2009–10 South-West Indian Ocean cyclone season#Tropical Cyclone Imani

{{Infobox hurricane small

|Basin=SWI

|Formed=August 18

|Dissipated=August 20

|10-min winds=20

|Image=01R 2009-08-18 0815Z.jpg

|Track=01R 2009 track.png

|Pressure=1004

}}

Early on August 17, the JTWC reported that an area of disturbed weather had formed about 1200 kilometres, (750 miles), to the east of Diego Garcia.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/GuamStuff/2009081711-ABIO.PGTW|title=Significant Tropical Weather Advisory for the Indian Ocean 2009-08-17 11z|date=2009-08-17|publisher=Joint Typhoon Warning Center|access-date=2009-08-18}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} The convection had a developed low level circulation center, however convection had not started to consolidate around it and was in an area of strong vertical wind shear. During that day the disturbance gradually developed further as the environment around it gradually improved and was designated as Tropical Disturbance 01 by RSMC La Réunion early the next day.{{cite web|date=2009-08-17|access-date=2009-08-18|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/GuamStuff/2009081718-ABIO.PGTW|title=Significant Tropical Weather Advisory for the Indian Ocean 2009-08-18 18z|publisher=Joint Typhoon Warning Center}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }}{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009081802-FMEE|title=RSMC Tropical Cyclone Bulletin 2009-08-18 00z|date=2009-08-18|publisher=Météo-France|access-date=2009-08-18}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} However, later that day they downgraded it to a zone of disturbed weather and released their final advisory on the disturbance as it had remained weak with the low level circulation center remaining weak and exposed.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009081812-FMEE|title=RSMC Technical Bulletin 2009-08-18 12z|date=2009-08-18|publisher=Météo-France|access-date=2009-08-18}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} Over the next few days it weakened further before dissipating on August 20.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/GuamStuff/2009082018-ABIO.PGTW|title=Significant Tropical Weather Advisory for the Indian Ocean 2009-08-20 18z|date=2009-08-20|publisher=Joint Typhoon Warning Center|access-date=2009-08-20}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=September 18

|Dissipated=September 20

|Type1=ZODW

|WarningCenter=MFR

|10-min winds=20

|Image=02R Sep 20 2009 0427Z.jpg

|Track=02R 2009 track.png

|Pressure=1008

}}

During September 17, both TCWC Jakarta and the JTWC reported that an area of convection had persisted about {{convert|740|km|mi|abbr=on}}, to the south east of Sumatra in Indonesia.{{cite web|url=http://maritim.bmg.go.id/cyclones/IDJ22300.txt |title=Tropical Weather Outlook: 2009-09-16 06z |date=2009-09-16 |publisher=Indonesian Agency for Meteorology, Climatology and Geophysics |access-date=2009-09-18 |language=id |url-status=dead |archive-url=https://web.archive.org/web/20090429053329/http://maritim.bmg.go.id/cyclones/IDJ22300.txt |archive-date=April 29, 2009 }}{{cite web|url=http://metocph.nmci.navy.mil/jtwc/ab/abioweb.txt |title=Significant Tropical Weather Advisory for the Indian Ocean 2009-09-16 11z |date=2009-09-16 |publisher=Joint Typhoon Warning Center |access-date=2009-09-18 |url-status=dead |archive-url=https://web.archive.org/web/20090414140019/http://metocph.nmci.navy.mil/jtwc/ab/abioweb.txt |archive-date=April 14, 2009 }} Satellite imagery was showing that the convection was slowly starting to consolidate with a well defined low level circulation centre off the western coast of Sumatra. However it was not expected to develop any further due to being in area of high vertical wind shear in excess of {{convert|40|kn|km/h}}. Despite this it was designated as a tropical low early the next day by TCWC Perth.{{cite web|url=http://dynasmon.fortunecity.com/Perth.html |title=TCWC Perth Tropical Cyclone Outlook for the Central Indian Ocean 2009-09-17 0400z |date=2009-09-17 |publisher=Bureau of Meteorology (Australia) |access-date=2009-09-18 |url-status=dead |archive-url=https://web.archive.org/web/20090726132921/http://dynasmon.fortunecity.com/Perth.html |archive-date=July 26, 2009 }} The JTWC then declared early the next day that the disturbance had dissipated as it crossed 90E and moved into RSMC La Réunion's area of responsibility.{{cite web|url=http://metocph.nmci.navy.mil/jtwc/ab/abioweb.txt |title=Significant Tropical Weather Advisory for the Indian Ocean 2009-09-18 11z |date=2009-09-18 |publisher=Joint Typhoon Warning Center |access-date=2009-09-18 |url-status=dead |archive-url=https://web.archive.org/web/20090414140019/http://metocph.nmci.navy.mil/jtwc/ab/abioweb.txt |archive-date=April 14, 2009 }}{{cite web|url=http://199.9.2.143/tcdat/tc10/SHEM/91S.INVEST/trackfile.txt|archive-url=https://web.archive.org/web/20180103154805/http://199.9.2.143/tcdat/tc10/SHEM/91S.INVEST/trackfile.txt|url-status=dead|archive-date=2018-01-03|title=Operational Best Track Details for 91S Invest|date=2009-09-16|work=Joint Typhoon Warning Center|publisher=United States Naval Research Laboratory|access-date=2009-09-18}} TCWC Perth continued to monitor the tropical low as it slowly developed further until early on September 20 when RSMC La Réunion designated it as the second Zone of Disturbed Weather of the 2009–10 as convection had developed over the system and the amount of vertical wind shear over the system had dropped.{{cite web|url=http://www.geocities.com/rattleman123456/IDW10900.htm |title=Tropical Cyclone Outlook for the Central Indian Ocean |date=2009-09-20 |publisher=Bureau of Meteorology (Australia) |access-date=2009-12-12 |url-status=dead |archive-url=https://web.archive.org/web/20161004150949/http://www.geocities.com/rattleman123456/IDW10900.htm |archive-date=October 4, 2016 }}{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009092007-FMEE|title=RSMC La Reunion Tropical Cyclone Warning 2009-09-20 06z|date=2009-09-20|publisher=Météo-France|access-date=2009-12-12}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} However, they released their final advisory later that day, as convection had dissipated in the northern quadrants of the system.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009092013-FMEE|title=RSMC La Reunion Tropical Cyclone Warning 2009-09-20 12z|date=2009-09-20|publisher=Météo-France|access-date=2009-12-12}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=November 7

|Dissipated=November 10

|10-min winds=25

|Image=03R 7 November 2009.jpg

|Track=03R 2009 track.png

|Pressure=1002

}}

Early on November 7, the JTWC issued a Tropical Cyclone Formation Alert on a system north of Diego Garcia. Later that day, RSMC La Réunion upgraded the system to a tropical disturbance. Despite forecasts that the system would strengthen to a depression, it was substantially affected by shear, and as a result, the JTWC cancelled their TCFA on November 9. {{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=November 13

|Dissipated=November 18

|10-min winds=90

|1-min winds=105

|Image=Anja 2009-11-15 0520Z.jpg

|Track=Anja 2009 track.png

|Pressure=950

}}

RSMC La Réunion commenced advisories on Tropical Disturbance 04 on November 14, raising the status to a Tropical Depression later the same day. At the time of formation, it was some {{convert|390|mi|km|abbr=on}} south of Diego Garcia. Throughout that day, and into the 15th, Anja rapidly intensified from a severe tropical storm to a tropical cyclone on the MFR scale and a Category 3-equivalent cyclone on the Saffir–Simpson hurricane scale (SSHS), while remaining well away from land. The system displayed annular characteristics and was very small; its diameter was {{convert|60|nmi|km}} and it displayed a pinhole eye.{{cite web|url=http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt |title=JTWC Warning 07 for Tropical Cyclone 01S (Anja) |date=November 17, 2009 |publisher=Joint Typhoon Warning Center |access-date=2009-11-17 |url-status=dead |archive-url=https://web.archive.org/web/20090717084700/http://weather.noaa.gov/pub/data/raw/wt/wtxs31.pgtw..txt |archive-date=July 17, 2009 }} The storm peaked at a Category 3-equivalent intensity and held its strength until November 17 when the storm rapidly weakened to a tropical storm. Final advisories were issued on November 18 as the system weakened to a depression and became extratropical.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=November 22

|Dissipated=November 25

|10-min winds=40

|1-min winds=40

|Pressure=996

|Image=Bongani Nov 22 2009 0955Z.jpg

|Track=Bongani 2009 track.png

}}

On November 22, RSMC La Réunion commenced issuing advisories for Tropical Disturbance 05 about {{convert|500|mi|km|abbr=on}} northeast of Madagascar. The next day it strengthened to a Moderate Tropical Storm and was named 'Bongani'. On November 23–24, the system remained small sized and was undergoing a temporarily southeasterly constraint. According to CIMSS data (MIMIC-TPW), the dry air that was to the southwest of the system interfered with circulation of the system and temporarily limited the intensification rate. On the morning of November 24, Bongani rapidly weakened into a tropical disturbance.

The remnants of Bongani brought unsettled weather to the Mayotte Islands. Moderate rains affected the region between November 26 and 27; waves associated with the storm also averaged {{convert|3|m|ft|abbr=on}} along coastal areas with some reaching {{convert|6|m|ft|abbr=on}}.{{cite web|author=Staff Writer|publisher=Mayotte Hebdo|date=November 26, 2009|access-date=December 9, 2009|title=Bongani apporte la pluie|url=http://www.mayottehebdo.com/content/view/1835/47/|language=fr|archive-url=https://web.archive.org/web/20140203104944/http://www.mayottehebdo.com/content/view/1835/47/|archive-date=2014-02-03|url-status=dead}} In the nearby Comoros Islands, waves were similarly high, with the highest reaching {{convert|5|m|ft|abbr=on}}.{{cite web|author=Hakim Ahamed Zoubeiri|publisher=Actualité des Iles Comoros|date=November 26, 2009|access-date=December 19, 2009|title=Ex-Bongani : pluie, orage et houle sur les Comores|url=http://zoubeiri.unblog.fr/2009/11/26/ex-bongani-pluie-orage-et-houle-sur-les-comores/|language=fr|archive-url=https://web.archive.org/web/20110721022834/http://zoubeiri.unblog.fr/2009/11/26/ex-bongani-pluie-orage-et-houle-sur-les-comores/|archive-date=2011-07-21|url-status=dead}}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=December 6

|Dissipated=December 14

|10-min winds=105

|1-min winds=115

|Pressure=930

|Track=Cleo 2009 track.png

|Image=Cleo.A2009342.0525.250m.jpg

}}

On December 6, a strong tropical disturbance 06 newly formed in the central Indian Ocean. The storm was expected to strengthen slowly, however, the next day, the disturbance strengthened into a severe tropical storm while being given a designation as Tropical Cyclone 03S by the JTWC. On 8 December it strengthened rapidly to become the first Intense Tropical Cyclone of the season and a Category 4-equivalent cyclone on the Saffir–Simpson hurricane scale (SSHS). It sustained this strength for a day peaked at a Category 4-equivalent intensity and held its strength as a high strong category 4-equivalent, then on the 10th slowly weakened to a category 2 equivalent cyclone. The weakening continued steadily, and the final advisory was issued on December 12 when the remnants were {{convert|370|mi|km}} north of Rodrigues. Later that day, the remnants of Ex-Cleo regenerated to a tropical depression, but it weakened to a tropical disturbance and dissipated on December 14.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=December 12

|Dissipated=December 25

|10-min winds=45

|1-min winds=55

|Pressure=987

|Track=David_2009_track.png

|Image=David_21_December_2009.jpg

}}

On December 12, a zone of disturbed weather formed in the Southern Indian Ocean near the border with the Australian region. The next day the RSMC classified it as Tropical Disturbance 07, and JTWC as Tropical Cyclone 05S, but its movement to cooler water and higher levels of wind shear weakened the tropical system on the 14th. The remnants continued to show a Low level Circulation Centre accompanied by flaring convection as they headed west or northwest, and the organisation began to improve again on the 19th.

{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/GuamStuff/2009121909-ABIO.PGTW|title=Significant Tropical Weather Advisory for the Indian Ocean|date=December 19, 2009|publisher=Joint Typhoon Warning Center|access-date=2009-12-19}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} It continued to organize throughout the next day, and by the 21st of December it was named Moderate Tropical Storm David by the Mauritius Meteorological Service.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009122112-FMEE|title=Moderate Tropical Storm 7 (David) Warning 09|date=December 21, 2009|publisher=Météo-France|access-date=2009-12-21}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} It then reversed its direction of motion and headed east-southeast while strengthening to a Severe Tropical Storm.{{cite web|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Seychelles/2009122218-FMEE|title=Severe Tropical Storm 14 (David) Warning 14|date=December 22, 2009|publisher=Météo-France|access-date=2009-12-22}}{{Dead link|date=September 2018 |bot=InternetArchiveBot |fix-attempted=yes }} Its strength fluctuated for the next few days, and by Christmas Day it was moving very little and windshear weakened it to a Tropical Disturbance. The final advisory from the RSMC was issued on December 25, although the remnant continued to produce bursts of poorly organized convection for several days as it reversed direction again and headed west.

In post-season analysis, David was downgraded to a Moderate Tropical Storm as winds were reassessed to have never exceeded {{convert|85|km/h|mph|abbr=on|round=5}}.

On December 29, the remnants of David brought heavy rain to the islands of Mauritius and Réunion. Most of Mauritius recorded over {{convert|100|mm|in|abbr=on}} of rain within a 24-hour span, with a maximum of {{convert|146.2|mm|in|abbr=on}} in Mon Loisir Rouillard. Widespread flash flooding took place across the island, resulting in over 20 calls to firefighters for rescue. Officials deployed special mobile forces in several cities due to the risk of increased flooding.{{cite web|author=Julien Tuyau|publisher=La Sentinelle|date=December 29, 2009|access-date=December 29, 2009|title=Pluies diluviennes: les pompiers et la Special Mobile Force en état d'alerte|url=http://www.lexpress.mu/story/8593-pluies-diluviennes-les-pompiers-et-la-special-mobile-force-en-etat-d-alerte.html|language=fr|archive-url=https://web.archive.org/web/20110719042048/http://www.lexpress.mu/story/8593-pluies-diluviennes-les-pompiers-et-la-special-mobile-force-en-etat-d-alerte.html|archive-date=2011-07-19|url-status=dead}}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=January 4 (Entered basin)

|Dissipated=January 14

|10-min winds=120

|1-min winds=140

|Image=Edzani 07 jan 2010 0825Z.jpg

|Track=Edzani_2010_track.png

|Pressure=910

}}

Tropical Low 03U of the Australian Region crossed the 90ºE meridian on 4 January and was designated Tropical Disturbance 8 by RSMC La Réunion. The system showed two low-level circulation centres for a while, but on 5 January these consolidated, and the combination was upgraded to a Tropical Depression. At 0300 UTC on January 6, the JTWC starts issuing advisories designating the system as 07S, and shortly thereafter the RSMC upgraded it to Moderate Tropical Storm Edzani. Early on January 7, RSMC La Réunion upgraded Edzani to a Severe Tropical Storm, and it strengthened rapidly throughout the day to become an Intense Tropical Cyclone. The next day it became a Very Intense Tropical Cyclone and category 5 (1 min 260 kmh) by JTWC, the first since Juliet in April 2005. On January 9, Edzani was downgraded to an Intense Tropical Cyclone due to decreasing sea surface temperatures. It continued to weaken during the day, as sea surface temperatures continued to decrease. By January 10, it was only a Tropical Cyclone, and within the next few days it weakened to Moderate Tropical Storm strength. The RSMC classified it as a subtropical cyclone by January 12, although JTWC treated it as tropical for 2 days longer.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Formed=January 15

|Dissipated=January 16

|10-min winds=25

|Image=09R_13_January_2010.jpg

|Track=09R 2010 track.png

|Pressure=1005

}}

An area of disturbed weather, first observed over the Mozambique Channel around 8 January, moved across northern Madagascar and into the Indian Ocean where it displayed occasional bursts of convection. On 15 January the LLCC improved in organisation, and the RSMC designated it as a Tropical Disturbance {{convert|245|nmi|km|abbr=on}} to the west-southwest of La Réunion. The next day, RSMC La Réunion issued their final advisory on the system as the center was ill-defined.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Type1=subdepression

|Formed=January 25

|Dissipated=January 31

|10-min winds=35

|1-min winds=35

|WarningCenter=MFR

|Image=10R 27 January 2010.jpg

|Track=11-S_2010_track.png

|Pressure=995

}}

On January 26, RSMC La Réunion announced that a Zone of Disturbed Weather had formed about {{convert|350|mi|km}} NNE of Mauritius. Next day this was raised to a Tropical Disturbance, and JTWC designated is as Tropical Cyclone 11S based on 1-minute wind strength. By January 29 it displayed hybrid characteristics and was classified as a subtropical depression, although the maximum winds reached storm strength.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Fami 02 feb 2010 1040Z.jpg

|Formed=February 1

|Dissipated=February 3

|10-min winds=45

|1-min winds=40

|Track=Fami 2010 track.png

|Pressure=990

}}

On February 1, RSMC La Réunion commenced issuing advisories for Tropical Disturbance 11 in the Mozambique Channel. On February 2 it strengthened to a Moderate Tropical Storm and was named Fami. Shortly after this it made landfall on the western Malagasy coast and weakened rapidly to a depression. Fami dissipated on February 2.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Tropical Cyclone Gelane 2010-02-19 lrg.jpg

|Formed=February 15

|Dissipated=February 22

|10-min winds=110

|1-min winds=125

|Track=Gelane 2010 track.png

|Pressure=930

}}

On February 15, the RSMC announced the formation of Tropical Disturbance 12 approximately {{convert|650|nmi|km|abbr=on}} NNE of La Réunion. Hours later it was classified as Moderate Tropical Storm Gelane. It reached Tropical Cyclone strength briefly on February 17, but quickly weakened to a Severe Tropical Storm. Then on February 18, it restrengthened back into a Tropical Cyclone, eventually becoming an Intense Tropical Cyclone. It remained a small system and weakened rapidly as wind shear effects increased.

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Tropical Cyclone Hubert 2010-03-10 lrg.jpg

|Formed=March 7

|Dissipated=March 15

|10-min winds=55

|1-min winds=50

|Track=Hubert 2010 track.png

|Pressure=985

}}

{{Main|Tropical Storm Hubert}}

On March 9, a tropical disturbance formed between Madagascar and Réunion. On March 10 it strengthened to a tropical storm and was named Hubert by the meteorological service of Madagascar. It strengthened to a severe tropical storm as it approached the Madagascar coast, and made landfall north of Mananjary. At least ten people were killed by the storm and 32,000 others were affected throughout Madagascar.{{Cite web|url=http://breakingnews.iol.ie/news/world/tropical-storm-kills-10-in-madagascar-449731.html|archive-url=https://archive.today/20120708225717/http://breakingnews.iol.ie/news/world/tropical-storm-kills-10-in-madagascar-449731.html|url-status=dead|archive-date=2012-07-08|title=Tropical storm kills 10 in Madagascar | BreakingNews.ie}} Later reports confirmed that four other people had been killed and two more were missing. Nearly 38,000 people were left homeless by flooding triggered by torrential rains from the storm.{{Cite web |url=http://www.google.com/hostednews/afp/article/ALeqM5jGxY7mebgfTtuWSpUMlUzqcgrcpA |title=AFP: Tropical storm Hubert leaves 14 dead in Madagascar |access-date=2010-03-14 |archive-date=2010-03-17 |archive-url=https://web.archive.org/web/20100317191741/http://www.google.com/hostednews/afp/article/ALeqM5jGxY7mebgfTtuWSpUMlUzqcgrcpA |url-status=dead }}

{{Clear}}

{{Infobox hurricane small

|Basin=SWI

|Image=Imani 2010-03-25 0750Z.jpg

|Formed=March 20

|Dissipated=March 28

|10-min winds=70

|1-min winds=80

|Track=Imani 2010 track.png

|Pressure=965

}}

Tropical Disturbance 14 formed on 22 March in the far east of the SW Indian Ocean basin, close to 90ºE. Although the precursor disturbance had been drifting eastwards, TD 14 was predicted to remain in this basin and not move into the Australian. It became a tropical depression later the same day, and was upgraded to Moderate Tropical Storm Imani on 23 March and a Severe Tropical Storm the next day. It continued to strengthen as it moved southwards, and reached tropical cyclone strength on 25 March. It started to dissipate on March 26, and La Réunion had stopped releasing advisories on Imani at 1200z, March 26.

{{Clear}}

{{Infobox tropical cyclone small

|Basin=SWI

|Formed=April 7

|Dissipated=April 7

|Image=Robyn 2010-04-05 0735Z.jpg

|Track=Robyn 2010 track.png

|10-min winds=30

|1-min winds=30

|Pressure=1002

}}

The remnants of Cyclone Robyn crossed into this basin on 7 April as a Filling Depression, and a single advisory was issued by RSMC La Réunion.

{{Clear}}

{{Infobox tropical cyclone small

|Basin=SWI

|Type1=subdepression

|Type2=subtropical

|Formed=May 26

|Dissipated=May 29

|WarningCenter=MFR

|Image=Joel May 26 2010 1120Z.jpg

|Track=Joel 2010 track.png

|10-min winds=60

|1-min winds=45

|Pressure=990

}}

An area of convection southwest of Madagascar was designated Subtropical Depression 16 by RSMC La Réunion on 26 May. The small system strengthened rapidly and was soon named Joël, although still classified as a Subtropical Depression. NASA also considered the storm to have been subtropical, attaining peak one-minute sustained winds of {{convert|85|km/h|mph|abbr=on|round=5}}.[http://www.nasa.gov/mission_pages/hurricanes/archives/2010/h2010_joel.html NASA.gov]

{{Clear}}

Tropical disturbances are named upon reaching moderate tropical storm strength.{{cite web|url=http://www.wmo.ch/web/www/TCP/OperationPlans/TCP-12%20Edition%202006-English.pdf |title=Tropical cyclone Operational Plan for the Southwest Indian Ocean |year=2006 |publisher=World Meteorological Organisation |access-date=2009-08-18 |url-status=dead |archive-url=https://web.archive.org/web/20060921213201/http://www.wmo.ch/web/www/TCP/OperationPlans/TCP-12%20Edition%202006-English.pdf |archive-date=September 21, 2006 }} If a tropical disturbance reaches this intensity west of 55°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Madagascar assigns the appropriate name to the storm. If it reaches moderate tropical storm strength between 55°E and 90°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius names the storm. A new list of names is drawn up and used each year, so no names are retired. The names for this season are as follows:{{cite web|url=http://www.meteo.fr/temps/domtom/La_Reunion/TGPR/saison/Liste_NomsBapteme.html|title=Tropical Cyclone Names 2009–10|date=2009-08-13|access-date=2009-08-18|archive-url=https://web.archive.org/web/20080915105012/http://www.meteo.fr/temps/domtom/La_Reunion/TGPR/saison/Liste_NomsBapteme.html|archive-date=2008-09-15|url-status=dead}}

This table lists all the storms that developed in the Southern Hemisphere during the 2009–2010 South-West Indian Ocean cyclone season. It includes their intensity, duration, name, landfalls, deaths, and damages. All data is taken from Météo-France. The damage figures are all from 2009 USD.

{{Portal|Tropical cyclones}}

• Tropical cyclones in 2009 and 2010
• South-West Indian Ocean tropical cyclone
• List of Southern Hemisphere cyclone seasons
• Atlantic hurricane seasons: 2009, 2010
• Pacific hurricane seasons: 2009, 2010
• Pacific typhoon seasons: 2009, 2010
• North Indian Ocean cyclone seasons: 2009, 2010
• 2009–10 Australian region cyclone season
• 2009–10 South Pacific cyclone season

{{Reflist|2}}

• [http://www.usno.navy.mil/JTWC Joint Typhoon Warning Center (JTWC)] {{Webarchive|url=https://web.archive.org/web/20100301105349/http://www.usno.navy.mil/JTWC |date=2010-03-01 }}.
• [https://web.archive.org/web/20100907040600/http://www.meteo.fr/temps/domtom/La_Reunion/TGPR/actif/activite_en_cours.html Météo France (RSMC La Réunion)].
• [https://web.archive.org/web/20070421094952/http://www.wmo.int/index-en.html World Meteorological Organization]

{{2009–10 South-West Indian Ocean cyclone season buttons}}

{{Tropical cyclone season|2009|split-year=y}}

{{TC Decades|Year=2000|basin=South-West Indian Ocean|type=cyclone|shem=yes}}

{{DEFAULTSORT:2009-10 South-West Indian Ocean Cyclone Season}}

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Category:Articles which contain graphical timelines

Category:South-West Indian Ocean cyclone seasons

2009 SWIO

2010 SWIO