* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values from 105 to 112 degrees can be expected. For the Heat Advisory, heat index values will reach from 102 to 107 degrees.
* WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.
* WHEN...For the Extreme Heat Warning, until 8 PM CDT /9 PM EDT/ this evening. For the Heat Advisory, from 8 PM CDT /9 PM EDT/ this evening to 8 PM CDT /9 PM EDT/ Saturday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.