2020 Pacific hurricane season

Tropical depression (SSHWS)
Duration	April 25 – April 26
Peak intensity	35 mph (55 km/h) (1-min)  1006 mbar (hPa)

On April 23, the National Hurricane Center (NHC) issued a Special Tropical Weather Outlook (STWO) for a broad area of low pressure located several hundred miles south of the tip of the Baja California Peninsula for potential development into a tropical cyclone.[7] Subsequently, the trough began to quickly organize with convection appearing to wrap around the elongated center of circulation. The low, supported by excellent outflow on its northern side, developed slowly throughout the day and into April 24 as it broke away from the Intertropical Convergence Zone, therefore the NHC assigned it a high possibility of formation in the next 48 hours on the following day due to these increases in organization.[8] However, by later April 24, shower and thunderstorm activity near the center began to diminish, yet the center became slightly more rounded.[9] On April 25, soon indicated by an ASCAT pass, the low developed a much more well-defined center overnight and new thunderstorms began to fully obscure the circulation. Around this time, the NHC upgraded the system to Tropical Depression One-E around 15:00 UTC on April 25, marking the earliest formation of a tropical cyclone in the basin to the east of the 140°W longitude since reliable records began in 1966, with the storm forming over three weeks early from the official start of the season.[10][6] The previous record for earliest forming storm was held by Tropical Storm Adrian of 2017, which formed on May 9.[10]

The depression drifted northwestwards after its formation, with much of its convection displaced to the south of the center as a result of increasing dry air surrounding the system.[11] However, a small convective burst allowed the depression to continue retaining its intensity despite dry air beginning to wrap into the circulation.[10] By April 26, dry air, increasing wind shear and cooling sea surface temperatures began to finally overthrow the small cyclone and deep convection near the center quickly began to dissipate leaving an exposed, ill-defined center displaced from what little thunderstorms remained, barely fitting the criteria for a tropical cyclone altogether.[12] The depression was declared to have dissipated and become a poorly defined remnant low by later that same day, due to a struggle to re-develop convection and increasingly stable air surrounding the center.[13] The next day, the remnant low fully dissipated.

Tropical storm (SSHWS)
Duration	May 30 – May 31
Peak intensity	40 mph (65 km/h) (1-min)  1003 mbar (hPa)

On May 24, the NHC first discussed the probability of possible tropical cyclogenesis associated with a broad area of low pressure that was forecast to form off the coast of El Salvador within a crossing tropical wave in the Atlantic Ocean.[14] The tropical wave tracked generally westward across the Caribbean Sea for several days, crossing over Panama, and entered the Eastern Pacific basin on May 26.[15] At this point, the NHC considered the disturbance to have a high chance of formation in several days.[15] Low pressure developed within the disturbance a day later, and a broad cyclonic circulation also began to develop as the wave was being enhanced by a Central American gyre on May 27.[16] Remaining nearly stationary for several days, the disturbance slowly developed as its circulation grew more well defined.

By May 30, the system developed central deep convection over a now closed low-level circulation and was considered sufficiently organized enough to be designated as Tropical Depression Two-E later that same day, remaining embedded within the eastern side of a Central American gyre.[17] The depression slowly intensified to a strength of 30 kt (35 mph, 55 km/h) in aid of fairly warm sea surface temperatures,[18] and at the time was considered unlikely to intensify further.[18] However, convective organization continued to improve as the system also became much more compact, and satellite estimates allowed the NHC to upgrade the tropical depression to Tropical Storm Amanda at 09:00 UTC on May 31, the first named storm of the season.[19] Only 3 hours after being named, at 12:00 UTC, Amanda made landfall in southeastern Guatemala and began to spread heavy rain inland.[20] Amanda rapidly weakened and dissipated over the country later that day while its mid-level circulation continued north, eventually regenerating as Tropical Storm Cristobal once it emerged over the Bay of Campeche on June 1.

In El Salvador, torrential rainfall caused significant damage along coastal cities in the country as rivers overflowed and swept away buildings.[21] Amanda killed 14 people in El Salvador,[22] of which at least six died due to flash flooding, and one died from a collapsed home.[23] 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.[24][25] El Salvador President Nayib Bukele declared a 15-day national state of emergency due to the storm.[23] Movement restrictions in place for the ongoing 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.[24]

Tropical storm (SSHWS)
Duration	June 24 – June 28
Peak intensity	40 mph (65 km/h) (1-min)  1005 mbar (hPa)

On June 20, the NHC began monitoring a small area of thunderstorms associated with an small low pressure area within the Intertropical Convergence Zone.[26] The system gradually organized and intensified over the next few days and a tight circulation began to emerge from the disorganized thunderstorms surrounding the area on June 23. On the next day, the tight circulation became more well-defined and a circular region of thunderstorms began to develop south of the exposed center. Thus, the NHC initiated advisories on the system, designating it Tropical Depression Three-E.[27] The depression gradually tracked west-northwestward for the rest of the day with little change in strength due to an onset of dry air being drawn into the circulation.[28] This dry air also caused a significant waning of the system's thunderstorm activity, leaving the center of circulation mostly exposed.[28] By the next day, the depression had changed very little in intensity but deep convection began to sporadically appear near the center while the storm continued to struggle against dry air and increasingly stable conditions.[29] Despite being poorly organized, a pass from ASCAT indicated the storm was producing 35 kt winds relatively far from the center and convective activity became more compact and as a result the depression was upgraded to tropical storm intensity and provided the name Boris at around 21:00 UTC on June 25.[30] However, unfavorable conditions continued to slowly degrade the storm's new central convection over time,[31] and Boris weakened back down to a tropical depression at 9:00 UTC on June 26, just 12 hours after becoming a tropical storm, as overall organization of the system became poor due to an entrainment of dry air, moderate wind shear, and decreasing sea surface temperatures.[32]

By 21:00 UTC June 26, a degenerating Boris crossed 140°W and entered the Central Pacific basin as a tropical depression, becoming the first June tropical cyclone in the basin since Tropical Storm Barbara in 2001 and only the second ever recorded, dating back to 1966.[33] Boris continued to crawl west through an increasingly hostile environment into June 27, leaving the center almost completely exposed and only small patches of convection remaining near the LLC.[34] As the system continued to rapidly lose thunderstorm activity, the system was downgraded to a remnant low by early on June 28 and thus the last advisory was issued by the Central Pacific Hurricane Center.[35]