In the Pacific, Tropical Storm Fausto was expected to strengthen and become a hurricane by Monday night, the National Hurricane Center said.

MIAMI — Tropical Storm Fausto formed Sunday well off Mexico’s southwest Pacific coast, while a tropical depression meandering in warm Gulf of Mexico waters south of the Florida Panhandle was threatening to strengthen into a named storm.

Fausto emerged from a tropical depression about 750 miles south-southwest of the southern tip of Mexico’s Baja California peninsula and was expected to undergo steady or rapid strengthening and become a hurricane by Monday night, the U.S. National Hurricane Center said.

The storm had maximum sustained winds of 40 mph and was moving to the west-northwest at 13 mph. No coastal watches or warnings were in effect.