Update at 10:00 p.m. — Traffic started moving again on I-66 for a few minutes, but is now back at a standstill.
Update at 10:00 p.m. — There are now more than 13,400 Dominion customers without power in Arlington.
Heavy, wet snow is continuing to fall in the area, knocking down trees and power lines and grinding traffic to a halt.
As a result of road conditions, Arlington Transit has announced that it will be discontinuing ART bus service at 9:00 p.m. Meanwhile, Metrobus service will end at 9:30 p.m.
Traffic on westbound I-66 has been at a standstill from Rosslyn to Spout Run for at least one three hours. Hundreds of motorists are stranded in the snow. Many have turned off their car to save gas.
More than 10,000 Dominion customers are without power in Arlington. On Twitter, residents of nearly every Arlington zip code have reported flickering lights.
Dozens of reports of downed trees and power lines are coming in. Many are reporting transformers and trees on fire. One tree in the area of Marymount University fell on a house, but no injuries were reported.
Arlington County reports that it has 45 plows out clearing roads. Crews will be working throughout the night, the county says.