Well, since everyone apparently considers Winchester, VA, Cumberland, MD, Cleveland, Ohio, and the South Pole as part of the DC area anymore, yes, there could be snow. But if we're talking what I would personally consider the DC area - inside the Beltway - then I'll believe it when I see it.
I for one hope this misses us as there are many people who's jobs include snow cleanup and removal. We certainly dont want to be out in this mess, away from our families on Christmas. Go north! Go north!