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Illinois, Missouri Severe Extreme Heat Warning | Effective 07/27/2026 10:14

Extreme Heat Warning issued July 27 at 12:14PM CDT until July 27 at 9:00PM CDT by NWS St Louis MO

Event: Extreme Heat Warning

Desc: * WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...Portions of south central, southwest, and west central Illinois and central and northeast Missouri. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Areas: Greene County IL, Macoupin County IL, Montgomery County IL, Fayette County IL, Adams County IL, Brown County IL, Pike County IL, Calhoun County IL, Jersey County IL, Knox County MO, Lewis County MO, Shelby County MO, Marion County MO, Monroe County MO, Ralls County MO, Pike County MO, Audrain County MO

Severity: Severe

Urgency: Expected

Effective: Monday, July 27, 2026 - 10:14

Expires: Monday, July 27, 2026 - 19:00

Sender: [email protected]

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Public Safety Alerts