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Posted at 05:00 AM ET, 02/07/2013

D.C. area forecast: Clouds today, possible wintry mix tonight, rain Friday

EXPRESS FORECAST

Today: Increasing clouds. 38-42. | Tonight: Wintry mix after midnight changing to rain. 31-35. | Tomorrow: Light rain ending midday. 42-46. | Get Express Forecast by E-mail

TODAY'S DAILY DIGIT

A somewhat subjective rating of the day’s weather, on a scale of 0 to 10


Nothing remarkable for a winter day but would like a little more sun please. Get the Digit on Twitter| Discuss on Facebook

SNOW POTENTIAL INDEX

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


SPI: 3/10 (↓) -Major winter storm in making Fri, but for D.C. a few sloppy flakes then rain. For a 10++, head to Boston. Get the SPI on Twitter | Discuss on Facebook

FORECAST IN DETAIL


We get to witness the birth of a major storm late tonight that will hammer eastern New England. We deal with more mild effects.

Cold air tries desperately to get into the area as the storm develops but a clipper up in the Great Lakes cuts it off at the pass. Still, I would not be surprised to see a period of wet snow or sleet at the onset around midnight. Most areas should switch over to rain before sunrise. The weekend starts out windy and colder but warms up nicely by Sunday.

Today (Thursday): There should still be some early morning sun but a breeze from the east signals Atlantic moisture arriving. The result should be mostly cloudy skies by midday. Colder air is seeping into the area from the north and with the clouds keeps highs in the upper 30s to lower 40s. Confidence: Medium-High

Tonight: The clouds thicken up in the evening and a steady breeze from the east continues. The onset of precipitation (60-70% chance) is still not certain but likely comes around midnight. The earlier it arrives the better chance of a period of snow and/or sleet before all rain from south to north across the area. All but far northern suburbs should have rain dawn. Little or no snow accumulation is expected except *perhaps* enough to whiten grassy areas from western Loudoun county and to the north. Confidence: Medium

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

Tomorrow (Friday): This is a gray day with light rains lingering through mid-morning (60% chance). At that point, winds shift to come from the northwest and pick up to 10-20 mph by afternoon. Highs should only be in the low-to-mid 40s. Confidence: Medium

Tomorrow night: Clouds may hide the stars but what is more certain is winds pick up strongly in the wake of the rapidly strengthening winter storm headed for the Boston area. Northwest winds howl at 15-25 mph with gusts over 35 mph. Lows drop to the upper 20s to low 30s but feel as cold as the teens late at night. Confidence: Medium

A LOOK AHEAD

Saturday starts out with brisk winds from the north but they do gradually weaken as the day progresses. Bright sunshine is on tap but warmth is not, as colder air behind the New England storm piles in. Highs are stuck in the upper 30s to lower 40s. As winds diminish in the evening temperatures slip below freezing and end up in the upper teens suburbs to mid-20s downtown. Confidence: Medium

Despite the cold start, Sunday recovers nicely. Highs should jump to the mid-to-upper 40s with low 50s possible in a few spots under mainly sunny skies and calm winds. Increasing clouds and breezes from the south ensure that most if not all areas remain above freezing, in the mid-to-upper 30s. Confidence: Medium

Monday is likely to start with some light rain showers (60% chance) but they could be out of the way by afternoon and allow highs to reach the low-to-mid 50s. For anyone with binoculars and a clear view to the setting sun check out a rare glimpse of Mercury atop the sliver of a crescent moon about 30 minutes after sunset. Confidence: Low-Medium

By  |  05:00 AM ET, 02/07/2013

Categories:  Forecasts

 
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