Dense Fog Advisory issued May 20 at 5:04AM EDT until May 20 at 10:00AM EDT by NWS Baltimore MD/Washington DC

* WHAT...
Visibility one quarter mile or less in dense fog.

* WHERE...
Portions of western Maryland, the Shenandoah Valley and central piedmont of Virginia, and eastern West Virginia.

* WHEN...
Until 10 AM EDT this morning.

* IMPACTS...
Low visibility could make driving conditions hazardous.

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