Thunderstorm warnings and flood advisories were issued throughout parts of the Rio Grande Valley on Sunday.
The National Weather Service had issued a flood advisory for Cameron County.
The National Weather Service warns of torrential rainfall and frequent lightening strikes.
Strong storms could produce dime sized hail, according to the National Weather Service.
Gusts of winds may reach up to 30-40 miles per hour.
Rainfall totals between one and two inches can be expected in the heaviest downpours.
Motorists are advised to be careful on flooded streets, especially at intersections with high water.
AEP is reporting up to 4,500 homes across the Rio Grande Valley without power.
Action 4 News will continue to provide the latest weather updates.