Light snow mostly missing the immediate D.C. metro area, minor accumulations to the north

* Winter weather advisory for northwest Montgomery and western Loudoun counties, and locations north and west, 6 p.m. Thursday to 5 a.m. Friday *

10:35 p.m. Update: As the night wears on and radar continues to show the light snow and even flurries skirting around the DMV, it seems unlikely anyone in the immediate metro area will get more than a dusting (if that), other than northern Montgomery, northern Loudoun and northern Howard counties, where the forecast range is more like a dusting to a half-inch. The remaining light snow and flurries should quickly exit to the east after 2 a.m. or so, and we expect few (if any) problems by the morning commute, except possibly in Frederick and northern Loudoun counties where some roads may still be slick.

9:50 p.m. Update: Frederick and northern Loudoun counties are where the action is with this one. Reports of 1-2″ and some roads covered as you get into western Frederick County and northwestern Loudoun county…

Original Post

It was a cold one while waiting for our first accumulating snow of the year. That snow has already started with reports of flakes flying at times across the region since this afternoon. The most likely period for any accumulation comes later tonight. And while most spots won’t see a whole bunch, it should be enough to cause at least a few travel troubles through tomorrow morning.

Through Tonight: Scattered light snow is possible through the evening. Any of this early stuff is fairly hit-and-miss, with better odds of a widespread light snow arriving later this evening. The best chance for accumulating snow should come roughly from 8 p.m. through 3 a.m., or so. Most of this will also be light, but there could be some briefly heavier bursts. Our detailed forecast from earlier remains on target. Lows range from the mid-20s to near freezing.

About an inch of snow is most likely in locations west and north of downtown, with a dusting to an inch from the city and south. Some slick spots are likely during the snow and for a few hours after it ends. Please use extra caution while out and about!

View the current weather conditions at The Washington Post.

Tomorrow (Friday): We might see some temporary clearing behind the overnight system, but the next is on the way, so clouds are on the increase with time. I think we stay precipitation-free through the day, but there’s an outside shot of an errant snowflake by late afternoon. Highs are mostly in the mid-30s to near 40.

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

Weekend snow? We continue to keep a close eye on a storm system expected to pass offshore on Saturday. We’re currently sitting on the edge of the storm, which is always a tough place to be as small shifts one way or the other can mean nothing, or accumulating snow. Today’s model runs have brought the precipitation northwest a bit, keeping our area in play for some snowfall. It is becoming increasingly likely that our far southeast suburbs in Southern Maryland will receive accumulating snow.

As of this afternoon, St Mary’s County has been added to a Winter Storm Watch that also covers areas farther to the south and east. We’ll keep updating as needed!

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Earlier Updates

8:55 p.m. Update: Radar shows a familiar “snow hole” over the immediate D.C. metro area, not uncommon with weak little systems like these crossing west to east over the area. Looking at radar and the latest model data, our thinking is no more than around a dusting to a half-inch from approximately D.C./I-66/Route 50 and points north, except perhaps up to ~0.5-1.5″ in far northern Montgomery County, upper Loudoun County, and especially Frederick County where the ground is already well coated. Areas to the south of that D.C./I-66/Route 50 line probably won’t see more than a dusting. The light snow and flurries should exit east of the area by around 2 a.m.

7:15 p.m. Update: Flurries and some light snow picked up around the area for a bit during the 6-7 p.m. hour. But we’re now back into a lull. We’re looking at approximately 8 p.m. to 2 a.m. as our best chance to see those minor accumulations, before the light snow and flurries move away to the east.

photo Light snow mostly missing the immediate D.C. metro area, minor accumulations to the north images

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