PM Update: Rain and snow showers possible tonight; cool and dry Wednesday

December 17, 2013

Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

This morning’s clipper dusted parts of northern Maryland, but left much of the D.C. metro region with merely overcast skies. A second clipper zips through the region tonight and may produce some rain and snow showers, mostly in on our southern suburbs. By the early morning hours, the entire region begins to clear out. The balance of Wednesday is sunny, but chilly.

Through Tonight: Precipitation streaks into southern part of the region this evening and *may* expand into the rest of the metro area by 7 or 8 p.m.  But there’s likely to be a short northern cutoff- meaning places around the District and north may not get much if anything.  The overall chances of precipitation are 30 percent in Frederick and Howard counties, 40 percent in Loudoun, Montgomery and  Anne Arundel counties, 50 percent in Fairfax and Prince George’s counties and the District, 60 percent in Fauquier, Prince William, Charles and Calvert counties, and 70 percent in Stafford and St. Mary’s counties.

The precipitation type is another challenge.  Right now, it looks like it probably begins as rain showers or a rain/snow mix, but may change to mostly snow after 10 p.m. or so in the immediate D.C. area (it probably remains mostly rain in southern  Maryland) – assuming the precipitation gets here.  Temperatures remain above freezing through around midnight, so little sticking on roads is expected.  Somebody could see a coating, but mostly on grassy areas.

Any precipitations tapers off between midnight and 2 a.m. from west to east. Then skies gradually clear.  Lows range from the upper 20s in the colder suburbs to 32 or 33 in the District and southern Maryland.  Winds are light.

Tomorrow (Wednesday): The easy part of the forecast: a mostly sunny day and chilly day, with highs 38-44.  Winds are from the west at around 10-15 mph.

See Matt Rogers’ forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter . For related traffic news, check out Dr. Gridlock.


Miracle on 34th St. Monday night (Erin Kelly via Flickr)

Links of the day: There’s so much weather news each day, that’s it often hard to keep up.  I’ll try to occasionally link to worthwhile reading material, that we haven’t been able to cover on CWG…

The global temperature jigsaw (RealClimate)
A Better Way To Weather the Satellite Gap (Space News)
Other East Coast Storms Matched Or Exceeded Superstorm Sandy’s Power (Inside Science)
New Technology Targets Slick Winter Roads (UCAR)

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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Wes Junker · December 17, 2013