* WHAT...Heat index values up to 104 expected, with limited relief overnight.
* WHERE...In Pennsylvania, Higher Elevations of Fayette, Higher Elevations of Westmoreland, and Higher Elevations of Indiana Counties. In West Virginia, Preston and Ridges of Eastern Monongalia and Northwestern Preston Counties.
* WHEN...Until 10 PM EDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.