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Updates: Gusty snow squalls possible midday, wind chill advisory tonight




A group from the Trinity Presbyterian School of Montgomery, Ala., Tours the Lincoln Memorial at Tuesday as a moderate to heavy snow moves over the Washington region. (Photo by Jonathan Newton / The Washington Post)

* Wind advisory 9 a.m. to 6 p.m. | Wind chill advisory tonight | School closings and delays | Snow totals from National Weather Service *

11:25 am.m. – Snow squall warning for Loudoun and Frederick counties

The snow squall line is pushing into the far western part of the Washington region. The zone included in the warning is shown below:

It says whiteout conditions with heavy snow and blowing snow are possible. Winds may gusts over 30 mph. Interstate 70, Interstate 81 and Interstate 15. For the time being, the Weather Service cautions.

10:40 am.m. – Watch for midday snow squalls with strong winds

Radar and short-range models show the potential for snow in the region around the lunch hour. These snow squalls could be sharply reduced in some slick spots. In addition, almost like thunderstorms, over 30 mph.


Simulated radar of snow squall moving through midday from HRRR model.

Already, a snow squall warning of the Wester Frederick, Md. through 11:15 am, including Martinsburg and Hagerstown.

The Weather Service describes a "dangerous" snow squall that would lead to poor visibility – with wind gusts to 30 mph. It warned: "For those driving on Interstate 68, and other high-speed highways in the area, this is especially dangerous."

7:30 am.m. – Use caution walking and driving on this morning

Please walk and drive with this morning. Numerical icy spots have been reported by D.C. Being careful driving on ramps and overpasses, and walking on sidewalks and driveways. Winds are currently in the 20s. but they’ll turn gusty by afternoon. Best chance of snow showers looks to be around 11 a.m. to 3 p.m. with briefly reduced visibility and slick roads possible.

Detailed forecast from 5 a.m.

TODAY'S DAILY DIGIT

The somewhat subjective rating of the day, on a scale of 0 to 10.

2/10: Highs in the upper 20s to mid-30s not so bad, right? But gusty afternoon winds add a biting chill, with maybe a few snow showers to set the mood.

EXPRESS FORECAST

Today: Cold and windy, a few snow showers? Highs: Upper 20s to mid-30s.

Tonight: Bitter cold. Lows: Near 0 to near zero (wind chills)

Tomorrow: Mostly sunny, frigid. Highs: Low-to-20s (wind chills: sub-zero to teens).

View the current weather at The Washington Post headquarters.

FORECAST IN DETAIL

Well this is fun, isn't it? Today isn't crazy cold-wise, but features a biting chill as winds turn. The worst of this cold blast arrives tonight into tomorrow with a single-digit lows and sub-zero wind chills. Friday trends slightly warmer but with another chance of light snow.

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Today (Wednesday): The truly bitter blast isn't here quite yet. But it is still the cold day of the 20s – and afternoon highs in the upper 20s to mid-30s. Winds crank up afternoon, gusting to near the west-southwest, with wind chills in the teens to low 20s. Partly sunny morning skies turn cloudy late morning into the afternoon, when a few snow showers could put down a quick coating in spots. Confidence: Medium-High

Tonight: Winds should be from the northwest, evening breezy as skies turn mostly clear. The bitter cold and dry air in the evening is like a rock through the 20s and teens. Most spots should be lows in the single digits, maybe all the way down to the bottom of our coldest, and holding up near 10 degrees downtown. Winds diminish overnight, but still just enough of a breeze. Confidence: High

Follow us on Facebook, Twitter, and Instagram for the latest updates. For related traffic news, check out Gridlock. Keep reading for the forecast through the weekend …

Tomorrow (Thursday): We've got plenty of school delays again, and maybe some cancellations, as well. A relatively light breeze, about 10 mph from the west, is enough to keep winds down in the morning. Low-to-mid 20s is the best we can do afternoon highs, with the lingering breeze keeping in the teens and single digits. Confidence: Medium-High

Tomorrow night: Increasing clouds should prevent us from getting as cold as tonight. But we're still talking very chilly lows ranging from the 20th to the 20th. Confidence: Medium-High

A LOOK AHEAD

Friday skies are mostly cloudy as a bit of energy. If there 's any accumulation, it' s supposed to be more than a dozen. Anything that falls would stick, though, with highs in the mid-20s to low 30s. Partly cloudy Friday night with lows in the mid-teens to low 20s. Confidence: Low-Medium

High pressure dominates Saturday into Saturday night with partly clear skies and light winds. Saturday highs should reach in the mid-30s to low 40s, before Saturday night lows fall back into the 20s. Sunday should continue to be in the 40s to near 50s. Confidence: Medium-High

SNOW POTENTIAL INDEX

A daily scale of the next week is a 0-10 scale.

3/10 (): A few snow showers today, and maybe a bit of light snow Friday. At the moment, no seems to have much more than a coating potential.


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