Whether it looks like it on the Surface Maps or not, there are a lot of discrepancies between these two models right now! Most of it has to do with timing the energy. The first picture is of the GFS and its location out 96hrs...
The storm is located where you see the white arrows. Now the GFS is usually fast and this case is no different. To explain my case here is the 12Z ECMWF for 96hrs out, also pointed out by white arrows...
That is a 500-700 mile difference between the GFS and EURO. I believe the GFS has a much better handle on this, right now! This is only explaining things so you can see this the way I am seeing it. With the position here on the EURO it's much slower which will allow it to dig further South than the GFS. If you can see the energry (noted by the pink and purple) over PA and Southern NY, if that doesn't move off to sea the storm won't go North. It will drive it off the NC/VA coast and strengthen there without moving further North.
This is showing a band of very heavy snow from Richmond to Baltimore at 132hrs. This then shifts East and then South. At this point temps are between 30 -36 degrees. Yes, snow can fall at 36 if a.) 850mb temps are cold enough b.) thicknesses are right c.) heavy precipitation doesn't give the snow a chance to melt.
This just a daily explanation of things. I'll post again for you tomorrow as data comes in! Stay tuned!
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