Most tropical cyclones remained over the open eastern Pacific; however, the remnants of hurricanes Doreen and Heather led to heavy rainfall which damaged or destroyed structures and flooded roadways throughout the Southwest United States.

[8] The system remained over warm waters as it moved west and then north, allowing Ava to reach a peak intensity of 65 mph (105 km/h) early on May 28.

A series of subsequent reconnaissance aircraft missions documented an incomplete eye in association with the storm, although this organization soon began to fade amidst increasing wind shear and cooler ocean temperatures.

[8] A tropical disturbance, embedded within a larger area of convective activity, formed early on July 1 while well south of Acapulco, Mexico.

[8] Rapid development ensued thereafter as an eye became evident on satellite imagery,[7] and Claudia attained its peak intensity as a strong Category 1 hurricane with winds of 90 mph (140 km/h) early on July 4.

Progression over colder waters caused the system to weaken below hurricane strength by 00:00 UTC on July 5,[8] coincident with the eye becoming obscured on satellite.

[8] Data from a reconnaissance aircraft was used to upgrade the system to a Category 1 hurricane with winds of 75 mph (121 km/h) around 18:00 UTC on August 14;[8] this constituted the storm's peak strength.

[7] It continued generally northwestward, weakening to a tropical storm around 06:00 UTC on August 16 before making a second landfall around Punta Eugenia, Baja California Sur six hours later.

[8] Colder waters caused the system to fall to tropical depression intensity early on August 17 and dissipate around 00:00 UTC the next day while located just south of California.

[7] As Doreen moved parallel to the southwestern coastline of Mexico, it produced heavy rainfall there, with accumulations peaking at 14.80 inches (376 mm) near the Los Cabos Municipality.

[10] Despite dissipating as a tropical cyclone, the remnants of Doreen continued into the Southwest United States, resulting in maximum rainfall accumulations of 7.45 inches (189 mm) in the San Jacinto Mountains of California.

[11] Strong thunderstorms, with winds reaching up to 60 mph (97 km/h), downed trees and caused intermittent power outages in Palm Springs, California.

[12] Farther east in Las Vegas, Nevada, meanwhile, less than 2 inches (51 mm) of rain flooded major intersections and caused roofs to collapse.

Despite persistent, deep convective activity, a trek over colder waters prevented Emily from further intensifying,[7] and the system instead transitioned into an extratropical cyclone around 12:00 UTC on September 14.

The newly formed system moved west-northwest until reaching hurricane strength by 00:00 UTC on September 22,[8] at which point Florence sharply curved toward the north-northeast.

[8] A sprawling storm,[7] Heather reached hurricane strength early on October 5 and attained peak winds of 85 mph (137 km/h) by 12:00 UTC that day.

In addition, about 175 families were evacuated from Nogales; in the aftermath of the rains, residents were asked to conserve water after the city's wells were inundated with mud and rendered unusable.