A second system, Hurricane Bud, has since developed in the same region and is expected to send moist, humid air streaming into Southern California late this week. The storm peaked on Friday as a Category 4 hurricane with winds of 140 miles per hour (220 kph).
Bud has 120 miles per hour maximum sustained winds and was moving northwest at 7 miles per hour, the NHC said.
The hurricane is moving north-west at about 10mph - a course it is expected to take until mid-week, the NHC said.
While the storm may strengthen again today, it will likely begin weakening as early as tomorrow tomorrow. It is expected to bring rain to much of southwestern Mexico, with isolated amounts of 10 inches. "These rains could cause life-threatening flash floods and mudslides", the agency warned.
The swell also will generate strong rip and side currents, creating hazardous conditions for swimmers and surfers.
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A tropical storm watch is in effect between Manzanillo, Colima, and Cabo Corrientes.
An area of clouds, rain, and low pressure in the southern Caribbean Sea has a small chance of becoming a tropical depression or tropical storm in the next 5 days.
Hurricane forecasters are watching another blob of showers and thunderstorms in what's turning out to be a messy start to the Atlantic hurricane season.
The center said the hurricane's core was moving farther from Mexico's southwestern coast but still could generate unsafe heavy surf and rip currents over the coming days.
By Saturday, Aletta dropped back down to tropical storm status, AccuWeather reported.