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HomeWeather news → NWS Issues Flash Flood Warning for Bexar and Comal Counties
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NWS Issues Flash Flood Warning for Bexar and Comal Counties

August 29, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Austin/San Antonio has issued a Flash Flood Warning for northern Bexar County and south central Comal County in Texas. The warning was issued on August 28 at 9:09 PM CDT and remains in effect until August 29 at 12:15 AM CDT.

At 9:09 PM CDT on August 28, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Rain gauge observations show between 2 and 3 inches of rain have already fallen, with additional rainfall amounts of 1 to 2 inches possible.

The National Weather Service reported that flash flooding is ongoing or expected to begin shortly. The primary threat includes life-threatening flash flooding of creeks, streams, urban areas, highways, streets, and underpasses.

Locations expected to experience flash flooding include San Antonio, Schertz, Converse, Universal City, Live Oak, Selma, San Antonio International Airport, Randolph AFB, Leon Valley, Helotes, Kirby, Alamo Heights, Windcrest, Terrell Hills, Garden Ridge, Shavano Park, Hollywood Park, and Olmos Park.

Why it is dangerous and what to do

⚠️ Safety
• Turn around, don't drown when encountering flooded roads, as most flood deaths occur in vehicles.
• Avoid driving on flooded roads and remain aware of your surroundings.
• Exercise extra caution at night when flood hazards are harder to recognize.
📊 The numbers, from wweather1 data
San Antonio: now +25°, Rain showers.
That is 2° above the August climate norm.
The record for this date is +43° (2011).
Three-day forecast: 29 August: +36°/+25° · 30 August: +36°/+24° · 31 August: +37°/+25°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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