AREA FORECAST DISCUSSION
National Weather Service Albany NY
636 AM EST Mon Nov 27 2023
SYNOPSIS...
Steady precipitation will taper off early this morning, as low
pressure quickly tracks into Maine. In its wake colder air will
start to filter in today with breezy conditions, resulting in
heavy lake effect snow bands developing off Lake Ontario which
will continue through Tuesday. The heaviest snowfall is expected
across the western Adirondacks, although moderate accumulations
may occur into the western Mohawk Valley with lighter snow
showers elsewhere.
NEAR TERM /THROUGH TONIGHT/...
Lake Effect Snow Warning for northern Herkimer and Hamilton
Counties from 12 PM today through 12 AM Wednesday...
Flow trajectory looks to be fairly steady state through
tonight, with forecast soundings from the NAM indicating
equilibrium levels increasing to up to 650 mb by early Tue
morning with Moderate/Extreme lake-induced instability. This
should result in snowfall rates increasing to 1-2"/hour across
N. Herkimer into Hamilton Counties. This is supported by 00Z
HREF max snow ratios. Inland extent is also expected to increase
(CSTAR research), as the curvature of the trough favors an
upstream multi-lake moisture connection. So the heaviest snow
bands could extent well into Hamilton County. Additional
accumulations of 6-12" should fall in the most persistent bands.
Outside of the snow bands, just widely scattered snow showers
expected with perhaps a dusting in some spots. It will turn
colder, with lows ranging from the upper 10s in the mountains to
mid 20s in valleys. A westerly wind will persist, with
occasional gusts around 20-25 mph.
SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
Lake Effect Snow Warning for northern Herkimer and Hamilton
Counties from 12 PM today through 12 AM Wednesday...
Winter Weather Advisory for Lake Effect Snow for southern
Herkimer County from 7 AM Tuesday to 7 AM Wednesday...
Total accumulations in N. Herkimer and Hamilton Counties
expected to range from 7-14" with locally higher amounts in the
most persistent bands, with 3-6" in S. Herkimer just north of
the Thruway. As the snow bands shift south, they could extend
down the Mohawk Valley into the Capital District towards the
evening commute time. Residence time will not be long, however a
quick burst of snow could lead to some brief travel issues.
Will continue to monitor, and for now will at least increase
PoPs to likely into the Capital District for a period of snow
showers. It will become breezy/gusty Tue afternoon, with W-NW
winds gusting 25-35 mph in favored areas. High temperatures will
also be below normal with highs only in the 30s in lower
elevations and 20s in the mountains.
Another disturbance looks to pass through in the NW cyclonic
flow regime Wed afternoon into the evening, which will lead to
mainly scattered snow showers across the western Adirondacks and
Mohawk Valley. With dry ambient environment, no precip is
expected outside of this area. Temperatures will remain below
normal both for highs Wed and lows Wed night under the influence
of the upper level trough.
LONG TERM /THURSDAY THROUGH SUNDAY/...
A period of fair weather is possible Saturday through early
Sunday as high pressure builds across. However, the next system
approaching from the south and west could allow for clouds and
spotty precipitation to develop by late Sunday. There could be
enough cold air, at least in the lower levels, to allow P-type
to initially favor snow or a wintry mix for some areas.