Heat Advisory issued August 18 at 1:48PM CDT until August 19 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 104.

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

* WHEN...Until 8 PM CDT Tuesday.

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