1990 Pacific hurricane season#Tropical Depression Diana

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from:08/06/1990 till:16/06/1990 color:TS text:"Cristina (TS)"

from:19/06/1990 till:23/06/1990 color:TS text:"Douglas (TS)"

from:26/06/1990 till:02/07/1990 color:C1 text:"Elida (C1)"

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from:10/07/1990 till:18/07/1990 color:C2 text:"Genevieve (C2)"

from:19/07/1990 till:31/07/1990 color:C4 text:"Hernan (C4)"

from:20/07/1990 till:30/07/1990 color:C3 text:"Iselle (C3)"

from:24/07/1990 till:26/07/1990 color:TD text:"Eleven-E (TD)"

from:07/08/1990 till:15/08/1990 color:TS text:"Aka (TS)"

from:08/08/1990 till:09/08/1990 color:TD text:"Diana (TD)"

from:10/08/1990 till:13/08/1990 color:TD text:"Two-C (TD)"

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from:17/08/1990 till:19/08/1990 color:TD text:"Twelve-E (TD)"

from:17/08/1990 till:24/08/1990 color:C3 text:"Julio (C3)"

from:21/08/1990 till:30/08/1990 color:C1 text:"Kenna (C1)"

from:23/08/1990 till:01/09/1990 color:C1 text:"Lowell (C1)"

from:07/09/1990 till:21/09/1990 color:C4 text:"Marie (C4)"

from:10/09/1990 till:19/09/1990 color:C1 text:"Norbert (C1)"

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from:23/09/1990 till:02/10/1990 color:C4 text:"Odile (C4)"

from:27/09/1990 till:03/10/1990 color:TS text:"Rachel (TS)"

from:28/09/1990 till:01/10/1990 color:C1 text:"Polo (C1)"

from:09/10/1990 till:14/10/1990 color:TS text:"Simon (TS)"

from:16/10/1990 till:01/11/1990 color:C4 text:"Trudy (C4)"

from:21/10/1990 till:31/10/1990 color:C2 text:"Vance (C2)"

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from:01/06/1990 till:30/06/1990 text:June

from:01/07/1990 till:31/07/1990 text:July

from:01/08/1990 till:31/08/1990 text:August

from:01/09/1990 till:30/09/1990 text:September

from:01/10/1990 till:31/10/1990 text:October

from:01/11/1990 till:30/11/1990 text:November

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{{Highest ACE Pacific hurricane seasons}}

The 1990 eastern North Pacific hurricane season was active in terms of number of storms that attained at least tropical storm intensity and of Accumulated Cyclone Energy (ACE). All of the tropical cyclones of this year developed from westward-moving African tropical waves. The season established several tropical storm records for this basin and was marked by several strong hurricanes. There were 21 named tropical cyclones, seven below the record established by the 1992 Pacific hurricane season two years later, but four more than the long-term average. Sixteen of those named storms, twice the average and four more than the previous record, reached hurricane intensity. Only Cristina, Douglas, Aka, Rachel, and Simon did not reach hurricane strength. Six of those hurricanes reached Category 3 intensity or higher on the Saffir-Simpson Hurricane Scale. Hurricanes Hernan and Trudy were among the strongest ever observed in this area. Alma became the earliest named storm and hurricane in the satellite era in the eastern Pacific Ocean east of the 140th meridian west at the time; a record subsequently eclipsed by Adrian in 2017.{{cite web|author=Case, Robert|year=1990|title=Hurricane Alma Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/alma/prenhc/prelim02.gif}} The eastern Pacific produced four tropical depressions that did not reach tropical storm status.{{cite web|publisher=National Hurricane Center |year=2010 |title=Eastern Pacific Hurricane Database |access-date=April 26, 2010 |url=http://www.nhc.noaa.gov/tracks1949to2010_epa.txt }}{{dead link|date=September 2016 |bot=InternetArchiveBot |fix-attempted=yes}}

With the exception of Marie and Polo, these systems developed between 5° and 15°N, east of the longitude of Baja California Peninsula in the climatologically favored area for tropical cyclogenesis in the basin. After their development, most of the tropical cyclones moved on a west to northwest track and dissipated over cool waters without affecting land. Rachel was the only system to make landfall. In addition, one tropical storm formed in the Central Pacific and eventually crossed the International Dateline before dissipating.

The Accumulated Cyclone Energy (ACE) index for the 1990 Pacific hurricane season (Eastern Pacific and Central Pacific combined) as calculated by Colorado State University using data from the National Hurricane Center was 249.5 units, the fourth highest ACE on record for a Pacific hurricane season.{{#tag:ref|The total represents the sum of the squares of the maximum sustained wind speed (knots) for every (sub)tropical storm's intensity of over {{convert|33|kn|mph km/h}}, divided by 10,000 while they are above that threshold; therefore, tropical depressions are not included.|group="nb"}}{{cite web| title=Basin Archives: Northeast Pacific Ocean Historical Tropical Cyclone Statistics|url=http://tropical.atmos.colostate.edu/Realtime/index.php?arch&loc=northeastpacific|publisher=Colorado State University|location=Fort Collins, Colorado|access-date=July 8, 2022}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Alma 1990-05-15 2101Z.jpg

| Track = Alma 1990 track.png

| Formed = May 12

| Dissipated = May 18

| 1-min winds = 75

| Pressure = 979

}}

{{See also|List of off-season Pacific hurricanes}}

A tropical wave emerged from Africa on April 29. It then moved across the Atlantic, crossed northern South America, and entered the Pacific Ocean on May 9. Convection started to increase with the wave just to the south of Panama. The wave moved westward and continued to become better organized over the next few days. On May 12, the wave had become organized enough and was designated Tropical Depression One-E.{{cite web|author=Case, Robert|year=1990|title=Hurricane Alma Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/alma/prenhc/prelim01.gif}}

Tropical Depression One-E moved slowly to the northwest while strengthening slowly due to easterly vertical wind shear. The depression was upgraded to Tropical Storm Alma on May 14. The storm quickly strengthened once the vertical wind shear relaxed and was near hurricane force by the morning of May 15. Hurricane Alma reached its peak intensity early on May 16 with maximum sustained winds of {{convert|85|mph|km/h|abbr=on}}. The hurricane entered an area of southwesterly wind shear caused by an upper-level ridge of high pressure. The increasing vertical wind shear and cooler water caused Alma to weaken to a tropical storm. On May 17, the storm continued to weaken and became a depression. The next day, the system dissipated as a tropical cyclone well west of mainland Mexico.{{cite web|author=Mayfield, Max|date=May 13, 1990|title=Tropical Cyclone Discussion Tropical Depression One-E|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/alma/tropdisc/tcd1315z.gif}}{{cite web|author=Gerrish, Hal|date=May 15, 1990|title=Tropical Cyclone Discussion Tropical Storm Alma|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/alma/tropdisc/tcd1503z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Boris 1990-06-05 1400Z.png

| Track = Boris 1990 track.png

| Formed = June 2

| Dissipated = June 8

| 1-min winds = 80

| Pressure = 977

}}

A tropical wave came off the northwest coast of Africa on May 20. The wave did not significantly develop as it moved west across the Atlantic Ocean and Caribbean Sea. Once it crossed Central America into the eastern Pacific Ocean, cloudiness increased considerably with the system on May 31.{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Boris Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/boris/prenhc/prelim01.gif}} It became well-enough organized to be upgraded to Tropical Depression Two-E on June 2. After becoming a depression, the system moved to the west-northwestward. Upper-level easterly vertical wind shear limited the amount of the initial strengthening. However, an increase in convective banding led to its upgrade to Tropical Storm Boris on June 4, {{convert|500|mi|km|abbr=on}} southwest of Manzanillo. Further strengthening occurred due to an anticyclone aloft fostered additional development, and by June 5, Boris became a hurricane. The hurricane began to move to the north-northwest in response to a trough off of the West Coast of the United States. Strengthening continued, and the storm reached its peak strength with winds of {{convert|90|mph|km/h|abbr=on}} and a minimum central pressure of {{convert|977|mb|inHg|abbr=on}}. The hurricane's cloud pattern became elongated along a southwest–northeast axis on June 6 due to an increased amount of vertical wind shear. Boris was downgraded to a tropical storm later in the day on June 6. The deep convection of the tropical storm decreased, as Boris moved over cooler waters. It was downgraded to a tropical depression on June 7 due to these factors. The depression dissipated as a tropical cyclone on June 8 as the system quickly lost its tropical characteristics. A small circulation remained in the cloud field offshore the northwest coast of Baja California for a few more days.{{cite web|author=Lixion, Avila|date=June 8, 1990|title=Tropical Cyclone Discussion: Tropical Depression Boris|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/boris/tropdisc/tcd0815z.gif}}

The winds in the eyewall of Boris ripped off the sails of the Azure Dream sailboat. Outer rainbands from the storm produced moderate rain in several Mexican states. In Mexico, rainfall peaked at {{convert|8.83|in|mm|abbr=on}} near San Lucas, Michoacán. The remnants of Boris also brought sporadic rainfall over the western United States, with precipitation being reported in Arizona, California, Colorado, Nevada and Wyoming. The remnants of Boris were responsible for causing the wettest June in San Diego since records began in 1850; however, not even {{convert|1|in|mm|abbr=on}} of rain fell at that location. Rainfall from the remnant system in the United States peaked at {{convert|3.28|in|mm|abbr=on}} over the Santa Rita Mountains.{{cite web|date=August 12, 2008|access-date=January 2, 2011|url=http://www.wpc.ncep.noaa.gov/tropical/rain/boris1990.html|title=Hurricane Boris – June 4–11, 1990|author=Roth, David|publisher=Hydrometeorological Prediction Center}} No other direct damages or casualties were reported from Boris.{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Boris Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/boris/prenhc/prelim02.gif}}{{cite web|author=Avila, Lixion|year=1990|title=Tropical Cyclone Discussion: Tropical Depression Two-E|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/boris/tropdisc/tcd0321z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Cristina 1990-06-12 1500Z.png

| Track = Cristina 1990 track.png

| Formed = June 8

| Dissipated = June 16

| 1-min winds = 55

| Pressure = 994

}}

A tropical wave emerged into the Atlantic Ocean off the coast of Africa on May 28. The wave moved across Central America into the northeastern Pacific Ocean, where convection organized with the system on June 6. The system became well-enough organized to be upgraded to Tropical Depression Three-E on June 8, while {{convert|920|mi|km|abbr=on}} south of the southern tip of Baja California. The depression continued to strengthen, and was upgraded to Tropical Storm Cristina on June 9.{{cite web|author=Avila, Lixion|date=June 22, 1990|title=Tropical Storm Cristina Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/cristina/prenhc/prelim01.gif}}{{cite web|author=Avila, Lixion|date=June 8, 1990|title=Tropical Cyclone Discussion: Tropical Depression Three-E|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/cristina/tropdisc/tcd0815z.gif}}

Cristina initially had well-established upper-level outflow. It failed to reach hurricane status, peaking with maximum sustained winds of {{convert|65|mph|km/h|abbr=on}} due to movement of its associated upper-level anticyclone to the north over Mexico which caused Cristina to be exposed to easterly vertical wind shear. Cristina moved generally northwestward, which eventually placed the storm in cooler waters, and caused the deep convection of the system to dissipate. On June 14, Cristina diminished to a tropical depression. Cristina moved west-northwestward with the low-level flow. The depression dissipated as a tropical cyclone on June 16, after a lack of deep convection for 48 hours.{{cite web|author=Mayfield, Max|date=June 16, 1990|title=Tropical Cyclone Discussion: Tropical Depression Cristina|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/cristina/tropdisc/tcd1621z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Douglas 1990-06-20 2230Z.png

| Track = Douglas 1990 track.png

| Formed = June 19

| Dissipated = June 23

| 1-min winds = 55

| Pressure = 992

}}

A tropical wave moved off the northwest coast of Africa on June 5. It continued westward across the tropical North Atlantic and Caribbean Sea without significant development.{{cite web|author=Gerrish, Hal|year=1990|title=Tropical Storm Douglas Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/douglas/prenhc/prelim01.gif}} The wave entered the northeastern Pacific Ocean on June 16, where it generated an area of increased cloudiness. Organization of thunderstorm activity increased late on June 18 and early on June 19. Tropical Depression Four-E formed on June 19, when it was {{convert|230|mi|km|abbr=on}} south of Acapulco after evidence of low-level circulation for the past 24 hours.{{cite web|author=Lawrence, Miles|date=June 19, 1990|title=Tropical Cyclone Discussion: Tropical Storm Douglas|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/douglas/tropdisc/tcd1921z.gif}} The depression moved in a west-northwest direction, due to a subtropical ridge north of the depression. Satellite analysis indicated that the depression had reached tropical storm force strength, and it was upgraded to Tropical Storm Douglas on June 19, while {{convert|230|mi|km|abbr=on}} southwest of Acapulco. Douglas reached peak strength of {{convert|65|mph|km/h|abbr=on}} on June 21

A tropical storm warning was issued on June 21, from Punta Tejupan to Cabo Corrientes before being discontinued on June 22. Tropical Storm Douglas brushed the western coast of Mexico. The center of circulation approached within {{convert|17|mi|km|abbr=on}} of the coast of Mexico on June 22. Douglas then began to weaken because of interaction with the mountainous terrain of Mexico. The system continued to weaken despite warm water temperatures and favorable upper-level conditions. Douglas dissipated early on June 24, while {{convert|138|mi|km|abbr=on}} south-southeast off the southern tip of Baja California Sur. The highest rainfall report from Mexico from Douglas totaled {{convert|11.07|in|mm|abbr=on}} at La Huerta.{{cite web|url=http://www.wpc.ncep.noaa.gov/tropical/rain/douglas1990filledrainblk.gif|title=Tropical Storm Douglas – June 18–23, 1990|date=May 4, 2010|access-date=January 3, 2011|author=Roth, David|publisher=Hydrometeorological Prediction Center}} No deaths or damage were reported.{{cite web|author=Gerrish, Hal|year=1990|title=Tropical Storm Douglas Preliminary Report, Page 4|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/douglas/prenhc/prelim04.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Elida 1990-06-28 1801Z.png

| Track = Elida 1990 track.png

| Formed = June 26

| Dissipated = July 2

| 1-min winds = 70

| Pressure = 990

}}

A tropical wave came off the coast of Africa into the eastern Atlantic Ocean on June 10 and 11. The system moved across the Atlantic and entered into the northeastern Pacific Ocean.{{cite web|author=Lawrence, Miles|year=1990|title=Hurricane Elida Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/elida/prenhc/prelim01.gif}} The wave became a significant tropical system, with cyclonic turning in the lower and middle layers of the system's cloudiness on June 25. The center of circulation was located {{convert|345|mi|km|abbr=on}} south of Acapulco, Mexico. The system exhibited sufficient organization to be considered Tropical Depression Five-E on June 26. The depression quickly strengthened and became Tropical Storm Elida later that day. The track of Elida was west-northwestward to northwestward from June 27 through June 28. Some rainbands moved over the mountainous region of southwestern Mexico, but no flooding, damage, or casualties were reported as a result. Elida continued strengthening and it was upgraded to a hurricane early on June 28 passing directly over Socorro Island later in the day, right as Elida reached peak strength of {{convert|80|mph|km/h|abbr=on}}, dropping {{convert|3.7|in|mm|abbr=on}} of rain on the island. Some windows broke also as a result, and minor structural damage was reported as a result on the island.{{cite web|author=Lawrence, Miles|year=1990|title=Hurricane Elida Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/elida/prenhc/prelim02.gif}}

A high-pressure area to the north forced Elida to move more westward on June 29. Convection began to decrease in the hurricane as it moved into cooler waters, and it weakened to a tropical storm later in the day. It then weakened to a tropical depression on July 1, and dissipated on July 2.{{cite web|author=Mayfield, Max|date=July 1, 1990|title=Tropical Cyclone Discussion: Tropical Depression Elida|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/elida/tropdisc/tcd0103z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Tropical depression 6-E 1990.JPG

| Track = 06E 1990 track.png

| Formed = June 29

| Dissipated = July 3

| 1-min winds = 30

| Pressure = 1007

}}

An area of disturbed weather south of Acapulco organized into Tropical Depression Six-E on June 29 and the system began to move northwest. Originally the system was expected to reach tropical storm strength and near hurricane intensity by late on July 2 or early on July 3,{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td6e/tropdisc/tcd2921z.gif|title=Tropical Cyclone Discussion: Tropical Depression Six-E (#1)|last=Avila|first=Lixion|date=June 29, 1990|publisher=National Hurricane Center|access-date=January 2, 2011}} however persistent vertical wind shear over the system impeded its development.{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td6e/tropdisc/tcd3009z.gif|title=Tropical Cyclone Discussion: Tropical Depression Six-E (#3)|last=Avila|first=Lixion|date=June 30, 1990|publisher=National Hurricane Center|access-date=January 2, 2011}} After convection began to merge into the Intertropical Convergence Zone (ITCZ), the National Hurricane Center discontinued advisories on Tropical Depression Six-E, stating that the depression dissipated, and regeneration seemed unlikely.{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td6e/tropdisc/tcd3021z.gif|title=Tropical Cyclone Discussion: Tropical Depression Six-E (#5)|date=June 30, 1990|publisher=National Hurricane Center|access-date=January 2, 2011}}

However, wind shear began to decrease, and convection associated with the remnants of Tropical Depression Six-E quickly began to increase. Although the low-level circulation was near the edge of the deep convection, the National Hurricane Center resumed advisories on Tropical Depression Six-E by July 1. Intensification into a tropical storm was again predicted,{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td6e/tropdisc/tcd0121z.gif|author=Gerrish, Hal|title=Tropical Cyclone Discussion: Tropical Depression Six-E (#6)|date=July 1, 1990|publisher=National Hurricane Center|access-date=January 2, 2011}} but Tropical Depression Six-E remained poorly defined, and eventually dissipated on July 4.{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td6e/tropdisc/tcd0421z.gif|author=Gerrish, Hal|title=Tropical Cyclone Discussion: Tropical Depression Six-E (#18)|date=July 4, 1990|publisher=National Hurricane Center|access-date=January 2, 2011}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Fausto 1990-07-08 2000Z.png

| Track = Fausto 1990 track.png

| Formed = July 6

| Dissipated = July 12

| 1-min winds = 75

| Pressure = 979

}}

A tropical wave came off the northwest coast of Africa on June 19. The wave crossed the Atlantic Ocean and Caribbean Sea, into the warm waters of the northeastern Pacific Ocean, on July 2. An area of disturbed weather moved northwards towards the Gulf of Tehuantepec and became Tropical Depression Seven-E early on July 6. The depression moved northwest, and because of increased organization of deep convection, was designated Tropical Storm Fausto on July 7, {{convert|265|mi|km|abbr=on}} south of Manzanillo, Mexico. A weakly defined eye formed on July 8, and the storm was upgraded to Hurricane Fausto, {{convert|310|mi|km|abbr=on}} south of Cabo San Lucas.{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Fausto Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/fausto/prenhc/prelim01.gif}}

Fausto peaked in strength with winds of {{convert|85|mph|km/h|abbr=on}} and a central pressure of {{convert|979|mb|inHg|abbr=on}} on July 9. Fausto passed {{convert|40|mi|km|abbr=on}} north of Socorro Island causing a northwest wind of {{convert|40|mph|km/h|abbr=on}}, and {{convert|4.3|in|mm|abbr=on}} of rain at that location. The hurricane fluctuated in intensity on July 10,{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Fausto Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/fausto/prenhc/prelim02.gif}} before weakening into a tropical storm later that day, {{convert|403|mi|km|abbr=on}} west of Cabo San Lucas. The weakening Fausto moved over continuing cooler waters, and was downgraded to a tropical depression on July 11, {{convert|690|mi|km|abbr=on}} west of Cabo San Lucas. The depression dissipated as a tropical cyclone on July 13, and its low level circulation of clouds persisted for a few days.

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Hurricane Genevieve Jul 15 1990 1731Z.jpg

| Track = Genevieve 1990 track.png

| Formed = July 10

| Dissipated = July 18

| 1-min winds = 90

| Pressure = 970

}}

A tropical wave moved off the coast of Africa on June 25 and moved across the Atlantic Ocean and central Caribbean Sea with little development. Within the western Caribbean Sea, convection developed with the wave on July 7. The system became better organized as it moved into the northeastern Pacific Ocean. The system was upgraded to Tropical Depression Eight-E on July 11. The depression moved west-northwest, with a good outflow to the north, and gradually strengthened into Tropical Storm Genevieve later that day. Genevieve continued to strengthen, reaching hurricane strength on July 13.{{cite web|author=Case, Robert|date=August 16, 1990|title=Hurricane Genevieve Preliminary Report 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/geneviev/prenhc/prelim01.gif}} The storm approached within {{convert|23|mi|km|abbr=on}} of Socorro Island where a sustained wind of {{convert|44|mph|km/h|abbr=on}} and gust of {{convert|50|mph|km/h|abbr=on}} were reported, before the weather equipment on the island failed.{{cite web|author=Case, Robert|date=August 16, 1990|title=Hurricane Genevieve Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/geneviev/prenhc/prelim02.gif}}

The hurricane began to turn west because of the strengthening and growing ridge to its north. Increasing outflow aloft began to form, and the hurricane reached its peak strength of {{convert|105|mph|km/h|abbr=on}} with a well-defined eye at its center of circulation.{{cite web|date=July 11, 1990|title=Tropical Cyclone Discussion: Tropical Depression Eight-E|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/geneviev/tropdisc/tcd1115z.gif}} Genevieve turned northwest on July 16 into an area with strong vertical wind shear and low water temperatures. The hurricane quickly weakened into a tropical storm on July 17 and then into a tropical depression on July 18. Genevieve dissipated as a tropical cyclone later in the day, reduced to a circulation in the stratocumulus cloud field.

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{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Hernan 1990-07-23 0100Z.png

| Track = Hernan 1990 track.png

| Formed = July 19

| Dissipated = July 31

| 1-min winds = 135

| Pressure = 928

}}

A tropical wave that moved off the northwest coast of Africa on July 4 passed through the Atlantic Ocean and Caribbean Sea without significant development.{{cite web|author=Gerrish, Hal|year=1990|title=Hurricane Hernan Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/hernan/prenhc/prelim01.gif}} The wave moved across Central America into the northeastern Pacific Ocean on July 15. Thunderstorm activity increased in the system between July 16 and 18 before rainbands became present within the tropical disturbance on July 19. Tropical Depression Nine-E formed later that day while {{convert|565|mi|km|abbr=on}} southwest of Acapulco, Mexico.

Tropical Depression Nine-E strengthened into Tropical Storm Hernan on July 21 while {{convert|684|mi|km|abbr=on}} south of Cabo San Lucas. The tropical storm continued to strengthen and as it moved to the northwest, and became a hurricane late on July 21. Hernan continued to strengthen and as it passed {{convert|145|mi|km|abbr=on}} southwest of Clarion Island. On July 23, Hernan reached its peak strength of {{convert|155|mph|km/h|abbr=on}} and minimum pressure of {{convert|928|mb|inHg|abbr=on}} as the center of circulation was {{convert|207|mi|km|abbr=on}} south-southwest of Clarion Island. On July 24, concentric eyewalls (one eyewall located inside another) formed around the center of Hernan, which was the first time this pattern had been observed with an eastern Pacific hurricane.{{cite web|author=Gerrish, Hal|year=1990|title=Hurricane Hernan Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/hernan/prenhc/prelim02.gif}}

Hernan kept Category 4 hurricane intensity a few more days and hurricane strength for six days overall. The hurricane weakened into a tropical storm on July 28 as it moved over cooler waters. Hernan turned more to the west as its low level center became separated from its thunderstorm activity and was steering by a surface high-pressure system to its north. Hernan moved over cooler waters, dissipating as a tropical cyclone early on July 31.{{cite web|author=Satchwell, Barry|date=July 31, 1990|title=Tropical Cyclone Discussion: Tropical Depression Hernan|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/hernan/tropdisc/tcd3103z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Hurricane Iselle Jul 25 1990 1801Z.jpg

| Track = Iselle 1990 track.png

| Formed = July 20

| Dissipated = July 30

| 1-min winds = 105

| Pressure = 958

}}

A tropical wave moved off the coast of Africa on July 7. The wave moved west, but it was not until it moved across the Caribbean Sea that the wave's convection organized.{{cite web|author=Avila, Lixion|date=August 15, 1990|title=Hurricane Iselle Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/iselle/prenhc/prelim01.gif}} The system entered into the northeastern Pacific Ocean with concentrated convection and a surface center of circulation while southeast of Acapulco. Moving west-northwest, Tropical Depression Ten-E formed on July 20 {{convert|393|mi|km|abbr=on}} south of Puerto Ángel, Mexico. Early on the following day, the depression strengthened into Tropical Storm Iselle. The storm continued strengthening while in the proximity of Hurricane Hernan, becoming a hurricane on July 22.

The hurricane continued to move west-northwest through its duration, and reached its peak strength of {{convert|120|mph|km/h|abbr=on}} on July 25. Iselle crossed Socorro Island, which recorded a {{convert|70|mi/h|km/h|abbr=on}} sustained wind and heavy rain on July 25.{{cite web|author=Avila, Lixion|date=August 15, 1990|title=Hurricane Iselle Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/iselle/prenhc/prelim02.gif}}{{cite web|author=Avila, Lixion|date=August 15, 1990|title=Hurricane Iselle Preliminary Report, Page 3|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/iselle/prenhc/prelim03.gif}} The hurricane weakened on following days after it moved over cooler waters, downgraded to a tropical storm on July 28 and subsequently into a tropical depression on July 30. The depression dissipated later that day, after losing its low-level circulation {{convert|588|mi|km|abbr=on}} southwest of San Diego.{{cite web|author=Lawrence, Miles|date=July 30, 1990|title=Tropical Cyclone Discussion: Tropical Depression Iselle|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/iselle/tropdisc/tcd3021z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Td-11e 1990.JPG

| Track = 11E 1990 track.png

| Formed = July 24

| Dissipated = July 26

| 1-min winds = 25

| Pressure = 1009

}}

On July 24 a tropical disturbance behind Hurricane Hernan strengthened into a tropical depression. Due to the close proximity of Hernan to its west, the development of the depression was hindered due to vertical wind shear from the outflow of Hernan. This wind shear dissipated the depression on July 26, and its remnants were absorbed by the nearby cyclone. No damages or casualties were caused by the depression as it was well out to sea.{{cite web|author=National Hurricane Center|year=1990|title=Tropical Discussions on Tropical Depression Eleven-E|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td11e/tropdisc}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Aka aug 13 1990 0203Z.jpg

| Track = Aka 1990 track.png

| Formed = August 7

| Dissipated = August 13 (exited basin)

| 1-min winds = 55

| Pressure = 994

}}

Tropical Storm Aka was the only tropical storm to form in the Central North Pacific during 1990. An area of disturbed weather began to organize on August 6. By August 7, the system became well-enough organized to become designated Tropical depression One-C. The depression intensified into a tropical storm while moving west, to the south of the Hawaiian Islands. On August 10, Tropical Storm Aka peaked with maximum sustained winds of {{convert|60|mph|km/h|abbr=on}}. The storm continued to move west and approached Johnston Island, though the island's weather did not deteriorate. The tropical storm crossed the International Date Line on August 13.{{cite report|date=April 1991|title=1990 Tropical Cyclones - Central North Pacific|publisher=Central Pacific Hurricane Center|location=Honolulu, Hawaii|url=https://repository.library.noaa.gov/view/noaa/49714/noaa_49714_DS1.pdf?download-document-submit=Download|access-date=February 3, 2024}} Aka weakened back into a depression and dissipated two days later on August 15.

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{{main|Hurricane Diana}}

{{see also|List of Atlantic–Pacific crossover hurricanes}}

{{Infobox Hurricane Small

| Basin = EPac

| Formed = August 8

| Dissipated = August 9

| Image = Diana 1990-08-07 2004Z.jpg

| Track = Diana 1990 track.png

| 1-min winds = 30

| Pressure = 1004

}}

Atlantic basin Hurricane Diana made landfall on August 7 at Category 2 strength in Tamiahua, Tamaulipas, along the Gulf of Mexico coast. The system quickly deteriorated inland while traversing the high terrain of Mexico. Some convection remained as it emerged into the eastern Pacific Ocean late on August 8.{{cite report|chapter-url=http://www.nhc.noaa.gov/archive/storm_wallets/atlantic/atl1990-prelim/diana/prelim01.gif|title=Preliminary Report: Hurricane Diana|chapter=Synoptic History|page=1|author=Avila, Lixion A.|year=1990|publisher=National Hurricane Center|access-date=February 3, 2024|location=Miami, Florida}} Though Diana crossed between basins, the National Hurricane Center did not re-classify it as an eastern Pacific system. No re-intensification occurred, and by the following day it lost all tropical characteristics. The remnant disturbance turned northward around the eastern periphery of an upper-low and tracked through the Gulf of California. Convection flared up before it moved into northwest Mexico, bringing rainfall amounts of over {{convert|10|in|mm|abbr=on}} to local areas of Sonora. Later, after moving into Arizona, the disturbance dissipated by early on August 14.{{cite web|url=http://www.wpc.ncep.noaa.gov/tropical/rain/diana1990.html|title=Hurricane Diana – August 4–14, 1990|access-date=January 2, 2011|date=January 27, 2007|publisher=Hydrometeorological Prediction Center|author=Roth, David}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = 1990 2-C depression.JPG

| Track = Two-C 1990 track.png

| Formed = August 10

| Dissipated = August 13

| 1-min winds = 30

| Pressure = 1000

}}

Tropical Depression Two-C was the second and last tropical cyclone to develop within the north-central Pacific Ocean in 1990. The depression developed from a tropical disturbance well southeast of Hawaii, which became much better organized on the night of August 10. The tropical depression moved in a west northwest direction for the next 18 hours and then changed to a west-southwest track on August 11. As it turned more to the southwest, the depression weakened until it dissipated on August 13 about {{convert|600|mi|km|abbr=on}} south-southeast of Hilo, Hawaii.

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{{Infobox Hurricane Small

| Basin = EPac

| Formed = August 16

| Dissipated = August 19

| Image = TD12E1990081800zIR.jpg

| Track = 12E 1990 track.png

| 1-min winds = 30

| Pressure = 1009

}}

A persistent area of thunderstorm activity southwest of Puerto Vallarta became better organized and strengthened into Tropical Depression Twelve-E on August 16. Moving northwest, the system developed slowly as it was embedded within the Intertropical Convergence Zone. Easterly shear kept the system from reaching tropical storm strength and caused its ultimate dissipation on August 19. No damages or fatalities were caused by this depression.{{cite web|author=Case|author2=Mayfield|author3=Lawrence|author4=Avila|author5=Gerrish|name-list-style=amp|year=1990|title=Tropical Discussions on 12-E|publisher=NOAA|access-date=December 20, 2006|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td12e/tropdisc/}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Hurricane Julio Aug 21 1990 1831Z.jpg

| Track = Julio 1990 track.png

| Formed = August 17

| Dissipated = August 24

| 1-min winds = 100

| Pressure = 960

}}

A tropical wave moved off the western coast of Africa on August 5, moving across the Atlantic Ocean and Caribbean Sea without significant development. The system entered the northeastern Pacific Ocean, and became well-enough organized to be upgraded to Tropical Depression Thirteen-E on August 17 while centered {{convert|404|mi|km|abbr=on}} south of Acapulco, Mexico. The depression moved on a west-northwestward track and strengthened, becoming Tropical Storm Julio on August 18. Strengthening continued and Julio reached hurricane strength on August 19. The cyclone peaked with maximum sustained winds of {{convert|115|mph|km/h|abbr=on}} on August 21. The storm turned westward and began weakening. Julio regained tropical storm status on August 23 and tropical depression status on August 24 before dissipating as a tropical cyclone later that day. No damage was reported from Julio.{{cite web|author=Lawrence, Miles|year=1990|title=Hurricane Julio Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 2, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/julio/prenhc/prelim01.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Hurricane Kenna 1990 August 26.JPG

| Track = Kenna 1990 track.png

| Formed = August 21

| Dissipated = August 30

| 1-min winds = 75

| Pressure = 980

}}

A tropical wave moved off the coast of Africa on August 9, and spawned Tropical Storm Fran four days later, before it moved through the southern Windward Islands on August 14. While Fran dissipated shortly after that, the tropical wave progressed into the northeastern Pacific Ocean.{{cite web|author=Case, Robert|year=1990|title=Hurricane Kenna Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/kenna/prenhc/prelim01.gif}} The wave spawned Tropical Depression Fourteen-E {{convert|808|mi|km|abbr=on}} east-southeast of Hurricane Julio. The depression moved westward for the next several days. As Julio weakened, the depression began to increase in strength. It became Tropical Storm Kenna on August 22 and continued to strengthen into a hurricane on August 25, peaking with winds of {{convert|85|mph|km/h|abbr=on}} the next day. On August 26, a strong frontal trough weakened the high pressure system to the storm's north, causing a turn to the north during the next few days. The hurricane weakened in response to cooler water and increasing vertical wind shear, which removed convection from its center. Kenna weakened back to tropical storm strength on August 28,{{cite web|author=Avila, Lixion|date=August 28, 1990|title=Tropical Cyclone Discussion: Tropical Storm Kenna|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/kenna/tropdisc/tcd2815z.gif}} then into a tropical depression on August 29. The system dissipated as a tropical cyclone on August 30.{{cite web|author=Avila, Lixion|date=August 30, 1990|title=Tropical Cyclone Discussion: Tropical Depression Kenna|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/kenna/tropdisc/tcd3021z.gif}}

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Hurricane Lowell 1990 August 27.JPG

| Track = Lowell 1990 track.png

| Formed = August 23

| Dissipated = September 1

| 1-min winds = 65

| Pressure = 986

}}

A tropical wave moved off the northwestern coast of Africa into the Atlantic Ocean on August 11. After moving across the Atlantic and Caribbean Sea without development, the system moved through the Intertropical Convergence Zone of the northeastern Pacific Ocean.{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Lowell Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/lowell/prenhc/prelim01.gif}} The cloudiness moved northward toward the Gulf of Tehuantepec on August 22. The thunderstorm activity organized sufficiently for the system to be upgraded to Tropical Depression Fifteen-E on August 23 while {{convert|298|mi|km|abbr=on}} southeast of Acapulco, Mexico. The depression moved west-northwestward and strengthened into a tropical storm {{convert|217|mi|km|abbr=on}} south-southwest of Puerto Vallarta on August 25. The storm began to turn more westward due to a strengthening high pressure system to its north and was upgraded to a hurricane on August 27 while {{convert|286|mi|km|abbr=on}} southwest of Cabo San Lucas. As the high to the north continued to strengthen, the hurricane turned west-southwest.

Thunderstorm activity with the hurricane began to weaken and Lowell was downgraded back to tropical storm status on August 28. The tropical storm then turned to a north-northwestward with the storm passing over cooler waters. On August 31, the storm was downgraded to a tropical depression, with only minimal amounts of deep convection remaining within its circulation. Lowell dissipated as a tropical cyclone on September 1, though a low-level circulation of clouds could be seen on satellite imagery for the next few days. No damage or casualties was reported as a result of Lowell.{{cite web|author=Mayfield, Max|year=1990|title=Hurricane Lowell Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/lowell/prenhc/prelim02.gif}}

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Marie 1990-09-11 0130Z.png

| Track = Marie 1990 track.png

| Formed = September 7

| Dissipated = September 21

| 1-min winds = 120

| Pressure = 944

}}

A tropical wave moved off the northwestern coast of Africa on August 16. The wave moved west through the Atlantic Ocean and Caribbean Sea without significant development.{{cite web|author=Gerrish, Hal|year=1990|title=Hurricane Marie Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/marie/prenhc/prelim01.gif}} The wave moved across Central America and into the northeastern Pacific Ocean, on August 29. Isolated convection with the system increased while south of the Gulf of Tehuantepec as the system moved northwest parallel to the southwest coast of Mexico. Once convective activity increased, the system was upgraded to Tropical Depression Sixteen-E on September 7 while centered {{convert|659|mi|km|abbr=on}} southwest of Clarion Island.

A weaker than normal high pressure system controlled the movement of the depression, and the system moved slowly to the west through its duration. The depression strengthened into Tropical Storm Marie on September 8, and into a hurricane on September 9, while {{convert|522|mi|km|abbr=on}} south-southwest of Clarion Island. Marie reached its peak intensity of {{convert|140|mph|km/h|abbr=on}} on September 11. The hurricane crossed into the central North Pacific on September 14 as a hurricane with maximum sustained winds of {{convert|110|mph|km/h|abbr=on}}. The hurricane weakened thereafter and on September 17 Marie regained tropical storm status. The system weakened into a tropical depression on September 19 and dissipated as a tropical cyclone on September 21 near the Hawaiian coast. No casualties or damages were caused by Marie.

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Norbert 1990-09-14 1830Z.png

| Track = Norbert 1990 track.png

| Formed = September 10

| Dissipated = September 19

| 1-min winds = 70

| Pressure = 983

}}

A tropical wave moved off the coast of Africa and across the Atlantic Ocean and Caribbean Sea without significant development. The wave entered the northeastern Pacific Ocean and began to show signs of organized thunderstorm development. Tropical Depression Seventeen-E formed on September 10 while centered {{convert|758|mi|km|abbr=on}} south-southwest of Cabo San Lucas, Mexico. The depression became better organized and strengthened into Tropical Storm Norbert later in the day.{{cite web|author=Avila, Lixion|year=1990|title=Hurricane Norbert Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/norbert/prenhc/prelim01.gif}}

On September 12, Norbert absorbed Tropical Depression Eighteen-E which was in close proximity. Norbert strengthened as it moved north-northwestward. The tropical storm was upgraded to a hurricane on September 14, and formed an eye on September 15. The storm reached its peak strength of {{convert|80|mph|km/h|abbr=on}} sustained winds that day. Turning north of due west, Norbert then weakened as it moved over cooler waters. It was downgraded to a tropical storm later on September 15, and then to a tropical depression on September 18. Norbert dissipated as a tropical cyclone on September 19 after losing all its deep convection.{{cite web|author=Pasch, Richard|date=September 19, 1990|title=Tropical Cyclone Discussion: Tropical Depression Norbert|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/norbert/tropdisc/tcd1921z.gif}}

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Eighteen-E 1990.JPG

| Track = 18E 1990 track.png

| Formed = September 9

| Dissipated = September 12

| 1-min winds = 30

| Pressure = 1000

}}

On September 12, satellite images indicated that the eighteenth tropical depression of the season formed southwest of Cabo San Lucas. Located in close proximity to Tropical Storm Norbert, the depression would soon enter a region of colder sea surface temperatures, and the National Hurricane Center noted that only very little intensification was possible.{{cite web|author=Avila, Lixion|date=September 12, 1990|title=Tropical Cyclone Discussion: Tropical Depression Eighteen-E (#1)|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td18e/tropdisc/tcd1203z.gif}} As predicted, Norbert hindered further intensification of Tropical Depression Eighteen-E. The National Hurricane Center noted six hours later that the depression would likely be absorbed into Norbert.{{cite web|author=Mayfield, Max|date=September 12, 1990|title=Tropical Cyclone Discussion: Tropical Depression Eighteen-E (#2)|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td18e/tropdisc/tcd1209z.gif}} The National Hurricane Center later believed that Tropical Depression Eighteen-E was "dominating" the interaction between the two systems, and was forecast to absorb Norbert.{{cite web|author1=Pasch, Richard |author2=Lawrence, Miles|date=September 12, 1990|title=Tropical Cyclone Discussion: Tropical Depression Eighteen-E (#3)|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td18e/tropdisc/tcd1215z.gif}} Unlike the latter prediction, Norbert absorbed Tropical Depression Eighteen-E later that day.{{cite web|author1=Pasch, Richard |author2=Lawrence, Miles|date=September 12, 1990|title=Tropical Cyclone Discussion: Tropical Depression Eighteen-E (#4)|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/td18e/tropdisc/tcd1221z.gif}}

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Odile 1990-09-26 1530Z.png

| Track = Odile 1990 track.png

| Formed = September 23

| Dissipated = October 2

| 1-min winds = 125

| Pressure = 935

}}

A tropical wave move off the coast of Africa on September 5, and crossed the Atlantic waters, the Caribbean Sea and eventually into the Pacific Ocean as a weak system. An area of convection entered into the northeastern Pacific Ocean a few hundred miles south of Acapulco, Mexico. On September 23, Tropical Depression Nineteen-E formed from this convection, while {{convert|746|mi|km|abbr=on}} south-southeast from the southern tip of Baja California. The depression moved on a west-northwestward track, rounding the southwest side of a strong high pressure system. The depression continued to strengthen and was upgraded to Tropical Storm Odile on September 24 and into a hurricane on September 25. Its intensity peaked with maximum sustained winds of {{convert|145|mph|km/h|abbr=on}} on September 26.{{cite web|author=Lawrence, Miles|year=1990|title=Hurricane Odile Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/odile/prenhc/prelim01.gif}}

The hurricane began to turn more northwestward in response to a high-pressure system weakening to its north. Odile began to weaken as it moved over cooler waters on September 28. The cyclone regained tropical storm status on September 29 while it slowly progressed northward. The system weakened into a tropical depression status on September 30. Once it lost its deep convection, Odile was steered southwestward by the low-level flow, before it dissipated as a tropical cyclone on October 2. Its remaining low-level circulation of clouds continued on a southwestward course thereafter.{{cite web|author=Mayfield, Max|date=September 30, 1990|title=Tropical Cyclone Discussion: Tropical Depression Odile|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/odile/tropdisc/tcd3021z.gif}}

{{clear}}

{{Main|Tropical Storm Rachel (1990)}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Rachel90bajalandfall.JPG

| Track = Rachel 1990 track.png

| Formed = September 27

| Dissipated = October 3

| 1-min winds = 55

| Pressure = 994

}}

In mid-September, a weak tropical wave moved off the coast of Northwest Africa. It moved westward and entered the eastern Pacific Ocean early on September 23. Cloudiness became concentrated with the system south of the Gulf of Tehuantepec. On September 27, the organized thunderstorm area was upgraded to Tropical Depression Twenty One-E while {{convert|230|mi|km|abbr=on}} south of Acapulco. The depression developed slowly, and became a tropical storm on September 30. As Rachel briefly moved northward, before re-curving and accelerating towards the Mexican coast. The storm passed over the southern portion of Baja California Sur on October 2. Rachel made its final landfall midway between Los Mochis and Culiacán, and became the only system to make landfall from the eastern north Pacific Ocean in 1990.{{cite web|author=Mayfield, Max|year=1990|title=Tropical Storm Rachel Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/rachel/prenhc/prelim01.gif }}{{cite web|author=Mayfield, Max|year=1990|title=Tropical Storm Rachel Preliminary Report, Page 4|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/rachel/prenhc/prelim04.gif}} Rachel decayed rapidly over land, and the final public advisory on Rachel was issued early on October 3.{{cite web|author=Mayfield, Max|date=October 2, 1990|title=Tropical Depression Rachel Advisory Number 11A|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/rachel/public/tcp0300z.gif}} its remnants continued accelerating over Texas until they lost their identity.

The highest rainfall total from the system in Mexico totaled {{convert|9.85|in|mm|abbr=on}} at Santa Anita near the tip of Baja California.{{cite web|url=http://www.wpc.ncep.noaa.gov/tropical/rain/rachel1990filledrainblk.gif|author=Roth, David|title=Tropical Storm Rachel – September 30 – October 3, 1990|date=April 26, 2007|access-date=January 3, 2011|publisher=Hydrometeorological Prediction Center}} Across northern Mexico, thousands were homeless, and 18 people died.{{cite news|title=Hurricane Klaus Downgraded|newspaper=St. Louis Post-Dispatch|date=October 1, 1990}} In Texas, Rachel's remnants caused heavy rain. Flooding occurred in the Big Bend area.{{cite web|author=Mayfield, Max|year=1990|title=Tropical Storm Rachel Preliminary Report, Page 2|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/rachel/prenhc/prelim02.gif }}

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Polo 1990-09-30 1801Z.png

| Track = Polo 1990 track.png

| Formed = September 28

| Dissipated = October 1

| 1-min winds = 65

| Pressure = 987

}}

Polo originated from a tropical wave that moved off the African coast on September 2 which spawned Hurricane Isidore in the Atlantic basin. On September 14, the system increased in convection as it was moving to the west and approaching Central America. The southern extent of the wave crossed into the Pacific Ocean on September 18.{{cite web|author=Case, Robert|year=1990|title=Hurricane Polo Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/polo/prenhc/prelim01.gif}}

The wave continued westward and related thunderstorm activity increased during the following week. The convective system organized into Tropical Depression Twenty-E on September 28 nearly midway between Mexico and Hawaii. Initially, the depression drifted toward the northwest due to a large upper-level trough located to its west. Polo strengthened rapidly into a hurricane early on September 30, with its winds peaking at {{convert|75|mph|km/h|abbr=on}}. Since the storm was very small, vertical wind shear caused significant weakening thereafter. On October 1, Polo crossed into the Central Pacific basin at tropical storm strength. The storm continued to weaken, becoming a tropical depression and then dissipating southwest of Hawaii later in the day. There were no casualties or damages caused by Polo.

{{clear}}

{{Infobox Hurricane Small

| Basin = EPac

| Image = Tropical Storm Simon 1990 October 11.JPG

| Track = Simon 1990 track.png

| Formed = October 9

| Dissipated = October 14

| 1-min winds = 60

| Pressure = 990

}}

A weakly defined tropical wave moved off the northwest coast of Africa on September 20, and crossed the northern portion of the tropical Atlantic and northern South America without significant organization. The wave moved into the northeastern Pacific waters, off the coast of Colombia on September 30. As the wave passed over southern Central America, rainbands and cloudiness increased with the system between October 1 and October 3, before the system merged with the ITCZ from October 4 to October 6. Signs of convective organization reappeared on October 8, and by October 9, the system was upgraded to Tropical Depression Twenty Two-E {{convert|578|mi|km|abbr=on}} south of Cabo San Lucas, Mexico.{{cite web|author=Gerrish, Hal|year=1990|title=Hurricane Simon Preliminary Report, Page 1|publisher=National Hurricane Center|access-date=January 3, 2011|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/simon/prenhc/prelim01.gif}}

The depression continued to develop and was upgraded to Tropical Storm Simon on October 10 while {{convert|604|mi|km|abbr=on}} south-southwest of Cabo San Lucas. Due to a high-pressure system to the north-northwest, Simon continued on a west-northwestward path. The tropical storm continued to strengthen to its peak intensity of {{convert|70|mph|km/h|abbr=on}} by late on October 11. Simon passed over cooler waters and weakened back into a tropical depression on October 13. The depression moved on a westward course, and the low-level circulation was displaced from its deep convection during the following day. Simon then dissipated as a tropical cyclone early on October 15 across the open waters of the northeast Pacific.

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{{Infobox Hurricane Small

| Basin = EPac

| Image = File:Trudy 1990-10-20 1400Z.png

| Track = Trudy 1990 track.png

| Formed = October 16

| Dissipated = November 1

| 1-min winds = 135

| Pressure = 924

}}

The tropical wave that would become future Hurricane Trudy became identifiable on satellite imagery as early as September 30, emerging near the African coast off Cape Verde. However, the wave did not show any signs of development until October 16, when the wave developed into a tropical depression several hundred kilometers south of Acapulco. The tropical depression intensified significantly. The ship Maple Ace reported gale-force winds about {{convert|140|km|mi|abbr=on|round=5}} from the center at 1800 UTC on October 18. In less than 36 hours, at 1200 UTC on October 20, Trudy became a powerful hurricane with Category 4 equivalent maximum winds of {{convert|135|kn|mph km/h|abbr=on|round=5|sortable=on|order=out}} and a minimum pressure of {{convert|925|mbar|inHg|abbr=on}} according to satellite estimates. Trudy was at least as intense as Hurricane Max three years earlier and Hurricane Hernan earlier in the year. Estimates state that Trudy may have been the strongest eastern Pacific hurricane since wind estimates have been available from satellite images.

An upper-level trough forced Trudy to move northwards, increasing the risk of hurricane conditions to Baja California Sur residents. The same trough caused an unfavorable environment that caused Trudy to weaken considerably. At that time, dynamically based numeral models predicted Trudy to move northwards over Baja California and make landfall there. Authorities closed five ports on the Baja California peninsula and the Pacific Ocean port of Mazatlán on October 22 as Hurricane Trudy was approaching the Mexican coast with gusts of up to {{convert|115|mph|km/h|abbr=on}}.{{cite news|title=Hurricane Trudy Closes Six Ports|author=United Press International|url=https://news.google.com/newspapers?nid=2245&dat=19901023&id=IxYzAAAAIBAJ&sjid=MTIHAAAAIBAJ&pg=4105,6251820|newspaper=The Lodi News-Sentinel|date=1990-10-23|access-date=2013-05-26|author-link=United Press International}} However, the trough progressed eastwards and was replaced by a ridge, sparing a landfall, but still causing locally heavy rainfall and high waves. Socorro Island reported hurricane-force winds for more than 7 hours.{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/trudy/prenhc/prelim02.gif|title=Hurricane Trudy Preliminary Report, Page 2|author=Avila, Lixion|publisher=National Hurricane Center|year=1991|access-date=January 2, 2011}} Moving away from land, Trudy then started to re-intensify, developing an unusually large eye of nearly {{convert|90|km|mi|abbr=on|round=5}} in diameter. However, another deep trough approached Trudy and pulled the hurricane northwards, shearing it at the same time. Trudy dissipated on November 1 at 1800 UTC. Its remnant moisture spread over parts of Mexico and the United States.

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{{Infobox Hurricane Small

| Basin = EPac

| Image = Vance 1990-10-25 2030Z.png

| Track = Vance 1990 track.png

| Formed = October 21

| Dissipated = October 31

| 1-min winds = 85

| Pressure = 975

}}

An area of disturbed weather, possibly related to a tropical wave, organized into Tropical Depression Twenty Four-E on October 21. It strengthened into Tropical Storm Vance early on October 23 and then into a hurricane two days later. Vance moved parallel to the west coast of Mexico and approached the southern tip of the Baja California Peninsula. Before it could strike land, a high-pressure area blocked Vance's path and forced the storm to transcribe a small clockwise loop over a two-day period. During the loop, Vance encountered wind shear and cool waters stirred up by Trudy as well as earlier in its duration. Vance weakened to a tropical storm on October 27 and a depression on October 30. The cyclone dissipated late on October 31.{{cite web|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/vance/prenhc/prelim01.gif|title=Hurricane Vance Preliminary Report, Page 1|author=Lawrence, Miles|publisher=National Hurricane Center|year=1991|access-date=January 2, 2011}}

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{{Main|Tropical cyclone naming#Eastern and Central Pacific Ocean}}

The following list of names was used for named storms that formed in the North Pacific Ocean east of 140°W in 1990.{{cite report|url=https://www.aoml.noaa.gov/general/lib/lib1/nhclib/Publications/NatHurricaneOpsPlans/1990.pdf|pages=((3{{hyphen}}6{{ndash}}7))|publisher=NOAA Office of the Federal Coordinator for Meteorological Services and Supporting Research|location=Washington, D.C.|title=National Hurricane Operations Plan|date=May 1990|access-date=January 15, 2024}} This is essentially the same list used for the 1984 season, though the rotating lists went only to the "W" name at the time.{{cite report|url=https://www.aoml.noaa.gov/general/lib/lib1/nhclib/Publications/NatHurricaneOpsPlans/HOPs-1984.pdf|page=3{{hyphen}}10|publisher=NOAA Office of the Federal Coordinator for Meteorological Services and Supporting Research|location=Washington, D.C.|title=National Hurricane Operations Plan|date=May 1984|access-date=January 15, 2024}} It would be used next, with one modification, for the 1996 season, as Wallis was interchanged with Winnie.{{cite report|url=https://www.aoml.noaa.gov/general/lib/lib1/nhclib/Publications/NatHurricaneOpsPlans/HOPs-1996.pdf|pages=((3{{hyphen}}8{{ndash}}9))|publisher=NOAA Office of the Federal Coordinator for Meteorological Services and Supporting Research|location=Washington, D.C.|title=National Hurricane Operations Plan|date=May 1996|access-date=January 15, 2024}} No names were retired from the list following the 1990 season.{{cite web|title=Tropical Cyclone Naming History and Retired Names|url=https://www.nhc.noaa.gov/aboutnames_history.shtml|publisher=National Hurricane Center|location=Miami, Florida|access-date=January 15, 2024}}

For storms that form in the North Pacific from 140°W to the International Date Line, the names come from a series of four rotating lists. Names are used one after the other without regard to year, and when the bottom of one list is reached, the next named storm receives the name at the top of the next list.{{cite web|archive-url=https://web.archive.org/web/20170112131437/http://www.nhc.noaa.gov/aboutnames.shtml |url=http://www.nhc.noaa.gov/aboutnames.shtml |title=Tropical Cyclone Names 2016-2021 |publisher=National Oceanic and Atmospheric Administration |work=National Hurricane Center |archive-date=January 12, 2017 |url-status=dead }} One named storm, listed below, formed in the central North Pacific in 1990. Named storms in the table above that crossed into the area during the year are noted (*).

This is a table of all of the tropical cyclones that formed in the 1990 Pacific hurricane season. It includes their name, duration (within the basin), peak classification and intensities, areas affected, damage, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all of the damage figures are in 1990 USD.

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{{Portal|Tropical cyclones}}

• List of Pacific hurricanes
• Pacific hurricane season
• 1990 Atlantic hurricane season
• 1990 Pacific typhoon season
• 1990 North Indian Ocean cyclone season
• South-West Indian Ocean cyclone season: 1989–90, 1990–91
• Australian region cyclone season: 1989–90, 1990–91
• South Pacific cyclone season: 1989–90, 1990–91

{{reflist|group=nb}}

{{Reflist|2}}

• [http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1990/ NHC 1990 Pacific hurricane season archive]
• [http://www.prh.noaa.gov/cphc/summaries/1990.php Central Pacific Hurricane Center archive]
• [http://www.nhc.noaa.gov/tracks1949to2009_epa.txt List of storms with ACE calculations]

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