Spring snow leads to slick morning commute, closed schools The Washington Post's Capital Weather Gang predicted that the steadiest "boom" of snow would fall before 10 a.m., particularly north and west of the District. One to three inches of heavy, wet snow have already fallen on the region, with temperatures hovering between 32 and 34 degrees. Just before 10 a.m. EDT, the National Weather Service canceled a winter weather advisory that it declared earlier for the greater Washington metropolitan area, effective until 6 p.m. It said the heaviest snowfall has moved northeast of the area, adding that further light snow is possible at times Monday but with little accumulation expected. While the scene outside may look like a winter wonderland, the unseasonable weather was causing problems on roadways. Wet roads combined with low visibility made for a slow, potentially dangerous commute, and drivers were urged to use caution. One person was killed and three others were injured Monday morning in a crash possibly related to weather in the Glenn Dale area of Prince George's County, authorities said. The incident occurred about 8 a.m. in the 10800 block of Lanham Severn Road, just past Greenbelt Road and the Eastgate Shopping Center, said Mark Brady, a Prince George's County Fire/EMS Department spokesman. He said police and firefighters were still sorting out the details, but the crash involved at least two vehicles, and at least two people were being given CPR on the way to area hospitals. Brady said he did not know yet precisely how many vehicles were involved in the crash or how many people were injured in all. He said emergency responders believed initially that the crash was connected to weather - the most serious in a number of snow-related incidents Monday morning. He said firefighters had "been busy with crashes, wires down, slips and falls, things of that nature," especially in the northern section of Prince George's. Although it was a heavy, wet snow of the sort that brings down tree limbs and power lines, regional power companies were reporting only scattered outages at 9 a.m. Dominion Virginia Power said about 2,700 of their Northern Virginia customers were without power. Pepco said fewer than 850 customers in the District, Prince George's County and Montgomery County lacked power. Baltimore Gas and Electric, which serves Washington's outer suburbs, reported no outages at all. Early Monday morning near Dulles International Airport, a layer of snow covered the toll road, obscuring lane markers. Heavy snowfall contributed to treacherous driving conditions, limiting visibility and reducing speeds in some places to 20 mph. Travel along Interstate 66 near Falls Church was also sluggish, but conditions improved as roadways became clearer near downtown Washington.