* WHAT...Dangerously hot conditions with heat index values up to 110 expected.
* WHERE...Portions of northwest, western, central and southern Iowa.
* 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...Excessive heat will persist through much of next week, potentially including the 4th of July weekend.