# Extreme Heat Warning: St. Clair; Monroe; Jefferson — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/47b03b124c28143d

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-07-27 21:10 ingested 2026-07-28 08:32

[original source ↗](http://www.weather.gov/)

## extract

Extreme Heat Warning — St. Clair; Monroe; Jefferson
Severity: Severe. Certainty: Likely.
* 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.

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record.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.