524
FXUS61 KOKX 180606
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
206 AM EDT Sat May 18 2024

.SYNOPSIS...
Weak high pressure remains over the region into Saturday night.
A weakening trough of low pressure approaches from the west and
dissipates by Saturday evening. Otherwise, high pressure
generally remains in control through the middle of next week. A
cold front approaches late in the week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A northeast to east flow will bring low level moisture into
region into morning. And with some weak low level convergence
and lift light drizzle will be possible across eastern LI/SE CT.
Meanwhile, a weak surface trough will be moving very slowly
east and weaken tonight into Saturday. And by Saturday morning a
few showers may move into the western portion of the region
with some weak lift with the trough. The offshore low weakens
Saturday afternoon with lift ending, so end the chances for
drizzle by then.

With little airmass change overnight temperatures will be
similar to Friday morning`s lows. And with more clouds and the
easterly flow high temperatures Saturday will be around 5
degrees below seasonal normals.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/...
The weakening surface trough to the west may move into the
region, and into the surface ridge, and then dissipate Saturday
night. Any lift and showers with this system will then be
ending. Otherwise, weak high pressure remains in control.
Once again with little airmass change temperatures Saturday
night will be in the lower to mid 50s across the region.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
*Key Points*

*Mainly dry with above temperatures Sunday through next week.

*A cold front approaches late in the week with the next chance at
showers, possibly thunderstorms, Wednesday night through Thursday.

Relatively quiet weather is expected Sunday through the middle of
the week. Ridging both aloft and the surface will begin building
over the northeast on Sunday and should remain in control through
Wednesday. The modeling continues to signal the break down of the
ridge late Wednesday as an upper level trough heads east from the
Rockies towards the Great Lakes. There is relatively good agreement
for this shortwave to move across the region sometime late in the
week. However, the guidance is not in agreement on its amplitude and
timing, which impacts the strength of a cold front. This cold front
should approach late in the week bringing an increase in chances for
showers and possibly Thunderstorms. Will continue to use the NBM
given the time range, which looked reasonable for PoPs Wednesday
night into Thursday night. The consensus indicates the front should
be moving through on Thursday, but this could speed up or slow down,
especially with uncertainty with the aforementioned trough and
weakening of the ridge.

Mainly used the NBM deterministic for temperatures, but blended in
the 50th percentile for Monday through Thursday. There is a fair
amount of temperature spread, and the NBM deterministic is lying
closer to the 25th percentile. This is most prominent away from the
immediate coast where temperatures typically are warmer during
onshore flow days. The onshore flow should keep coastal locations in
the upper 60s to lower 70s, but elsewhere should be able to warm
into the upper 70s and lower 80s. Temperatures could be even warmer
(middle to upper 80s away from the coast), especially if the flow
takes on a more westerly component ahead of the front Wednesday or
Thursday.

&&

.AVIATION /05Z SATURDAY THROUGH WEDNESDAY/...
Weak high pressure will be in place today through Sunday, with
a weak warm front dissipating as it moves in from the west tonight.


MVFR cigs likely develop across the eastern terminals (KGON,
KISP, and KBDR) for the morning push, while NYC/NJ terminals
likely remain VFR. MVFR cigs will likely be stubborn for the
eastern terminals through the day, with patchy MVFR cigs
possible in the aft for NYC/NJ terminals. Increasing likelihood
for MVFR cigs spreading west into NYC/NJ terminals tonight.
Isolated shower possible in aft/eve.

NE/E winds 10 kt or less today into tonight.

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

Slight prob for MVFR cigs during AM push, and low prob for PM
push. MVFR conds likely for Sun AM push. Isolated shra possible
for eve push.

NE winds of 7 to 10 kt, likely becoming E/SE in the afternoon
with hybrid sea breeze development, except NE for KLGA. MVFR
conds likely for Sun AM push.

OUTLOOK FOR 06Z SUNDAY THROUGH WEDNESDAY...

Late Tonight: MVFR. NE/E winds less than 10 kt.

Sunday...MVFR or lower in the AM, gradually improving to VFR.
Light E/NE winds.

Monday...MVFR AM, then VFR.

Tuesday-Wednesday...VFR.

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

&&

.MARINE...
Ocean seas east of Fire Island Inlet remain elevated, at 5 to 6
feet, with a east to southeast 8 second swell from weak low
pressure meandering south of Nova Scotia. The low weakens
further during Saturday. Seas have subsided across the central
ocean zone, and have cancelled the advisory there. The SCA
remains in effect for the eastern ocean zone until 10 am
Saturday. Then Saturday afternoon and Saturday night winds and
seas remain below advisory levels. On the non ocean waters winds
and seas remain below advisory levels tonight through Saturday
night.

A weak pressure gradient over the waters will lead to conditions
below SCA levels Sunday through the middle of next week.

&&

.HYDROLOGY...
There are no hydrologic issues through the middle of next week.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...Small Craft Advisory until 10 AM EDT this morning for ANZ350.

&&

$$

SYNOPSIS...DS/MET
NEAR TERM...DS/MET/DW
SHORT TERM...MET
LONG TERM...DS
AVIATION...NV
MARINE...DS/MET
HYDROLOGY...DS/MET