Arlington County and other D.C. area jurisdictions are under a Dense Fog Advisory this morning.
From the National Weather Service:
… DENSE FOG ADVISORY NOW IN EFFECT UNTIL NOON EDT TODAY… * VISIBILITIES… ONE QUARTER MILE OR LESS. * IMPACTS… AREAS OF DENSE FOG WILL CAUSE SUDDEN REDUCTIONS IN VISIBILITY AND RAPIDLY CHANGING 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 HEADLIGHTS, AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU. &&
The fog is causing some delays at Reagan National Airport, the airport tweeted this morning.
Some fog this am causing minor delays. Check with your airline for your flight status. Happy Monday! pic.twitter.com/IOwGZBOY20
— Reagan Airport (@Reagan_Airport) March 27, 2017