PM Update: Winter weather advisory western areas tonight for wintry mix

10:00 p.m. update: The winter weather advisory has been extended east a bit, into Montgomery and Howard counties for a mix of snow, sleet and freezing rain overnight, with snow/sleet accumulations up to 1 inch possible. Timeframe is 4 a.m. to 10 a.m.

9:30 p.m. update: Our forecast below is on track...still think we’ll have a period of mixed precipitation overnight changing to mostly rain before dawn, with any iciness *well* west of the District, mainly in Frederick, Loudoun, and perhaps northern Montgomery county.

Schoolcast - north and west of Fairfax county:

Schoolcast - everywhere else:

From 3:55 p.m.: A wintry mix of rain, freezing rain (colder suburbs), sleet and snow develops late tonight from the beginnings of a massive winter storm. The slop of precipitation transitions to rain Friday. Accumulating frozen precipitation is likely limited to the morning hours well west and north of the beltway, where a winter weather advisory has been posted. Precipitation moves out Friday afternoon, as winds begin to rip.

Through Tonight: It’s cloudy through the evening, with a mix of rain, sleet and snow developing mainly after midnight. Accumulation, if any, in the immediate area should mainly be on grassy areas, with lows 33-36. In our colder suburbs - Loudoun, northern Fauquier, northern Montgomery and Frederick counties - a period of accumulating freezing rain, sleet and snow is possible, with amounts up to an inch or so, with lows 30-33.

Friday: A sloppy mix is likely in the morning, gradually transitioning to all rain from southeast to northwest (by 10 a.m. to noon). Precipitation tapers off in the afternoon, as winds slowly pick up. Highs range from 40-45.

See David Streit’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter. For related traffic news, check out Dr. Gridlock.

Some more winter storm/blizzard notes: Several points: 1) Winds will really pick up in D.C. Friday night as the storm bombs out off the coast. Gusts near 40 mph or a bit higher are possible. 2) It’s not out of the question D.C.’s northern suburbs get into the south end of storm’s wrap around snow late Friday night - especially up towards Baltimore. We’ll watch that tomorrow. 3) Blizzard warnings have been hoisted for Boston, New York City, and all of Connecticut. 4) Link: A nice round-up of what TV stations are forecasting for New England 5) The latest mean snowfall from the Short Range Ensemble Forecast system is 30 inches for Boston, wow.

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
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