I have to admit I am surprised at how the ensembles have been holding steady during the past forty-eight hours. If this trend holds up… Winter Storm Watches will be needed Wednesday!
Remember 2009? … I took the picture below from beautiful, Arlington Virginia in December of 2009 just after our first major snowstorm since 2003!
Euro “Bomb”/”Bombogenesis” – rapidly deepening coastal cyclone (image below courtesy tropicaltidbits.com) — Doesn’t get any more exciting in the world of weather than this! A “Category 2 Hurricane” parked off the Mid-Atlantic coastline… oh the thought of blowing/drifting snow…
Global Ensemble Forecast System – in good agreement with Euro
Canadian Model – Also in decent agreement with Euro and GFS
So what can change? The exact track will be key. We will know a lot more tomorrow evening as the shortwave reaches the Pacific Northwest coast. Stay Tuned!
DC Storms 
New to the area–thanks for doing this, very helpful. Sounds like a big one could be coming!