A frost advisory is issued for Prince William County, and the cities of Manassas and Manassas Park as one of the coldest nights of the season is setting in.
From the National Weather Service:
...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM EDT WEDNESDAY... * TEMPERATURES...32 TO 36 DEGREES OUTSIDE OF DOWNTOWN WASHINGTON AND DOWNTOWN BALTIMORE. * IMPACTS...POTENTIAL DAMAGE TO SENSITIVE PLANTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT WIDESPREAD FROST IS EXPECTED. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED.