Deep convection developed near the center of the disturbance, and the system became the first tropical depression of the season on May 22 while located south of Acapulco, Mexico.

Bud turned to the north-northwest, and slowly weakened from June 15 onwards, due to increasing vertical wind shear and cooler ocean water temperatures.

[6] The storm's forward speed decreased and began to meander, as the ridge to the north of Bud weakened and a trough developed over the western United States.

[6] Bud passed near Socorro Island on June 15, with estimated one-minute winds of 45 mph (72 km/h), and caused large waves along the western coast of Mexico.

Moving generally westward at about 11 knots (13 mph), Carlotta developed a ragged banding eye surrounded by deep convection late on June 19, and became a hurricane at 6:00 UTC on the 20th.

The wave became more organized on July 6 and the National Hurricane Center started issuing advisories on the newly developed tropical depression later that day.

[10] The NHC initially predicted that the depression would reach tropical storm intensity, as there was a lack of vertical wind shear around the system and sea surface temperatures were warm enough for intensification to occur.

Late on July 23, deep convection flared up, briefly strengthening the system again, but failed to re-gain tropical storm status, as it remained poorly organized.

No casualties or damaged was reported in association with Hurricane Daniel, despite the system's passing close enough to Hawaii to require tropical storm warnings.

[21] Emilia moved near Socorro Island and its intensity peaked with wind speeds of 65 mph (105 km/h), with an eyewall beginning to form.

The system continued to become better organized, and was classified as Tropical Depression Eight-E, which was centered about 621 miles (999 km) west-southwest of Manzanillo on August 3 at 1200 UTC.

Fabio weakened back to a tropical depression on August 6 and dissipated two days later about 1,347 miles (2,168 km) west-southwest of Cabo San Lucas, Mexico.

Hector moved generally westward under the influence of a strong ridge, developed a central dense overcast and a ragged eye, and became a hurricane on August 14.

The wave crossed Central America and southern Mexico into the Eastern Pacific, and on August 13, a 12:21 UTC QuikSCAT scan revealed a low-level circulation, and it was designated as a tropical depression.

The storm maintained this intensity for 18 hours before passing just south of the Baja California Peninsula, turning west, and weakening to a tropical depression late on August 16.

Abnormally warm sea surface temperatures allowed the system to intensify despite its unusually high latitude, and it became Tropical Storm Wene on August 16.

John originated on August 28 from an area of disturbed weather that was associated with the Intertropical Convergence Zone (ITCZ) near just outside the Central Pacific basin.

Thereafter entering the central Pacific region, Tropical Storm John approached hurricane status while meandering erratically east-southeast of Hawaii.

After the storm finished the loop, it continued to move westward where it reached hurricane strength on September 9 while passing over Socorro Island.

[30] On September 9, forecasters predicted that the storm would remain offshore and its rainbands would bring heavy rains and gusty winds across the Baja California.

As it moved west-northwestward, it organized, and developed into Tropical Depression Fifteen-E on September 15 while 290 miles (470 km) east-southeast of Cabo San Lucas, Baja California Sur.

[37] The same tropical wave that spawned Atlantic Hurricane Gordon organized into an area of low pressure in the Eastern Pacific Ocean on September 18.

Its convection slowly organized while south of Mexico, and a tropical depression formed on September 20 while 205 miles (330 km) south-southeast of Manzanillo, Colima.

Moving west-northwestward away from Mexico, Olivia reached its peak intensity late on October 3 with 55-knot (65 mph) winds, a minimum pressure of 994 millibars.

After Keith made landfall on Mexico and dissipated, northeasterly shear relaxed, and allowed Olivia to re-strengthen and achieve 55-knot winds again early on October 8.

[40] The remnants of Olivia brought considerable rainfall to the American Southwest, Northwestern Mexico, and the Baja California Peninsula, exceeding 3 inches in many areas.

Located several hundred miles south-southeast of the Gulf of Tehuantepec, convection gradually organized and increased, and by October 25 satellite images indicated the development of the eighteenth tropical depression of the season.

Favorable conditions allowed the system to quickly organize, and the wave formed into Tropical Depression Nineteen-E on November 3 while 230 miles (370 km) south of the El Salvador–Guatemala border.

[5] On July 26, a westward moving disturbance in the central Pacific basin containing remnants of Tropical Storm Upana began showing signs of organization as it neared the International Date Line.

The next day, a tropical depression, designated 12W by the Joint Typhoon Warning Center (JTWC), formed about 575 mi (925 km) east of Kwajalein Atoll.