Pere Marquette State Park

Heat Advisory issued September 1 at 3:22AM CDT until September 4 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 105. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.