A moderately strong El Niño, ongoing during the season, may have contributed to the disproportionate number of major hurricanes,[10] as well as reduced activity in the Atlantic.

Now named Alma, the storm turned first to the west-northwest, then to the northwest, and finally to the north as it rounded the western periphery of a subtropical ridge that was located over Mexico.

Two days later, Alma reached its peak intensity as a low-end Category 3 major hurricane with maximum sustained winds of 115 mph (185 km/h).

[14] Operationally, the National Hurricane Center (NHC) assessed Alma to have been slightly weaker – with peak winds of 110 mph (175 km/h), at the upper bound of Category 2 strength[15] – but the agency retroactively upgraded it about two months later.

Concurrently, a tropical wave entered the eastern Pacific basin from the southwestern Caribbean Sea and moved slowly westward toward the trough.

The nascent cyclone steadily strengthened while moving to the west-northwest; it became a tropical storm, named Boris, early on June 9 and reached peak winds of 60 mph (95 km/h) shortly thereafter.

Boris spent the rest of its life drifting while continuing to weaken; it shifted first to the northeast, then to the east, as its intensity dropped to that of a tropical depression late on June 10.

In addition, rainfall damaged several homes in Tequila, Jalisco, but the National Hurricane Center believes that Boris likely did not cause the rain.

[17] An area of disturbed weather near Panama drifted to a location south of Puerto Ángel, Oaxaca, and organized into Tropical Depression Four-E on July 9.

The wave began organizing the next day, becoming Tropical Depression Six-E on July 23 while 350 mi (560 km) south-southeast of Puerto Escondido, Mexico.

[31] The depression was predicted to move westward due to the presence of a ridge of high pressure which was also controlling the movement of Hurricane Douglas.

[33] The storm continued to rapidly intensify and gradually developed a banding eye feature and infrared satellite images showed a possible eyewall in the central dense overcast.

[36] The hurricane, moving at 16 mph (26 km/h), proceeded to make a west-northwestward turn while displaying an eye with an estimated diameter of 11 mi (18 km).

[47] The remnant low of Elida moved northeast and eventually dissipated on July 31, 535 mi (861 km) west of Los Angeles, California.

[51] Located south of a ridge, Fausto moved west-northwestward through an area of warm waters, and it continued intensifying as its outflow increased.

It traveled westward across the Atlantic Ocean, crossing over Central America and emerging in the eastern Pacific, where it merged with a pre-existing Intertropical Convergence Zone disturbance.

[60] Although the center was elongated, wind shear over the system remained light and outflow was good, which led forecasters to predict modest intensification.

[64] Light wind shear and favorable ocean temperatures led to steady intensification of the storm, and satellite images indicated that an eye had developed late on August 31.

[60] As Hernan continued strengthening, its eye became ragged,[66] while its lateral movement to the northwest rose to 17 mph around the southern periphery of a strong deep-layer ridge over the United States.

Soon after, an eyewall replacement cycle began,[68] causing the storm to be downgraded to Category 3 status, just before it turned slightly to the west later in the day.

[74] Rough surf caused minor impact; in the open waters near the center of Hernan, waves generated by the storm were unofficially estimated to exceed 70 feet (21 meters).

[78] The origins of Julio were from a monsoon-like area of convection, possibly related to Hurricane Isidore, that persisted off the west coast of Central America on September 21.

On the outskirts of the Taxco, situated 95 mi (155 km) inland, a school bus carrying 40 kids flipped over, killing three and injuring 18 others.

Despite moving over waters that were still warm, wind shear weakened the system to a minimal Category 4 by the time of its landfall over Mexico late on October 25.

Initially poorly organized, it moved to the north and steadily intensified, becoming Tropical Storm Huko early on October 26 while turning northwestward.

Shortly after turning to the west, conditions allowed for Huko to re-attain hurricane strength on October 31 while it was passing around 140 mi (225 km) south of Johnston Atoll.

On November 2, a ridge caused the hurricane to accelerate, and the next day it crossed the International Date Line into the Western Pacific, becoming a typhoon.

[58][97] While passing near Johnston Atoll, the outer rainbands of the hurricane produced wind gusts up to 30 mph (48 km/h) and locally heavy rainfall.

An upper-level low to the northeast provided outflow, and the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert early on July 19.

[101] Although not classified by the CPHC, the Japan Meteorological Agency (JMA) remarked that a tropical depression had developed by early on July 20, just east of the International Date Line.