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(Map above is the ECMWF model forecast for 1 PM Tuesday afternoon. The purple line that stretches from NY City to Durham, CT to south of Boston is roughly where the boundary between snow and mixed precipitation or rain is forecast to be at that time by this model. The other models currently have this line located furhter to the south & east for the same time period).

There are still a number of issues that have yet to be resolved regarding Tuesday's storm via a model consensus. The exact track is till being debated, as is the placement of the rain/snow line during the height of the storm. While the potential for 20" of snow still exists in some places, the possibility of some areas seeing less than 10" due to mixing/changing to rain/sleet and/or the forward speed and/or track of the storm cannot be discounted at this point. There does seem to be a consensus though, about two things: 1) Current timing has the snow beginning from south to north/southwest to northeast between about 2 AM-7 AM Tuesday. It starts in NY City first and reaches northern MA last. Tapering off from south to north during the second half of the afternoon Tuesday (lingering flurries/snow showers into Wednesday, though. 2) It looks like the storm will be moving a little faster than originally progged. This will tend to keep snow amounts down a tad, however expect to be doing some shoveling/snow blowing Tuesday and/or Wednesday. Whether or not the models reach a consensus by Monday, I will post a map of projected snow amounts tomorrow. This is also likely to be a windy storm. As of now it's looking like we will be dealing with northeast to north winds at 15-30 mph, gusting over 40 mph (especially near the coast), however this will also be determined by the precise track taken by the center of the storm.