While some of the thick morning fog has gone away, the National Weather Service is telling drivers to be careful through Wednesday afternoon.

The NWS has issued a Dense Fog Advisory for Northern Virginia and most of the Washington, D.C., area until 2 p.m. In Reston, foggy areas can get even worse around the lakes.

From the NWS:

DENSE FOG ADVISORY NOW IN EFFECT UNTIL 2 PM EST THIS AFTERNOON…

* VISIBILITIES… ONE QUARTER MILE OR LESS AT TIMES.
* IMPACTS… AREAS OF DENSE FOG WILL CAUSE SUDDEN AND GREAT REDUCTIONS IN VISIBILITY… RESULTING IN HAZARDOUS DRIVING CONDITIONS.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING… SLOW DOWN… USE YOUR LOW-BEAM HEADLIGHTS… AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.