* Winter weather advisory along and west of Interstate 95 from 7 p.m. Sunday to 10 a.m. Monday | School delays *

Key points

  • After a coating of snow, most locations have transitioned to sleet and freezing rain. (In northern Maryland, snow may continue as the dominant precipitation type until the predawn hours.) This wintry mix will make for  slick travel overnight, especially on untreated roads and sidewalks. Pedestrians and motorists should use caution.
  • For Monday morning’s commute, mixed precipitation and slick roads are most likely north and west of downtown Washington. From downtown to the south and east, temperatures rising above freezing should allow for mostly plain rain and wet roads.

Updates

11:35 p.m. - Wintry mix falling in most areas. Expect slick spots overnight.

The snow-mix line has lifted all the way north to Columbia, Md. now (and should continue slowly migrating north). Snow is now mostly confined along and north of Interstate 70, with a wintry mix to the south.

For much of the Washington area, the snow part of this event is over and we’ll now just have sleet and freezing rain for the remainder of the night. Some of our milder spots, mainly from downtown to the southeast, may see precipitation change to plain rain.


NAM forecast radar through 10 a.m. Monday. Green is rain. Pink is wintry mix. Blue is snow. (PivotalWeather.com/PivotalWeather.com)

Through the night and into the morning commute, we expect the most widespread slippery conditions in our colder areas west and northwest of the Beltway but slick spots are still likely in the immediate metro area considering temperatures right around freezing and the concoction of frozen precipitation. Our greatest concern is on sidewalks, driveways, parking lots and neighborhood roads.

This is our last update this evening. Scroll down for the forecast through tomorrow. Check back at 5 a.m. Monday for our next detailed forecast update.

10:55 p.m. - Snow has changed to sleet and freezing rain from District south

The snow fell heavily for a time in the immediate metro region, but snow-mix line surged northward (faster than projected by models) and many areas from the Beltway south have now changed to sleet and freezing rain. That means the snow accumulation may be mostly over, but we’ll have to deal with a slick layer of sleet/freezing rain on top of the slushy coating of snow which fell. Side roads and sidewalks will be the main areas of concern.

10:15 p.m. - Snow coming down hard and fast, some slick spots developing

Once it started snowing in the past hour, the intensity picked up quickly. This has allowed temperatures to quickly drop to near freezing and for snow to coat grassy areas and even untreated sidewalks and neighborhood roads. Main roads, so far, are holding up okay. Use caution if you’re traveling.


Temperatures at 10:15 p.m. (Weather Underground)

Short-range models and radar suggest snow should fall steadily for at least another two to three hours, but probably not as heavily as that opening burst. Even so, some areas may see totals exceed an inch, entering boom territory. At the same time, we do need to watch an area of sleet and rain (except freezing rain where temperatures are below 32) to the south which should lift north with time and limit how much snow can accumulate during the overnight period - except into northern Maryland.

Here are some images...

9:30 p.m. - Snow quickly overspreading immediate metro region

In the last 15 to 20 minutes, we’ve received a flurry of reports of snow developing from the District westward. And, it does not take long for the snow to start falling a pretty fast clip.

We’ve received reports of snow falling in Arlington, Burke, Alexandria, Vienna, Fairfax, parts of Montgomery County and even into Southern Maryland.

In the next hour, snow should begin to fall even in our eastern areas.

The snow will first stick to mulch, car tops, and grassy areas and then, fairly quickly may begin to coat untreated paved surfaces. So use caution walking and driving.

8:25 p.m. - Snow developing in our far western areas

Radar shows snow developing in the western part of our region from around Frederick and Leesburg and westward through the Interstate 81 corridor. We’ve received reports of light snow in Winchester, as well as Round Hill and Purcellville in western Loudoun County.

This snow should start to spread east into Montgomery, eastern Loudoun, and Fairfax counties over the next hour.

Detailed forecast from 6:30 p.m.

Things are going to get messy over the next 36 to 48 hours. A battle zone between warm and cold air will essentially bisect the D.C. area, just as several rounds of precipitation move in. That means we are in for the whole gamut: snow, sleet, freezing rain and just plain rain. Expect more of the former in the overnight hours Sunday, which, despite the lack of much accumulation, will still create slippery conditions on roadways come Monday morning.

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Through Sunday night: Remaining overcast for the next few hours, before light precipitation starts to break out between 8 and 11 p.m. Expecting light snow at the onset of precipitation, despite marginal temperatures in the 32- to 36-degree range. Snow should switch over to a sleet/freezing rain/rain mix sometime after midnight, with locations from D.C. and toward the south/southeast experiencing the changeover first, and locations to the north/northwest hanging onto the light snow the longest.


(Capital Weather Gang) (CWG/CWG)

Snow/sleet/ice accumulations should be mostly limited to grassy surface around D.C., as road temperatures should remain mostly high enough to avoid substantial buildup. In our colder areas, untreated roads and sidewalks have the best of becoming slick and icy and both pedestrians and motorists should use caution. Lows will end up on either side of 32 degrees depending on location, with light winds from the southeast.


(Capital Weather Gang)

View the current weather at The Washington Post.

Tomorrow (Monday): Slippery and icy spots in the morning, especially north and west of D.C. Light rain/freezing rain persists through the early morning, compounding commuting issues. We should see a brief lull in precipitation by the late morning before more precipitation moves in by the afternoon in the form of mostly rain. High temperatures ranging from the mid- to upper 30s.

Precipitation is expected to resume Monday night, potentially changing back to a sleet/freezing rain mix at some point in our colder areas, probably resulting in more commute issues for Tuesday morning. Lows are right around 32 degrees.

See Brian Jackson’s forecast through 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 Gridlock.

Hail at Pebble Beach: Play in the Pro-Am tournament at the legendarily pristine links at Pebble Beach was halted for over an hour on Sunday after a short bout of hail. A small but intense storm cell passed right over the golf course with rain, thunder and hail. After it passed, it looked like a winter wonderland.

The unusual weather was part of a large and powerful storm system cycling down the Pacific Coast over the weekend. Among some of the other highlights from this storm were the feet of snow it dumped in the Sierras and of course Seattle’s version of Snowmaggedon.

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