* WHAT...Heat index values up to 102.
* WHERE...A portion of central Pennsylvania.
* WHEN...Until 8 PM EDT Wednesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...Smoke aloft from wildfires in central Canada may help to lower the temperatures a degree or two from current expectations for Wednesday. If it does, that would help to lessen concerns for heat illnesses.