Tropical Storms Juliette, Octave, and Sonia also made landfall in Baja California or northwestern Mexico, bringing with them heavy rains and strong winds.

Following the passage of an atmospheric kelvin wave, a broad area of low pressure formed and gradually organized as convection simultaneously increased.

Steered northeastward amid favorable atmospheric conditions, a period of rapid deepening ensued, and the system was upgraded to a Category 1 hurricane at 18:00 UTC on May 29.

[18] Even though Hurricane Barbara struck a largely undeveloped stretch of coastal lagoons, containing small fishing villages,[19] two elderly people were killed in Oaxaca.

Steered northwest and eventually west-northwest, the cyclone intensified amid favorable atmospheric dynamics, becoming a minimal hurricane by 12:00 UTC on June 25 and attaining peak winds of 85 mph (135 km/h) twelve hours later.

After attaining peak winds of 80 mph (130 km/h) six hours later, the influence of drier air and increasing shear caused the storm to begin a weakening trend.

After becoming devoid of convection, Dalila degenerated into a remnant low at 06:00 UTC on July 7 while located roughly 460 mi (740 km) south-southwest of Cabo San Lucas, Mexico.

Initially, moderate easterly shear prevented much organization as the system tracked west-northwest; however, a reprieve in upper-level winds by 0000 UTC on July 5 allowed the depression to intensify into Tropical Storm Erick as convective bands gained more curvature.

A period of steady intensification over the next day allowed the system to attain Category 1 hurricane intensity at 0600 UTC and reach its peak with winds of 80 mph (130 km/h) and a minimum barometric pressure of 983 mbar (983 hPa; 29.0 inHg) six hours later.

Steered westward amid a favorable environment, the cyclone steadily intensified, attaining peak winds of 70 mph (115 km/h) at 12:00 UTC on July 27 as an eye became evident on satellite imagery.

At 00:00 UTC on July 30, the system weakened to a tropical depression; twelve hours later, it degenerated into a remnant low while located near the northern coast of Kauai.

[57] Following Flossie's crossing into the Central Pacific Hurricane Center's warning zone, a tropical storm watch was issued for Hawaii and Maui counties on July 27.

With a small circulation, the cyclone entered a period of rapid deepening, intensifying into a Category 1 hurricane at 18:00 UTC on July 31 and attaining peak winds of 85 mph (135 km/h) a day later.

By 18:00 UTC on August 11, the effects of increasing wind shear caused Henriette to degenerate into a remnant low while positioned roughly 430 mi (690 km) south of Kailua-Kona, Hawaii.

[66] On August 10, the CPHC began monitoring a trough located roughly 1,300 mi (2,100 km) east-southeast of the Big Island of Hawaii for potential development.

Resuming its northwest track around a mid-level ridge across the central United States and Mexico, Ivo attained peak winds of 45 mph (70 km/h) before crossing a sharp sea surface temperature gradient.

[81] In the United States, flash flood watches were issued for Pima County,[82] extending westward across western Arizona[83] and into Southern Nevada.

Heavy rains in Nevada, amounting to nearly 4 in (100 mm) at Mount Charleston, caused significant flooding; damage in the Las Vegas Valley reached $300,000.

Lorena weakened to a tropical depression at 12:00 UTC on September 7 and degenerated into a remnant low six hours later while located 60 mi (95 km) west-southwest of Santa Fe, Mexico.

Amid a favorable environment, the cyclone steadily intensified after designation, attaining peak winds of 65 mph (105 km/h) by 18:00 UTC on October 7 as a partial eyewall became evident on satellite.

While passing south of the coastline of Mexico, the wave interacted with a large area of disturbed weather at the base of an upper-level trough, and the two features eventually merged by October 7.

Gradually recurving northeast around a subtropical ridge, the cyclone steadily strengthened amid a favorable atmospheric environment, reaching a peak intensity of 65 mph (105 km/h) by 18:00 UTC on October 13.

The system moved ashore near Cabo San Lazaro, Mexico at 05:00 UTC on October 15 with maximum winds of 45 mph (70 km/h) and quickly weakened over land.

[108] An area of convection, possibly in relation to a tropical wave that emerged off the western coast of Africa on September 16, developed along the ITCZ on October 7.

Despite this, it acquired sufficient organization to be deemed a tropical depression by 00:00 UTC on October 14 while located about 810 mi (1,300 km) south-southwest of the southern tip of Baja California.

Steered northwest and north around a mid-level ridge over Mexico, the depression became a tropical storm by 06:00 UTC and attained peak winds of 45 mph (70 km/h) six hours later.

[109] A disturbance within the ITCZ was first identified over the southwestern Caribbean Sea on October 13, crossing Central America and entering the East Pacific over the subsequent three days.

Executing a clockwise loop, significant cold water upwelling and increased upper-level winds caused the cyclone to weaken abruptly, deteriorating to tropical storm intensity by 06:00 UTC on October 23.

[116] A strong upward pulse of the Madden–Julian oscillation pushed across the East Pacific during the last week of October, yielding the formation of a broad area of low pressure.

Gradually recurving northeast in response to a series of troughs to the system's north, the cyclone only slowly organized under moderate wind shear, and the depression intensified into Tropical Storm Sonia by 00:00 UTC on November 3.