Heat Advisory for Northern Hill Country, I-35 Corridor, Coastal Plains Through Friday
The National Weather Service has issued a Heat Advisory for 33 zones across south central and southeast Texas, including the northern Hill Country, I-35 corridor, and coastal plains, with heat indices up to 108°F.
3 reports on this incident · first at Aug 19, 2026, 4:39 p.m. ET
Earlier reports
Aug 24, 2026, 11:10 p.m. ET
Heat Advisory for South Central and Southeast Texas: Feels-Like Temperatures Up to 108°F
The National Weather Service has issued a Heat Advisory for portions of south central and southeast Texas, warning that heat indices will approach 105 to 108°F for several hours from 1–7 pm, according to fox7austin.com. The advisory covers the northern Hill Country, the I-35 corridor, and coastal plains, and is in effect from noon Thursday, August 20, through 7 PM CDT Friday, per the advisory record.
The advisory lists 33 zones, including 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, according to the advisory record.
Officials advise pre-hydrating ahead of going out in the heat, wearing sunscreen, wearing light-colored, loose-fitting clothing, and limiting activities to early morning and evening, as reported by fox7austin.com. Separately, fox26houston.com recommends continuing to practice sun and heat safety by wearing sunscreen and drinking plenty of water, and avoiding long periods outside during the hottest part of the day.
The advisory was issued at 11:55 AM CDT on August 19, according to the advisory record. The end time is disputed: fox7austin.com reports the advisory ends at 7 PM CDT Friday, while fox26houston.com reports it extends through 7 PM Tuesday, August 25.
Aug 19, 2026, 4:39 p.m. ETFirst report
Heat Advisory for Houston, Trinity, Madison and 30 More Texas Zones Through 7 PM Friday
A Heat Advisory is in effect for 33 zones across portions of south central and southeast Texas, including Houston, Trinity and Madison, from noon Thursday to 7 PM CDT Friday.
The advisory — a National Weather Service Houston 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 "HEAT ADVISORY IN EFFECT FROM NOON THURSDAY TO 7 PM CDT FRIDAY."
According to the advisory, heat index values between 106 and 110 are expected. The National Weather Service Houston states that hot temperatures and high humidity may cause heat illnesses.
The zones listed in the advisory 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 advisory 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 advisory 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.
Was this report accurate and useful?
Sources
- Houston weather: Heat advisory extended through Tuesdayfox26houston.com
- Austin weather: Heat Advisory to be in effect through the weekendfox7austin.com
Revision history
- Version 125 Aug 2026, 03:10current
First published.
- Version 119 Aug 2026, 20:39current
First published.
- Version 125 Aug 2026, 03:15current
First published.
How we work
This site models an investigative reporter rather than a wire desk. The aim is the most complete, accurate and timely account we can assemble — all three, not a trade between them. Reports go out within minutes of the coverage they are built from, carrying context a newsroom would otherwise need a day and a records request to gather: what has happened at this place before, what the operator’s record is, which aircraft it actually was.
Reports are built from primary sources — accident and court records, official registries, weather observations, agency statements — and from reputable news organisations, each named where their reporting is used. Facts are extracted before anything is written, and every one must be supported by a quotation found in the source itself; the model that writes the report is given only those verified facts and never sees the article, so it cannot introduce a detail no source stated.
Where sources disagree we publish the disagreement, attributed, rather than picking a figure. Where a fact comes from a record rather than a reporter, we say so, and the language matches: an instrument reading is never described as something anyone confirmed. Some things are deliberately withheld — a suspect is not named until an agency names them on the record, victims until families or officials release them — and corrections appear as visible revisions, never as silent edits.
None of that makes a report true. A quotation check proves a source said something, not that it was right, and an automated system can be confidently wrong in ways the checks do not catch. If something here is wrong, the feedback above is how it gets found. The full methodology, including what we refuse to publish.