Storms bring flooding rains to San Antonio metro area

Tropical moisture coincided with a slow-moving frontal boundary Wednesday night/early Thursday

Radar-Estimated 24 Hour Rainfall Totals (Copyright 2021 by KSAT - All rights reserved.)

SAN ANTONIO – This week has given us a full spectrum of weather, from cold fronts to tropical systems and heavy rainfall.

Heavy rain and strong thunderstorms Wednesday night and Thursday morning resulted in flash flooding across parts of the KSAT viewing area - especially across parts of Comal, Guadalupe, Wilson, and Gonzlaes counties.

However, we’re not done with weather changes just yet! Here’s what you need to know as the weekend approaches:

  • Thursday: Rain will have ended across the KSAT viewing area by midday. However, there could be lingering issues and high water spots into the afternoon -- especially near swollen creeks and rivers.
  • Thursday Night: As things stay soupy, low clouds and fog will develop by the pre-dawn hours of Friday morning.
  • Friday: A cold front will finally surge through the entire area during the day. While a couple of showers are possible as the front passes by, there will not be much rain around. Behind the front, expect gusty winds, cooler temperatures, and drier air.
The forecast wind gusts behind Friday's cold front (Copyright 2021 by KSAT - All rights reserved.)
  • The Weekend: We’ll get a good taste of fall like weather behind Friday’s front. It will be a bit windy through the first part of the day Saturday. However, skies will be mostly sunny and highs will only be in the 70s! Sunday will feature a few more clouds, but it’ll still be a very comfortable day.
The latest Planning Forecast for the San Antonio area (Copyright 2021 by KSAT - All rights reserved.)

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About the Authors:

Justin Horne is a meteorologist and reporter for KSAT 12 News. When severe weather rolls through, Justin will hop in the KSAT 12 Storm Chaser to safely bring you the latest weather conditions from across South Texas. On top of delivering an accurate forecast, Justin often reports on one of his favorite topics: Texas history.

Sarah Spivey is a San Antonio native who grew up watching KSAT. She has been a proud member of the KSAT Weather Authority Team since 2017. Sarah is a Clark High School and Texas A&M University graduate. She previously worked at KTEN News. When Sarah is not busy forecasting, she enjoys hanging out with her husband and cat, and playing music.