MIAMI (AP) — The U.S. National Hurricane Center says Tropical Storm Raymond is churning in the Pacific off southern Mexico.

The Miami forecasting center said Raymond had maximum sustained winds of 40 mph early Sunday and was centered about 180 miles south-southwest of Acapulco, Mexico. It is moving toward the northwest near 7 mph.

Forecasters say Raymond is expected to slowly approach Mexico's southern Pacific coast Mexico late Monday or Tuesday and then begin to meander. The center says Raymond is expected to become a hurricane in the coming 48 hours.

Forecasters warn heavy rainfall is possible along the south-central Mexican coast in coming days and could cause life-threatening flash floods and mudslides. A tropical storm watch is in effect from Acapulco to Lazaro Cardenas, Mexico.