* WHAT...Afternoon and early evening heat index values of at least 105-110 degrees.
* WHERE...Mitchell, Osborne, and Rooks Counties.
* WHEN...Until 9 PM CDT Thursday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...Overnight temperatures will drop no lower than the mid 70s across most of the area...providing only limited relief from the heat.