"Swells generated by Bud will continue to affect portions of the coast of southwestern Mexico during the next few days", the NHC said. 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. Forecasters said the storm could strengthen a bit more before a slow weakening trend started Tuesday.
At Category 3, Bud was classified as a major hurricane.
The hurricane is moving north-west at about 10mph - a course it is expected to take until mid-week, the NHC said.
A tropical storm watch is in effect from Manzanillo to Cabo Correintes.
Rodman arrives in Singapore ahead of summit
Traffic was held up in the steamy midday sun and scores of bystanders were penned in by police when Trump went to meet Lee. The talks are expected to be devoted to the future of Pyongyang's nuclear program and the lifting of economic sanctions.
Some 3 to 6 inches of rain accumulations are expected in much of southwestern Mexico, with isolated maximum amounts of 10 inches, the NHC said in the advisory.
In an average season, the Atlantic Basin will experience 12 tropical storms, six hurricanes, and two major hurricanes.
Hurricane-force winds are extended outward up to 35 miles from the hurricane center, with tropical storm-force winds extended outward up to 125 miles. Meanwhile, Tropical Storm Aletta weakened into remnant low-pressure system in the Pacific, far from the Mexican coast.
General viewis captured of the temporary impact on the port area of Acapulco, rains that hit part of the country in the wake of Hurricane Bud, in the state of Guerrero, Mexico, June 11, 2018. It was about 600 miles (965 kilometres) southwest of the southern tip of Baja California.