Extreme Heat Warning: Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson

source: us-gov-api (us-gov-api:noaa-weather)published 2026-09-04 14:49ingested 2026-09-05 02:54

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Extreme Heat Warning — Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions with heat index values up to 108. * WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

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The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.