Heat Advisory issued June 23 at 1:05PM CDT until June 26 at 9:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 104.

* WHERE...In Illinois, Jersey IL, Madison IL, Monroe IL, and Saint
Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO,
Saint Louis City MO, and Saint Louis MO Counties.

* WHEN...For the Extreme Heat Warning, until 9 PM CDT this evening.
For the Heat Advisory, from 9 PM this evening to 9 PM CDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.