UPDATE 3/5 3:10 p.m.:
Prince William County, Manassas, and Manassas Park are now under a Winter Storm WARNING, which goes into effect at midnight and lasts through 3 a.m Thursday.
The warning means "severe winter weather conditions are expected or occurring," the National Weather Service said Tuesday afternoon. "Significant amounts of snow are forecast that will make travel dangerous."
All of Northern Virginia now falls under the warning.
The National Weather Service predicts rain before 8 p.m. Tuesday, then rain and snow with three to five inches of snow possible on the western end of the county, and two to four inches on the eastern end overnight.
For Wednesday, the western end of Prince William County will see all snow, with another four to eight inches possible, according to the National Weather Service forecast.
The eastern end of the county is expected to see snow Wednesday until about 10 a.m., then rain and snow from around 10 a.m. to 1 p.m., the National Weather Service said. It is expected to turn back to all snow after 1 p.m. with three to five additional inches possible during the day.
Wednesday night will bring more snow and there's a chance of snow Thursday morning as well, the National Weather Service predicts.
"Heavy wet snow and gusty winds could lead to power outages Wednesday afternoon and night," the National Weather Service said.
UPDATE 3/5 12:45 p.m.:
Thousands of salt trucks and plows will be on Northern Virginia roads come Wednesday morning.
The Virginia Department of Transportation said by 4 a.m., over 4,000 trucks and plows will be treating and clearing the 17,679 miles of roads its responsible for in Prince William, Loudoun, Fairfax, and Arlington counties.
VDOT said because it splits Northern Virginia roads into two programs, one for "high volume roads" and one for subdivisions, crews will be working simultaneously on both.
"Major routes are treated with chemicals and plowed once two inches have fallen. In subdivisions and other low volume roads hills and other trouble spots are treated with sand and plowed when two inches have accumulated," VDOT said in a press release.
UPDATE 3/5 11:45 a.m.:
The City of Manassas Park issued a Snow Emergency which will be in effect from 6 p.m. Tuesday until 6 a.m. Thursday, though it can be extended.
The emergency restricts all parking on designated Snow Emergency routes.
Roadways in Manassas Park impacted by the Snow Emergency include: Manassas Drive from Baker Street to Golf Court, Denver Drive from Manassas Drive to Rugby Road, Digital Drive from Manassas Drive to West Carondolet Drive, all of Matthew Drive, all of West Carondolet Drive, Polk Drive from Manassas Drive to Old Centreville Road.
UPDATE 3/5, 11 a.m.:
The City of Manassas said a Snow Emergency will go into effect at 8 p.m. Tuesday night, "This means that cars parked along designated snow emergency routes are subject to towing and fines."
The following roadways in Manassas are considered Snow Emergency routes: Dumfries Road/Route 234, Hastings Drive, Godwin Drive, Liberia Avenue, Richmond Avenue, Fairview Avenue, Grant Avenue, Wellington Road, Ashton Avenue, Cockrell Road, Nokesville Road/Route 28, Center Street, Prescott Avenue, Sudley Road/Route 234, Church Street, Zebedee Street, Centreville Road/Route 28, Mathis Avenue, Portner Avenue, and Euclid Avenue.
While it’s officially meteorological spring, this storm has the potential to dump four or more inches of snow in Northern Virginia, and possibly more to the north and west. But strong March sun angles and relatively warm daytime temperatures may mean more rain than snow.
March snowstorms are pretty rare in the D.C. area, but not unheard of.
The Ash Wednesday Storm on March 5, 1962 hit during the “spring tide” full moon, causing massive coastal flooding and dumping up to two feet of snow in western Virginia, according to NWS.
On March 29, 1942, what’s known as the Palm Sunday Snowstorm brought record snow to the D.C. area, with 22 inches falling in Baltimore and 12 in Washington.
- GALLERY: Photos from January 24, 2013 snow
And many longtime residents may remember of “Superstorm” of March 13, 1993, which killed more than 200 people and caused massive flooding from Alabama to New England. In the Washington area, D.C. saw about a foot of snow and more in Loudoun counties and areas west of the city.