From the ABC 7 Weather team

D.C. Weather Forecast: Winter Storm Warning In Effect For Tuesday

January 20, 2014 - 11:10 PM
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Colder air will arrive tonight and set the stage for a snowy day tomorrow, as an area of low pressure is expected to form south of our area tomorrow morning. We are forecasting 5 to 8 inches of snow across the area before it ends late tomorrow night.

Overnight:
Mostly Cloudy
Lows: 20s
Wind: N 5-10 mph
Tomorrow Morning:
Cloudy and Breezy...Snow Developing
Temperatures: 30°-24°
Wind: N 10-15 mph
Tomorrow Afternoon:
Snow, Heaviest 12p-7p, Breezy
Temperatures: 20s
Wind: N 15-25+

Temperatures will fall late tonight as the leading edge of Arctic Air slowly spreads across the area. A vigorous upper level disturbance will spur the development of an area of low pressure across NC tomorrow morning. As this storm system moves northeastward towards the Atlantic Coast, snow will rapidly develop and spread across the entire area.

Snow will begin in the metro area around 9 am and become heavier during the day. The morning commute should be normal but the evening commute will likely be a mess. Temperatures will fall all day and winds will slowly increase. Temperatures could be in the upper teens by late tomorrow afternoon and will drop into the single numbers late tomorrow night….salt will not melt snow when temperatures are that cold. Additionally, winds will increase to 10 t0 20 mph in gust tomorrow night. That will complicate issues by creating sub-zero wind chills and considerable blowing and drifting snow.Total snowfall of 5 to 8 inches will be common with spots receiving up to 10 inches.

Very cold air will remain in place through Friday. In fact, temperatures will not rise to above freezing until Saturday afternoon.

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