* WHAT...Dangerously hot conditions with heat index exceeding 100 degrees multiple days.

* WHERE...Portions of north central, northwest, and west central Illinois, east central, northeast, and southeast Iowa, and northeast Missouri.

* WHEN...From Sunday afternoon through Tuesday evening.

* 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. close