[4][5] As a tropical depression, the storm brought heavy rains to portions of Hawaii, triggering flash flooding on a few islands.

Several days later, the storm passed near the Mariana Islands and Guam, bringing tropical storm-force wind gusts and heavy rainfall.

Operationally, this system was not classified a tropical storm until January 16, when it was given the name Winona; thus it was not warned upon by the Central Pacific Hurricane Center during its early stages.

[4] The first storm of the season developed out of a weak area of low pressure situated about 570 mi (925 km) south-southwest of Acapulco, Mexico.

Tracking towards the west, the circulation briefly dissipated on May 30, before redeveloping the following day into Tropical Depression One-E.[6] A ridge of high pressure north of the system steered it towards the west-northwest.

[7] By 0600 UTC on June 1, the National Hurricane Center (NHC) upgraded the depression to a tropical storm and gave it the name Adolph.

[6] Adolph continued to strengthen until early on June 2, at which time it reached its peak intensity with winds of 65 mph (100 km/h) and a minimum pressure of 994 mbar (hPa).

[6] On June 10, an area of disturbed weather was located several hundred miles southwest of Acapulco, Mexico, and the system slowed to a westward drift.

[10] Initially, the depression towards the northwest before a ridge of high pressure situated over Mexico caused the storm to turn towards the west-northwest.

[12] Satellite images early on June 18 showed that cool, dry air was becoming entrained into the northern inflow of the storm and Barbara was nearing cooler waters.

Remaining nearly stationary, the depression gradually strengthened into a tropical storm by June 20, receiving the name Cosme at that time.

[13] Late on June 21, the center of the hurricane made landfall on the Mexican coast, just east of Acapulco with winds of 80 mph (130 km/h).

Later that day, Dalilia further weakened to a tropical depression, with the Central Pacific Hurricane Center issuing their final advisory at that time.

Upon formation, the NHC did not anticipate significant intensification due to it close distance to both cooler waters and Hurricane Dalilia.

Gil formed from an area of disturbed weather located near the Mexico–Guatemala border developed a circulation in the Gulf of Tehuantepec and then dissipated.

[36] The system continued to become better organized, with further intensification foretasted because the low was located over very warm waters;[38] and was upgraded into a hurricane that same day.

This was enough to warrant an upgrade to Tropical Depression Eleven-E.[41] This system slowly became better organized, but northerly wind shear prevent rapid intensification.

[44] Between August 15 and 17, the outer bands of Ismael produced heavy rains along coastal areas of Mexico between Acapulco and Manzanillo, Colima.

[51] After Ismael dissipated, steering currents collapsed, and Juliette moved over cool waters in the open ocean for several days.

On August 25, the seasons fourteenth tropical depression formed off the coast of Sonora, Mexico from a mesoscale convective system.

The fast rate of strengthening continued until August 27, at which time Kiko peaked in intensity as a strong Category 3 hurricane with winds of 120 mph (195 km/h) and a minimum pressure of 955 mbar (hPa; 28.2 inHg).

[3] The hurricane quickly weakened as it moved over the Baja Peninsula, being downgraded to a tropical depression before emerging into the Pacific Ocean on August 28.

After remaining stationary for several days, the system developed into Tropical Depression 18-E on September 8 about 400 mi (640 km) south of the Mexican coastline, after its convection became well-organized.

The storm later developed outflow and eventually an eye, signaling that Octave attained hurricane status late on September 11.

[75] Although Priscilla did not directly impact land as a tropical cyclone, the remnant moisture enhanced a non-tropical low off the California coastline, resulting in heavy rainfall along the Pacific coast of the United States.

Moving slowly to the west-northwest, it accelerated to the northwest in response to a trough and strengthened into the seventeenth named storm of the season on September 26.

On October 15, Tropical Depression 23E developed about 550 mi (890 km) to the southwest of Mexico City, within an area of warm water and diminishing wind shear and as a result was expected to slowly intensify further.

Although the depression was located within an area of high wind shear, convection had managed to partially develop around the center of circulation.

Further intensification was not expected as the depression tracked in a northward direction[95] Shortly after the first advisory was issued, convection rapidly dissipated, leaving an exposed low-pressure area, devoid of shower and thunderstorm activity.

It includes their name, duration (within the basin), peak classification and intensities, areas affected, damage, and death totals.