* WHAT...Heat index values up to 105 expected.
* WHERE...In Iowa, Fremont, Mills, Montgomery, Page, and Pottawattamie Counties. In Nebraska, Douglas and Sarpy Counties.
* WHEN...From 1 PM to 9 PM CDT Wednesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...Heat's impacts can compound when temperatures don't slip below 75 degrees overnight as has been the case all week.