Winter weather advisory cancelled for north and west suburbs
11 p.m. update: Precipitation is coming to an end in the western suburbs - “We can see some stars in Reston,” says one Facebook commenter -- and will end for everyone else over the next couple hours, with no snow accumulation to worry about for the greater metro area.
10:35 p.m. Update: Today is now the wettest day on record that D.C. has seen in any month from November to March - approximately 3.1” so far - and more than the average for the entire month of December.
9:55 p.m.: This storm has brought a bit of everything to the region, including heavy rain to the tune of around 3.0” and counting at Reagan National Airport, making this the wettest December, January or February (meteorological winter) day on record in D.C.; thunder in the far western suburbs; and sleet and/or snow reported to the north and west, in places like Reston, Gaithersburg and Clarksville. Not to mention those gusty winds.
The question remains, will the flood warnings and water rescues continue to be the main story for this storm, or will cold air streaming in from the north and west come fast enough to change the rain to snow before the precipitation moves out around midnight to 2 a.m. from west to east?
With the heaviest precipitation now moving away to the north and east, the odds for an extended period of snow are decreasing, since lighter precipitation will have a hard time pulling down the cold air needed to support snow (temperatures near the surface are still in the mid-30s to low 40s). In fact, the Winter Weather Advisory for the far northern and western suburbs has been cancelled except for Frederick County. Still, we can’t rule out a brief period of wet snow, especially in the north and west suburbs. Regardless, any accumulation would be light and mainly on grass.
The exception might be the far north and west suburbs (e.g., upper Montgomery County, Loudoun county and northern Fauquier counties) where there could be enough snow and cold to briefly whiten the ground, and possibly some slick spots in the morning.