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Forecast Discussion for New York City/Upton, NY

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102
FXUS61 KOKX 081947
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
347 PM EDT Fri May 8 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...
1. A round of wet weather Saturday and Saturday evening.

2. Mainly dry on Sunday, followed by another round of rain
Sunday night into a portion of Monday.

3. Unsettled weather expected toward mid to late next week.

&&

.DISCUSSION...
KEY MESSAGE 1...

A broad upper trough across the NE quarter of the country will
send developing low pressure across the Great Lakes tonight
into Saturday, sending a warm front across the area in the
morning before washing out. There will be a chance of warm
advection showers tonight, with the best chance and greatest
coverage across western portions of the Lower Hudson Valley.
Widespread showers on Saturday will then overspread the area
from west to east, likely not reaching LI and southern CT until
afternoon. A mid level shortwave trough interacting with a
southerly low-level jet will provide the brunt of the lift.
Additionally, with some weak elevated instability, an isolated
thunderstorm is a possibility. Best chance will be at the coast.
Rainfall totals of 0.25 to 0.50 inches can be expected across
the area. Rain ends by early evening for most locations with the
possible exception of eastern LI and SE CT.

Also, added in some patchy fog for Saturday night. MOS is
aggressive at some locations. Confidence is low at this time.

Highs Saturday will top out near or just below normal with
mostly cloudy skies and southerly winds gusting up to 20 mph.

KEY MESSAGE 2...
Sunday looks to be mainly dry between systems as a cold front
approaches from the west, There is a chance for scattered
showers late in the day, mainly north and west of NYC. A more
organized rainfall event is then expected Sunday night into
Monday as an amplifying upper trough sends the cold front
across the area with a frontal wave passing to the south and
east. Another half inch of well-needed rainfall is expected at
this time. The system is trending more progressive with less
rainfall across the interior.

NBMv5 looks too cool Saturday night (warm sector) and too warm
Sunday based on trends and what is being shown in both raw
consenus and MOS. For lows, went warmer in the lower to mid 50s,
and for highs, 70 to 75. Weighted in some CONSALL. Sunday could
be a bit tricky based on how quickly cloud cover increases
ahead of the approaching frontal system.

KEY MESSAGE 3...

Low pressure over the Northern Plains region on Tuesday is
expected to dive south over the southern Great Lakes region Tuesday
night, then head east into the day Wednesday, then slowly sink
southeast, ejecting off the Southeast Coast late in the day Thursday
into Thursday night. This coastal low then slowly heads northeast
through the rest of the forecast period, with some slow
strengthening.

Rain showers associated with the low, and an inverted trough
extending northward, which would likely be the primary focus for the
showers for our area, will move through from the west late Wednesday
into Wednesday night. Of course, this far out, there are timing
differences with the track and strength of the low, which would lead
to differences in timing of any precipitation and amounts. This also
leads to high uncertainty with the track of the eventual coastal low
that passes south and east of the area at the end of the week, and
whether we see any rainfall as it heads out to sea.

&&

.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
Multiple weak disturbances will pass through the region as high
pressure remains to the south.

VFR conditions will prevail into Saturday morning. While a few
sprinkles or light showers are possible through the remainder of
the afternoon, they should not have significant impacts to
ceiling/visibility. Conditions then lower to MVFR beginning
late Saturday morning in showers.

W-WSW flow around 15 kt with gusts to around 25 kt this
afternoon will veer back to the W-WNW after about 21Z before
diminishing to 10 kt or less early this evening. A light S-SE
flow will then prevail through the overnight before increasing
to around 10 kt Saturday morning.


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

No unscheduled AMD expected.

.OUTLOOK FOR 18Z SATURDAY THROUGH WEDNESDAY...

Saturday: Showers, with slight chance of late day thunder.
MVFR cond expected, IFR possible. A few gusts to 20 kt are
possible at eastern terminals.

Sunday: VFR to start, with MVFR or lower conditions developing
in showers during the evening/overnight. SW winds G15-20kt at
the NYC metros.

Monday: Showers with MVFR or lower conditions, tapering off
during the late afternoon and early evening.

Tuesday: Mainly VFR. NW winds G15-20kt.

Wednesday: Mainly VFR, with MVFR or lower conditions in showers
Wednesday night. S winds G15-20kt.

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

&&

.MARINE...
A warm front passes through the area Saturday morning with a
chance of marginal SCA conditions in a S-SW flow. Both winds and
seas will be close with 25 kt gusts and 5 ft seas on the ocean.
Eastern LI Sound and the LI bays also look real marginal, but
with a southerly low-level jet moving across the area, opted to
stay with the SCA.

Thereafter, winds and waves are expected to remain below SCA
criteria through Wednesday. However, waves build late in the day
Wednesday as a southerly flow increases due to an approaching
low pressure system to the west. Depending on the track and
strength of the low, 25 kt gusts and 5 ft seas may make their
way in sooner than forecast Wednesday afternoon, especially from
Sandy Hook to Fire Island Inlet.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...Small Craft Advisory from noon to 8 PM EDT Saturday for ANZ331-
     332-340.
     Small Craft Advisory from 11 AM to 8 PM EDT Saturday for
     ANZ345.
     Small Craft Advisory from 11 AM Saturday to 2 AM EDT Sunday
     for ANZ350-353-355.

&&

$$

DISCUSSION...JP/DW
AVIATION...FEB
MARINE...JP/DW

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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