1964 Pacific hurricane season

With only six named storms, the season was well below the 1949–2006 average of 13 named storms and is the second fewest storms in the hurricane database, only behind the 1953 Pacific hurricane season, in which just 5 storms were observed.{{Tropical Cyclones of the Eastern North Pacific Basin, 1949-2006}} Moreover, 1964 is the least active season since the satellite era began in the basin in 1961.{{EPAC hurricane best track}}{{cite conference|title=Re-analysis of the Eastern North Pacific HURDAT|author2=Department of Commerce|author3=National Hurricane Center|publisher=American Meteorological Society|author=Todd Kimberlain|date=April 16, 2012}} Of the six storms that formed, three formed in July, two developed in August, and the final storm of the year existed in early to mid-September. Only two tropical cyclones reached hurricane status, compared to the modern-day average of seven. Furthermore, 1964 is also one of the few seasons without a major hurricane. This season was part of a decade-long absence of major hurricanes; during the 1960s, only one major hurricane was observed and none were noted from 1960–1966. However, it is possible that some storms were missed due to the lack of satellite coverage in the region; at that time, satellite data was still scarce, and 1964 is still two years shy of the start of the geostationary satellite era, which began in 1966.{{Tropical Cyclones of the Eastern North Pacific Basin, 1949-2006}} Some efforts are underway to improve the records for this time period; however, this process will likely take years to complete. Also, the Pacific Decadal Oscillation (PDO) was in the midst of a cold phase during this time period, which tends to suppress Pacific hurricane activity.{{cite web|title=Variability of rainfall from tropical cyclones in Northwestern Mexico|url=http://www.ejournal.unam.mx/atm/Vol21-2/ATM002100206.pdf|publisher=Atmosfera|accessdate=October 30, 2011|pages=8|year=2008|archive-url=https://web.archive.org/web/20150616061921/http://www.ejournal.unam.mx/atm/Vol21-2/ATM002100206.pdf|archive-date=June 16, 2015|url-status=dead}}{{cite journal|author1=Franco Biondi |author2=Alexander Gershunov |author3=Daniel R. Cayan |year=2001 |title=North Pacific Decadal Climate Variability since 1661 |journal=Journal of Climate |volume=14 |issue=1 |pages=5–10 |doi=10.1175/1520-0442(2001)014<0005:NPDCVS>2.0.CO;2 |url=http://www.ngdc.noaa.gov/paleo/pubs/biondi2001/biondi2001.html|archive-url=https://web.archive.org/web/20010306111901/http://www.ngdc.noaa.gov/paleo/pubs/biondi2001/biondi2001.html|url-status=dead|archive-date=March 6, 2001|accessdate=January 27, 2013|bibcode=2001JCli...14....5B|doi-access=free }} During the season, tropical cyclone advisories were issued by the Naval Fleet Warning Central (NFWC) in Alameda, which held responsibility for the basin until 1970.{{Tropical Cyclones of the Eastern North Pacific Basin, 1949-2006}}

{{Infobox Hurricane Small

|Basin=EPac

|Image=Natalie 1964 track.png

|Formed=July 6

|Dissipated=July 7

|1-min winds=45

|Pressure=1001

}}

On July 5, the ship California Star recorded winds of {{convert|35|mph|km/h|abbr=on|round=5}} and a barometric pressure of {{convert|1005.8|mb|inHg|abbr=on|lk=on|0}};{{cite report|author=McGurrin, Martin|type=Mariners Weather Log: Volume 9, Issue 2: March 1964|year=1964|title=Tropical Cyclones in the Eastern Pacific 1964|publisher=United States Weather Bureau|pages=42–45|editor=Rosendal, Hans E}} consequently, the storm was upgraded into Tropical Storm Natalie. After passing through the Tres Marinas Islands just offshore, Natalie attained its peak intensity of {{convert|80|mph|km/h|abbr=on|round=5}} (making Natalie a Category 1 hurricane on the present-day Saffir-Simpson Hurricane Wind Scale) and a peak pressure of {{convert|1001|mb|inHg|abbr=on}}, though the Pacific hurricane database does not show the storm getting any stronger than {{convert|50|mph|km/h|abbr=on|round=5}}. The next day, July 7, the NFWC reported that Natalie made landfall near Mazatlan with winds of {{convert|50|mph|km/h|abbr=on|round=5}} just before dissipating. No known impact was recorded.

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{{Infobox Hurricane Small

|Basin=EPac

|Image=Hurricane Odessa 16 Jul 1964 TIROS VIII.png

|Track=Odessa 1964 track.png

|Formed=July 15

|Dissipated=July 19

|1-min winds=85

|Pressure=986

|Pressurepost=http://www.ncdc.noaa.gov/IPS/cdns/cdns.html

}}

Hurricane Odessa formed on July 15. The storm quickly intensified and was believed to have attained peak intensity of {{convert|100|mph|km/h|abbr=on|round=5}}, making Odessa a Category 2 hurricane on the Saffir-Simpson Hurricane Wind Scale. After moving west, Odessa steadily weakened, and by July 18, the winds had decreased to {{convert|40|mph|km/h|abbr=on|round=5}}. Later on July 18, it turned towards the northwest, and shortly thereafter, the hurricane turned towards the west-southwest. Odessa quickly re-intensified, and according to ship reports, the storm attained winds of {{convert|70|mph|km/h|abbr=on|round=5}}. Odessa dissipated at 1800 UTC on July 19. Even though the storm was about {{convert|250|mi|km|abbr=on|round=5}} south of Socorro Island at the time of its formation, tropical cyclone warnings and watches were posted for the island.

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{{Infobox Hurricane Small

|Basin=EPac

|Image=Prudence 1964 track.png

|Formed=July 20

|Dissipated=July 24

|1-min winds=60

|Pressure=1000

|Pressurepost=http://www.ncdc.noaa.gov/IPS/cdns/cdns.html

}}

Near the area where Odessa developed, a mid-level tropical storm formed early on July 20 and it was named Prudence, despite ships in the vicinity of the storm reporting winds of {{convert|35|mph|km/h|abbr=on|round=5}}. Moving generally west-northwest, Prudence initially failed to intensify, and maintained winds of 50 mph (85 km/h) for a few days. After briefly turning west on July 22, Prudence resumed a west-northwest course while attaining its peak wind speed of {{convert|70|mph|km/h|abbr=on|round=5}}. Prudence held on to this intensity until July 23, when it encountered cooler sea surface temperatures. Shortly before dissipating, the system turned back towards the west. Tropical Storm Prudence dissipated on July 24. Even though Prudence never made landfall, the cyclone produced high waves along the California coast, especially along Newport Beach.{{cite news|title=Towering surf hits California|newspaper=Tri-City Herald|date=July 21, 1964|page=1A}}

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{{Infobox Hurricane Small

|Basin=EPac

|Image=Roslyn 1964 track.png

|Formed=August 21

|Dissipated=August 22

|1-min winds=55

|Pressure=1006

|Pressurepost=http://www.ncdc.noaa.gov/IPS/cdns/cdns.html

}}

A tropical depression formed on August 21. Later that day, the NFWC upgraded the depression into a tropical storm, and was named Roslyn, with winds of {{convert|50|mph|km/h|abbr=on|round=5}}. At the time of the upgrade, Tropical Storm Roslyn was located roughly {{convert|500|mi|km|abbr=on|round=5}} south-southwest of Cabo San Lucas. After passing east of Clarion Island during the evening hours of September 20, Roslyn attained its peak strength of {{convert|65|mph|km/h|abbr=on|round=5}}, making Roslyn a strong tropical storm. While maintaining its intensity, Roslyn drifted west-northwest. The storm dissipated at 1800 UTC on August 22.

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{{Infobox Hurricane Small

|Basin=EPac

|Image=File:Silvia 1964 track.png

|Formed=August 23

|Dissipated=August 24

|1-min winds=30

|Pressure=1006

|Pressurepost=http://www.ncdc.noaa.gov/IPS/cdns/cdns.html

}}

Tropical Depression Silvia was first noted by the NFWC on August 23 about {{convert|60|mi|km|abbr=on|round=5}} south of Mazatlan, with winds of {{convert|50|mph|km/h|abbr=on|round=5}}. After tropical cyclogenesis, the storm quickly weakened. Simultaneously, Silvia moved westward, passing about {{convert|60|mi|km|abbr=on|round=5}} south of Cabo San Lucas. By August 24, the NFWC had stopped monitoring the system. The depression was named by the NFWC as it resembled to be a tropical storm. However, post-storm analysis show that Silvia never attained tropical storm status.

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{{Infobox Hurricane Small

|Basin=EPac

|Image=Tillie Sept 7 1964 0734Z.png

|Track=Tillie 1964 track.png

|Formed=September 7

|Dissipated=September 9

|1-min winds=50

|Pressure=1000

|Pressurepost=http://www.ncdc.noaa.gov/IPS/cdns/cdns.html

}}

The last tropical cyclone of the season, Tropical Storm Tillie, developed on September 7. At first, the cyclone moved north-northwest; Tillie reached its peak intensity of {{convert|60|mph|km/h|abbr=on|round=5}} at that time of its formation approximately {{convert|150|mi|km|abbr=on|round=5}} west of Mazatlan. Early on September 8, while located about {{convert|100|mi|km|abbr=on}} southwest of Cabo San Lucas, Tillie began a gradual turn towards the west-northwest. Tropical Storm Tillie dissipated at 0600 UTC on September 9 off the coast of California,{{cite news|title=Tilie Is Weakening Off Of California|url=https://news.google.com/newspapers?id=sIBPAAAAIBAJ&pg=4354,1504747&dq=tropical+storm+tillie&hl=en|accessdate=June 14, 2013|newspaper=Ocala Star-Banner|date=September 9, 1964|agency=Associated Press|page=6}} having only been a tropical cyclone for just over two days.

When Tillie posed a threat to Baja California, winds of {{convert|40|mph|km/h|abbr=on|round=5}} were forecast to occur.{{cite news|title=Tropical Storm Tillie Weakens|url=https://news.google.com/newspapers?id=_95NAAAAIBAJ&pg=6218,6464536&dq=tropical+storm+tillie&hl=en|accessdate=June 14, 2013|newspaper=The Free Lance|date=September 9, 1962|page=2}} The storm's residual moisture was adverted over southern Arizona, allowing a passing cold front to trigger widespread showers and thunderstorms on the evening of September 9.{{cite web|author=U.S. Army Corps of Engineers |title=Santa Cruz River, Paseo de las Iglesias (Pima County, Arizona) Final Feasibility Report and Environmental Impact Statement |publisher=USACE |accessdate=July 21, 2011 |url=http://rfcd.pima.gov/largefiles/pdli2/appxa.pdf |url-status=dead |archiveurl=https://web.archive.org/web/20110929181403/http://rfcd.pima.gov/largefiles/pdli2/appxa.pdf |archivedate=September 29, 2011 }} The most significant rainfall was reported along southeastern Arizona, southern New Mexico, and around El Paso.{{cite journal|title=The Effects of Tropical Cyclones on the Southwestern United States|journal=NOAA Technical Memorandum|date=August 1986|url=http://docs.lib.noaa.gov/noaa_documents/NWS/NWS_WR/TM_NWS_WR_197.pdf|accessdate=June 4, 2013|publisher=National Weather Service Western Region}} Amado sustained {{convert|5.66|in|mm|abbr=on}} in a 72‑hour time span. Furthermore, Tucson received {{convert|3.05|in|mm|abbr=on}} of rainfall in a 24-hour period between September 9–10,{{cite journal|last=Green|first=Raymond A.|title=The Weather and Circulation of September 1964|journal=Monthly Weather Review|date=December 1964|volume=92|issue=12|pages=601–606|doi=10.1175/1520-0493(1964)092<0601:TWACOS>2.3.CO;2|bibcode = 1964MWRv...92..601G |doi-access=free}} and two locations—one in the Catalina Mountain foothills and one near Sahuarita—recorded {{convert|6.75|in|mm|abbr=on}} of precipitation. Coupled with rain during the previous week, the Santa Cruz River produced heavy runoff, with peak flows of {{convert|15900|cuft/s|m3/s|abbr=on}} recorded near Cortaro.

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{{Tropical cyclone naming}}

The following names were used for tropical storms that formed in the North Pacific Ocean east of 140°W during 1963. The names came from a series of four rotating lists. Names were used one after the other without regard to year, and when the bottom of one list was reached, the next named storm received the name at the top of the next list.{{cite web|url=http://australiasevereweather.com/cyclones/2008/summ0711a.htm|title=Monthly Global Tropical Cyclone Summary: November 2007 First Installment|first=Gary|last=Padgett|date=July 11, 2008|publisher=Australian Severe Weather|accessdate=February 10, 2010}}

Had any tropical storms formed in the North Pacific between 140°W and the International Date Line in 1963, their names would have been drawn from the Western Pacific typhoon naming list.

{{Portal|Tropical cyclones}}

• Tropical cyclone
• List of Pacific hurricanes
• 1964 Atlantic hurricane season
• 1964 Pacific typhoon season
• 1964 North Indian Ocean cyclone season
• Australian region cyclone seasons: 1963–64 1964–65
• South Pacific cyclone seasons: 1963–64 1964–65
• South-West Indian Ocean cyclone seasons: 1963–64 1964–65

{{reflist|2}}

{{1964 Pacific hurricane season buttons}}

{{TC Decades|Year=1960|basin=Pacific|type=hurricane}}

{{Tropical cyclone season|1964}}

{{DEFAULTSORT:1964 Pacific Hurricane Season}}

Category:Pacific hurricane seasons

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