There is an increasing potential of a powerful coastal storm for Sunday-Monday. These are the three scenarios.
Scenario 1 50% chance of happening
Precipitation starts early Sunday in Pennsylvania and New York state as some rain or snow showers. Next a plume of moisture develops from the ocean. This drops heavy rain in New Jersey, eastern New York and souther New England. Northern New England excluding coastal Maine will get into some snow. The heavy rain will then likely end as some snow or freezing rain. In this scenario the Major cities would get little to no snow accumulation. However, northern New England, especially northern Maine would pick up a significant amount of snow in this scenario.
Scenario 2 25% chance of happeNing
In this scenario the storm misses the majority of us. Precipitation starts as rain for eastern New England. Throughput the day on Sunday the precipitation moves from rain to snow from the west to the east. The Boston area could pick up a couple of inches of snow. Snow amounts will rapidly increase to the north and west of the coast. As for NYC and DC this would not really be a storm at all with just some snow showers.
Scenario 3 25% chance of happening
In this scenario precipitation starts out as heavy rain for NYC and east. The storm then tracks through Long Island and New England. This scenario would produce the strongest storm so wind could also be a problem. As cold air filters in the precipitation switches to snow in New York State, New Jersey and eastern Pennsylvania. The snow will fall heavy at times and persists throughout the night. As for snowfall totals everywhere in New England excluding the mountanous areas picks up no snow. Northern New York state would pick up the most snow with 2-3 feet possible. However, areas as far south as NYC could pickup significant snow.