Hurricane Dolly now has highest sustained winds near 75 miles per hour as it heads toward the U.S.-Mexico border and the heavily populated Rio Grande Valley.

At 8 p.m. Eastern time, the storm's center was about 130 miles east-southeast of Brownsville, Texas, and was moving northwest at about 11 miles per hour.

There's a hurricane warning for the coast of Texas from Brownsville to Corpus Christi and in Mexico from Rio San Fernando northward.

The first bands of rain began to pass over South Padre Island Tuesday afternoon and the surf continues to get rougher. Heavy downpours began moving through Brownsville by late afternoon. Forecasters predict Dolly could dump up to 20 inches of rain and bring coastal storm surge flooding up to 6 feet above normal high tide levels.