More than 3,400 in several counties in South Texas remained without power on Friday afternoon, according to AEP Texas. A flood warning was still in effect for portions of South Texas, including Cameron, Hidalgo and Willacy counties, through early Friday afternoon, according to the National Weather Service.

Severe flooding in South Texas has left at least four people dead and forced emergency crews to rescue hundreds of people from rising waters. State officials say the Rio Grande Valley endured more than half of a year’s worth of rain within the span of 48 hours last week, leading to submerged roads and waterlogged vehicles.

The region has endured severe thunderstorms since Wednesday, with some parts of the Rio Grande Valley seeing half a year’s worth of rain in a span of 48 hours.