If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST FRIDAY...
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Portions of central, north central, northeast,
northern and western Maryland, The District of Columbia,
northern Virginia and eastern and panhandle West Virginia.
* WHEN...Until 1 AM EST Friday.
* IMPACTS...Hazardous driving conditions due to low visibility.