...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 10 AM EDT THIS MORNING...

* WHAT...Visibility one quarter of a mile in dense fog.

* WHERE...In Virginia, Loudoun, Northwest Prince William, Fauquier, Rappahannock, Culpeper, Frederick, Clarke, and Warren Counties. In West Virginia, Berkeley and Jefferson Counties.

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

* IMPACTS...Hazardous driving conditions due to low visibility.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.