South Texas is bracing for heavy rainfall beginning Monday, with forecasters warning of isolated flooding risks across several counties. The National Weather Service has issued flash flood watches for parts of the region, citing slow-moving storm systems capable of producing intense downpours in short periods.
Residents in areas including San Antonio, Corpus Christi, and the Rio Grande Valley are urged to monitor conditions closely, as rainfall totals could exceed 3 inches in localized spots. While widespread flooding is not expected, low-lying areas and urban centers with poor drainage may experience temporary water accumulation.
The storm system is expected to move in from the Gulf of Mexico, drawing moisture from warm sea surface temperatures. According to the National Weather Service office in Austin/San Antonio, atmospheric conditions are favorable for training thunderstorms—where multiple storms pass over the same area—increasing the risk of flash flooding.
Flash Flood Watch Issued for Multiple Counties
As of Sunday evening, flash flood watches were active for Bexar, Comal, Guadalupe, Webb, and Hidalgo counties, among others. The watch remains in effect from Monday morning through Tuesday evening, with the highest risk period expected between 6 a.m. And 6 p.m. On Monday.
“We’re watching for the potential of rainfall rates exceeding 2 inches per hour in some spots,” said a meteorologist with the NWS Austin/San Antonio office in a briefing statement. “That’s fast enough to overwhelm drainage systems quickly, especially in urban areas.”
The agency advises against driving through flooded roadways, noting that just 6 inches of moving water can knock down an adult, and 12 inches can sweep away a slight vehicle. Officials recommend turning around instead of attempting to cross flooded streets.
Preparations Underway in Vulnerable Communities
Local emergency management offices have begun staging resources in anticipation of potential water rescues and road closures. In San Antonio, the Office of Emergency Management reported pre-positioning sandbags at key flood-prone locations and coordinating with public works teams to monitor drainage infrastructure.
In the Rio Grande Valley, Hidalgo County officials said they are reviewing emergency response plans and ensuring communication channels remain open with the National Weather Service and state emergency management.
While no mandatory evacuations have been issued, authorities encourage residents in historically flood-prone zones to prepare emergency kits, charge devices, and stay informed through official channels such as local news, weather apps, and county alert systems.
What to Watch Next
Forecasters will continue to monitor the storm’s progression through radar and satellite data, with updates expected every few hours. The flash flood watch could be upgraded to a warning if rainfall exceeds thresholds or if flooding is observed.
After the system moves out, the National Weather Service will assess rainfall totals and potential impacts. Any significant flooding would be followed by damage assessments and coordination with state and federal agencies if needed.
Stay tuned to local forecasts and heed any warnings issued by emergency management officials. For real-time updates, visit the National Weather Service website or follow your local emergency management office on social media.
If you have information or observations about flooding in your area, consider sharing them safely and responsibly to help others stay informed. Stay safe, and don’t drive through floodwaters.
