(Updated 10:04 a.m. with road closures).

The National Weather Service has issued a Winter Storm Warning for our area until 1 p.m. on Tuesday. The Winter Weather Advisory is no longer in effect.

The forecast now calls for 4 to 6 inches of snow, with the heaviest snow falling through 11 a.m. Temperatures will remain in the low 20s.

The NWS says snow accumulating on all surfaces well below freezing and visibility below half mile will continue to make for very hazardous travel conditions.

Weather forecasters had predicted a dusting to 2 inches of snow for Northern Virginia early Tuesday. However, the suburbs south of Washington, D.C., got more snow than predicted. About 3-4 inches had fallen in Reston as of 9:40 a.m. Tuesday.

Drivers reported massive delays and some road closures Tuesday morning. Fairfax County Public Schools did not delay or close, which concerned many parents and students. #CLOSEFCPS was trending on Twitter Tuesday morning.

Several roads in the Reston area were closed as of 10 a.m., including Wiehle Avenue at Fairway Drive, Hunter Mill Road at Sunrise Valley Drive and South Lakes Drive at Colts Neck Road. See the entire list of Fairfax County Road closures on Fairfax County’s blog.