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Click here to see pictures of the weather damage in Monterrey, Mexico.

Alex has already dumped more than half a foot of rain on the Rio Grande Valley. The National Weather Service in Brownsville said flash flooding and coastal flooding will continue to be a concern throughout the day.

However, forecasters say Alex will continue to weaken within the next two day as it moves further inland.

No injuries were reported as Alex drenched parts of the Rio Grande Valley. Forecasters say the Brownsville area received about 6 inches of rain in the 24-hour period ending Thursday morning.

The Department of Transportation said the Queen Isabella Memorial Causeway, linking tourist-popular South Padre Island to the rest of Texas, reopened shortly before 8 a.m. Thursday.

In Louisiana, the high tides from the hurricane destroyed 1,000 feet of a sand wall the Louisiana National Guard built in Cameron Parish as a barrier against oil from the BP well.

KPLC-TV reports a tide 3 feet above normal seeped through the barriers Wednesday and washed the sand away. Alex came ashore Wednesday night south of Brownsville, Texas. Its northern edge lashed the Louisiana coast.

Clifton Hebert of the parish Office of Emergency Preparedness said it takes weeks for sand to compact in fabric-lined wire mesh baskets. The National Guard had built about 2 miles of a planned 8-mile barrier.

Cameron is in western Louisiana at the Texas border. No oil from the BP well has been reported there.

The parish has some of the state's few recreational beaches.

The Associated Press contributed to this report.