A tropical depression has formed in the Pacific off Mexico's southwestern coast and a tropical storm warning was issued for the area.
A tropical storm watch was in effect for the Mexican coast from west of Lagunas de Chacahua to Punta Maldonado.
The depression has maximum sustained winds near 30 mph (45 kph).
Forecasters say some gradual strengthening is expected during the next 48 hours and the depression could become a tropical storm by Thursday.
The depression is centered about 100 miles (160 kilometers) south-southwest of Salina Cruz and is expected to be within the warning area over the next day or two.