* WHAT...For the Heat Advisory, heat index values up to 104 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 108 possible.
* WHERE...In Maryland, Washington County. In Virginia, Clarke, Frederick, Page, Shenandoah, and Warren Counties. In West Virginia, Berkeley, Jefferson, and Morgan Counties.
* WHEN...For the Heat Advisory, from 11 AM to 8 PM EDT Wednesday. For the Extreme Heat Watch, from Thursday morning through Friday evening.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.