Heat Advisory

* WHAT...Heat index values up to 103.

* WHERE...Portions of southwest Iowa.

* WHEN...From 1 PM this afternoon to 7 PM CDT Thursday.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* ADDITIONAL DETAILS...While heat index values may not reach 105 degrees each day, the combination of the longevity of the heat and little or limited relief during the overnight periods with warm lows have prompted the multi-day Heat Advisory.