The National Weather Service has issued a Dense Fog Advisory for Falls Church. The advisory is in effect until 9 a.m. Wednesday, although the weather service says the area could remain foggy until 11 a.m.
Visibility is reduced to one-quarter of a mile or less. If you're driving Wednesday morning, the NWS warns that "areas of dense fog will cause sudden reductions in visibility and rapidly changing conditions."
Drivers are cautioned to slow down, use low beam headlights and leave plenty of distance ahead of you.