Extreme Heat Watch issued June 20 at 2:03AM CDT until June 24 at 9:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 109
possible.

* 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...From Saturday afternoon through Tuesday evening.

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