NWS / NOAA weather: Extreme Heat Warning issued July 4 at 9:07AM EDT until July 4 at 8:00PM EDT by NWS Baltimore MD/Washington DC

* WHAT...Dangerously hot conditions with heat index values up to 105
to 109 expected.

* WHERE...Portions of north central Maryland, northwest Virginia,
and eastern West Virginia.

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS...Prolonged excessive heat may impact power,
water, and transportation systems. Heat index values of 95 to 100
are possible again Sunday afternoon.

Source: NWS / NOAA weather.