From the ABC 7 Weather team

D.C. snow forecast for Sunday and Monday

March 22, 2013 - 01:15 PM
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Here it is late March and snow is in the forecast yet again. Check out our latest thoughts on the timing and potential accumulations.

Another late season winter storm is expected to develop in the lee of the Rockies tomorrow before moving across the U.S. into the D.C. area late Sunday into Monday. Snowfall looks likely from portions of Colorado, through the Central Plains, Mississippi Valley and Ohio Valley before finally making its way to the Mid Atlantic.

Winter Storm Watches and Warnings

What to Expect

This system is looking rather similar to snowquester in some respects, with a much higher likelihood for snow west of D.C. especially in the higher elevations. We're not expecting quite as much snow, as parts of the Blue Ridge and Alleghany Mountains saw over a foot of snow with that storm.

For the D.C. Metro, snowfall accumulations will again be on the low end. We may actually see the scenario where snow is falling but doesn't actually accumulate, as surface temperatures should remain above freezing for the majority of the event if not for its entirety. It will be something to look at around town, but high impacts do not appear likely at this point for the Metro and points east.

Timing

Precipitation is expected to move into the area late on Sunday, making it to D.C. by the late afternoon or evening hours. At this point evaporational cooling will lead to light snow at first, but it may become more moderate at times overnight into Monday morning. Snow will continue to be possible throughout the day on Monday as the low progresses off the east coast. Flurries may even linger into Tuesday.

Timing of the snow on our Microcast Model

Snowfall Potential

Well, let's see... It'll be March 24th and 25th, there is a much higher sun angle, surface temperatures should be above freezing, there is no real cold air in place until the system pushes east of D.C., there's a lot working against snow. Again, this will be a lot like last week.

Probability of 1" or more of snow for 24 hours from Sunday to Monday morning

With all of that out there, snowfall totals should be light around the immediate D.C. area, with our current thoughts around an inch or so in the grassy surfaces in the western suburbs. D.C. and points east should have enough rain mix in that there really won't be any accumulations. The mountains and higher elevations to the west may see a few inches, but again mainly on side roadways and the grass. Higher traveled roads should be better unless you are traveling as far west as I-68 where there may be complications.

As always, changes are likely as this storm hasn't quite developed out of the Rockies just yet. We will have better information this weekend and will continue to keep you updated over the next 48 hours.

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