Tropical Storm Patricia picked up strength off southern Mexico on Wednesday, prompting officials to issue a hurricane warning for parts of the country's Pacific coast.

Patricia had maximum sustained winds near 60 mph (95 kph) and was forecast to strengthen further into a hurricane Thursday and make landfall Friday, according to the U.S. National Hurricane Center in Miami.

A hurricane warning was in effect for the Mexican coast from Cabo Corrientes to Punta San Telmo, a stretch of coastline that includes the port city of Manzanillo.

A tropical storm warning was declared from Punta San Telmo east to Lazaro Cardenas.

The storm's center was about 265 miles (425 kilometers) south of Acapulco with westward movement near 16 mph (26 kph).

The Hurricane Center said Patricia was expected to bring heavy rain to the states of Jalisco, Colima, Michoacan and Guerrero.