PM Update: Heavy rain tonight; rain/snow showers and strong winds Wednesday

9:30 p.m. update: Moderate to heavy rain has enveloped the region and will continue for a few more hours. However, the storm is moving a bit faster than expected earlier, so rainfall totals are probably going to be at the low end of estimates…closer to 1.5 or 2 inches than 3 inches. We see quite a range of temperatures over the region with 48 degrees in Annapolis, and 37 at Dulles.

No changes for tomorrow’s forecast (see below): intermittent rain showers possibly changing to snow showers in the afternoon, especially west of town, and windy!


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.

A cold, light rain made for a miserable day, with some isolated reports of an icy glaze in our far northern and western suburbs. A driving rain is likely overnight across the entire region, with big fluctuations in temperatures. On Wednesday, temperatures gradually fall and lingering rain showers may mix with and change to “conversational” (i.e. mostly non-accumulating) snow showers, especially in our western suburbs.

Through Tonight: Rain, heavy at times, throughout the night. (Note: any freezing rain in outlying north and west areas changes to plain rain early on). One to two inches of additional rain are possible, with locally higher amounts. Along and east of I-95, temperatures rise into the 40s and perhaps 50s (through 2 a.m.), highest readings in southern Maryland.  They then fall back towards 40 by morning. West of I-95, temperatures rise into the upper 30s (far west) to mid-40s (close to the District) before 1 a.m., and then fall back to 35-40 by morning.

Related: A deluge and wild temperature swings tonight in D.C.

Tomorrow (Wednesday): Rain decreases in coverage and intensity early in the morning, with just scattered showers, with temperatures mostly between 35-40. During the afternoon, scattered rain showers may mix with and change to scattered snow showers (between around noon and 3 p.m. west to east), with chances varying from 30 percent east of town to 60 percent in the colder western suburbs. Any accumulation is likely confined to grassy areas (perhaps a coating) – although if heavier snow bands materialize, a few slick spots could develop on roads mainly in the colder suburbs (30 percent chance). Temperatures gradually fall back to 33-37 by late afternoon.

Related: A chance of “conversational” snow in Washington, D.C. Wednesday afternoon

Winds from the northwest crank up during the day: from the northwest at 10-15 mph in the morning, increasing to 15-25 mph in the afternoon, with gusts up to 35 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.

Doppler estimated rainfall totals through 6 p.m. indicate generally around 0.5" from this storm so far, but 1-2" amounts common to the southwest, where the rain is coming from (National Weather Service)

Doppler estimated rainfall totals through 6 p.m. indicate generally around 0.5″ from this storm so far, but 1-2″ amounts common to the southwest, where the rain is coming from (National Weather Service)

Rain and ice totals: Through 6 p.m., about 0.4-0.5″ of rain has fallen over the region.  In western Loudoun and western Frederick counties, a few reports of 0.10-0.20″ glaze of ice were logged by the National Weather Service.

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