Tropical Depression One-E 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 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.
Tropical Storm Amanda 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 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. In El Salvador, torrential rainfall caused significant damage along coastal cities in the country as rivers overflowed and swept away buildings. Amanda killed 14 people in El Salvador, of which at least six died due to flash flooding, and one died from a collapsed home. 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. El Salvador President
Nayib Bukele declared a 15-day national state of emergency due to the storm.
Tropical Depression Four-E 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 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.
Tropical Storm Cristina 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 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. Initial predictions from the NHC suggested significant strengthening of the cyclone. However, Cristina instead encountered cooler waters and eventually drier air; it reached its peak intensity late on July 10 with winds of 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.
Unnamed tropical storm (Seven-E) 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 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.
Hurricane Douglas 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 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 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 north of Oahu; 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.
Hurricane Elida 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 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.
Tropical Depression Ten-E 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 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.
Tropical Storm Fausto 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. A large plume of moisture brought northwards by Fausto generated massive thunderstorms across a large portion of
Northern California, beginning on August 16. 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
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. The massive
SCU Lightning Complex,
August Complex,
CZU Lightning Complex, and
North Complex fires were connected to the thunderstorms associated with Fausto.
Hurricane Genevieve 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 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 , 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. Genevieve's close pass to Baja California Sur brought its strong winds onshore, with a peak sustained wind of and gust of observed at
Cabo San Lucas Marina. Isolated rainfall totals around overspread Oaxaca and Guerrero, and a storm-peak accumulation of 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. In Mexico, 97,000 customers lost electricity. Hernan dropped heavy rainfall across southwestern Mexico, peaking at in Jalisco. causing
flash flooding and mudslides in several states. At least 400 people were evacuated in Jalisco, and 18 people stuck on their roof in the state had to be rescued. In
Cihuatlán, roughly 365 residents evacuated into shelters. 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. Several schools were damaged by Hernan in the state of
Colima. In Tamala, a
parota tree fell on a road, blocking traffic. In
Manzanillo, some homes and streets were damaged and covered with mud. In
Nayarit, a mudslide occurred on a hill behind a populated neighborhood in
Xalisco, however, no damage has been reported from this incident. 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. Total damage from Hernan in Mexico was estimated at 1.1 billion pesos (US$51.4 million).
Tropical Storm Iselle 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 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.
Tropical Storm Julio 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 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 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.
Tropical Storm Karina 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 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 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.
Tropical Storm Lowell 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 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 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.
Hurricane Marie 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 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 . Marie displayed a well-defined eye surrounded by cloud tops as cool as 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.
Tropical Storm Norbert 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 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 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. 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 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.
Tropical Storm Polo 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 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. ==Storm names==