In early June, Andres moved onshore Mexico as a minimal hurricane, while in late October, Ignacio struck the coastline as a tropical depression.

Andres veered northwest and began to weaken, striking the coastline as a minimal hurricane about 105 miles (169 km) east of Manzanillo at 13:00 UTC.

The cyclone moved swiftly westward, becoming Tropical Storm Carlos within six hours and reaching peak winds of 50 mph (80 km/h) on July 15.

Carlos passed about 20 miles (32 km) south of Socorro Island, soon crossing into cooler waters and drier air.

[7] Moving along the south side of an upper-level area of high pressure, the cyclone passed over warm waters which facilitated its continued development.

[4] It became a hurricane at 18:00 UTC on July 18 and then entered a period of rapid intensification, which coincided with the formation of a well-defined eye on satellite imagery.

[7] High pressure shifted northeast into northern Mexico, causing Dolores to curve northwest into cooler waters and drier air.

[7] It moved west over very warm waters,[4] intensifying into Tropical Storm Enrique six hours after formation, and into a hurricane by 00:00 UTC on August 19.

After maintaining that strength for a few days,[7] the cyclone encountered dry air and slightly cooler waters, which caused it to weaken to a tropical storm.

Positioned on the south side of upper-level ridging, the system moved swiftly west-northwest and organized into a tropical depression around 00:00 UTC on August 21.

[4][7] Continued development over very warm waters allowed the depression to become Tropical Storm Fefa within six hours, which then intensified into a hurricane by 06:00 UTC on August 22.

[7] Flow around the southwest side of upper-level ridging directed the storm to curve northwestward, while the system's track over warm waters allowed it to intensify.

After a short pause in intensification, the depression became Tropical Storm Hilda around 06:00 UTC on October 5, at which time it reached peak winds of 45 mph (72 km/h).

[7] A westward track brought the cyclone over cooler waters,[4] and the brief system dissipated over the open East Pacific after 18:00 UTC on October 6.

A curve toward the northwest brought the cyclone over progressively warmer waters,[4] and it reached hurricane intensity around 18:00 UTC on October 26.

[7] A United States Air Force reconnaissance plane investigated the powerful storm at 18:00 UTC on October 27, finding peak winds of 145 mph (233 km/h) – tied with Enrique as the strongest of the season – as well as a 25-mile (35-km) diameter eye covered only by broken low-level clouds.

Subsequent reconnaissance of the storm found various changes to its internal structure, including a pinhole eye down to 6 miles (9.7 km) in diameter before it ultimately became ill-defined.

Ignacio accelerated toward the Mexico coastline, and around 12:00 UTC on October 30 struck about 160 miles (260 km) east-southeast of Manzanillo, Colima, with much-weakened winds of 35 mph (56 km/h).

[7] Afterwards, cold and dry northerly winds flowing across the Gulf of Tehuantepec began to affect Jimena, causing it to weaken.