Dense Fog Advisory

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THURSDAY... THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A DENSE FOG ADVISORY...WHICH IS IN EFFECT UNTIL 9 AM EST THURSDAY FOR AREAS ALONG AND EAST OF THE BLUE RIDGE...AND THE SHENANDOAH VALLEY. MOSTLY CLEAR SKIES HAVE COMBINED WITH CALM WINDS AND ABUNDANT MOISTURE AT THE SURFACE TO PROMOTE DENSE FOG DEVELOPMENT THIS EVENING ACROSS THE REGION. OVERNIGHT...THIS FOG WILL CONTINUE TO BECOME MORE WIDESPREAD...WITH A PROLONGED PERIOD OF DENSE FOG EXPECTED ACROSS MUCH OF MARYLAND...NORTHERN VIRGINIA...AND THE EASTERN WEST VIRGINIA PANHANDLE. AFTER SUNRISE...THE FOG SHOULD BEGIN TO DISSIPATE.