* WHAT...Heat index values of 105 to 108 degrees expected. * WHERE...Portions of northeast North Carolina and central, east central, north central, south central, and southeast Virginia. * WHEN...From 11 AM this morning to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Overnight lows in the mid 70s will not provide much relief from hot daytime temperatures.