Extreme Heat Watch issued June 21 at 10:27PM EDT until June 23 at 9:00PM EDT by NWS Baltimore MD/Washington DC

* WHAT…For the Heat Advisory, heat index values up to 103
expected. For the Extreme Heat Watch, dangerously hot conditions
with heat index values up to 107 possible.

* WHERE…In Maryland, Washington County. In Virginia, Clarke,
Frederick VA, Page, Shenandoah, and Warren Counties. In West
Virginia, Berkeley and Jefferson Counties.

* WHEN…For the Heat Advisory, from noon to 8 PM EDT Sunday. For
the Extreme Heat Watch, from Monday morning through Monday evening.

* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.