Lynbrook, New York Weather Forecast Discussion

021
FXUS61 KOKX 051448
AFDOKX
Area Forecast Discussion
National Weather Service New York NY
1048 AM EDT Fri Sep 5 2025
.SYNOPSIS...
A cold front dissipates over the region today. Another cold front
will approach and slowly move through from late day Saturday into
Sunday. Strong high pressure will build in from the west for next
week.
&&
.NEAR TERM /THROUGH TONIGHT/...
Some fog and low clouds mainly for the interior to start,
otherwise, mostly sunny for much of the day. A dissipating cold
front will probably be somewhere over or near the western
portion half of the forecast area. Weakening moisture
convergence and lift will probably not be enough to produce a
shower, so will go with a dry forecast. The dry weather
continues tonight, but it should feel more muggy today and
tonight than recently as dewpoints average 65-70 through the
period. NBM was used for both temps and dewpoints.
&&
.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
A cold front approaches from the west in the morning, then is
progged to slowly work eastward through the region late in the day
Saturday through Sunday. MLCAPES could be in the range of 1000-2000
J/kg in the afternoon, and with a veering profile coupled with
potentially 30-40kt shear, strong to severe thunderstorms will be
possible. How much clouds and resulting daytime heating remains
somewhat uncertain. Model differences in the timing of the frontal
passage are factors in this uncertainty. So instability could
actually end up greater with better chance of severe weather. As
such, SPC remains with a marginal (5% chance) risk of severe
thunderstorms for most of the forecast area. Main impacts would be
from wind gusts, but large hail will be possible too. Even an
isolated tornado cannot be ruled out over the Lower Hudson Valley
where the best combination of instability with directional and speed
shear would appear to be.
PWATs increase to around 1.75 inches Saturday afternoon and evening.
And with the slow forward motion of the cold front, there is some
hydrologic impact potential as convective cells would have a chance
to train over the same location. WPC has now included most of the
area with a marginal (5% chance) risk for flash flooding for
Saturday. See the hydrology section below for more details.
The cold front continues its slow motion late night Saturday and may
not push offshore until some point Sunday morning. Still a chance of
additional showers Sunday morning from around NYC metro to points
east, then likely dry everywhere for Sunday afternoon. The drier
airmass will be more noticeable away from LI and SE CT, but in any
case, high temperatures end up in the lower to middle 70s with a
trend of diminishing cloud cover. High pressure builds in Sunday
night with dry conditions.
&&
.LONG TERM /MONDAY THROUGH THURSDAY/...
Dry and cooler wx expected for much of next week, with highs in the
70s and lows in the 40s/50s, as a large/strong high pressure system
of Canadian origin moves across from the west.
The NBM was followed for the long term forecast with no significant
changes of note.
&&
.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
A cold front has stalled nearby and will dissipate over the area today.
Another front will approach the area tonight, arriving on
Saturday.
Most terminals have now returned to VFR, though lingering IFR to
MVFR conditions will quickly improve this morning.
Flow is mainly light and variable. Winds will pick up in a
southerly direction within the next 1-3 hours into mid/late
morning. Gusts to around 20-25 kt towards 17-18z for most of
the city and coastal terminals. Gusts will then end toward mid
evening. Winds remain at southerly overnight tonight, 5-10kt.
Southerly winds then increase to 10-15 kt around midday to
early afternoon tomorrow.
...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...
Amendments possible due to changes in flight categories.
.OUTLOOK FOR 12Z FRIDAY THROUGH TUESDAY...
Saturday: Cold frontal passage late with a chance for shwrs and
tstms. SW flow becoming NW.
Sunday: Becoming VFR.
Monday and Tuesday: VFR.
Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90
&&
.MARINE...
Sub-advisory conditions should prevail today, however on the ocean
west of Fire Island Inlet, there is the possibility of marginal
advisory level gusts and seas this afternoon and evening with an
Ambrose jet forming. Winds and seas otherwise diminish overnight,
but then pick up again for Saturday afternoon. Gust on the ocean
could occasionally gust up to around 25kt. Seas could touch 5ft at
times as well.
Sub-advisory conditions are otherwise expected Saturday night and
Sunday. Sub-SCA conditions are expected Monday and Tuesday as well,
with chance that swell could help seas increase to 5 ft on
Wednesday.
&&
.HYDROLOGY...
An inch to two inches of rain is forecast for Saturday afternoon
through Saturday night, though most of this would probably occur in
the later afternoon to evening hours. Locally higher amounts will be
possible as convection enhances the rainfall. Flooding impacts would
more likely be limited to minor urban and small stream flooding, but
flash flooding cannot be ruled out. There is marginal risk (5%
chance) of flash flooding at this time. Confidence in the magnitude
of flooding is relatively low at this time.
&&
.TIDES/COASTAL FLOODING...
There is a high rip current risk today at the ocean beaches, with 4-
5 ft seas and S winds around 15 kt. Winds and swell may be a little
lower for Saturday, so a moderate risk of rip current development is
most likely, but a high risk cannot be ruled out.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...High Risk for Rip Currents until 9 PM EDT this evening for NYZ075-
     080-081-178-179.
NJ...None.
MARINE...None.
&&
$$
SYNOPSIS...
NEAR TERM...
SHORT TERM...
LONG TERM...
AVIATION...JP
MARINE...
HYDROLOGY...
TIDES/COASTAL FLOODING...

NWS OKX Office Area Forecast Discussion