Heat Advisory issued July 21 at 2:02PM CDT until July 23 at 8:00PM CDT by NWS

...HEAT ADVISORY IN EFFECT FROM NOON FRIDAY TO 8 PM CDT SATURDAY... * WHAT...Heat index values up to 109 expected. * WHERE...Portions of south central, southwest, and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...From Noon Friday to 8 PM CDT Saturday.