Tracking northwest, the system continued to intensify over warm ocean waters, and an eye became evident on weather satellite. This development coincided with a ship report of winds, and Aletta strengthened into the season's first hurricane by 00:00 UTC on May 31. The system subsequently weakened as it curved north-northwest ahead of an upper-level trough over northwestern Mexico, and it made landfall about west of Zihuatanejo, Guerrero, at 17:30 UTC on May 31. Aletta transitioned to an extratropical cyclone about six hours later before it degenerated to a disturbance over southwestern Mexico on June 1. Tropical Storm Bud The season's second tropical cyclone began as a disturbance spawned by an African tropical wave southwest of the Mexico coastline on June 15. It moved generally westward over very warm waters, and observations from satellite imagery and ships outlined the formation of a tropical depression by 00:00 UTC on June 17. Six hours later, the depression intensified into Tropical Storm Bud. Continued ship observations relayed Bud's intensification to a cyclone on June 18, but the storm weakened thereafter as it moved west-northwest under the influence of a ridge, and it ultimately dissipated within the ITCZ after 06:00 UTC on June 26 while located over the open Central Pacific. Hurricane Carlotta To the east of Tropical Storm Bud, a new tropical disturbance – originating as a Caribbean ITCZ disturbance – was identified south of Acapulco, Guerrero, on June 15. The comparatively small system became a tropical depression around 06:00 UTC on June 17 and Tropical Storm Carlotta eighteen hours later while it moved over warm ocean waters. After formation, Carlotta embarked toward the west-southwest, steered by the same ridge that directed Bud. The storm displayed a small eye in satellite imagery early on June 19, and it was upgraded to a hurricane by 06:00 UTC that day. Carlotta continued to intensify as it curved west-northwest, becoming the season's first major hurricane around 06:00 UTC on June 20 and ultimately peaking as a Category 4 hurricane with winds of by 12:00 UTC on June 21. Carlotta maintained its strength for a time before it encountered cooler waters and dry air on June 23. The cyclone steadily lost strength and degenerated to a disturbance after 18:00 UTC on June 25 but remained a traceable entity as it moved across the Central Pacific. The disturbance moved across the Hawaiian island chain on June 28 and continued