* WHAT...Very cold wind chills as low as 5 to 9 below expected.

* WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.

* WHEN...From 1 AM CST /2 AM EST/ to 3 PM CST /4 PM EST/ Tuesday.

* IMPACTS...Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures.