Adrian led to flash flooding and several landslides across Central America, resulting in five deaths and $12 million (2005 USD) in damage.

[nb 1][5] Broadly speaking, ACE is a measure of the power of a tropical or subtropical storm multiplied by the length of time it existed.

[6] At the time, Adrian was the fourth earliest tropical cyclone to form in the eastern Pacific since reliable record-keeping began in 1971.

[7] Analysis of the environment suggested that most storms formed during the passage of the positive Madden–Julian oscillation and its associated upper-air divergence, which is favorable for tropical cyclone formation.

Another factor that led to a below-average season was the presence of cooler than average ocean temperatures during the peak months, helping to extend the period of lesser activity that began throughout the eastern Pacific around 1995.

[15] A tropical wave emerged off the western coast of Africa on June 11, remaining inconspicuous until reaching the southwestern Caribbean Sea eight days later.

It intensified into Tropical Storm Calvin at 18:00 UTC on June 26, attaining a peak intensity of 50 mph (85 km/h) early the next morning in conjunction with a well-defined spiral band on radar.

The cyclone moved north-northwest and then west-northwest, paralleling the coastline of Mexico under the influence of a subtropical ridge,[19] where landslides and mudslides cut communication to 12 mountain villages.

[23] Already tracking over cooler waters, Eugene quickly weakened immediately after its peak, becoming a tropical depression by 12:00 UTC on July 20 and degenerating into a remnant low twelve hours later.

[22] As a tropical cyclone, Eugene flooded streets (which displaced six vehicles), left at least 30 houses inundated, and caused one death after a man's boat overturned.

Upon further development, the disturbance was designated as a tropical depression as it tracked swiftly west, the first and only cyclone to form in the central Pacific throughout the season.

In addition, minor street flooding was reported in several cities on that island; most notably, a nearly overflown drainage ditch threatened to submerge the Hawaii Belt Road.

The nascent cyclone continued on a west-northwesterly course amid a favorable shear regime; it became a hurricane at 06:00 UTC on August 11 and attained peak winds of 85 mph (140 km/h) early the next day as a ragged eye became discernible.

The depression trekked west-northwest along the southern periphery of a subtropical ridge, intensifying into Tropical Storm Greg six hours after formation and reaching peak winds of 50 mph (85 km/h) by 00:00 UTC on August 12 as deep convection flared near the center and upper-level outflow became well established.

Favorable upper-level winds and warm ocean temperatures allowed it to quickly intensify, and Hilary became a hurricane by 00:00 UTC on August 21.

After leveling off briefly, the cyclone attained its peak as a Category 2 hurricane with winds of 105 mph (185 km/h) early the next morning,[31] consistent with a ragged eye on infrared satellite imagery.

The disturbance initially changed little in organization; an increase in convection on September 12, however, aided in the formation of a tropical depression by 00:00 UTC that day.

[35] Nearby dry air acted to temporarily but significantly weaken Jova's spiral banding despite a favorable upper-level environment.

The hurricane entered the central Pacific on September 26 and weakened to a tropical storm again as south-southwesterly wind shear increased.

Max became a hurricane by 00:00 UTC on September 20 and attained peak winds of 85 mph (140 km/h) twelve hours later, as a large but well-defined eye became apparent.

A few small vortices were observed within the broad low over subsequent days, one of which cled to the formation of a tropical depression by 00:00 UTC on September 23.

On a west-northwest course, the depression intensified into Tropical Storm Norma twelve hours later and ultimately attained peak winds of 60 mph (95 km/h) by 18:00 UTC on September 24 as the circulation became centrally located within the convection and banding features developed.

Norma turned northwest as easterly wind shear increased, causing it to weaken to a tropical depression by 18:00 UTC on September 26 and degenerate to a remnant low a day later.

After emerging into the eastern Pacific nearly two weeks later, the system showed signs of organization, attaining tropical depression status by 00:00 UTC on September 28.

A favorable environment allowed the storm to become a hurricane early on September 30 and attain peak winds of 105 mph (165 km/h) by 06:00 UTC on October 1.

Steering currents weakened after peak, allowing Otis to meander into cooler waters offshore the Baja California peninsula.

Deep convection and a better defined circulation became established as the system detached from the feature, leading to the formation of a tropical depression by 00:00 UTC on October 15.

Shortly thereafter, however, easterly wind shear exposed the low-level center, and the depression degenerated to a remnant low by 00:00 UTC on October 18.

Early on October 19, deep convection began to reform near the circulation, leading to the re-designation of a tropical depression by 12:00 UTC that day.

Like its previous incarnation, however, a combination of dry air and southeasterly wind shear prevented the cyclone from intensifying to tropical storm status, with only a few curved band in its northern semicircle.