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.

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