* WHAT...Dangerously hot conditions with peak afternoon heat index values of 100 to 105 degrees expected.
* WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana.
* WHEN...Until midnight CDT /1 AM EDT/ Thursday Night.
* IMPACTS...Heat related illnesses increase during heat waves.
* ADDITIONAL DETAILS...Dangerous heat is expected to persist through Thursday. Thunderstorms may begin to bring some relief from the heat for portions of northern Illinois by Thursday afternoon or evening.