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Forecast Discussion for New York City/Upton, NY

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078
FXUS61 KOKX 170705
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
205 AM EST Sat Jan 17 2026

.WHAT HAS CHANGED...
Confidence is increasing in light snowfall accumulation on
Sunday for eastern Long Island and CT. There is more uncertainty
with locations farther west.

&&

.KEY MESSAGES...
1.) A Winter Weather Advisory remains in affect until 4 PM today for
western Passaic, Orange and Putnam Counties. Forecast snow totals in
these areas are between 2 and 4 inches. Other ares in the Lower
Hudson Valley, western CT and northeast NJ will likely see between 1
and 2 inches. Elsewhere less than half an inch is expected.

2.) A coastal low will likely bring more light snow accumulation to
the area on Sunday. The highest confidence in snow continues to be
for the eastern half of the area, with more uncertainty for western
locations. Latest forecast has 1 to 3 inches for southern CT and
Long Island with an inch or lower for other locations.

3.) Cold weather is expected Monday through Friday with the coldest
period Monday night through Tuesday night, with sub freezing
highs Tuesday. No record cold expected through the period.

&&

.DISCUSSION...
.KEY MESSAGE 1...
Low pressure is moving through the Great Lakes and warm
advection is underway in our area. The first batch of snow is
currently just west of the area and should move into the Lower
Hudson Valley shortly. This seems to be associated with the
aforementioned warm advection and an upper level shortwave.
Later today, another area of precipitation approaches from the
west. This looks to be associated more with a cold front. This
front does not appear to be too strong, but there is enough
moisture and lift to bring an additional couple of tenths of
liquid to the area.

Anything that falls today north and west of NYC will likely fall
as all snow. Other areas could see brief snow before a
changeover to a mix or all plain rain. With temperatures already
running warmer than forecast, there is low confidence in any
snow accumulation for NYC, western LI and coastal CT.

.KEY MESSAGE 2...
A shortwave embedded in the larger upper level trough over the
eastern US will lift towards the area on Sunday. This will aid in
surface low pressure development near the southeast US coast.
Track variability continues to lessen with the latest 00z
guidance. Confidence is increasing in a light snowfall
accumulation for eastern LI and CT, but uncertainty remains
farther west. AI guidance and some deterministic guidance seems
to be trying to meet in the middle the last few runs. Last few
runs of the AIGFS and EC-AIFS have trended just slightly farther
southeast with the low center and lower with QPF. Latest
deterministic GFS and NAM have trended slightly closer to the
coast.

Confidence is high enough at this time to forecast 1 to 3 inches
for southern CT and Long Island and an inch or lower elsewhere.
However, there is some concern now with surface temperatures and
how well snow will actually be able to accumulate in some of
those eastern areas. This trend will have to be monitored, but
for now have kept forecast at likely snow with chance/slight
chance rain. It could be a situation where snow has a hard time
sticking at first with light intensity. Lift in the DGZ looks to
be stronger Sunday afternoon which would help increase snowfall
intensity.

.KEY MESSAGE 3...
Cold weather will remain across the region next week, with,
temperatures remaining below normal much of the time. The
coldest period will be Monday night through Tuesday night as
Canadian cold air moves into the region behind a cold frontal
passage Monday night. Temperatures during this period will be as
much as 10 to 20 degrees below normal. Despite the anomalously
cold air no records are expected to be set. And with windy
conditions Monday into Tuesday, wind chill values will remain
higher than cold weather advisory criteria. For Wednesday and
Thursday, temperatures will be near normal to near 5 degrees
below normal. Another shot of cold air moves in for Friday and
Saturday, with temperatures both days remaining right around or
below the freezing mark. There will be minimal chances of light
snow and/or light rain Thursday into Friday as weak low
pressure systems pass near the region.

&&

.AVIATION /06Z SATURDAY THROUGH WEDNESDAY/...
A frontal system approaches moves across the terminals into this
evening.

Mainly VFR through 12z. Light snow should begin developing after 08z
at KSWF and by 10z for KHPN with potential of light snow 10-12z for
NYC terminals. MVFR conditions are also possible with the initial
light snow. Light snow should then prevail north and west of NYC
terminals after 12z with IFR possible into the early afternoon.
Elsewhere, conditions will likely remain VFR until 17z-21z when a
period of a snow mixed with rain and MVFR conditions move through
NYC terminals and then Long Island and southern CT terminals 19-22z.
VFR then prevails this evening into tonight.

SSW winds mainly under 10 kt early this morning will increase a bit
after day break and remain around 10-13 kt into the afternoon. Winds
veer to the SW this evening as speeds gradually diminish overnight.

Snow Accumulations:

SWF: 2-4 inches
HPN/TEB: An inch or less
JFK/LGA/EWR/BDR: Little to no accumulation

 ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...

Amendments possible for potential -SN or -RASN as well as for flight
categories through this afternoon.

.OUTLOOK FOR 06Z SUNDAY THROUGH WEDNESDAY...

Late tonight: VFR

Sunday: Chance of MVFR or lower in snow, mainly afternoon into
evening with highest chance east of NYC metro terminals.

Monday: VFR. WSW wind gusts 20-25 kt.

Tuesday: VFR. W wind gusts 20-25 kt.

Wednesday: VFR. W to SW winds 15-20 kt.

Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90

&&

.MARINE...
A Small Craft Advisory remains in effect on the ocean waters due to
elevated seas. Late tonight the Advisory comes down for the western
ocean zone but it has been extended for the central and eastern
ocean zones through Sunday.

There will only be a brief lull Sunday night before seas and winds
start to increase on Monday. Small Craft Advisory conditions are
expected much of next week for the ocean waters and Monday and
Tuesday for the non-ocean waters.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...Winter Weather Advisory until 4 PM EST this afternoon for
     NYZ067-068.
NJ...Winter Weather Advisory until 4 PM EST this afternoon for
     NJZ002.
MARINE...Small Craft Advisory until 6 PM EST Sunday for ANZ350-353.
     Small Craft Advisory until 1 AM EST Sunday for ANZ355.

&&

$$

DISCUSSION...BC/JT
AVIATION...BC/DS
MARINE...BC/JT

Previous Forecast Discussions may be found at
NWS New York City/Upton, NY (OKX) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)

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