Active AlertsWheaton, MD

What: Visibility one quarter mile or less in dense fog.
Where: Portions of DC, central, north central, northern, and southern Maryland, central, northern, northwest, and western Virginia, and panhandle West Virginia.
When: Until 10 AM EST this morning.
Impacts: Low visibility could make driving conditions hazardous.

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