National Weather Service Issues Extreme Heat Warning for Portions of Oklahoma on Wednesday
An Extreme Heat Warning will be in effect from 11 AM to 8 PM CDT on Wednesday across 28 Oklahoma zones.
4 reports on this incident · first at Aug 18, 2026, 5:47 p.m. ET
Earlier reports
Aug 18, 2026, 8:26 p.m. ET
Extreme Heat Warning in Force Across 28 Oklahoma Counties Until 8 PM Wednesday
An Extreme Heat Warning is in force for portions of central, east central, northern, southeast, and southern Oklahoma from 11 AM CDT Wednesday, Aug. 19, 2026, until 8 PM CDT the same evening, according to the official alert record issued by the National Weather Service forecast office in Norman, Oklahoma. That record was issued at 11:32 AM CDT on Tuesday, Aug. 18, 2026, and distributed through the National Weather Service raw text product feed.
The warning ends at 8 PM CDT (20:00) on Wednesday, Aug. 19, 2026. The alert record sets no coverage beyond that hour; a reader seeing this after that time should treat the warning as expired unless the weather service has issued a further product.
The record describes dangerously hot conditions with heat index values up to 110. It lists two Extreme Heat Warnings: the first running until 8 PM CDT that evening, and the second from 11 AM to 8 PM CDT Wednesday.
The warning covers 28 zones. The counties named in the record are Grant, Kay, Garfield, Noble, Kingfisher, Logan, Payne, Canadian, Oklahoma, Lincoln, Grady, McClain, Cleveland, Pottawatomie, Seminole, Hughes, Stephens, Garvin, Murray, Pontotoc, Coal, Jefferson, Carter, Johnston, Atoka, Love, Marshall and Bryan. Cities within the warned area include Blackwell, Coalgate, Thackerville, Sulphur, Norman, Perry, Stillwater, Wewoka, Wakita, Madill, Davenport, Seminole, Wellston, Davis, Kingston, Stroud, Meeker, Marietta, Pauls Valley, Lamont, Prague, Holdenville, Blanchard, Ardmore and Duncan.
On impacts, the record states that heat related illnesses increase significantly during extreme heat and high humidity events.
The precautions given in the same record are to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Aug 18, 2026, 5:59 p.m. ET
National Weather Service Warns of Increased Heat-Illness Risk in Oklahoma
Heat-related illnesses increase significantly during extreme heat and high humidity events, according to official warning records from the National Weather Service Norman OK.
The risk comes alongside an Extreme Heat Warning scheduled from 11 AM to 8 PM CDT on Wednesday, August 19, 2026. The advisory covers 28 counties across central, east central, northern, southeast, and southern Oklahoma, where dangerously hot conditions are expected to produce heat index values up to 110.
Cities included in the warning area are Norman, Stillwater, Ardmore, Duncan, Perry, and Seminole. National Weather Service records advise residents to drink plenty of fluids, stay in air-conditioned rooms, remain out of the sun, and check up on relatives and neighbors.
Aug 18, 2026, 5:47 p.m. ETFirst report
Extreme Heat Warning in Force for 28 Oklahoma Counties Wednesday, 11 AM to 8 PM CDT
An Extreme Heat Warning covers portions of central, east central, northern, southeast, and southern Oklahoma on Wednesday, August 19, 2026, according to the official warning product issued by the National Weather Service Norman OK at 11:32 AM CDT on August 18, 2026.
That record carries the headline "EXTREME HEAT WARNING IN EFFECT FROM 11 AM TO 8 PM CDT WEDNESDAY." The warning begins at 11:00 AM CDT on August 19, 2026, and ends at 8:00 PM CDT the same day. The same product describes an earlier Extreme Heat Warning running until 8 PM CDT the evening it was issued, with dangerously hot conditions and heat index values up to 110 for both periods.
The weather service record puts 28 zones under the warning. The counties listed are Grant, Kay, Garfield, Noble, Kingfisher, Logan, Payne, Canadian, Oklahoma, Lincoln, Grady, McClain, Cleveland, Pottawatomie, Seminole, Hughes, Stephens, Garvin, Murray, Pontotoc, Coal, Jefferson, Carter, Johnston, Atoka, Love, Marshall, and Bryan. Cities named in the warning area include Blackwell, Coalgate, Thackerville, Sulphur, Norman, Perry, Stillwater, Wewoka, Wakita, Madill, Davenport, Seminole, Wellston, Davis, Kingston, Stroud, Meeker, Marietta, Pauls Valley, Lamont, Prague, Holdenville, Blanchard, Ardmore, and Duncan.
On the danger, the record states that heat related illnesses increase significantly during extreme heat and high humidity events. The National Weather Service advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors.
Was this report accurate and useful?
Sources
Revision history
- Version 119 Aug 2026, 00:56current
First published.
- Version 118 Aug 2026, 21:59current
First published.
- Version 118 Aug 2026, 21:47current
First published.
- Version 119 Aug 2026, 00:26current
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.