropical cyclone small

| Basin = WPac

| Formed = December 13

| Dissipated = December 19

| Image = 2011 Washi.jpg

| Track = Washi 2011 track.png

| 10-min winds = 50

| 1-min winds = 50

| Pressure = 992

}}

On December 11, a disturbance formed and persisted near Chuuk. On December 13, the low-pressure area rapidly intensified prompting the JTWC to issue a TCFA. On the same day, the JTWC upgraded the low pressure to a tropical depression and designated as 27W; in addition, the JMA also upgraded it to a tropical depression. The JTWC upgraded the system to a tropical storm on December 14, but downgraded it to a tropical depression early on December 15, and the PAGASA designated it Sendong as it entered the Philippine Area of Responsibility. After passing Palau on December 15, both the JTWC and the JMA upgraded the system to a tropical storm and named it Washi. On December 16, Washi made landfall over Surigao del Sur, a province of the Philippines located in Mindanao. Several hours later, Washi arrived at the Sulu Sea and regained its strength quickly, due to slight land interaction with Mindanao. Late on December 17, Washi crossed Palawan, and arrived at the South China Sea. On December 19, Washi weakened into a tropical depression and dissipated.

In the Philippines, Washi has caused at least 1,268 fatalities, and 1,079 people are officially listed as missing. Washi had affected 102,899 families or 674,472 people in 766 villages in 52 towns and eight cities in 13 provinces.{{cite web|url=http://news.xinhuanet.com/english/world/2011-12/25/c_131326068.htm|archive-url=https://web.archive.org/web/20120422083133/http://news.xinhuanet.com/english/world/2011-12/25/c_131326068.htm|url-status=dead|archive-date=April 22, 2012|title=Death toll from tropical storm climbs to 1,236 in Philippines|date=December 25, 2011|publisher=English.news.cn|access-date=December 25, 2011|location=Philippines}}{{cite web|url=http://www.ndrrmc.gov.ph/attachments/article/358/NDRRMC%20Update%20Sitrep%20No.11%20as%20of%2020%20Dec%202011,%206AM.pdf |title=SitRep No.11 re Effects of Tropical Storm "SENDONG" (WASHI) |date=December 20, 2011 |publisher=National Disaster Risk Reduction and management council |access-date=December 20, 2011 |location=Philippines |url-status=dead |archive-url=https://web.archive.org/web/20120119031401/http://www.ndrrmc.gov.ph/attachments/article/358/NDRRMC%20Update%20Sitrep%20No.11%20as%20of%2020%20Dec%202011%2C%206AM.pdf |archive-date=January 19, 2012 }} The majority of the deaths were in the cities of Iligan and Cagayan de Oro. Five people were killed in a landslide, but all others died in flash flooding. More than 2,000 have been rescued, according to the Armed Forces of the Philippines. Officials were also investigating reports that an entire village was swept away. The flash flooding occurred overnight, following 10 hours of rain, compounded by overflowing rivers and tributaries. In some areas, up to 20 centimeters of rain fell in 24 hours. At least 20,000 people were staying in 10 evacuation centers in Cagayan de Oro. Officials said that despite government warning, some people did not evacuate. At least 9,433 houses were destroyed while 18,616 were damaged.{{cite web|title=Death toll from Philippine storm reaches 569; hundreds missing|date=December 18, 2011 |url=https://edition.cnn.com/2011/12/18/world/asia/philippines-storm/index.html|publisher=CNN|access-date=December 18, 2011}}

{{clear}}

File:JMA TD 22 20 08 2011.jpg

The following weak tropical depressions were also monitored by one or more of the warning centers, however they were either short lived or did not significantly develop further. On May 31, the JMA reported that a tropical depression had developed at the southern end of a shear line, about {{convert|420|km|mi|abbr=on}} to the southeast of Hong Kong, China.{{cite web|title=JMA WWJP25 Warning and Summary 2011-05-31 18z |url-status=dead |archive-date=May 2, 2001 |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |access-date=March 5, 2012 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency }}{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |title=Significant Tropical Weather Outlook for the Western and South Pacific Oceans 2011-05-30 06z |author=Joint Typhoon Warning Center |url-status=dead |archive-date=February 16, 2007 |access-date=December 28, 2011 |publisher=United States Navy, United States Air Force }} During that day as the depression moved towards the north-northeast, a trough of low pressure located over Hainan island and dry cold air wrapping into the depression's circulation inhibited further development of the depression.{{cite web|archive-url=https://web.archive.org/web/20100305204921/http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |access-date=March 5, 2012 |archive-date=March 5, 2010 |title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-06-01 14z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |publisher=United States Navy, United States Airforce |author=Joint Typhoon Warning Center |url-status=dead }} The depression then degenerated into an area of low pressure during the next day, before it dissipated during June 2,.{{cite web|archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |access-date=December 28, 2011 |archive-date=May 2, 2001 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-06-01 18z |publisher=Japan Meteorological Agency |url-status=live }}{{cite web|title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-06-02 06z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=May 22, 2024 |publisher=United States Navy, United States Air Force |author=Joint Typhoon Warning Center |access-date=March 5, 2012 |archive-url=https://archive.today/20240522173352/https://www.webcitation.org/64GJ7iXkA?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1106a&L=wx-tropl&D=0&T=0&X=558D791777B97BA4EA&P=7911 |url-status=dead }} On June 14, the JMA reported that a tropical depression had developed within an area of moderate vertical windshear, about {{convert|475|mi|km|abbr=on}} to the southwest of Manila, Philippines.{{cite web|archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |access-date=March 10, 2012 |archive-date=May 2, 2001 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-06-14 18z |publisher=Japan Meteorological Agency |url-status=live }}{{cite web|title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-06-14 06z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=February 16, 2007 |publisher=United States Navy, United States Air Force |author=Joint Typhoon Warning Center |access-date=March 10, 2012 |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |url-status=dead }} During that day the depression moved to the north-northwest, before the system dissipated during the next day.{{cite web|title=Significant Tropical Weather Outlook for the Western and South Pacific Ocean 2011-06-15 20z |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-date=February 16, 2007 |publisher=United States Navy, United States Air Force |author=Joint Typhoon Warning Center |access-date=March 10, 2012 |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |url-status=dead }} On July 16, the JMA reported that a tropical depression had developed about {{convert|225|km|mi|abbr=on}} to the east of Hanoi in northern Vietnam, however it quickly weakened after interacting with land.{{cite web|archive-url=https://archive.today/20240523161302/https://www.webcitation.org/63u9QCKnP?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201107160000.htm |access-date=March 5, 2012 |archive-date=May 23, 2024 |publisher=Japan Meteorological Agency |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-07-16 00z |url-status=live }}{{cite web|archive-url=https://archive.today/20240523161826/https://www.webcitation.org/666xTv7mJ?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1107c&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=19058 |access-date=March 5, 2012 |archive-date=May 23, 2024 |publisher=Japan Meteorological Agency |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-07-16 06z |url-status=dead }} {{citation needed span|text=In the morning of July 16, the Japan Meteorological Agency located in an area of low pressure on the land was upgraded to a tropical depression later on the same day. On July 17, the JMA downgraded the tropical depression to a low pressure. The Hong Kong Observatory only classified the tropical depression as a trough of low pressure is not to be ignored, while the Joint Typhoon Warning Center nor recognize this as a tropical disturbance.|date=May 2014}} On August 19, a low-pressure area developed east-northeast of Guam.{{cite web|title=JTWC Tropical Cyclone Warning 190030 – Pre-Tropical Depression 22 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108190030.htm |author=Joint Typhoon Warning Center |access-date=August 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523160256/https://www.webcitation.org/6152C2Adu?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108190030.htm |archive-date=May 23, 2024 }} Early on August 20, the system developed a broad area of low level circulation center and a good divergence aloft becoming more well defined.{{cite web|title=JTWC Tropical Cyclone Warning 200100 – Pre-Tropical Depression 22 |url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108200100.htm |author=Joint Typhoon Warning Center |access-date=August 21, 2011 |url-status=dead |archive-url=https://archive.today/20240523104449/https://www.webcitation.org/6151uraG4?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201108200100.htm |archive-date=May 23, 2024 }} Later that day, the JMA upgraded the system to a tropical depression southeast of the Bonin Islands.{{cite web|title=JMA — Tropical Cyclone Advisory 200600 – Tropical Depression 22 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 20, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }} On August 22, the system started interacting with an anticyclone and was exposed to a strong vertical wind shear, prompting the JMA to stop monitoring the system as a tropical depression, as the system dissipated to a remnant low.{{cite web|title=JMA — Tropical Cyclone Advisory 221200 – Tropical Depression 22 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 22, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }}{{cite web|title=JTWC — Tropical Cyclone Warning 221430 – Tropical Depression 22 |url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |author=Joint Typhoon Warning Center |access-date=August 22, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20070216233156/http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |archive-date=February 16, 2007 }} However, at midnight, the same day, the remnants regenerated, and the JMA started tracking the system as a tropical depression again, until it last appeared near Okinawa, Japan on August 25, as the system dissipated completely.{{cite web|title=JMA — Tropical Cyclone Advisory 230000 – Tropical Depression 22, 23, 24 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 23, 2011 |url-status=live |archive-url=https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-date=May 2, 2001 }}{{cite web|title=JMA — Tropical Cyclone Advisory 250000 – Tropical Depression 22 |url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201108250000.htm |work=JMA Tropical Cyclone Advisories |publisher=Japan Meteorological Agency |access-date=August 25, 2011 |url-status=dead |archive-url=https://archive.today/20240523160337/https://www.webcitation.org/61CO2qP8l?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201108250000.htm |archive-date=May 23, 2024 }} On September 14, the JMA started to monitor a tropical depression that had developed about {{convert|720|km|mi|abbr=on}} to the southeast of Taipei in Taiwan.{{cite web|title=JMA WWJP25 Warning and Summary 2011-09-14 00z|publisher=Japan Meteorological Agency|archive-url=https://archive.today/20240523161223/https://www.webcitation.org/63u8VM583?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201109140000.htm|access-date=March 5, 2012|archive-date=May 23, 2024|url-status=dead|url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt}} During that day, the depression remained near stationary, before becoming stationary, the JMA then last noted the depression late on September 15, as it was absorbed by Typhoon Roke.{{cite web|title=JMA WWJP25 Warning and Summary 2011-09-15 18z |archive-url=https://archive.today/20240523161139/https://www.webcitation.org/63u8Uqbvc?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201109151800.htm |access-date=March 5, 2012 |archive-date=May 23, 2024 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |publisher=Japan Meteorological Agency |url-status=live }}{{cite web|archive-url=https://archive.today/20240523161741/https://www.webcitation.org/65wBVlnzH?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1109c&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=16440 |access-date=March 5, 2012 |archive-date=May 23, 2024 |publisher=Japan Meteorological Agency |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-09-16 00z |url-status=dead }}

{{citation needed span|text=On October 11, the JMA reported that a tropical depression had developed to the southeast of Hainan Island. Late on October 13, the system dissipated, just after making landfall over Vietnam.|date=November 2013}}

On December 24, the JMA reported that a tropical depression had developed about {{convert|1768|km|mi|abbr=on}} to the southeast of Manila, in the Philippines.{{cite web|title=JMA WWJP25 Warning and Summary 2011-12-24 12z |archive-date=May 23, 2024 |access-date=March 4, 2012 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-url=https://archive.today/20240523161705/https://www.webcitation.org/65uiM6JRL?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1112d&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=34369 |url-status=dead |publisher=Japan Meteorological Agency }} During that day, the depression moved towards the northwest before the JMA issued their final advisory on the system.{{cite web|publisher=Japan Meteorological Agency |title=JMA WWJP25 Warning and Summary 2011-12-24 18z |access-date=March 12, 2012 |archive-date=May 23, 2024 |url-status=dead |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-url=https://archive.today/20240523161342/https://www.webcitation.org/64EEEOGeK?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201112241800.htm }}{{cite web|access-date=March 12, 2012 |archive-date=May 23, 2024 |url-status=dead |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-url=https://archive.today/20240523161342/https://www.webcitation.org/64EEEOGeK?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201112241800.htm |title=JMA WWJP25 Warning and Summary 2011-12-25 00z |publisher=Japan Meteorological Agency }} The final tropical depression of the year then developed on December 31, about {{convert|340|km|mi|round=5|abbr=on}} to the northeast of Kuala Lumpur, Malaysia.{{cite web|url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |access-date=March 4, 2012 |url-status=dead |archive-url=https://archive.today/20240522173554/https://www.webcitation.org/64Q5Yhaft?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201112310600.htm |title=JMA WWJP25 Warning and Summary 2011-12-31 06z |archive-date=May 22, 2024 |publisher=Japan Meteorological Agency }} During that day the system moved slowly towards the northwest before it was last noted early the next day on January 1, 2012.{{cite web|url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2011-12-31 18z |archive-url=https://archive.today/20240523161622/https://www.webcitation.org/64Q5XhOHk?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201201010600.htm |access-date=March 4, 2012 |publisher=Japan Meteorological Agency |archive-date=May 23, 2024 |url-status=live }}{{cite web|publisher=Japan Meteorological Agency |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2012-01-01 06z |archive-url=https://archive.today/20240523161622/https://www.webcitation.org/64Q5XhOHk?url=http://gwydir.demon.co.uk/advisories/WWJP25-RJTD_201201010600.htm |archive-date=May 23, 2024 |access-date=March 12, 2012 |url-status=live }}{{cite web|publisher=Japan Meteorological Agency |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |title=JMA WWJP25 Warning and Summary 2012-01-01 12z |archive-url=https://archive.today/20240526024801/https://www.webcitation.org/69WQGOJwv?url=https://listserv.illinois.edu/wa.cgi%3FA2=ind1201a&L=wx-tropl&T=0&X=558D791777B97BA4EA&P=4816 |archive-date=May 26, 2024 |access-date=March 12, 2012 |url-status=dead }}

{{See also|Tropical cyclone naming|History of tropical cyclone naming}}

Within the North-western Pacific Ocean, both the Japan Meteorological Agency (JMA) and the Philippine Atmospheric, Geophysical and Astronomical Services Administration assign names to tropical cyclones that develop in the Western Pacific, which can result in a tropical cyclone having two names.{{cite web|title=Monthly Tropical Cyclone summary December 1999 |access-date=August 28, 2012 |url-status=live |author=Padgett, Gary |publisher=Australian Severe Weather |url=http://www.australiasevereweather.com/cyclones/2000/summ9912.htm |archive-url=https://web.archive.org/web/20020209141515/http://www.australiasevereweather.com/cyclones/2000/summ9912.htm |archive-date=February 9, 2002 }} The Japan Meteorological Agency's RSMC Tokyo — Typhoon Center assigns international names to tropical cyclones on behalf of the World Meteorological Organization's Typhoon Committee, should they be judged to have 10-minute sustained windspeeds of {{convert|65|km/h|mph|abbr=on}}.{{cite web|title=Typhoon Committee Operational Manual 2012 |url=http://www.wmo.int/pages/prog/www/tcp/documents/TCP-23EDITION2012.pdf |archive-url=https://web.archive.org/web/20130801020116/http://www.wmo.int/pages/prog/www/tcp/documents/TCP-23EDITION2012.pdf |publisher=World Meteorological Organization |archive-date=August 1, 2013 |pages=37–38 |date=February 21, 2012 |author=the Typhoon Committee |url-status=live }} While the Philippine Atmospheric, Geophysical and Astronomical Services Administration assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N-25°N even if the cyclone has had an international name assigned to it. The names of significant tropical cyclones are retired, by both PAGASA and the Typhoon Committee. Should the list of names for the Philippine region be exhausted then names will be taken from an auxiliary list of which the first ten are published each season. Unused names are marked in {{tcname unused}}.

{{main|List of retired Pacific typhoon names}}

During the season 21 tropical storms developed in the Western Pacific and each one was named by the JMA, when the system was judged to have 10-minute sustained windspeeds of {{convert|65|km/h|mph|round=5|abbr=on}}. The JMA selected the names from a list of 140 names, that had been developed by the 14 members nations and territories of the ESCAP/WMO Typhoon Committee.

After the season the Typhoon Committee retired the name Washi from its naming lists, and in February 2012, it was subsequently replaced with Hato for future seasons.

{{main|List of retired Philippine typhoon names}}

During the season PAGASA used its own naming scheme for the 19 tropical cyclones, that either developed within or moved into their self-defined area of responsibility.{{cite web|title=Philippine Tropical Cyclone Names|access-date=January 20, 2016|publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration|url=http://www.pagasa.dost.gov.ph/index.php/learning-tools/94-weather/278-philippine-tropical-cyclone-names|url-status=dead|archive-url=https://web.archive.org/web/20161228042559/http://www.pagasa.dost.gov.ph/index.php/learning-tools/94-weather/278-philippine-tropical-cyclone-names|archive-date=December 28, 2016}} The names were taken from a list of names, that had been last used during 2007 and are scheduled to be used again during 2015. The names Nonoy, Onyok, Pedring, Quiel, Ramon and Sendong were used for the first (and only, in the cases of Pedring and Sendong) time during the year.

{{clear}}

After this season, the Typhoon Committee retired the name Washi from its naming lists, and in February 2012, it was subsequently replaced with Hato for future seasons.

Meanwhile, the names Bebeng, Juaning, Mina, Pedring and Sendong were retired by PAGASA, as they had caused over ₱1 billion in damages, and in Sendong's case, over 300 deaths. They were subsequently replaced on the list with Betty, Jenny, Marilyn, Perla, and Sarah.{{cite news |title=3 destructive cyclones expected this month — Pagasa |url=http://www.philstar.com/Article.aspx?articleId=722574&publicationSubCategoryId=63 |author=Flores, Helen |date=September 1, 2011 |work=The Philippine Star |access-date=December 31, 2011 |archive-url=https://archive.today/20120909043745/http://www.philstar.com/Article.aspx?articleId=722574&publicationSubCategoryId=63 |archive-date=September 9, 2012 |url-status=dead }}{{cite news|url=http://www.philstar.com/Article.aspx?articleId=734367&publicationSubCategoryId=63|archive-url=https://archive.today/20120908122541/http://www.philstar.com/Article.aspx?articleId=734367&publicationSubCategoryId=63|url-status=dead|archive-date=September 8, 2012|access-date=October 6, 2011|title=Combined death toll from 'Pedring,' 'Quiel' rises to 76|author=Romero, Alexis|date=October 6, 2011|work=The Philippine Star}}{{cite news |title=Government will no longer use Sendong to name typhoons |author=Unattributed |url=http://www.sunstar.com.ph/manila/local-news/2011/12/21/government-will-no-longer-use-sendong-name-typhoons-196940 |date=December 23, 2011 |work=Sun Star Manila |access-date=December 26, 2011 |archive-url=https://web.archive.org/web/20130804060329/http://www.sunstar.com.ph/manila/local-news/2011/12/21/government-will-no-longer-use-sendong-name-typhoons-196940 |archive-date=August 4, 2013 |url-status=dead }}

{{clear}}

This table lists all of the tropical cyclones that were monitored during the 2011 Pacific typhoon season. Information on their intensity, duration, name, areas affected, primarily comes from the warning centres while death and damage reports come from either press reports or the relevant national disaster management agency and include any impact that was associated with the system.

{{Pacific areas affected (Top)}}

|-

| 01W || {{Sort|110401|April 1–4}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| 02W (Amang) || {{Sort|110403|April 3–6}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1000|{{convert|1000|hPa|inHg|sigfig=4|abbr=on}}}} || Mariana Islands || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Aere (Bebeng) || {{Sort|110505|May 5–12}}|| bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|075|{{convert|75|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|0992|{{convert|992|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, Japan || {{ntsp|34400000||$}} || {{nts|48}} ||

|-

| Songda (Chedeng) || {{Sort|110519|May 19–29}} || bgcolor=#{{storm colour|VITY}}|{{Sort|5|Violent typhoon}} || bgcolor=#{{storm colour|VITY}}|{{Sort|195|{{convert|195|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VITY}}|{{Sort|0920|{{convert|920|hPa|inHg|sigfig=4|abbr=on}}}} || Micronesia, Philippines, Japan, British Columbia || {{ntsp|65156000||$}} || {{nts|17}} ||{{zwsp}}{{zwsp}}

|-

| TD || {{Sort|110531|May 31 – June 1}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Sarika (Dodong) || {{Sort|110608|June 8–11}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|075|{{convert|75|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|0996|{{convert|996|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China || {{ntsp|248000000||$}} || {{nts|28}} ||{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=June 10, 2011 |access-date=June 10, 2011 |title=NDRRMC Update SitRep No. 5 on Tropical Storm "Dodong" |url=http://www.ndcc.gov.ph/attachments/article/223/NDRRMC%20Update%20Sitrep%20No.%205%20re%20Effects%20of%20TS%20DODONG%2010%20June%202011,%207PM.pdf |url-status=dead |archive-url=https://web.archive.org/web/20111007120015/http://www.ndcc.gov.ph/attachments/article/223/NDRRMC%20Update%20Sitrep%20No.%205%20re%20Effects%20of%20TS%20DODONG%2010%20June%202011%2C%207PM.pdf |archive-date=October 7, 2011 }}

|-

| TD || {{Sort|110614|June 14–15}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || China || {{ntsh|0}} None || {{ntsh|0}} None ||{{cite web|author1=National Weather Service Forecast Office Guam |title=Storm Events Database: Guam: Tropical Storm Sanvu |url=http://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=386231 |author2=National Climatic Data Center |publisher=National Oceanic and Atmospheric Administration |archive-url=https://web.archive.org/web/20141220095827/http://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=386231 |archive-date=December 20, 2014 |year=2012 |url-status=live }}

|-

| Haima (Egay) || {{Sort|110616|June 16–25}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|75|{{convert|75|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|0985|{{convert|985|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China, Vietnam, Laos, Thailand || {{ntsp|167000000||$}} || {{nts|18}} ||

|-

| Meari (Falcon) || {{Sort|110620|June 20–27}} || bgcolor=#{{storm colour|STS}}|{{Sort|2|Severe tropical storm}} || bgcolor=#{{storm colour|STS}}|{{Sort|110|{{convert|110|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|STS}}|{{Sort|0975|{{convert|975|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China, Japan, Korea || {{ntsp|47000000||$}} || {{nts|11}} ||{{cite web|publisher=National Disaster Risk Reduction and Management Council |date=June 26, 2012 |access-date=August 7, 2012 |title=Final Report re Effects of Southwest Monsoon and Typhoon "Butchoy" (Guchol) |url=http://www.ndrrmc.gov.ph/attachments/article/562/NDRRMC%20Update%20Final%20%20BUTCHOY.pdf }}{{dead link|date=September 2016 |bot=InternetArchiveBot |fix-attempted=yes }}{{zwsp}}{{cite web|publisher=AON Benfield|date=July 2012|access-date=August 7, 2012|title=June 2012 Global Catastrophe Recap|url=http://thoughtleadership.aonbenfield.com/Documents/201207_if_monthly_cat_recap_june.pdf|archive-date=August 5, 2012|archive-url=https://web.archive.org/web/20120805183147/http://thoughtleadership.aonbenfield.com/Documents/201207_if_monthly_cat_recap_june.pdf|url-status=dead}}

|-

| Goring || {{Sort|110708|July 8–10}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|045|{{convert|45|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1000|{{convert|1000|hPa|inHg|sigfig=4|abbr=on}}}} || Japan, Taiwan || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Ma-on (Ineng) || {{Sort|110711|July 11–24}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|4|Very strong typhoon}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|175|{{convert|175|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|0935|{{convert|935|hPa|inHg|sigfig=4|abbr=on}}}} || Mariana Islands, Japan || {{ntsp|50000000||$}} || {{nts|5}} ||{{cite news|date=August 23, 2011 |archive-date=October 4, 2013 |archive-url=https://web.archive.org/web/20131004232359/http://www.prnewswire.com/news-releases/global-storm-activity-increases-in-july-as-the-atlantic-hurricane-season-approaches-peak-period-according-to-aon-benfield-study-126770338.html |title=Global storm activity increases in July as the Atlantic hurricane season approaches peak period, According to Aon Benfield Study |agency=CPI Financial |url=http://www.prnewswire.com/news-releases/global-storm-activity-increases-in-july-as-the-atlantic-hurricane-season-approaches-peak-period-according-to-aon-benfield-study-126770338.html |access-date=February 25, 2012 |url-status=live }}

|-

| Tokage (Hanna) || {{Sort|110713|July 13–15}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|065|{{convert|65|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|1000|{{convert|1000|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None|| {{ntsh|0}} None ||

|-

| TD || {{Sort|110716|July 16–17}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1000|{{convert|1000|hPa|inHg|sigfig=4|abbr=on}}}} || China || {{ntsh|0}} None|| {{ntsh|0}} ||

|-

| Nock-ten (Juaning) || {{Sort|110724|July 24–31}} || bgcolor=#{{storm colour|STS}}|{{Sort|2|Severe tropical storm}} || bgcolor=#{{storm colour|STS}}|{{Sort|095|{{convert|95|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|STS}}|{{Sort|0985|{{convert|985|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China, Vietnam, Laos, Thailand|| {{ntsp|126300000||$}}|| {{nts|128}} ||{{cite web|work=National Disaster Risk Reduction and Management Council|publisher=National Disaster Coordinating Council|date=July 28, 2011|access-date=July 28, 2011|title=NDRRMC Update SitRep No. 7 on Tropical Storm "Juaning"|url=http://www.ndcc.gov.ph/attachments/article/251/NDRRMC%20Update%20SitRep%20No.%208%20for%20Tropical%20Storm%20JUANING%20%28Nock-Ten%29.pdf|url-status=dead|archive-url=https://web.archive.org/web/20111007120045/http://www.ndcc.gov.ph/attachments/article/251/NDRRMC%20Update%20SitRep%20No.%208%20for%20Tropical%20Storm%20JUANING%20%28Nock-Ten%29.pdf|archive-date=October 7, 2011}}

|-

| Muifa (Kabayan) || {{Sort|110725|July 25 – August 9}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|4|Very strong typhoon}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|175|{{convert|175|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|0930|{{convert|930|hPa|inHg|sigfig=4|abbr=on}}}} || Caroline Islands, Philippines, Japan, China, Korea || {{ntsp|480000000||$}} || {{nts|22}} ||{{cite web|work=National Disaster Risk Reduction and Management Council |publisher=National Disaster Coordinating Council |date=August 4, 2011 |access-date=August 4, 2011 |title=NDRRMC Update SitRep No. 12 on Typhoon "Kabayan" (Muifa) |url=http://ndcc.gov.ph/attachments/article/257/NDRRMC%20Update%20for%20SitRep%20No%2012%20for%20TY%20KABAYAN%204%20Aug%202011%207PM.pdf |url-status=dead |archive-url=https://web.archive.org/web/20111007120637/http://www.ndcc.gov.ph/attachments/article/257/NDRRMC%20Update%20for%20SitRep%20No%2012%20for%20TY%20KABAYAN%204%20Aug%202011%207PM.pdf |archive-date=October 7, 2011 }}

|-

| Lando || {{Sort|110731|July 31 – August 2}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}}|| bgcolor=#{{storm colour|TD}}|{{Sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines || {{ntsh|0}} None|| {{ntsh|0}} None||{{cite web |title=Severe Weather Bulletin number three, Tropical Cyclone Alert: Tropical Depression "Lando" issued at 11 am, 2011-08-01 |url=http://www.pagasa.dost.gov.ph/wb/tcarchive_lando_files.html |publisher=Philippine Atmospheric, Geophysical and Astronomical Services Administration |archive-url=https://archive.today/20240523155858/https://www.webcitation.org/60bTtkUkM?url=http://dynasmon.fortunecity.com/PAGASA_backup.html |date=August 1, 2011 |archive-date=May 23, 2024 |access-date=December 27, 2011 |url-status=dead }}

|-

| Merbok || {{Sort|110802|August 2–9}} || bgcolor=#{{storm colour|STS}}|{{Sort|2|Severe tropical storm}} || bgcolor=#{{storm colour|STS}}|{{Sort|095|{{convert|95|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|STS}}|{{Sort|0980|{{convert|980|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| TD || {{Sort|110802|August 2–4}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1008|{{convert|1008|hPa|inHg|sigfig=4|abbr=on}}}} || Japan || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| 13W || {{Sort|110808|August 8–14}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| TD || {{Sort|110808|August 8–10}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1008|{{convert|1008|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None|| {{ntsh|0}}None ||

|-

| TD || {{Sort|110820|August 20–25}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None|| {{ntsh|0}}None ||

|-

| Nanmadol (Mina) || {{Sort|110821|August 21–31}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|4|Very strong typhoon}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|185|{{convert|185|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|0925|{{convert|925|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, Taiwan, China || {{ntsp|1493630000||$}} || {{nts|38}} || {{cite web|title=2011 Top 10 Philippine Destructive Tropical Cyclones (PDF)(Report)|url=http://www.ndrrmc.gov.ph/attachments/article/413/2011%20top%2010%20Phil%20Tropical%20cyclones.pdf|publisher=National Disaster Risk Reduction and Management Council|access-date=December 31, 2011|archive-date=October 17, 2012|archive-url=https://web.archive.org/web/20121017111510/http://ndrrmc.gov.ph/attachments/article/413/2011%20top%2010%20Phil%20Tropical%20cyclones.pdf|url-status=dead}}{{zwsp}}{{cite web|title=Nanmadol causes est. $200 TO $500 million in Taiwan|url=http://www.eqecat.com/catwatch/nanmadol-causes-300-to-500-million-damage-talas-hit-japan-cat-2-2011-08-30/|publisher=EQECAT|access-date=September 2, 2011}}{{zwsp}}{{cite web|title="南玛都"致福建经济损失5.32亿元 无人员伤亡|url=http://news.sohu.com/20110901/n317982623.shtml|publisher=China Press|access-date=September 1, 2011}}

|-

| Talas || {{Sort|110823|August 23 – September 5}} || bgcolor=#{{storm colour|STS}}|{{Sort|2|Severe tropical storm}} || bgcolor=#{{storm colour|STS}}|{{Sort|095|{{convert|95|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|STS}}|{{Sort|0970|{{convert|970|hPa|inHg|sigfig=4|abbr=on}}}} || Japan || {{ntsp|600000000||$}} || {{nts|82}} ||{{cite web|title=台風12号による被害状況及び消防機関の活動状況等について(第14報)|url=http://www.fdma.go.jp/bn/data/台風12号による被害状況について（第14報）.pdf|publisher=Fire and Disaster Management Agency|access-date=October 3, 2011|archive-url=https://web.archive.org/web/20180918032922/http://www.fdma.go.jp/bn/data/%E5%8F%B0%E9%A2%A812%E5%8F%B7%E3%81%AB%E3%82%88%E3%82%8B%E8%A2%AB%E5%AE%B3%E7%8A%B6%E6%B3%81%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6%EF%BC%88%E7%AC%AC14%E5%A0%B1%EF%BC%89.pdf|archive-date=September 18, 2018|url-status=dead}}

|-

| Noru || {{Sort|110902|September 2–6}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|075|{{convert|75|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|0990|{{convert|990|hPa|inHg|sigfig=4|abbr=on}}}} || None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Kulap (Nonoy) || {{Sort|110906|September 6–11}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|065|{{convert|65|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|1000|{{convert|1000|hPa|inHg|sigfig=4|abbr=on}}}} || Japan, Korea || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Roke (Onyok) || {{Sort|110908|September 8–22}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|4|Very strong typhoon}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|155|{{convert|155|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|0940|{{convert|940|hPa|inHg|sigfig=4|abbr=on}}}} || Japan || {{ntsp|1700000000||$}} || {{nts|13}} ||{{cite news|newspaper=Insurance News|author=Lai, Iris|date=December 15, 2011|url=http://insurancenewsnet.com/article.aspx?id=313927|access-date=December 18, 2011|title=Japanese Nonlife Insurers Report 1.3 Trillion Yen in Claims Related to Quake, Typhoons}}

|-

| TD || {{Sort|110913|September 13–15}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}} |{{Sort|040|Not specified}}|| bgcolor=#{{storm colour|TD}}|{{Sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || Taiwan || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Sonca || {{Sort|110914|September 14–20}} || bgcolor=#{{storm colour|TY}}|{{Sort|3|Strong typhoon}} || bgcolor=#{{storm colour|TY}}|{{Sort|130|{{convert|130|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TY}}|{{Sort|0970|{{convert|970|hPa|inHg|sigfig=4|abbr=on}}}} ||None || {{ntsh|0}} None || {{ntsh|0}} None ||

|-

| Nesat (Pedring) || {{Sort|110923|September 23–30}} || bgcolor=#{{storm colour|TY}}|{{Sort|3|Strong typhoon}} || bgcolor=#{{storm colour|TY}}|{{Sort|150|{{convert|150|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TY}}|{{Sort|0950|{{convert|950|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China, Vietnam || {{ntsp|2119000000||$}} || {{nts|98}} || {{cite report|access-date=2011-12-31|publisher=National Disaster Risk Reduction and Management Center|title=Situational Report No.26 re Typhoon "Pedring" (Nesat)|archive-date=March 26, 2012|author=Ramos, Benito T.|url-status=dead|date=2011-10-11|url=http://www.ndrrmc.gov.ph/attachments/article/306/NDRRMC%20Update%20SitRep%20No.26%20re%20Effects%20of%20Typhoon%20PEDRING%20%28NESAT%29%20as%20of%2011OCT2011,%206AM.pdf|archive-url=https://www.webcitation.org/66RU0vwsx?url=http://www.ndrrmc.gov.ph/attachments/article/306/NDRRMC%20Update%20SitRep%20No.26%20re%20Effects%20of%20Typhoon%20PEDRING%20%28NESAT%29%20as%20of%2011OCT2011%2C%206AM.pdf}}{{zwsp}}{{cite report|access-date=2011-12-31|publisher=National Disaster Risk Reduction and Management Center|url-status=live|archive-date=2012-10-17|date=2011-12-30|url=http://www.ndrrmc.gov.ph/attachments/article/413/2011%20top%2010%20Phil%20Tropical%20cyclones.pdf|title=2011 Top 10 Philippine Destructive Tropical Cyclones|archive-url=https://web.archive.org/web/20121017111510/http://ndrrmc.gov.ph/attachments/article/413/2011%20top%2010%20Phil%20Tropical%20cyclones.pdf|author=Ramos, Benito T.}}{{zwsp}}{{cite web|title="纳沙"致广东省直接经济损失增至28.6亿元|url=http://www.chinanews.com/gn/2011/10-01/3367288.shtml|agency=China Press|access-date=October 1, 2011}}{{zwsp}}{{cite web|title=台风给海南造成严重经济损失 全省转移45万余人|url=https://news.qq.com/a/20110930/001154.htm|agency=China Press|access-date=September 30, 2011}}{{zwsp}}{{cite web|title="纳沙"致广西306万人受灾 4人死亡1人失踪|url=https://news.qq.com/a/20111003/000605.htm|agency=China Press|access-date=October 3, 2011}}

|-

| Haitang || {{Sort|110924|September 24–27}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|065|{{convert|65|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|0996|{{convert|996|hPa|inHg|sigfig=4|abbr=on}}}} || China, Vietnam, Laos || {{ntsp|20000000||$}} || {{nts|25}} ||

|-

| Nalgae (Quiel) || {{Sort|110926|September 26 – October 5}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|4|Very strong typhoon}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|175|{{convert|175|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|VSTY}}|{{Sort|0935|{{convert|935|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines, China, Vietnam || {{ntsp|250000000||$}} || {{nts|18}} ||{{cite web|title=Nalgae leaves 18 dead in the Philippines |url=http://blackteacentral.com/nalgae-leaves-18-dead-in-the-philippines/ |publisher=Protect the Environment |access-date=June 4, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120416103934/http://blackteacentral.com/nalgae-leaves-18-dead-in-the-philippines/ |archive-date=April 16, 2012 }}

|-

| Banyan (Ramon) || {{Sort|111009|October 9–14}} || bgcolor=#{{storm colour|TS}}|{{Sort|1|Tropical storm}} || bgcolor=#{{storm colour|TS}}|{{Sort|065|{{convert|65|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TS}}|{{Sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || Palau, Philippines|| {{ntsp|2100000||$}} || {{nts|10}} ||

|-

| TD || {{Sort|111010|October 10–13}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1006|{{convert|1006|hPa|inHg|sigfig=4|abbr=on}}}} || China, Vietnam ||{{ntsh|0}} None|| {{ntsh|0}} None ||

|-

| 24W || {{Sort|111107|November 7–10}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|045|{{convert|45|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || None ||{{ntsh|0}} None|| {{ntsh|0}} None ||

|-

| 25W || {{Sort|111204|December 4–5}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|045|{{convert|45|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1006|{{convert|1006|hPa|inHg|sigfig=4|abbr=on}}}} || None ||{{ntsh|0}} None|| {{ntsh|0}} None ||

|-

| 26W || {{Sort|111210|December 10–14}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|TD}}|{{Sort|1004|{{convert|1004|hPa|inHg|sigfig=4|abbr=on}}}} || Philippines ||{{ntsh|0}} None|| {{nts|4}}||

|-

| Washi (Sendong) || {{Sort|111213|December 13–19}} || bgcolor=#{{storm colour|STS}}|{{Sort|2|Severe tropical storm}} || bgcolor=#{{storm colour|STS}}|{{Sort|095|{{convert|95|km/h|mph|abbr=on}}}} || bgcolor=#{{storm colour|STS}}|{{Sort|992|{{convert|992|hPa|inHg|sigfig=4|abbr=on}}}} || Caroline Islands, Philippines ||{{ntsp|97800000||$}} || {{nts|2546}} ||{{cite web|title=Tropical Cyclone Logs: Sendong (Washi) 2011|year=2011|publisher=Typhoon 2000|access-date=December 31, 2011|author=Padua, David M|url=http://www.typhoon2000.ph/stormarchives/2011/stormlogs/19sendong11_log.htm}}{{zwsp}}{{cite report|author=Ramos, Benito T |publisher=National Disaster Risk Reduction and Management Center |access-date=February 24, 2012 |url=http://www.ndrrmc.gov.ph/attachments/article/358/Final%20Report%20re%20TS%20Sendong,%2015%20-%2018%20December%202011.pdf |title=Final Report on the Effects and Emergency Management re Tropical Storm "Sendong" (Washi) |url-status=dead |archive-url=https://web.archive.org/web/20130116082551/http://www.ndrrmc.gov.ph/attachments/article/358/Final%20Report%20re%20TS%20Sendong,%2015%20-%2018%20December%202011.pdf |archive-date=January 16, 2013 }}

|-

| TD || {{Sort|111224|December 24}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || None ||{{ntsh|0}} None|| {{ntsh|0}} None ||

|-

| TD || {{Sort|111231|December 31, 2011 – January 1, 2012}} || bgcolor=#{{storm colour|TD}}|{{Sort|0|Tropical depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|040|Not specified}} || bgcolor=#{{storm colour|TD}}|{{Sort|1008|{{convert|1008|hPa|inHg|sigfig=4|abbr=on}}}} || Malaysia ||{{ntsh|0}} None|| {{ntsh|0}} None ||

|-

{{TC Areas affected (Bottom)|TC's=39 systems|dates=April 1, 2011 –
January 1, 2012|winds={{convert|195|km/h|mph|abbr=on}}|pres={{convert|920|hPa|inHg|sigfig=4|abbr=on}}|damage={{ntsp|7475556000||$}}| deaths=3,111|Refs=}}

{{Portal|Tropical cyclones}}

• Tropical cyclones in 2011
• List of Pacific typhoon seasons
• 2011 Pacific hurricane season
• 2011 Atlantic hurricane season
• 2011 North Indian Ocean cyclone season
• South-West Indian Ocean cyclone seasons: 2010–11, 2011–12
• Australian region cyclone seasons: 2010–11, 2011–12
• South Pacific cyclone seasons: 2010–11, 2011–12
• South Atlantic tropical cyclone

{{reflist|group=nb}}

{{Reflist|2}}

{{Commons category}}

{{WPAC EL's}}

{{2011 Pacific typhoon season buttons}}

{{TC Decades|Year=2010|basin=Pacific|type=typhoon}}

{{Tropical cyclone season|2011}}

{{DEFAULTSORT:2011 Pacific Typhoon Season}}

Category:Articles which contain graphical timelines

Category:Pacific typhoon seasons

2011 WPac