922
FXUS61 KOKX 190800
AFDOKX
Area Forecast Discussion
National Weather Service New York NY
400 AM EDT Thu Sep 19 2024
.SYNOPSIS...
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Low pressure hovers southeast of Long Island through early this
evening and then moves slowly farther out into the Atlantic
thereafter through Friday night. Low pressure lingers offshore
through Saturday. High pressure builds in from the northeast
Sunday through Tuesday. A frontal system approaches from the
west Wednesday into Thursday.-- End Changed Discussion --
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
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Upper levels depict an overall a trough pattern but are devoid of
any jet streaks or wind maxima.
A mid level trough remains across the area. PVA increases across
eastern sections of the region for the afternoon into early evening.
Low level jet starts to develop to the west and northwest of the low
center, potentially expanding and getting over eastern portions of
the region late today into early this evening.
Low pressure remains nearly stationary southeast of Long Island
right near the 40N/70W benchmark through today. Low pressure does
deepen during this timeframe, dropping nearly 4mb. NAM appears to
have more rain across the local area compared to the GFS, ECMWF and
Canadian models.
Conditions have been drier than previously forecast so going to
continue with a downward trend in POPs. BUFKIT model soundings are
also indicating lots of dry air between 900 and 600 mb, limiting
moisture needed for collision colascence. Favoring the overall drier
consensus with regards to the rainfall forecast. Expecting mainly
dry conditions through today.
Max temps today use 3/4 MET (cooler) and 1/4 MAV (warmer).-- End Changed Discussion --
&&
.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...
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Upper levels continue to indicate both a trough pattern and the lack
of any jet streak or wind speed maxima.
Mid level trough moves slowly east of the region, and eventually
becomes a cutoff low that slightly deepens Friday through Friday
night. Higher PVA remains mainly across eastern sections of the
region, Southern CT and Long Island.
Low level jet remains west to northwest of the low center and stays
just outside of the region or just brushing over the eastern parts
of the region within SE CT and Eastern Long Island.
Low pressure slowly moves farther out into the Atlantic and remains
within a few mb of its previous central pressure tonight through
Friday night.
Canadian and ECMWF models show more rain moving in from NE to SW
late tonight into early Friday to better agree with the NAM. GFS
still keeping the area dry. GFS still mainly dry Friday into early
Saturday and NAM for this particular time frame also decreased the
rain. The ECMWF and Canadian models depict relatively more rain
across the area, especially for Southern CT and Long Island,
compared to the NAM and GFS.
POPs adjusted to have chances for eastern sections, brief likely for
Friday with otherwise slight chances to the west for this tonight
through Friday night timeframe.
Min temps tonight use MAV/MET even blend.
Max temps Friday use NBM.
Min temps Friday night use NBM with a slight adjustment up for Pine
Barrens LI.-- End Changed Discussion --
&&
.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
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**Key Points**
*Improving conditions Saturday into Sunday as high pressure builds
into the region.
*Downward temperature trend to slightly below normal temperatures
expected by early next week.
*A frontal system Wednesday into Thursday will bring with it
additional chances for showers.
Global guidance continues to depict the slow moving upper low/trough
situated over New England to start the period. There are varying
degrees of eastward progression on Saturday, though there is
consensus that heights will begin to rise as the low moves east by
Saturday afternoon. Thus, expecting a cloudy, and windy, Saturday
with perhaps some lingering showers thRough Saturday evening,
primarily for eastern Long Island and SE CT. Northeast winds will
begin to relax by Sunday afternoon as the low departs and the
pressure gradient weakens.
Thereafter, upper ridging begins to build in with surface high
pressure nosing in from the north. Dry conditions are generally
expected Sunday through Tuesday. A slightly cooler airmass advects
into the area for Monday and Tuesday under easterly flow and highs
in the upper 60s and low 70s.
The airmass begins to moderate somewhat on Wednesday, though still
below normal in the low 70s, with increasing cloud cover and a
chance of showers from an approaching frontal system to the west.
Guidance varies on timing, with some starting showers as early as
Tuesday night, while others keep the rain away until Thursday
morning. Overall, not expecting this to be a very impactful system,
rather just another chance for passing showers as the low passes
north with a front dragging through our area.
The NBM was primarily used for the forecast, except some adjustments
were made to POPs using CONSALL and some low temperatures
were blended with BCCONSALL on Saturday, Sunday and Monday nights.-- End Changed Discussion --
&&
.AVIATION /08Z THURSDAY THROUGH MONDAY/...
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Low pressure remains offshore, southeast of Long Island,
through Friday.
VFR. There is a chance of MVFR this morning, with the best
chance at KGON, and possibly into KBDR and KISP, but very low
confidence except for KGON. Likely will not drop to MVFR for NYC
terminals. With a large layer of dry air aloft and a lack of
forcing and lift, will likely be staying dry for the entire TAF
period, so all SHRA chances have been removed from the TAFs.
Higher confidence with the winds. Winds remain NE to N
increasing overnight, especially at the coast terminals, then
winds increase during the day Thursday with gusts 20-25kt.
...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...
Patchy stratus may develop later this morning leading to
occasional MVFR conditions, but the chances have decreased.
Expecting VFR this morning, but amendments may be needed should
unexpected conditions occur.
OUTLOOK FOR 00Z FRIDAY THROUGH MONDAY...
Saturday: VFR. MVFR east of the NYC terminals possible in
showers, but low chance of occurring. NE gusts around 25kt
possible.
Sunday: VFR. NE gusts 20-25kt possible.
Monday...VFR.
Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90-- End Changed Discussion --
&&
.MARINE...
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SCA level seas remain on the ocean and are expected to stay through
Friday. SCA level winds will be more difficult to get but are
expected to get more into that range for Friday. SCA kept for non-
ocean waters as some model guidance continues to indicate SCA level
gusts for this afternoon and tonight. However, due to decreasing
confidence did not extend non-ocean zones through day on Friday with
SCA. Friday night, likely ocean remains with SCA with non-ocean
waters having some location get SCA level gusts probably.
5-7 ft waves and 25-30kt gusts will continue to be an issue on ocean
waters this weekend and at the start of next week. While the LI
Sound and Bays may not see 5+ ft waves, gusts near 25 kt will be
possible until Sunday night.-- End Changed Discussion --
&&
.HYDROLOGY...
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There are no hydrologic issues through the middle of next week.-- End Changed Discussion --
&&
.TIDES/COASTAL FLOODING...
Coastal flood advisories have been expanded to include SW CT
tonight in addition to the one already in effect for southern
Queens and Nassau. A statement remains up for areas adjacent to
NY Harbor. Advisories were then expanded for the Thursday
morning/early afternoon high tide cycle to include locations
adjacent to NY Harbor, western LI Sound, and the south shore
back bays of LI. A statement is in effect for eastern LI and and
New Haven county CT. Advisories will then continue for the
south shore bays and portions of western LI Sound for Thursday
night.
The combination of high astronomical spring tides and deepening
low pressure over the western Atlantic will result in several
rounds of mainly minor coastal flooding over the next couple of
days. Localized moderate coastal flooding is possible for
souther Nassau and SW Suffolk, especially Thursday morning. In
addition, as the low slowly pulls away over the weekend, tidal
piling from a long period easterly swell will continue although
astronomical tides will be gradually coming down. Thus, the
potential is there for continued minor coastal flooding into the
weekend, especially across the south shore bays of western LI
and the SW CT coast.
A high rip current risk continues through Friday for the ocean
beaches due to building E/NE swells and gusty N-NE winds. Seas
on the oceanfront will build to up around 6 ft. However, a high
surf advisory has not been issued as seas are forecast to stay
below criteria of 7 ft. Minor beach erosion is expected, but any
dune issues should be isolated.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
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CT...Coastal Flood Advisory from 10 AM this morning to 2 PM EDT
this afternoon for CTZ009.
Coastal Flood Advisory from midnight tonight to 3 AM EDT
Friday for CTZ009.
NY...Coastal Flood Advisory from 10 AM this morning to 2 PM EDT
this afternoon for NYZ071-073-078-177.
Coastal Flood Advisory from midnight tonight to 3 AM EDT
Friday for NYZ071.
Coastal Flood Advisory from 8 AM to 11 AM EDT this morning for
NYZ072-074-075.
Coastal Flood Advisory from 8 PM to 11 PM EDT this evening for
NYZ074-075.
High Risk for Rip Currents through Friday evening for NYZ075-080-
081-178-179.
Coastal Flood Advisory from 9 AM this morning to 2 PM EDT this
afternoon for NYZ080.
Coastal Flood Advisory from 8 PM this evening to 2 AM EDT
Friday for NYZ080-178-179.
Coastal Flood Advisory from 8 AM this morning to noon EDT
today for NYZ178-179.
NJ...Coastal Flood Advisory from 8 AM to 11 AM EDT this morning for
NJZ006-106-108.
Coastal Flood Advisory from 8 PM to 11 PM EDT this evening for
NJZ006-106-108.
MARINE...Small Craft Advisory until 6 AM EDT Friday for ANZ331-332-335-
338-340-345.
Small Craft Advisory until 6 PM EDT Friday for ANZ350-353-355.-- End Changed Discussion --
&&
$$
SYNOPSIS...JM/BR
NEAR TERM...JM
SHORT TERM...JM
LONG TERM...BR
AVIATION...BR
MARINE...JM/BR
HYDROLOGY...JM/BR
TIDES/COASTAL FLOODING...