Uvalde Texas Flash Flooding: Rare High Risk for Catastrophic Impacts

The Weather Prediction Center has issued a rare Level 4 of 4 high-risk flood threat for parts of South Texas, including Uvalde County, where floodwaters have already swept away vehicles and forced high-water rescues. This is the first back-to-back high-risk issuance since April 2025. Such risks occur on fewer than 4% of days per year but account for more than 80% of all flood-related damage and 36% of flood-related deaths.

Texas Governor Greg Abbott declared a disaster for 59 counties on Tuesday, activating state resources after a weekend of escalating storms. “The protection of Texans is my top priority,” Abbott said. “As severe storms and the threat of dangerous flash flooding continue across the state, this disaster declaration ensures we can rapidly deploy state resources to support local communities.”

Uvalde County: Ground Zero for Flash Flooding

Uvalde County sits squarely in the high-risk zone. Video from the Texas Game Wardens shows an unoccupied vehicle being washed away on Tuesday — the occupants were rescued shortly before it floated off. Roads are covered, and high-water rescues are ongoing. The region saw 6 to 12 inches of rain overnight into Tuesday morning, and an additional 10 or more inches could fall into Wednesday morning, with storms producing rainfall rates of 2 to 4 inches per hour.

The high-risk area stretches across the western Hill Country, the Edwards Plateau, and the Rio Grande Valley near the US-Mexico border. Wednesday’s risk zone is slightly more expansive than Tuesday’s, and the Weather Prediction Center warns of “significant to locally catastrophic flash flooding” through the period.

San Antonio and Hill Country Under Pressure

The flooding isn’t confined to Uvalde. A confirmed tornado touched down on San Antonio’s northwest side Wednesday morning, causing damage. High water has closed dozens of roads across the San Antonio area, and the city of Boerne has opened a shelter as flooding continues. Bexar County, home to San Antonio, is under both flash flood and tornado warnings.

Kerrville residents have been urged to avoid flooded roads, and thousands remain without power as storms sweep the Hill Country. The disaster declaration includes Bexar, Harris, and Travis counties, with more expected to be added as conditions evolve.

Why This Flood Threat Is Different

Back-to-back high-risk days from the Weather Prediction Center are unusual. The last time this happened was April 2025. The WPC’s own research shows that high-risk days are rare — fewer than 4% of days per year — but they cause the vast majority of flood damage and a disproportionate share of deaths. That’s because these events combine extreme rainfall rates with already saturated ground, creating conditions where creeks and rivers rise in minutes, not hours.

In Uvalde County, the Leona River and its tributaries have already overflowed. The National Weather Service has issued multiple flash flood emergencies for the area, urging residents to seek higher ground immediately.

Safety and Preparedness: What to Do Now

If you’re in or near the affected areas, here are the key steps to take:

• Never drive through flooded roads. Just six inches of moving water can knock a person down, and a foot of water can sweep away a vehicle. Turn around, don’t drown.
• Monitor local forecasts and warnings. The Weather Prediction Center updates its risk maps daily. Use the storm tracker in the CNN Weather app or your local National Weather Service office for real-time alerts.
• Have emergency supplies ready. Include water, non-perishable food, flashlights, batteries, a first-aid kit, and important documents in a waterproof bag. Charge your phone and power banks.
• Know your evacuation route. If you live in a flood-prone area, identify higher ground and plan how to get there quickly. Follow instructions from local emergency management.
• Stay informed about road closures. In Uvalde County, dozens of roads are closed. Check the Texas Department of Transportation’s DriveTexas app or local news for updates.

Governor Abbott has urged all Texans in affected areas to “monitor local weather forecasts, avoid driving through flooded roadways, and have emergency supplies ready.” The state has activated emergency resources, but individual preparedness remains the first line of defense.

What Comes Next

Up to a foot of rain is possible in parts of the Big Bend region by the end of the week, and more rain is forecast through the weekend. The stalled front and deep Gulf moisture that have fueled this event are not expected to move out quickly. That means the risk of additional flash flooding will persist, even after the immediate high-risk days pass.

For residents of Uvalde, San Antonio, and the surrounding Hill Country, the next 48 hours are critical. The combination of already saturated ground, extreme rainfall rates, and back-to-back high-risk warnings makes this one of the most dangerous flood events the region has seen in years. Stay alert, stay safe, and stay out of the water.