Heat Advisory issued September 19 at 4:15AM CDT until September 19 at 8:00PM CDT by NWS St Louis MO

**Heat Advisory issued September 19 at 4:15AM CDT until September 19 at 8:00PM CDT by NWS St Louis MO**

* WHAT...Heat index values up to 101.

* WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri.

* 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 19, 2026 4:15 AM UTC

- **Expires:** Sep 19, 2026 7:15 PM UTC

*This alert was automatically distributed from the National Weather Service via the IPAWS All-Hazards Information Feed.*