NWS
“The Probabilistic Winter Precipitation Forecast (PWPF) graphics
have been updated through 72 hours, which is 00z (7pm) Monday
evening. The current forecast has advisory level snow across the
interior (avg of 3 inches) with near warning level (avg of 6
inches) near the coast. Additional snow is possible Monday night
into Tuesday, but amounts are much less certain. There may also
be a sharp cut off in amounts somewhere across the region,
which at this time looks to be somewhere across the interior. If
the low tracks a bit closer to the coast, then the northward
extent will move further inland and amounts there will be
increased. This could also introduce potential of mixing with
rain on eastern Long Island. A track further south and east
would mean less snow across the board. These details will be
hopefully fine tuned through the weekend. Our official forecast
keeps the precipitation snow with the surface low and mid level
low centers all passing south of the region. These are favorable
tracks to keep a more northerly flow holding any warming off
the ocean down until precip rates decrease or if there is any
dry slot. Again this looks like a concern for only portions of
Long Island at this time.
Looking at probabilities from the GEFS and ECMWF EPS, the
probability of seeing 6 inches or more has increased for the
southern portion of the area in the last 24 hours. The winter
storm has the potential to produce a foot of snow somewhere in
the CWA. This will all be dependent on mesoscale banding and the
track of the system. Strong winds will also be possible,
especially across the southern portion of the region. Gusts 35
to 45 mph cannot be ruled out at some point Monday into Monday
night.”