2020 Pacific hurricane season#Unnamed Tropical Storm (Seven-E)

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from:30/05/2020 till:31/05/2020 color:TS text:"Amanda (TS)"

from:24/06/2020 till:27/06/2020 color:TS text:"Boris (TS)"

from:29/06/2020 till:30/06/2020 color:TD text:"Four-E (TD)"

from:06/07/2020 till:12/07/2020 color:TS text:"Cristina (TS)"

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from:16/08/2020 till:17/08/2020 color:TS text:"Fausto (TS)"

from:16/08/2020 till:21/08/2020 color:C4 text:"Genevieve (C4)"

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from:12/09/2020 till:16/09/2020 color:TS text:"Karina (TS)"

from:20/09/2020 till:25/09/2020 color:TS text:"Lowell (TS)"

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from:13/10/2020 till:14/10/2020 color:TS text:"Norbert (TS)"

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from:01/07/2020 till:31/07/2020 text:July

from:01/08/2020 till:31/08/2020 text:August

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File:Iselle, Hernan and Laura 2020-08-26.jpg (center) on August 26, with Hurricane Laura in the North Atlantic basin in the top right]]

Although the hurricane season in the eastern Pacific did not officially begin until May 15, and on June 1 in the central Pacific,{{cite report|author=Dorst Neal |title=When is hurricane season? |url=http://www.aoml.noaa.gov/hrd/tcfaq/G1.html |publisher=Atlantic Oceanographic and Meteorological Laboratory |archive-url=https://web.archive.org/web/20101206195446/http://www.aoml.noaa.gov/hrd/tcfaq/G1.html |archive-date=6 December 2010}} activity this year began several weeks prior with the formation of Tropical Depression One-E on April 25. This marked the earliest formation of a tropical cyclone on record in the eastern Pacific basin, surpassing 2017's Tropical Storm Adrian.{{cite news|last1=Mersereau |first1=Dennis|title=The Eastern Pacific Ocean Just Saw Its Earliest Tropical Cyclone On Record|url=https://www.forbes.com/sites/dennismersereau/2020/04/25/the-eastern-pacific-ocean-just-saw-its-earliest-tropical-cyclone-on-record/#373c6643313e|newspaper=Forbes|date=April 25, 2020|access-date=May 2, 2020}} Among relatively unfavorable conditions, the depression soon dissipated without developing further,{{Cite web|title=First April Tropical Depression on Record Formed in the Eastern Pacific Ocean Well South of Baja California (RECAP)|url=https://weather.com/storms/hurricane/news/2020-04-25-tropical-depression-one-e-tropical-storm-amanda-eastern-pacific-0|access-date=2020-06-30|website=The Weather Channel}} and activity would not resume in the basin until nearly a month later with the formation of Tropical Depression Two-E near the coast of Guatemala on May 30. This system would later become Tropical Storm Amanda, the first named storm of the season and one of the worst natural disasters in El Salvador in around two decades.{{Cite web|date=2020-05-31|title=Amanda forms and clashes with a tropical wave in Yucatán|url=https://yucatanexpatlife.com/amanda-forms-and-clashes-with-a-tropical-wave-in-yucatan/|access-date=2020-06-30|website=Yucatán Expat Life}}{{Cite web|title=Tropical depression/storm Amanda impact in El Salvador: Humanitarian Situation Report No. 1 (Reporting Period: 31 May - 10 June 2020) - El Salvador|url=https://reliefweb.int/report/el-salvador/tropical-depressionstorm-amanda-impact-el-salvador-humanitarian-situation-report|access-date=2020-06-30|website=ReliefWeb|date=11 June 2020 }} Not for nearly another month after Amanda, Tropical Depression Three-E would briefly become Tropical Storm Boris on June 25 well out to sea before weakening in the Central Pacific basin.{{Cite web|title=Tropical Storm Boris Forms Over Pacific, Expected To Be Short Lived|url=https://www.bigislandvideonews.com/2020/06/25/tropical-storm-boris-forms-over-pacific-expected-to-be-short-lived/|access-date=2020-06-30|website=bigislandvideonews.com}}{{Cite web|title=Boris Weakens To Tropical Depression|url=https://www.bigislandvideonews.com/2020/06/26/boris-weakens-to-tropical-depression/|access-date=2020-06-30|website=bigislandvideonews.com}} A short-lived tropical depression would form near Baja California Sur just 2 days after Boris's dissipation and quickly weaken.{{Cite news|date=June 30, 2020|title=Tropical depression forms in eastern Pacific|work=AccuWeather|url=https://www.accuweather.com/en/hurricane/tropical-depression-forms-in-eastern-pacific/766060/amp}} Moving into July, Tropical Storm Cristina formed on July 6 and slowly intensified to a peak intensity of {{convert|70|mph|km/h}}, barely missing hurricane status.{{Cite web|title=Cristina poised to become first hurricane of 2020|url=https://www.wusa9.com/article/weather/accuweather/cristina-hurricane-tropical-storm-first-forecast/507-d007706c-9051-4024-a4f7-acac6161a4a1|access-date=2020-07-17|website=wusa9.com|date=7 July 2020 }}{{Cite web|date=2020-07-12|title=Window Closing for Cristina to Become Seasons 1st Hurricane|url=https://www1.cbn.com/cbnnews/world/2020/july/window-closing-for-cristina-to-become-seasons-1st-hurricane|access-date=2020-07-17|website=CBN News}} Activity continued as yet another tropical depression, Six-E, formed on July 13 but quickly dissipated among the unfavorable conditions unfolding in the basin.{{Cite web|title=06E – Eastern Pacific Ocean – Hurricane And Typhoon Updates|url=https://blogs.nasa.gov/hurricanes/2020/07/15/06e-eastern-pacific-ocean-2/|access-date=2020-07-17|website=blogs.nasa.gov|date=15 July 2020 }} Two more tropical systems formed in mid July, Tropical Depression Seven-E and Tropical Storm Douglas. Seven-E was short lived and although it did gain tropical storm intensity, it was operationally left unnamed. Douglas strengthened into the first hurricane of the season at 15:00 UTC on July 22, marking the fourth–latest date any season had gone without a hurricane. Douglas would later strengthen into a Category 4 hurricane and brush Hawaii with rain and gusty winds.{{Cite web|url=https://www.nhc.noaa.gov/archive/2020/ep08/ep082020.discus.009.shtml?|title=Hurricane Douglas Discussion 9|website=nhc.noaa.gov|access-date=2020-07-22}}

{{Least ACE values season in the Pacific hurricane seasons}}

A burst of activity occurred in early August, with a tropical wave south of Mexico evolving into Tropical Storm Elida on August 9, later to become the second hurricane of the season. Elida was generally short lived, but with the formation of Tropical Depression Ten-E, Tropical Storm Fausto, and Hurricane Genevieve activity continued. Genevieve later became the second major hurricane of the season before briefly effecting Baja California Sur as a minimal hurricane. Two additional tropical cyclones, Tropical Storms Hernan and Iselle, formed in late August. Both were generally weak and did not make landfall, although the former brought heavy flooding and mudslides to western Mexico. Later, on September 5, the remnants of former Atlantic tropical cyclone Nana reformed into a new cyclone in the Pacific named Julio. After Julio, Karina and Lowell formed. Near the end of September, Hurricane Marie formed and rapidly intensified up to Category 4 strength before weakening out to sea, becoming the strongest storm of the season. The only October storm of the season, Norbert, lasted for 10 days. After almost a month of inactivity, Odalys formed on November 3, and dissipated three days later without affecting land. Tropical Storm Polo formed close to the end of the season, but it was also short-lived and weak.

The Accumulated Cyclone Energy (ACE) index for the 2020 Pacific hurricane season (Eastern Pacific and Central Pacific combined) as calculated by Colorado State University using data from the National Hurricane Center was 77.3 units.{{#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 33 knots (38 mph, 61 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}} Broadly speaking, ACE is a measure of the power of a tropical or subtropical storm multiplied by the length of time it existed. It is only calculated for full advisories on specific tropical and subtropical systems reaching or exceeding wind speeds of {{convert|39|mph|km/h}}.

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{{Infobox hurricane small

| Basin=EPac

| Image=01E 2020-04-25 2115Z.jpg

| Track=01E 2020 track.png

| Formed=April 25

| Dissipated=April 26

| 1-min winds=30

| Pressure=1006

}}

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

A disturbance developed within the Intertropical Convergence Zone (ITCZ) on April 17, aided by the passage of a convectively-coupled kelvin wave (CCKW) – an eastward-propagating area of enhanced thunderstorm activity near the equator. The disturbance moved westward within the ITCZ over the next several days, and after developing a well-defined center and organized convection, it was designated as Tropical Depression One-E at 06:00 UTC on April 25 about {{convert|805|mi|km|abbr=on|round=5}} southwest of Baja California Sur. Moving northwestward, the depression retained organized deep convection until shortly after 00:00 UTC the next day. Dry air and westerly wind shear caused the depression to weaken and degenerate to a remnant low by 12:00 UTC. The remnant low turned west and opened up into a trough at 18:00 UTC on April 27.{{cite report|author=John P. Cangialosi|title=Tropical Cyclone Report: Tropical Depression One-E|url=https://www.nhc.noaa.gov/data/tcr/EP012020_One-E.pdf|publisher=National Hurricane Center|date=June 30, 2020|access-date=November 2, 2020|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image= Amanda 2020-05-31 1400Z.jpg

| Track=Amanda 2020 track.png

| Formed=May 30

| Dissipated=May 31

| 1-min winds=35

| Pressure=1003

}}

{{Main|Tropical storms Amanda and Cristobal}}

The combination of an upper level low over northeastern Mexico and a passing CCKW over the East Pacific caused an area of low pressure to form south of Guatemala and El Salvador on May 27. Two days later, the system interacted with a tropical wave that first originated from Africa on May 18. The conglomeration of these features led to the formation of a tropical depression around 18:00 UTC on May 30; it was positioned about {{convert|115|mi|km|abbr=on|round=5}} south of Puerto San José, Escuintla. Moving northeastward around the periphery of a large cyclonic gyre over northern Central America, the compact depression continued to organize, strengthening into Tropical Storm Amanda at 06:00 UTC the next day. About four hours later, Amanda made landfall at peak intensity near Las Lisas, Santa Rosa. Amanda rapidly degenerated as it moved inland, with its center dissipating around 18:00 UTC. The remnants of the system moved northward into the Bay of Campeche and redeveloped into the Atlantic's Tropical Storm Cristobal.{{cite report|author=Robbie Berg|title=Tropical Cyclone Report: Tropical Storm Amanda|url=https://www.nhc.noaa.gov/data/tcr/EP022020_Amanda.pdf|publisher=National Hurricane Center|date=September 10, 2020|access-date=November 2, 2020|location=Miami, Florida}}

In El Salvador, torrential rainfall caused significant damage along coastal cities in the country as rivers overflowed and swept away buildings.{{Cite web|title=La tormenta tropical Amanda provoca inundaciones y el desbordamiento de ríos en El Salvador|url=https://www.elsalvador.com/noticias/nacional/el-salvador-tormenta-tropical-amanda-lluvias-depresion/719334/2020/|date=2020-05-31|website=Noticias de El Salvador – elsalvador.com|language=es|access-date=2020-05-31}} Amanda killed 14 people in El Salvador,{{cite news |title=More than a dozen people killed after tropical storm Amanda lashes El Salvador, Guatemala |url=https://www.france24.com/en/20200601-deadly-tropical-storm-amanda-hits-el-salvador-guatemala |access-date=June 1, 2020 |work=France 24 |date=June 1, 2020}} of which at least six died due to flash flooding, and one died from a collapsed home.{{Cite web|title=Alerta Roja por lluvias: Tormenta tropical Amanda deja al menos siete fallecidos y severas inundaciones en El Salvador|url=https://www.laprensagrafica.com/elsalvador/Alerta-Roja-por-lluvias-Tormenta-tropical-Amanda-deja-al-menos-siete-fallecidos-y-severas-inundaciones-en-El-Salvador--20200531-0008.html|website=Noticias de El Salvador – La Prensa Gráfica {{!}} Informate con la verdad|language=es-ES|access-date=2020-05-31}} More than 900 homes were damaged across the country and 1,200 families were evacuated to 51 shelters across La Libertad, San Salvador, Sonsonate, and San Vicente. In the capital, San Salvador, 50 houses were destroyed and 23 vehicles fell into a sinkhole.{{cite news |title=Hurricane Amanda kills 14 people in El Salvador |url=https://7news.com.au/news/severe-weather/hurricane-kills-14-people-in-el-salvador-c-1072120 |access-date=June 1, 2020 |work=Seven News |date=June 1, 2020}}{{cite news |title=Deadly Tropical Storm Amanda hits El Salvador, Guatemala |url=https://www.channelnewsasia.com/news/world/tropical-storm-amanda-hit-el-salvador-guatemala-12790202 |access-date=June 1, 2020 |work=Channel NewsAsia |agency=Agence France-Presse |date=June 1, 2020 |archive-date=June 9, 2020 |archive-url=https://web.archive.org/web/20200609001330/https://www.channelnewsasia.com/news/world/tropical-storm-amanda-hit-el-salvador-guatemala-12790202 |url-status=dead }} El Salvador President Nayib Bukele declared a 15-day national state of emergency due to the storm. Movement restrictions in place for the COVID-19 pandemic were temporarily lifted to allow people to purchase medicines, while hardware stores were allowed to open with limited capacity so people could purchase equipment for repairs.

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{{Infobox hurricane small

| Basin=EPac

| Image=Boris 2020-06-25 2110Z.jpg

| Track=Boris 2020 track.png

| Formed=June 24

| Dissipated=June 27

| 1-min winds=35

| Pressure=1005

}}

The interaction between a tropical wave, a preexisting area of disturbed weather, and the favorable phase of the Madden-Julian Oscillation (MJO) led to the formation of a surface low late on June 23. Deep convection coalesced with this circulation over the ensuing hours, and a tropical depression developed around 06:00 UTC on June 24. The system struggled via the effects of nearby dry air and some wind shear as it moved west to west-northwest under the subtropical ridge. Nonetheless, it intensified into Tropical Storm Boris around 18:00 UTC on June 25 when deep convection was most prevalent. A further increase in upper-level winds prevented Boris from strengthening beyond minimal tropical storm intensity, and it instead weakened to a tropical depression again twelve hours later before crossing into the Central Pacific basin. All associated thunderstorm activity dissipated by June 28, and Boris degenerated to a remnant area of low pressure by 00:00 UTC that day. The post-tropical cyclone curved west-southwest and dissipated well south-southeast of the Hawaiian Islands on June 30.{{cite report|author=Eric S. Blake|title=Tropical Cyclone Report: Tropical Storm Boris|url=https://www.nhc.noaa.gov/data/tcr/EP032020_Boris.pdf|publisher=National Hurricane Center|date=January 13, 2021|accessdate=October 6, 2021|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image=04E 2020-06-29 2050Z.jpg

| Track=04E 2020 track.png

| Formed=June 29

| Dissipated=June 30

| 1-min winds=25

| Pressure=1006

}}

A broad area of disturbed weather, at least partially enhanced by a tropical wave, formed near the Gulf of Tehuantepec on June 25. The system paralleled the Mexican coastline and only slowly organized over the coming days, eventually meeting the criteria to be designated a tropical depression around 18:00 UTC on June 29. Despite coalescing deeper convection near the center at the time of formation, Tropical Depression Four-E failed to attain winds greater than 30 mph (45 km/h) as it encountered hostile southwesterly wind shear and colder ocean waters. Instead, the system degenerated to a remnant area of low pressure by 18:00 UTC on June 30. The low turned north and dissipated well south of Baja California on July 1.{{cite report|author=Richard J. Pasch|title=Tropical Cyclone Report: Tropical Depression Four-E|url=https://www.nhc.noaa.gov/data/tcr/EP042020_Four-E.pdf|publisher=National Hurricane Center|date=March 15, 2021|accessdate=October 7, 2021|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image=Cristina 2020-07-10 2115Z.jpg

| Track=Cristina 2020 track.png

| Formed=July 6

| Dissipated=July 12

| 1-min winds=60

| Pressure=993

}}

A tropical wave emerged off the west coast of Africa on June 20 and crossed into the East Pacific on July 3, where it interacted with the monsoon trough and began to organize. This system developed a defined surface low on July 6 and was classified as a tropical depression about 435 mi (705 km) south of Acapulco, Guerrero. Steered along a northwest trajectory by a mid-level ridge, the depression traversed a region of favorable conditions which enabled slow intensification.{{cite report|author=Jack L. Beven|author2=Christopher W. Landsea|title=Tropical Cyclone Report: Tropical Storm Cristina|url=https://www.nhc.noaa.gov/data/tcr/EP052020_Cristina.pdf|publisher=National Hurricane Center|date=November 13, 2020|access-date=November 23, 2020}} Initial predictions from the NHC suggested significant strengthening of the cyclone.{{cite web|author=Stacy R. Stewart|title=Tropical Storm Cristina Discussion Number 2|url=https://www.nhc.noaa.gov/archive/2020/ep05/ep052020.discus.002.shtml|publisher=National Hurricane Center|date=July 6, 2020|accessdate=January 16, 2022|location=Miami, Florida}} However, Cristina instead encountered cooler waters and eventually drier air; it reached its peak intensity late on July 10 with winds of 70 mph (110 km/h) as it passed west of Socorro Island. Thereafter, the cyclone turned west along the south side of the subtropical ridge and steady weakened. The storm degraded into a remnant low around 18:00 UTC on July 12 and degenerated into a trough on July 15 about halfway between Hawaii and Baja California Sur.

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=06E 2020-07-13 2040Z.jpg

| Track=06E 2020 track.png

| Formed=July 13

| Dissipated=July 14

| 1-min winds=30

| Pressure=1007

}}

A tropical wave, emerging off Africa on July 2, fractured over the western Atlantic several days later. The southern wave axis continued into the eastern Pacific, where its interaction with the monsoon trough resulted in the formation of an area of low pressure. This low failed to organize for a few days as it was hindered by strong northeasterly wind shear, and indeed it briefly opened up into a trough. On July 13, a burst of extremely deep convection led to the redevelopment of a new circulation, and the system organized into a tropical depression around 12:00 UTC that day. As the cyclone moved west-northwest away from Mexico, its associated convection waned, preventing the system from intensifying to a tropical storm. Instead, Tropical Depression Six-E dissipated into an open trough once again around 18:00 UTC on July 14.{{cite report|author=Stacy R. Stewart|title=Tropical Cyclone Report: Tropical Depression Six-E|url=https://www.nhc.noaa.gov/data/tcr/EP062020_Six-E.pdf|publisher=National Hurricane Center|date=December 20, 2020|accessdate=October 8, 2021|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=07E 2020-07-20 2155Z.jpg

| Track=07E 2020 track.png

| Formed=July 20

| Dissipated=July 21

| 1-min winds=35

| Pressure=1006

}}

A tropical wave left Africa on July 6 and emerged into the East Pacific on July 13. It moved west and steadily coalesced despite an environment of cool ocean waters and dry air. At 00:00 UTC on July 20, the disturbance organized into a tropical depression. In real time, the depression was not assessed to have intensified further. However, a post-season review of satellite wind data revealed that it briefly became a 40 mph (65 km/h) tropical storm around the time it displayed a well-defined rainband in its western quadrant. This peak in intensity was short-lived as the system became devoid of deep convection; by 06:00 UTC on July 21, The system degenerated to a remnant low. The low then spun down and dissipated by 00:00 UTC on July 22.{{Cite report|author=Daniel P. Brown|title=Tropical Cyclone Report: Unnamed Tropical Storm (Formerly Tropical Depression Seven-E) (EP072020)|url=https://www.nhc.noaa.gov/data/tcr/EP072020_Unnamed.pdf|publisher=National Hurricane Center|date=December 11, 2020|accessdate=January 16, 2022|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image=Douglas 2020-07-23 2220Z.jpg

| Track=Douglas 2020 track.png

| Formed=July 20

| Dissipated=July 28

| 1-min winds=115

| Pressure=954

}}

{{main|Hurricane Douglas (2020)}}

Douglas originated from a tropical wave that departed Africa on July 8. It reached the East Pacific on July 15, where environmental conditions fostered its development into a tropical depression at 00:00 UTC on July 20 about 805 mi (1,295 km) southwest of Baja California Sur. It strengthened into Tropical Storm Douglas eighteen hours later, and though it suffered a brief dry air intrusion, the storm further organized into a hurricane by 18:00 UTC on July 22. A period of rapid intensification was underway at this point, and over a 30-hour period, its winds increased to 130 mph (215 km/h) on July 24. Shortly thereafter, the hurricane crossed into the Central Pacific on a course toward Hawaii. Cooler ocean waters led to gradual weakening of the hurricane as it approached the state. On July 27, the center of Douglas passed just 60 mi (95 km) north of Oahu; despite its proximity, effects were negligible.{{cite web|author=Ron Brackett|publisher=The Weather Channel|date=July 27, 2020|access-date=December 1, 2020|title=Hurricane Douglas Blows by Hawaii, Leaving Little Damage Behind|url=https://weather.com/safety/hurricane/news/2020-07-27-hawaii-hurricane-douglas}} Increasing wind shear caused the hurricane to rapidly unfold on July 28, resulting in its degradation to a remnant low at 12:00 UTC the next day well to the southeast of Midway Atoll. The low opened up into a trough just west of the International Date Line on July 30.{{cite report|author=Andy S. Latto|title=Tropical Cyclone Report: Hurricane Douglas|url=https://www.nhc.noaa.gov/data/tcr/EP082020_Douglas.pdf|publisher=National Hurricane Center|date=November 21, 2020|accessdate=January 16, 2022|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image=Elida 2020-08-11 1810Z.jpg

| Track=Elida 2020 track.png

| Formed=August 8

| Dissipated=August 12

| 1-min winds=90

| Pressure=971

}}

A tropical wave emerged off Africa on July 26 and split over the Caribbean several days later, with the southern portion of the wave continuing into the eastern Pacific. A small low developed in association with this wave, eventually organizing into a tropical depression by 18:00 UTC on August 8. Twelve hours later, the depression intensified into Tropical Storm Elida while paralleling the coastline of Mexico. Owing to favorable environmental conditions, Elida intensified steadily on August 9 and then rapidly the following day, attaining hurricane strength around 18:00 UTC on August 10. An eye developed within the storm's compact and symmetrical central dense overcast, and Elida reached peak winds of 105 mph (165 km/h) by 12:00 UTC the next morning. Ultimately, the influence of dry air and cooler waters caused the storm to swiftly weaken, and it degenerated to a remnant area of low pressure by 00:00 UTC on August 13 while positioned west of Baja California Sur. The low turned north before opening up into a trough a little over 24 hours later.{{cite report|author=John P. Cangialosi|title=Tropical Cyclone Report: Hurricane Elida|url=https://www.nhc.noaa.gov/data/tcr/EP092020_Elida.pdf|publisher=National Hurricane Center|date=October 24, 2020|accessdate=October 8, 2021|location=Miami, Florida}}

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{{Infobox hurricane small

| Basin=EPac

| Image=10E 2020-08-13 1935Z.jpg

| Track=10E 2020 track.png

| Formed=August 13

| Dissipated=August 16

| 1-min winds=30

| Pressure=1004

}}

An area of disturbed weather formed within the monsoon trough southwest of Baja California on August 11. It moved west and gradually organized, becoming a tropical depression at 06:00 UTC on August 13 while located over the open East Pacific. The system tracked over warm ocean waters, but it was persistently hindered by strong northeasterly wind shear. Thus, it maintained peak winds of 35 mph (55 km/h) and failed to ever become a tropical storm. The depression moved erratically as ridging to its north weakened. After a few days of producing intermittent convection, the system degenerated to a remnant low around 12:00 UTC on August 16. It opened up into a trough the next day.{{cite report|author=Brad J. Reinhart|title=Tropical Cyclone Report: Tropical Depression Ten-E|url=https://www.nhc.noaa.gov/data/tcr/EP102020_Ten-E.pdf|publisher=National Hurricane Center|date=January 4, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Fausto 2020-08-16 1530Z.png

| Track=Fausto 2020 track.png

| Formed=August 16

| Dissipated=August 17

| 1-min winds=35

| Pressure=1004

}}

{{see also|August 2020 California lightning wildfires}}

A tropical wave entered the East Pacific on August 9 and spawned the development of a tropical depression around 00:00 UTC on August 16, despite ongoing easterly wind shear. The depression intensified into Tropical Storm Fausto six hours later, but it was immediately stripped of its convection and thus fell back to a tropical depression only six hours after earning a name. Fausto curved toward the west and moved over colder waters, which further enabled its weakening. The system degenerated to a remnant low around 12:00 UTC on August 17, far away from land. The low moved west and opened up into a trough about a day later.{{cite report|author=Eric S. Blake|title=Tropical Cyclone Report: Tropical Storm Fausto|url=https://www.nhc.noaa.gov/data/tcr/EP112020_Fausto.pdf|publisher=National Hurricane Center|date=February 10, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

A large plume of moisture brought northwards by Fausto generated massive thunderstorms across a large portion of Northern California, beginning on August 16.{{cite web|title=Wondering where this moisture is coming from bringing us these thunderstorms? Check out this GOES-17 infrared imagery and follow the moisture back to Tropical Storm Fausto|url=https://twitter.com/CAL_FIRE/status/1296209793414135809|date=August 16, 2020|access-date=August 16, 2020|website=Twitter}} These storms produced mostly dry lightning with little to no rain, with almost 11,000 lightning strikes occurring in the state between August 16 and 17. The lightning from these storms sparked 367{{Cite web|title=Cal Fire 72 hour activity|url=https://twitter.com/CAL_FIRE/status/1296209793414135809|access-date=2020-08-20|website=twitter.com}} fires across the state, several of which became very large in a short period of time, threatening thousands of structures and forcing thousands of people to evacuate.{{Cite web|date=2020-08-16|title=Moisture from Tropical Storm Fausto fuels NorCal thunderstorms|url=https://ktla.com/news/california/moisture-from-tropical-storm-fausto-fuels-norcal-thunderstorms/|access-date=2020-08-16|website=KTLA}} The massive SCU Lightning Complex, August Complex, CZU Lightning Complex, and North Complex fires were connected to the thunderstorms associated with Fausto.{{cite web|publisher=National Centers for Environmental Information|agency=National Weather Service Forecast Office in Sacramento, California|year=2020|access-date=January 12, 2021|title=[California Event Report: Wildfire]|url=https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=919165}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Genevieve 2020-08-18 2015Z.jpg

| Track=Genevieve 2020 track.png

| Formed=August 16

| Dissipated=August 21

| 1-min winds=115

| Pressure=950

}}

{{main|Hurricane Genevieve (2020)}}

A tropical wave crossed Central America on August 13, becoming the season's next tropical depression around 12:00 UTC on August 16 while located about {{convert|300|mi|km|abbr=on|round=5}} south of Puerto Ángel, Oaxaca. Favorable environmental conditions supported its rapid development while it moved northwest parallel to Mexico. It intensified into Tropical Storm Genevieve at 18:00 UTC on August 16 and became a hurricane around 12:00 UTC the next morning. Within the ensuing 24-hour period, Genevieve's maximum winds increased from 75 mph (120 km/h) to 130 mph (215 km/h), equivalent to a Category 4 hurricane, as it harbored a well-defined eye on satellite imagery. A weakening trend began almost immediately as the storm faced higher southwesterly wind shear and a track over colder waters left by Tropical Storm Elida. The system curved north for a time, nearly moving onshore Baja California Sur before it bent back northwest. This track over colder waters caused Genevieve to lose convection and degenerate to a remnant low around 18:00 UTC on August 21. It dissipated a little under a day later.{{cite report|author=Richard J. Pasch|author2=David P. Roberts|title=Tropical Cyclone Report: Hurricane Genevieve|url=https://www.nhc.noaa.gov/data/tcr/EP122020_Genevieve.pdf|publisher=National Hurricane Center|date=April 13, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

Genevieve's close pass to Baja California Sur brought its strong winds onshore, with a peak sustained wind of {{convert|70|mph|km/h|abbr=on}} and gust of {{convert|90|mph|km/h|abbr=on}} observed at Cabo San Lucas Marina. Isolated rainfall totals around {{convert|4|in|mm|abbr=on}} overspread Oaxaca and Guerrero, and a storm-peak accumulation of {{convert|11.2|in|mm|abbr=on}} occurred at Cabo San Lucas. Resultant flooding caused some damage to hydraulic, highway, and electrical systems throughout Baja California Sur; total damage topped $50 million. Six people were killed: two via landslides and two via swollen rivers in Oaxaca, plus two from drownings at the resort of Los Cabos in Baja California Sur.

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Hernan 2020-08-26 2015Z.jpg

| Track=Hernan 2020 track.png

| Formed=August 26

| Dissipated=August 28

| 1-min winds=40

| Pressure=1001

}}

{{main|Tropical Storm Hernan (2020)}}

The favorable phase of the MJO moved across the East Pacific, enhancing the monsoon trough and spawning an area of disturbed weather. Three areas of low pressure formed along this trough, with the first one developing into Tropical Storm Hernan around 06:00 UTC on August 26. Broad in nature and under the influence of easterly wind shear, Hernan attained peak winds of 45 mph (75 km/h) on August 27 but began to rapidly weaken the next day as it moved north just offshore the Mexico coastline. It degenerated to a remnant low at 18:00 UTC on August 28. The low curved west around a broad circulation that contained the developing Tropical Storm Iselle before being absorbed by that feature later in the day.{{cite report|author=John L. Beven II|title=Tropical Cyclone Report: Tropical Storm Hernan|url=https://www.nhc.noaa.gov/data/tcr/EP132020_Hernan.pdf|publisher=National Hurricane Center|date=March 17, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

In Mexico, 97,000 customers lost electricity.{{Cite web|url=https://newsreportmx.com/2020/08/28/tormenta-tropical-hernan-dejo-sin-luz-a-97-mil-usuarios-de-cfe/|title=Tormenta Tropical "Hernán" dejó sin luz a 97 mil usuarios de CFE|website=News Report MX|access-date=August 29, 2020}}{{Dead link|date=January 2022 |bot=InternetArchiveBot |fix-attempted=yes }} Hernan dropped heavy rainfall across southwestern Mexico, peaking at {{convert|23.24|in|mm|abbr=on}} in Jalisco.{{Cite web|last=Lolas|first=Jose|date=August 29, 2020|title=Tormenta tropical Hernán deja lluvias en seis estados mexicanos|url=https://laprimera.pe/tormenta-tropical-hernan-deja-lluvias-en-seis-estados-mexicanos/|access-date=October 12, 2020|website=La Primera|language=es}} causing flash flooding and mudslides in several states.{{Cite web|url=https://mexiconewsdaily.com/news/evacuations-in-colima-and-jalisco-in-wake-of-tropical-storm/|title=Evacuations in Colima and Jalisco in wake of Tropical Storm Hernan|date=August 28, 2020|website=Mexico News Daily|access-date=August 28, 2020}} At least 400 people were evacuated in Jalisco,{{Cite web|date=2020-08-28|title=Evacuan a 400 personas por tormenta tropical "Hernán" en Jalisco|url=https://www.eluniversal.com.mx/estados/evacuan-400-personas-por-tormenta-tropical-hernan-en-jalisco|access-date=2020-08-28|website=El Universal|language=es}} and 18 people stuck on their roof in the state had to be rescued.{{Cite web|last=|first=|title=Tormenta tropical Hernan deja inundaciones y daños en costa oeste mexicana|url=https://www.infobae.com/america/agencias/2020/08/28/tormenta-tropical-hernan-deja-inundaciones-y-danos-en-costa-oeste-mexicana/|access-date=2020-08-28|website=Infobae|date=28 August 2020 |language=es-ES}} In Cihuatlán, roughly 365 residents evacuated into shelters.{{Cite web|url=https://tribunadelabahia.com.mx/noticias/jalisco/tormenta-tropical-hernan-dejo-las-costas-de-jalisco-37311|title=Tormenta tropical "Hernán" dejó las costas de Jalisco|website=Tribuna De La Bahia|access-date=August 29, 2020|author=Brenda Beltrán|date=28 August 2020 }} A sinkhole shut down a portion of Mexican Federal Highway 80 between Santa Cruz and San Patricio, a mudslide closed down another part of the freeway near Lázaro Cárdenas. The Cuixmala River overflowed its banks, causing parts of Mexican Federal Highway 200 to shut down. The town of La Manzanilla was mostly inundated by floodwaters which caused a bridge near the town to collapse.{{Cite web|url=https://mexiconewsdaily.com/news/evacuations-in-colima-and-jalisco-in-wake-of-tropical-storm/|title=Evacuations in Colima and Jalisco in wake of Tropical Storm Hernán|website=Mexico News Daily|date=28 August 2020 |access-date=August 29, 2020}} Several schools were damaged by Hernan in the state of Colima.{{Cite web|url=https://www.colimanoticias.com/escuelas-de-colima-sin-danos-considerables-por-tormenta-tropical-hernan/|title=Escuelas de Colima, sin daños considerables por Tormenta Tropical 'Hernán'|date=August 29, 2020|access-date=September 4, 2020|publisher=Colimanoticias}} In Tamala, a parota tree fell on a road, blocking traffic.{{Cite web|url=https://www.colimanoticias.com/causa-hernan-caida-de-parota-y-obstruccion-de-carretera-en-ixtlahuacan/|title=Causa 'Hernán' caída de Parota y obstrucción de carretera en Ixtlahuacán|date=August 27, 2020|access-date=September 4, 2020|publisher=Colimanoticias}} In Manzanillo, some homes and streets were damaged and covered with mud.{{Cite web|url=https://www.colimanoticias.com/manzanillo-despues-de-la-tormenta-tropical-hernan/|title=Manzanillo después de la Tormenta Tropical 'Hernán'|author=Norma Osiris Moreno|date=August 28, 2020|access-date=September 4, 2020}} In Nayarit, a mudslide occurred on a hill behind a populated neighborhood in Xalisco, however, no damage has been reported from this incident.{{Cite web|url=https://www.unotv.com/nacional/tormenta-tropical-hernan-deja-danos-y-tocara-tierra-en-baja-california-sur/|title=Hernán tocará tierra en BCS; hay alerta en estos estados|work=Uno TV|date=August 28, 2020|access-date=September 4, 2020|language=es}} Despite Hernan weakening into a tropical depression before landfall in Baja California Sur, local weather services in the area advised residents to take extreme precautions.{{Cite web|url=https://holanews.com/hernan-decrece-a-depresion-en-el-pacifico-pero-golpeara-a-baja-california-sur/|title=Hernan decrece a depresión en el Pacífico pero golpeará a Baja California Sur|date=August 28, 2020|access-date=September 4, 2020|publisher=Hola News|archive-date=September 13, 2020|archive-url=https://web.archive.org/web/20200913081150/https://holanews.com/hernan-decrece-a-depresion-en-el-pacifico-pero-golpeara-a-baja-california-sur/|url-status=dead}} Total damage from Hernan in Mexico was estimated at MXN$594.05 million pesos (US$26.91 million) by a federal Damage Assessment Committee.{{cite news|author=Isaac Castillo Pineda|title=Monto para resarcir daños por "Hernán" asciende los 500 MDP|url=https://www.meganoticias.mx/ixtapa-zihuatanejo/noticia/monto-para-resarcir-danos-por-hernan-asciende-los-500-mdp/184459|work=Meganoticias|language=es-MX|location=Ixtapa, Guerrero, Mexico|date=September 30, 2020|access-date=November 7, 2023}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Iselle 2020-08-28 2030Z.jpg

| Track=Iselle 2020 track.png

| Formed=August 26

| Dissipated=August 30

| 1-min winds=50

| Pressure=997

}}

Within the broad cyclonic circulation across Central America and adjacent waters, a westward-moving tropical wave spawned an area of low pressure on August 23. This low, originally weak and ill-defined, was enhanced by a CCKW two days later. Following increased organization, it became a tropical depression around 12:00 UTC on August 26 while positioned well southwest of Baja California Sur. The depression strengthened into Tropical Storm Iselle six hours later. The newly formed system encountered strong east-northeasterly wind shear, but the effects of this shear were offset by strong diffluence that aided in deep convection. Iselle reached peak winds of 60 mph (95 km/h) early on August 28 when it displayed semblance of a mid-level eye on microwave imagery. As the cyclone moved north-northeast, though, it encountered a more hostile environment and began to weaken. The system degenerated to a remnant low at 18:00 UTC on August 30, and that low dissipated 24 hours later just offshore Baja California Sur.{{cite report|author=Stacy R. Stewart|title=Tropical Cyclone Report: Tropical Storm Iselle|url=https://www.nhc.noaa.gov/data/tcr/EP142020_Iselle.pdf|publisher=National Hurricane Center|date=February 1, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Julio 2020-09-05 2030Z.jpg

| Track=Julio 2020 track.png

| Formed=September 5

| Dissipated=September 7

| 1-min winds=40

| Pressure=1004

}}

On September 3, the Atlantic's Hurricane Nana made landfall in southern Belize. It crossed Mexico over the next day, with its low-level center dissipating but its mid-level remnants continuing into the East Pacific. Plentiful convection spawned a new circulation and yielded tropical storm-force winds, resulting in the designation of Tropical Storm Julio about 85 mi (140 km) southwest of Puerto Angel, Oaxaca, at 00:00 UTC on September 5. The new storm moved unusually quick toward the west-northwest and reached peak winds of 45 mph (75 km/h) on September 6 when a concentrated burst of thunderstorms developed over its center. An uptick in easterly wind shear prevented additional development, and Julio instead opened up into a trough around 06:00 UTC on September 7. The next day, its remnants were absorbed by a broad area of low pressure southwest of Socorro Island.{{cite report|author=Daniel P. Brown|title=Tropical Cyclone Report: Tropical Storm Julio|url=https://www.nhc.noaa.gov/data/tcr/EP152020_Julio.pdf|publisher=National Hurricane Center|date=January 20, 2021|accessdate=January 16, 2022|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Karina 2020-09-15 2145Z.jpg

| Track=Karina 2020 track.png

| Formed=September 12

| Dissipated=September 16

| 1-min winds=50

| Pressure=996

}}

A tropical wave departed Africa on August 26 and emerged into the East Pacific by September 7, where it only slowly developed. By 18:00 UTC on September 12, a new tropical depression formed about {{convert|540|mi|km|abbr=on|round=5}} south-southwest of Baja California Sur. The system moved west-northwest on the southwest side of a ridge throughout its duration. In the wake of its formation, the depression struggled with northeasterly wind shear which kept the center exposed. Despite this, it intensified into Tropical Storm Karina around 06:00 UTC on September 13. Shear decreased the following day, allowing Karina to attain peak winds of 60 mph (95 km/h) on September 15. Ocean waters eventually began to decrease, causing a weakening trend that resulted in Karina's degeneration to a remnant low at 18:00 UTC on September 16. The low turned west and opened up into a trough early on September 18.{{cite report|author=Andrew S. Latto|title=Tropical Cyclone Report: Tropical Storm Karina|url=https://www.nhc.noaa.gov/data/tcr/EP162020_Karina.pdf|publisher=National Hurricane Center|date=January 29, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=Atl

| Image=Lowell 2020-09-22 2100Z.jpg

| Track=Lowell 2020 track.png

| Formed=September 20

| Dissipated=September 25

| 1-min winds=45

| Pressure=1001

}}

A trough developed south of the Atlantic's Tropical Storm Beta on September 28, stretching from the southwestern Gulf of Mexico into the East Pacific. A disturbance formed on the southern end of this trough, eventually organizing into a tropical depression at 18:00 UTC on September 20. It was located about {{convert|575|mi|km|abbr=on|round=5}} south-southeast of Baja California Sur then. Hostile wind shear initially prevented the depression from intensifying, but it lessened somewhat on September 21, allowing the system to become Tropical Storm Lowell around 18:00 UTC that day. Lowell attained peak winds of 50 mph (85 km/h) on September 23, but it began to weaken later that day while encountering stronger wind shear and cooler ocean waters. Deep convection was gradually stripped from the cyclone's center, and Lowell degenerated to a remnant low at 18:00 UTC on September 25. The low moved west and opened up into a trough on September 28 well east of the Big Island.{{Cite report|author=John P. Cangialosi|title=Tropical Cyclone Report: Tropical Storm Lowell|url=https://www.nhc.noaa.gov/data/tcr/EP172020_Lowell.pdf|publisher=National Hurricane Center|date=December 2, 2020|accessdate=December 4, 2020|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Marie 2020-10-02 2115Z.jpg

| Track=Marie 2020 track.png

| Formed=September 29

| Dissipated=October 6

| 1-min winds=120

| Pressure=945

}}

A tropical wave interacted with the monsoon trough south of Mexico and an overarching CCKW, resulting in a broad disturbance on September 24. The system moved west-northwest, coalescing into a tropical depression around 06:00 UTC on September 29 while located about {{convert|415|mi|km|abbr=on|round=5}} southwest of Manzanillo. Twelve hours later, it became Tropical Storm Marie. The nascent storm moved through an environment of warm ocean waters, abundant moisture, and decreasing northeasterly wind shear which facilitated its rapid organization. Marie became a hurricane at 00:00 UTC on October 1; within 30 hours, it reached its peak as a Category 4 hurricane with winds of 140 mph (220 km/h). Marie displayed a well-defined eye surrounded by cloud tops as cool as {{convert|-75|C|F|abbr=on|order=flip|round=5}} around this time. Inner core processes modulated Marie's strength for a time, but it eventually crossed into cooler waters, drier air, and higher southwesterly wind shear. These factors caused it to degenerate to a remnant low by 18:00 UTC on October 6. A brief burst of convection nudged the low northward on October 7, but the cyclone curved west-southwest and opened up into a trough three days later, just after crossing into the Central Pacific.{{cite report|author=Philippe P. Papin|title=Tropical Cyclone Report: Hurricane Marie|url=https://www.nhc.noaa.gov/data/tcr/EP182020_Marie.pdf|publisher=National Hurricane Center|date=February 18, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Norbert 2020-10-06 2025Z.jpg

| Track=Norbert 2020 track.png

| Formed=October 5

| Dissipated=October 14

| 1-min winds=50

| Pressure=1000

}}

A tropical wave left Africa on September 19 and moved over Central America on September 29. It gradually became more concentrated south of Mexico, developing into a tropical depression about {{convert|635|mi|km|abbr=on|round=5}} southwest of Acapulco at 06:00 UTC on October 5. The system moved northwest and it intensified amid favorable environmental conditions. Spiral banding increased near the center, signaling its intensification to Tropical Storm Norbert twelve hours after formation. Norbert attained peak winds of 60 mph (95 km/h) on October 6, but it encountered drier air and increasing westerly wind shear. Convection burst intermittently over subsequent days, but the cyclone weakened as it underwent a cyclonic loop. Around 00:00 UTC on October 10, the system opened up into a trough south of Manzanillo.{{cite report|author=Eric S. Blake|title=Tropical Cyclone Report: Tropical Storm Norbert|url=https://www.nhc.noaa.gov/data/tcr/EP192020_Norbert.pdf|publisher=National Hurricane Center|date=March 15, 2021|accessdate=January 15, 2022|location=Miami, Florida}}

The remnants of Norbert moved generally northwest and continued to face unfavorable wind shear. However, sporadic bursts of convection led to a new mid-level center and eventually a surface one as well. These features aligned, and thunderstorm activity increased, leading to Norbert's redesignation as a tropical depression near 18:00 UTC on October 13. It regained tropical storm status and reached a secondary peak of 45 mph (75 km/h) on October 14. Just as its previous stint as a tropical cyclone, though, the cyclone encountered hostile conditions and began to weaken. It degenerated to a remnant low near 00:00 UTC on October 15 and dissipated less than 12 hours later to the west of Baja California Sur.

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=File:Odalys 2020-11-04 1830Z.jpg

| Track=Odalys 2020 track.png

| Formed=November 3

| Dissipated=November 5

| 1-min winds=45

| Pressure=1000

}}

A tropical wave passed over Central America and entered the Eastern Pacific basin on October 29. Its associated thunderstorm activity remained relatively disorganized until November 1, when a broad area of low pressure developed within the system. By 18:00 UTC on November 3, the NHC determined the system was sufficiently organized to be designated Tropical Storm Odalys while it was centered about 730 mi (1,175 km) southwest of Baja California Sur. Odalys intensified somewhat over the next few days while moving west-northwest despite strong wind shear and dry air impinging on the system. At 00:00 UTC on November 5, the system reached its peak intensity with winds of 50 mph (85 km/h). Wind shear increased further shortly afterwards, causing Odalys to weaken quickly and eventually become a post-tropical cyclone at 18:00 UTC on November 5. Its shallow remnants turned southwest under the influence of a strong high-pressure area and dissipated by November 8.{{cite report|author=Richard J. Pasch|url=https://www.nhc.noaa.gov/data/tcr/EP202020_Odalys.pdf|title=Tropical Cyclone Report: Tropical Storm Odalys|publisher=National Hurricane Center|date=April 13, 2021|access-date=April 24, 2021|location=Miami, Florida}}

{{clear}}

{{Infobox hurricane small

| Basin=EPac

| Image=Polo 2020-11-18 1840Z.jpg

| Track=Polo 2020 track.png

| Formed=November 17

| Dissipated=November 19

| 1-min winds=40

| Pressure=1004

}}

The season's final storm developed from an area of convection within the monsoon trough that may have been enhanced by a Gulf of Tehuantepec gap wind event over preceding days. On November 14, a broad area of low pressure formed. Both the low and associated thunderstorm activity gained cohesion over the coming days, resulting in the formation of a tropical depression around 18:00 UTC on November 17 to the southwest of Baja California Sur. The depression intensified into Tropical Storm Polo six hours later and reached peak winds of 45 mph (75 km/h) the following morning. As the system moved west-northwest, it encountered an increasingly hostile environment, and Polo weakened to a tropical depression early on November 19. By 18:00 UTC that day, the cyclone degenerated to a remnant area of low pressure that moved west and then west-southwest prior to dissipating into an open trough on November 21.{{cite report|author=John L. Beven II|title=Tropical Cyclone Report: Tropical Storm Polo|url=https://www.nhc.noaa.gov/data/tcr/EP212020_Polo.pdf|publisher=National Hurricane Center|date=March 17, 2021|accessdate=October 9, 2021|location=Miami, Florida}}

{{clear}}

{{Tropical cyclone naming}}

The following list of names was used for named storms that formed in the North Pacific Ocean east of 140°W during 2020.{{cite report|url=https://www.icams-portal.gov/resources/ofcm/nhop/2020_nhop.pdf|page=3{{hyphen}}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 2020|access-date=January 27, 2024}} This is the same list used for the 2014 season, with the exception of the name Odalys, which replaced Odile. The name Odalys was used for the first time this year. No names were retired following the season, so this list will be used again for the 2026 season.{{Cite web|title=Tropical Cyclone Names|url=https://www.nhc.noaa.gov/aboutnames.shtml|publisher=National Hurricane Center|location=Miami, Florida|access-date=January 27, 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. No storms formed within the area in 2020. Named storms in the table above that crossed into the area during the season are noted (*).{{cite report|title=2020 Hurricane Season Summary for the Central Pacific Basin|date=November 28, 2020|url=https://www.weather.gov/media/hfo/2020_HurricaneSeasonSummary.pdf|publisher=NOAA|access-date=January 27, 2024}}

This is a table of all of the storms that formed in the 2020 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 2020 USD.

{{Saffir-Simpson small|align=center}}{{TC stats table start3|year=2020|basin=Pacific hurricane}}

{{TC stats cyclone3|cat=depression|name=One-E|dates=April 25 – 26|max-winds=35 (55)|min-press=1006|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Amanda|dates=May 30 – 31|max-winds=40 (65)|min-press=1003|areas=Guatemala, El Salvador, Honduras, Belize, Costa Rica, Southern Mexico, Yucatán Peninsula|damage=≥$200 million|deaths=40}}

{{TC stats cyclone3|cat=storm|name=Boris|dates=June 24 – 27|max-winds=40 (65)|min-press=1005|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=depression|name=Four-E|dates=June 29 – 30|max-winds=30 (45)|min-press=1006|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Cristina|dates=July 6 – 12|max-winds=70 (110)|min-press=993|areas=Socorro Island|damage=None|deaths=None}}

{{TC stats cyclone3|cat=depression|name=Six-E|dates=July 13 – 14|max-winds=35 (55)|min-press=1007|areas=Central America|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Unnamed|dates=July 20 – 21|max-winds=40 (65)|min-press=1006|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=cat4|name=Douglas|dates=July 20 – 28|max-winds=130 (215)|min-press=954|areas=Hawaii|damage=Minimal|deaths=None}}

{{TC stats cyclone3|cat=cat2|name=Elida|dates=August 8 – 12|max-winds=105 (165)|min-press=971|areas=Southwestern Mexico, Socorro Island|damage=None|deaths=None}}

{{TC stats cyclone3|cat=depression|name=Ten-E|dates=August 13 – 16|max-winds=35 (55)|min-press=1004|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Fausto|dates=August 16 – 17|max-winds=40 (65)|min-press=1004|areas=Northern California|damage=None|deaths=None}}

{{TC stats cyclone3|cat=cat4|name=Genevieve|dates=August 16 – 21|max-winds=130 (215)|min-press=950|areas=Southwestern Mexico, Socorro Island, Baja California Peninsula, Southern California|damage=$50 million|deaths=6}}

{{TC stats cyclone3|cat=storm|name=Hernan|dates=August 26 – 28|max-winds=45 (75)|min-press=1001|areas=Mexico, Baja California Peninsula|damage=$26.91 million|deaths=1}}

{{TC stats cyclone3|cat=storm|name=Iselle|dates=August 26 – 30|max-winds=60 (95)|min-press=997|areas=Clarion Island|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Julio|dates=September 5 – 7|max-winds=45 (75)|min-press=1004|areas=Southwestern Mexico|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Karina|dates=September 12 – 16|max-winds=60 (95)|min-press=996|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Lowell|dates=September 20 – 25|max-winds=50 (85)|min-press=1001|areas=Clarion Island|damage=None|deaths=None}}

{{TC stats cyclone3|cat=cat4|name=Marie|dates=September 29 – October 6|max-winds=140 (220)|min-press=945|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Norbert|dates=October 5 – 14|max-winds=60 (95)|min-press=1000|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Odalys|dates=November 3 – 5|max-winds=50 (85)|min-press=1000|areas=None|damage=None|deaths=None}}

{{TC stats cyclone3|cat=storm|name=Polo|dates=November 17 – 19|max-winds=45 (75)|min-press=1004|areas=None|damage=None|deaths=None}}

{{TC stats table end3|num-cyclones=21|dates=April 25 – November 19|max-winds=140 (220)|min-press=945|tot-areas=|tot-damage=≥$276.91 million|tot-deaths=47}}

{{Portal|Tropical cyclones}}

• Tropical cyclones in 2020
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• South-West Indian Ocean cyclone seasons: 2019–20, 2020–21
• Australian region cyclone seasons: 2019–20, 2020–21
• South Pacific cyclone seasons: 2019–20, 2020–21

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{{reflist|group="nb"}}

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{{commons category}}

• [http://www.nhc.noaa.gov National Hurricane Center Website]
• [http://www.nhc.noaa.gov/text/MIATWOEP.shtml National Hurricane Center's Eastern Pacific Tropical Weather Outlook]
• [http://smn.cna.gob.mx/ Servicio Meteorológico Nacional Website] {{in lang|es}}
• [http://www.metoc.navy.mil/jtwc/ Joint Typhoon Warning Center] {{Webarchive|url=https://web.archive.org/web/20180202190141/http://www.metoc.navy.mil/jtwc/ |date=2018-02-02 }}
• [https://www.nhc.noaa.gov/data/tcr/index.php?season=2020&basin=epac NHC 2020 Pacific hurricane season archive]

{{Lowest ACE Pacific hurricane seasons}}

{{2020 Pacific hurricane season buttons}}

{{TC Decades|Year=2020|basin=Pacific|type=hurricane}}

{{Tropical cyclone season|2020}}

Category:Pacific hurricane seasons

Category:Tropical cyclones in 2020