Extreme Heat Warning issued July 20 at 12:29AM CDT until July 24 at 7:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 110.

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

* WHEN...Until 7 PM CDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS...The long duration of this event is likely to
worsen heat related impacts, and additional extensions may be
needed beyond Thursday as forecast confidence increases.