Updated

Forecasters say the second tropical depression of the Atlantic hurricane season has formed over the western Gulf of Mexico.

The National Hurricane Center issued a tropical storm warning Wednesday for the Texas coast south of Baffin Bay to the mouth of the Rio Grande. In Mexico, a warning is out from Rio San Fernando to the Rio Grande.

The Rio Grande is already high because of drenching rains from last week's Hurricane Alex. And reservoirs along the U.S.-Mexico border have risen to their highest levels in decades.

The depression was about 265 miles (425 kilometers) east-southeast of Brownsville, Texas, and 245 miles (395 kilometers) east of La Pesca, Mexico. Maximum sustained winds are about 35 mph (55 kph).

Forecasters say it could become a tropical storm before hitting land and dump more rain along the Mexico-Texas coast.