CNN — Tropical Storm Raymond churned slowly north Sunday off Mexico's Pacific coast, threatening to dump heavy rain.
A tropical storm watch was in effect from Acapulco to Lazaro Cardenas, according to the National Hurricane Center.
The storm is forecast to become a hurricane on Monday.
As of Sunday about midday, Raymond was 180 miles southwest of Acapulco. It had maximum sustained winds of 50 mph and was moving northwest at 6 mph.
The storm is forecast to near the coast within the watch area late Monday or Tuesday. It is expected to take a sharp turn west before it has a chance to reach land, the hurricane center said.
Raymond could dump heavy rain along the south-central coast of Mexico, an area hit hard by another storm in September.
That storm, Manuel, triggered deadly mudslides and left about 40,000 tourists stranded in Acapulco, a popular tourist destination.