Here is the Boston-New York closeup. Note the extreme gradient between the coast (Logan Airport where 3-6" is expected) and areas farther inland and at higher elevations.
Here is the Washington-Baltimore closeup. Reagan airport will have 2-4 inches with higher amounts at Dulles.
here. If you can, take advantage of the waivers to beat the storm.
UPDATE: 3:10PM. Here are the warnings issued by local NWS offices. Pink is a winter storm warning. The bluish is a winter weather advisory (a lesser condition) for lighter amounts of accumulating snow.