Heat Advisory issued August 16 at 3:38AM CDT until August 18 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 107.

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

* WHEN...Until 8 PM CDT Monday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.