257
FXUS61 KOKX 290815
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
415 AM EDT Wed May 29 2024

.SYNOPSIS...
A cold front approaches today and passes through tonight with a weak
surface trough lingering nearby on Thursday. High pressure then builds
in Friday and Saturday then slowly weakens beginning on Sunday,
allowing a series of weak disturbances to approach from the west
on Monday and Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
With an upper trough axis swinging through the region tonight, a
cold front and weak low center approach us and pass through this
afternoon into tonight. The cold pool accompanying the falling
heights aloft will help create conditionally unstable mid level
lapse rates this afternoon into tonight, and SBCAPES increase to
around 500 J/kg during this time. These ingredients, combined with
moisture and the lift from the aforementioned features passing
through, result in showers eventually become likely everywhere by
the end of the night. Chances begin over western sections around
noon with chances increasing and spreading eastward as the afternoon
and evening progress. Shear profiles are not supportive of severe
weather, especially with the limited CAPE, but thunderstorms will be
possible. NBM was used for temperatures.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
The system should be just east of us, or at least exiting early
Thursday morning. A cyclonic flow aloft and surface trough will
however still be present during the rest of the day. Slight chance
to chance PoPs during the day. CAPE will be more limited, and can`t
completely rule out a thunderstorm, but will leave the mention of it
out for now. Highs mostly in the lower 70s.

The longwave pattern aloft amplifies Thursday night, sending another
trough axis our way. This axis will be over or just east of us by
late, with ridging following it for Friday. Moisture is limited, so
it looks like it will be a dry period. Highs around normal - in the
lower and middle 70s.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
High pressure sfc and aloft will dominate this weekend, while low
pressure remains well out to sea over the western Atlantic. A series
of weak upper level disturbances approaching from the west will
weaken the ridge in place, with timing and location in question.
ECMWF shears out a weakening lead mid level disturbance early next
week, with most of the forcing passing to the north on Sunday and a
lingering weak trough passing S on Mon. GFS remains more
consolidated presumably in response to a stronger and more
consolidated western Atlantic cutoff low, with an approaching
disturbance on Mon. Both models then show a second upper level
disturbance approaching on Tue. For now have remained dry Sunday and
Monday and have no more than 20-30 PoP on Tue.

Daytime temps through the period will run at least a few degrees
above normal. Lows will be near normal Sat night, then also moderate
to above normal especially by Sunday night as a S return flow
becomes established.

&&

.AVIATION /08Z WEDNESDAY THROUGH SUNDAY/...
One weak frontal boundary will move east of the area overnight.
Another will approach Wednesday afternoon and evening.

Sub VFR chances should increase going into this afternoon and
evening. Sct showers and possible tstms could begin perhaps as
early as 16Z-18Z KSWF, 18Z-20Z KEWR/KTEB/KHPN, 20Z
KLGA/KJFK/KBDR, 22Z KISP and by Wed night at KGON. These have
been handled with PROB30 for MVFR cond, but IFR vsby may be
possible in heavier cells.

Mostly light W-NW flow overnight should veer more to the NNW by
daybreak as one front moves farther to the east. Coastal sea
breezes develop in the afternoon at KJFK/KISP/KBDR/KGON, and
could reach KLGA by 22Z and KEWR/KTEB by 00Z.

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

No unscheduled AMD expected.

OUTLOOK FOR 06Z THURSDAY THROUGH SUNDAY...

Late tonight: Periods of MVFR cond with chance of showers.

Thursday: Chance of showers with MVFR cond possible, mainly in
the morning and mainly E of the NYC metros.

Friday through Sunday: VFR.

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

&&

.MARINE...
Sub-advisory conditions persist through the weekend with a
light flow, generally 10 kt or less.

&&

.HYDROLOGY...
No hydrologic impacts are expected through the forecast period.

&&

.TIDES/COASTAL FLOODING...
There is a moderate risk for rip current development today. The
moderate risk continues for Thursday for the southeast Suffolk
County ocean beaches, with a low risk elsewhere.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...None.

&&

$$

SYNOPSIS...JC/BG
NEAR TERM...JC
SHORT TERM...JC
LONG TERM...BG
AVIATION...BG
MARINE...JC/BG
HYDROLOGY...JC/BG
TIDES/COASTAL FLOODING...