D.C. area forecast: Afternoon/evening wet snow or mix; calm Christmas, then stormy

EXPRESS FORECAST

Today: Mostly sunny. 45-50. | Tonight: Increasing clouds. 29-35. | Tomorrow: Rain developing midday. 37-44. | Get Express Forecast9 by E-mail


A daily assessment of the potential for *accumulating* snow for the next week on a 0-10 scale. More info


FORECAST IN DETAIL


Today (Monday): Most spots start the day sub-freezing but sunshine helps us pass 40 by noon. Afternoon highs range from 45-50. Winds - from the northwest at 5-10 mph - are much less gusty than Sunday. Confidence: High

Tonight: Clouds slowly increase overnight, and lower and thicken by morning. We should remain precipitaton-free through sunrise, with lows ranging from 29-35 (suburbs-city). Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend...

Tomorrow (Tuesday): The next storm system moves in producing rain showers - starting mid-morning to early afternoon. Well west and northwest of the District (mainly towards I-81), precipitation may begin briefly as (mainly) non-accumulating wet snow and/or sleet before changing to rain. Rain may become moderate to heavy towards evening. Highs range from the upper 30s in the colder suburbs to 40-45 elsewhere. Confidence: Medium-High

Tomorrow night: Rain is likely and may be moderate-to-heavy before 10 p.m. After midnight, rain decreases in coverage and intensity and temperatures should remain steady near 40 as winds come in out of the southwest. Total rain should average between 0.5-1 inch, with highest amounts probably west of the District. Confidence: Medium-High

A LOOK AHEAD

Wednesday is the mildest day of the week as we get a brief push of warm air (from downsloping westerly winds) before cold air rushes in behind the cold front moving through. Highs push well into the 50s and someone could even touch 60 with enough sunshine. Skies are variably cloudy and I can’t rule out a brief afternoon shower. It’s mostly cloudy and cooler Wednesday night, with lows 33-39 (suburbs-city). A rain or snow shower is possible (20-30 percent chance) towards morning Confidence: Medium

Thursday is mostly cloudy and chilly with a 40 percent chance of rain and/or snow showers as a disturbance swings through the region. With highs 40-44, I’m not concerned about snow accumulation. Partial clearing and seasonably cold Thursday night, with lows 29-34 (suburbs-city). Confidence: Medium

The pattern is definitely a very cold one to start March, Friday through the weekend. The jet stream takes a giant dip allowing Arctic air to dive all the way into Florida. For us, that means highs near 40, and lows 18-26 (suburbs-city). Sky conditions are generally partly cloudy. A little storminess may try to develop off the coast over the weekend, but current indications are too far out to sea to impact us. We’ll keep an eye on it. Confidence: Medium

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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