* WHAT...Heat index values up to 104 expected.
* WHERE...Cambria, Cameron, Clearfield, Elk, Northern Centre, Northern Clinton, Northern Lycoming, Potter, Sullivan, and Tioga Counties.
* WHEN...From noon Wednesday to 8 PM EDT Thursday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...High temperatures will be well into the 90s. Heat index values will be even higher. While temperatures will remain hot on Friday, they should be a couple of degrees lower.