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TTR Weekend Weather Update for De Witt, Fayette, Gonzales, and Lavaca Counties from the National Weather Service.

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…Warm conditions Friday through Sunday with Elevated Heat Index Values…

…Storms with Locally Heavy Rainfall Possible Sunday Afternoon through Monday across the Rio Grande and western Hill Country…

Area of Concern:

Heat: All of South-Central Texas, especially areas outside of the Hill Country.
Locally Heavy Rainfall: Rio Grande and western Hill Country

Frfi-Sun Heat Index Sun-Mon Rainfall

Threats & Impacts:

Heat Indices: Peak values of 100-108 degrees each afternoon Friday-Sunday. Prolonged exposure to this excessive heat could lead to dehydration and heat exhaustion.

Rainfall: 1-3 inches across the Rio Grande and western Hill Country late Sunday through Monday. Isolated higher amounts likely. This could lead to localized flash flooding of smaller creeks, streams, and low water crossings. The most susceptible rivers where isolated minor to moderate flooding is possible will be the Rio Grande, Upper Nueces, and Fro Rivers.

Timing and Overview:

Heat will be the main story for the first half of the holiday weekend across South Central Texas. Heat index values each afternoon Friday through Sunday are forecast to peak around 100 to 108 degrees for locations outside the Hill Country. With this being the Memorial Holiday Weekend please be extra vigilant with prolonged heat exposure and take frequent breaks out of the direct sunlight and heat.

As we get into late Sunday and Monday rain chances will increase, especially across western areas of the Hill Country and Rio Grande. Models have been keying in on a possible round of showers and storms that could bring locally heavy rainfall to this region. Farther east it is too soon to determine any types of impacts from heavy rainfall, if any, as forecast confidence decreases beyond Monday.

Stay tuned through the holiday weekend for updates on rainfall chances and potential impacts as forecast confidence increases.


Heat: High
Locally Heavy Rainfall: Low to Moderate

Additional Information Resources:
NWS Austin / San Antonio Webpage: https://www.weather.gov/sanantonio
Heat and Safety Tips: https://www.nws.noaa.gov/os/heat/
AHPS River Forecasts: https://water.weather.gov/ahps2/index.php?wfo=ewx

Jason Runyen
NWS Austin / San Antonio


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