* WHAT...Daily peak heat index values of 103 to 109 today and Thursday, then 100 to 105 Friday and Saturday.
* WHERE...Portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.
* WHEN...Until 7 PM CDT /8 PM EDT/ Saturday.
* IMPACTS...Record to near record hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...The Heat Advisory has been extended thru Saturday for the entire Quad State Region.