Heat Advisory issued September 18 at 2:58AM CDT until September 19 at 8:00PM CDT by NWS St Louis MO
Issue date: 2026-09-18T07:58+00:00
* WHAT...Heat index values up to 107. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
