a snippet from OKX 4:36pm discussion,
"
.LONG TERM /MONDAY THROUGH SATURDAY/... The low will track
slowly to Cape Cod through Monday night as it continues to
strengthen. Minor differences in the thermal profiles between
ECMWF, NAM, and GFS, with GFS a bit warmer than the other two.
Despite these minor differences, this continues to be a low
confidence precipitation forecast, especially in the metro area
and along the coast, with higher confidence inland. As the
surface and 850 mb lows pass east of Long Island, colder air
will filter in, allowing the wintry mix line to move south
Monday morning and afternoon. There will also be uncertainty in
precipitation intensity Monday morning and afternoon as models
are hinting at a heavy band of precipitation developing
somewhere across northeast New Jersey and the Lower Hudson
Valley, that might make its way into the New York City metro
area, but where exactly this sets up is still largely unknown.
This band will also add to the uncertainty in precipitation type
as dynamic cooling of the column would occur in the heavier
precipitation, changing precipitation back to snow quicker than
forecast. With all that in mind, thinking is that a changeover
to all snow is expected early Monday evening for the New York
City metro area and western and central Long Island. The Twin
Forks of Long Island may not changeover completely or at all.
As for snowfall amounts, 6 to 12 inches are possible across portions
of Northeast New Jersey, the Lower Hudson Valley and inland
southeastern Connecticut. A Winter Storm Watch continues for these
areas. This is a long duration event, with a snow to wintry mix (or
rain) to snow changeover for many places. There may be impacts the
Monday morning and evening commutes depending on location and
precipitation type transitions.
3 to 6 inches are expected across southern Westchester and portions
of Northeast New Jersey and portions of inland southeastern
Connecticut.
1 to 4 inches are expected for New York City, metro New Jersey,
central and western Long Island, and coastal .
Less than an inch is expected for the Twin Forks of Long Island and
coastal New London.
Liquid equivalent amounts will generally be between 1 and 1 3/4
inches."