Public Safety Alerts

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Public Safety Alerts

Illinois, Missouri Severe Extreme Heat Warning | Effective 07/27/2026 19:10

Extreme Heat Warning issued July 27 at 9:10PM CDT until July 28 at 7:00PM CDT by NWS St Louis MO

Event: Extreme Heat Warning

Desc: * WHAT...Dangerously hot conditions with heat index values up to 106. * WHERE...In Illinois, Monroe IL and Saint Clair IL Counties. In Missouri, Jefferson MO County. * WHEN...Until 7 PM CDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Areas: St. Clair County IL, Monroe County IL, Jefferson County MO

Severity: Severe

Urgency: Expected

Effective: Monday, July 27, 2026 - 19:10

Expires: Tuesday, July 28, 2026 - 10:15

Sender: w-nws.webmaster@noaa.gov

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

Extreme Heat Warning issued July 27 at 12:14PM CDT until July 28 at 7:00PM CDT by NWS St Louis MO

Event: Extreme Heat Warning

Desc: * WHAT...Dangerously hot conditions with heat index values up to 110 expected. * WHERE...Portions of south central and southwest Illinois and east central and southeast Missouri. * WHEN...Until 7 PM CDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Areas: Washington County IL, Randolph County IL, St. Clair County IL, Monroe County IL, Jefferson County MO, Crawford County MO, Washington County MO, St. Francois County MO, Ste. Genevieve County MO, Iron County MO, Madison County MO, Reynolds County MO

Severity: Severe

Urgency: Expected

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

Expires: Tuesday, July 28, 2026 - 04:15

Sender: w-nws.webmaster@noaa.gov

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Public Safety Alerts