* WHAT...Heat index values up to 110.
* WHERE...Portions of southeast Arkansas, northeast Louisiana, much of Mississippi.
* WHEN...Until 7 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat related illnesses.
* ADDITIONAL DETAILS...Temperatures at night will not bring much relief as they struggle to fall below 80 in some cases. The threat for dangerous heat will continue into early next week.