Tropical Storm Hilary could become a hurricane (AP)

MIAMI ? Tropical Storm Hilary has strengthened in the Pacific south of Mexico and could soon become a hurricane.

Hilary's maximum sustained winds Thursday are near 70 mph (110 kph). The U.S. National Hurricane Center says Hilary could become a hurricane later in the day and could become a major hurricane by Saturday.

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 90 miles (145 kilometers) south of Punto Maldonado, Mexico, and is moving west-northwest near 9 mph (15 kph).

In the Atlantic, Tropical Storm Ophelia's winds have increased to 65 mph (100 kph) but it's expected to begin weakening.

Source: http://us.rd.yahoo.com/dailynews/rss/weather/*http%3A//news.yahoo.com/s/ap/20110922/ap_on_re_us/tropical_weather

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