* WHAT...High temperatures in the mid to upper 90s, with stifling humidity creating Peak Heat Index values up to around 105 degrees.
* WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.
* WHEN...From 11 AM CDT /noon EDT/ to 8 PM CDT /9 PM EDT/ Tuesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.