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

* WHAT...
Heat index values up to 104 expected.

* WHERE...
In Maryland, Central and Eastern Allegany County. In Virginia, Augusta, Eastern Highland, and Rockingham Counties. In West Virginia, Eastern Grant, Eastern Mineral, and Eastern Pendleton Counties.

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

* IMPACTS...
Hot temperatures and high humidity may cause heat illnesses.

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

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