Heat Advisory issued September 18 at 2:00PM CDT until September 18 at 8:00PM CDT by NWS St Louis MO
* WHAT...Heat index values up to 105. * WHERE...In Illinois, Fayette IL, Montgomery IL, Calhoun IL, Greene IL, Jersey IL, and Macoupin IL Counties. In Missouri, Boone MO, Callaway MO, Lincoln MO, and Montgomery MO Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and hi...
**Heat Advisory issued September 18 at 2:00PM CDT until September 18 at 8:00PM CDT by NWS St Louis MO**
* WHAT...Heat index values up to 105.
* WHERE...In Illinois, Fayette IL, Montgomery IL, Calhoun IL, Greene IL, Jersey IL, and Macoupin IL Counties. In Missouri, Boone MO, Callaway MO, Lincoln MO, and Montgomery MO Counties.
* WHEN...Until 8 PM CDT this evening.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
**What You Should Do:**
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
**Alert Details:**
- **Severity:** Moderate
- **Urgency:** Expected
- **Issued by:** NWS St Louis MO
- **Effective:** Sep 18, 2026 2:00 PM UTC
- **Expires:** Sep 18, 2026 8:00 PM UTC
*This alert was automatically distributed from the National Weather Service via the IPAWS All-Hazards Information Feed.*
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