This a nice overnight discussion from WPC
Northeast...
Days 1-2...
A deep upper trough traversing the Mississippi Valley on Sunday
spawning a wave of low pressure in the Southeast will track up the
Southeast coast Sunday night and off the New England coast by
Monday morning. Ahead of the upper trough, unusually rich moisture
for late January races up the Eastern seaboard Sunday night. At
the same time, a sufficiently cold air-mass will reside over the
interior Northeast. There is a slight chance (10-20% chance) for
freezing rain accumulations >0.1" in parts of the central
Appalachians of WV/VA and the Catskills. There is a rather large
swath of 40-60% probabilities for at least a very light coating of
freezing rain from the Blue Ridge and Laurel Highlands to the
Poconos today as well. Temperatures will not be sub-freezing along
the I-95 corridor to result in periods of snow Sunday evening, but
their more inland and elevated neighbors to the north and west
have much better odds of receiving heavy snow, especially from the
southern tier of NY on north and east into central ME. Strong
vertical ascent beneath the right-entrance region of a jet streak
lifting north over ME and southeast Canada, combined with
anomalous moisture content (PWs >90th climatological percentile
according to NAEFS at 06Z Mon), will account for heavy periods of
snow from the Catskills and Adirondacks on east to the Berkshires,
southern VT and NH, and just north of the ME coastline Sunday
night into Monday morning. After the initial front end thump via
850-700mb WAA Sunday night, the 850mb low forming over the
southern New England coast early Monday morning directs low-level
moisture flux within easterly flow back into southern New England.
This conveyor belt of Atlantic moisture will lead to a brief
deformation axis of snow that could result in a couple inches of
snow across southern New England on Monday morning. Latest WPC
PWPF shows 40-60% probabilities for >8" of snow in the Catskills,
northwest MA, and portions of the Green and White Mountains of VT
and NH. There are also some