Extreme Heat Warning Issued for Montague, Cooke, Grayson and 25 More North Texas Counties
The National Weather Service Fort Worth TX alert covers 28 zones, from Bowie and Gainesville to Fort Worth and Sherman, with temperatures up to 108 expected Tuesday afternoon.
By AI ReporterWritten Aug 17, 2026, 1:54 p.m. ET
Developing · checked 13h ago
Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.
We last searched for new coverage of this at Aug 17, 2026, 8:11 p.m. ET — checked 13h ago.
The issued an and a Heat Advisory on August 18, 2026, for portions of North Texas, according to the alert product filed by that office and distributed through the National Weather Service raw data feed.
The record lists Montague, Cooke, Grayson, Fannin, Lamar, Young, Jack, Wise, Denton, Collin, Hunt, Delta, Hopkins, Stephens, Palo Pinto, Parker, Tarrant, Dallas, Rockwall, Kaufman, Van Zandt, Rains, Eastland, Erath, Hood, Somervell, Johnson and Ellis — zones in all. Cities named in the same record include Bowie, Gainesville, Sherman, Bonham, Commerce, Greenville, Emory, East Tawakoni, Terrell, Forney, Kaufman, Heath, Rockwall-area Heath, Frisco, Allen, Flower Mound, Denton-area Bridgeport, Jacksboro, Breckenridge, Cisco, Weatherford, Oak Trail Shores, Granbury, Glen Rose, Waxahachie and Fort Worth.
The Heat Advisory runs until noon CDT Tuesday. The takes effect at noon CDT and expires at 8:00 PM CDT on August 18, 2026.
Under the Heat Advisory, the record gives heat index values up to 106. Under the , it describes dangerously hot conditions with temperature values up to 108 expected.
The alert states that heat related illnesses increase significantly during extreme heat and high humidity events, and that hot temperatures and high humidity will increase the risk for heat-related illnesses to occur, particularly for those working or participating in outdoor activities.
Precautions listed in the record: stay hydrated, wear lightweight and loose fitting clothing, and limit strenuous activities to the early morning or evening. Check up on relatives and neighbors. Never leave young children or pets in an enclosed vehicle, even for a short time, as temperatures can quickly rise to life-threatening levels. Know the signs and symptoms of heat exhaustion and heat stroke. The alert notes that the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments to reduce risk outdoors, and that anyone overcome by heat should be moved to a cool and shaded location.
"Heat stroke is an emergency!" the alert says. Call 911 as soon as possible if you or someone you know is exhibiting signs of heat stroke.
The record also warns that extreme heat is dangerous, especially for those without reliable shelter, and advises limiting time outdoors during the hottest part of the day, typically from 2 to 7 PM, resting in the shade when possible and drinking plenty of water. Cooling centers can be located through local resources or by dialing 2-1-1 in Texas.
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