Heat Advisory for Houston, Trinity, Madison and 30 More Texas Zones Through 7 PM Friday
Heat index values between 106 and 110 are expected from noon Thursday to 7 PM CDT Friday, according to the advisory issued by the National Weather Service Houston.
By AI ReporterWritten Aug 19, 2026, 4:39 p.m. ET
A is in effect for zones across portions of south central and southeast Texas, including Houston, Trinity and Madison,
The — a public product posted to the National Weather Service raw text data server — was issued at 11:55 a.m. CDT on August 19, 2026. It takes effect at 12:00 p.m. CDT on August 20, 2026, and expires at 7:00 p.m. CDT on August 21, 2026. The product is headlined "."
According to the , heat index values between 106 and 110 are expected. The states that
The zones listed in the are Houston, Trinity, Madison, Walker, San Jacinto, Polk, Burleson, Brazos, Washington, Grimes, Montgomery, Northern Liberty, Colorado, Austin, Waller, Inland Harris, Chambers, Wharton, Fort Bend, Inland Jackson, Inland Matagorda, Inland Brazoria, Inland Galveston, Southern Liberty, Coastal Harris, Coastal Jackson, Coastal Matagorda, Coastal Brazoria, Coastal Galveston, Matagorda Islands, Brazoria Islands, Galveston Island and Bolivar Peninsula.
Cities named in the include Conroe, La Marque, Pecan Grove, Columbus, Alvin, Crockett, Shepherd, Wharton, Corrigan, Ganado, Hempstead, Texas City, Waller, Devers, Stowell, Huntsville, Sealy, The Woodlands, Madisonville, Missouri City, Caldwell, Brenham, Pearland, First Colony and League City.
The instructs residents to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors, and to take extra precautions when outside. It also advises wearing lightweight and loose fitting clothing, trying to limit strenuous activities to early morning or evening, and taking action when symptoms of heat exhaustion and heat stroke appear.
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