UPDATE 7:47 p.m: Fairfax County is also under a severe thunderstorm warning through 8:30 p.m.
"This is a dangerous line of storms. If you are in its path, move indoors to a sturdy building and stay away from windows. When it is safe to do so, report severe weather to local law enforcement or to the National Weather Service," the alert says.
"This line of storms has a history of producing wind damage in North-central Virginia. Seek shelter inside a sturdy structure and stay away from windows."
UPDATE 6:40 p.m.: The National Weather Service has issued a Tornado Watch for Fairfax County from 6:30 p.m. until Thursday at 2 a.m. The county is also under a wind advisory until Thursday at 6 a.m.
The National Weather Service warns that a line of heavy rain and thunderstorms this afternoon could mean flooding for Vienna and other areas of Northern Virginia.
NWS issued a flash flood watch from 3 p.m. until late Wednesday night for the region, including Vienna and Falls Church, and Fairfax, Loudoun, Arlington and Alexandria Counties.
What forecasters are calling "a strong cold front" is heading toward Northern Virginia, and the area could see 1-2 inches of rain — possibly with thunderstorms — with heavy rain starting to fall around 9 p.m. Wednesday, said Calvin Meadows, a meteorological technician at the National Weather Service office in Sterling.
The area could see wind gusts up to 40 MPH, according to NWS.
Two areas that almost always see flooding in Vienna: Lawyers and Hunter Mill roads. The intersection of Center Street and Maple Avenue has also caused issues in the past.
The watch comes on the heels of some wacky weather: freezing rain Monday that delayed or closed some Northern Virginia schools, and highs Tuesday that reached nearly 70 degrees.
Though highs will near 70 again Wednesday, the low temperature Wednesday night is expected to plunge to 40 degrees. Thursday's high temperature will struggle to reach 50 degrees.