* WHAT. Heat index values 95 to 100. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values 95 to 100. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Although afternoon thunderstorms have provided cooling relief across many parts of the region, a return to hot and humid conditions will again return on Tuesday and continue throughout the week.

* WHAT. Maximum heat index values around 100. * WHERE. A portion of central Pennsylvania. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause an increase in heat-related illnesses. * ADDITIONAL DETAILS. The risk of heat-related impacts is expected to reach its highest level this afternoon. The early season heat persisting over multiple days combined with light winds, limited cloud cover, and very warm nights will exacerbate heat stress.