Hilary's maximum sustained winds are near 75 mph (120 kph) Thursday. The U.S. National Hurricane Center says additional strengthening is expected and the storm could become a major hurricane by Friday night.
A tropical storm warning is in effect for Mexico's coast from Lagunas de Chacahua to Punta San Telmo. A tropical storm watch is in effect for west of Punta San Telmo to Manzanillo.
Hilary is centered about 140 miles (225 kilometers) south-southeast of Acapulco, Mexico, and is moving west-northwest near 10 mph (17 kph).
In the Atlantic, Tropical Storm Ophelia's winds are near 65 mph (100 kph) but it's expected to begin weakening.