A dense fog advisory is in effect until 4 p.m. today (Tuesday).
Visibility will be down to one quarter of a mile in much of the area, according to the National Weather Service.
Here’s more from the alert:
* WHERE…The District of Columbia, portions of central, northern and southern Maryland, central, northern and northwest Virginia and the eastern panhandle of West Virginia.
* WHEN…Until 4 PM EST this afternoon.
* IMPACTS…Hazardous driving conditions due to low visibility.
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.