* WHAT...Dangerously hot conditions with heat index values exceeding 100 degrees multiple days, with several locations seeing upwards to 105 to 110.
* WHERE...Portions of northwest and west central Illinois, east central and southeast Iowa, and northeast Missouri.
* WHEN...From 1 PM Sunday to 9 PM CDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.
* ADDITIONAL DETAILS...There is the possibility that excessive heat will last for much of next week. Thunderstorms and associated cloud debris may interrupt the excessive heat at times late in the week.