SOUTH TEXAS — The National Weather Service issued multiple flash flood warnings across South Texas on Wednesday as heavy rainfall triggered life-threatening conditions in urban and rural areas. The warnings spanned several counties surrounding San Antonio and extended westward into the Texas Hill Country and Edwards Plateau.

A flash flood warning has been issued for northwestern parts of the San Antonio metro area, including Leon Valley, Castle Hills, Hollywood Park, Helotes, and Shavano Park. Up to 3 inches of rain has already fallen in this region, with another 1 to 2 inches expected. The warning for this area remains in effect until 12:45 p.m.

Wednesday. As of 8:15 a.m. Wednesday, central and southern parts of San Antonio were not under a flash flood warning.

Additional warnings cover parts of Kendall and Bandera counties, including the cities of Boerne and Bandera. Farther west, a flash flood warning is in place for Uvalde and western Medina counties, lasting into Wednesday afternoon. This warning includes the cities of Hondo, D'Hanis, Sabinal, Knippa, Uvalde, and Utopia.

Parts of north-central Uvalde County have already received 6 inches of rain overnight and up to 18 inches in the past 24 hours. The Uvalde County warning is active until 2 p.m. Wednesday.

Eastern Kerr County and western Gillespie County, including Kerrville and Fredericksburg, are under a flash flood warning until at least 10 a.m. Wednesday. Meanwhile, parts of southern Edwards, Real, and Bandera counties—including the communities of Vanderpool, Leakey, and Camp Wood—are also under flash flood warnings. Flood warnings have been issued for the Frio, Sabinal, and Nueces rivers, which are expected to reach minor flood stage Wednesday.

The National Weather Service stated that life-threatening flash flooding is possible across creeks, streams, urban areas, highways, streets, and underpasses. Rainfall totals across the broader San Antonio area are forecast to range between 1 and 4 inches on Wednesday, with isolated higher amounts exceeding 6 inches in some locations.

The National Weather Service, a forecasting agency within the National Oceanic and Atmospheric Administration, issues flash flood warnings when flooding is imminent or occurring. These alerts are based on observed rainfall, radar estimates, and hydrological models, and are intended to prompt immediate protective action by residents and emergency managers. The concentration of warnings across multiple counties indicates a widespread and potentially dangerous hydrological event affecting both densely populated suburbs and remote rural communities.

With some areas having already received up to 18 inches of rain in 24 hours, the risk of rapidly rising water in normally dry creek beds and overwhelmed drainage systems is high. The warnings for major river systems—the Frio, Sabinal, and Nueces—signal that flooding may persist beyond the immediate flash flood threat, potentially affecting roadways, agricultural land, and low-lying infrastructure through the day.