027
FXUS61 KOKX 050823
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
423 AM EDT Sun May 5 2024

.SYNOPSIS...
High pressure along the New England coast weakens locally as it
shifts farther offshore today ahead of an approaching cold front
from the west. The front eventually tracks through the region late
Monday, stalling to our south. High pressure then briefly returns
before the stalled boundary returns as a warm front Tuesday night.
A series of low pressure centers then impact the weather from
Wednesday through Saturday.

&&

.NEAR TERM /THROUGH TONIGHT/...
A rather unsettled close to the weekend with rain, clouds, and
cooler than typical conditions for early May. Stubborn amplified
ridging aloft over the Eastern US begins to break down today as a
shortwave swings east through the Great Lakes and into southeast
Canada. A weak area of low pressure associated with a shortwave
running into and over the ridge passes well to the northwest through
the Upper Great Lakes. This will help push a frontal boundary toward
the region, though will take plenty of time getting here. Ahead of
it, surface high pressure centered near the Canadian Maritimes will
maintain onshore flow as it begins to shift farther out into the
western Atlantic.

Bit of light rain around early this morning, mainly across the Lower
Hudson Valley and SW CT, though a lull in this activity develops
later this morning as a weak lift axis shifts north. More organized
shower activity moves through the region this afternoon as the
shortwave axis translates east over the shunted ridge. Timing for
this rain looks to begin for western areas by lunchtime, spreading
east into CT and Long Island by mid afternoon, then continuing
intermittently into the evening before tapering from west to east
overnight. QPF will be relatively light, generally ranging from
a quarter to a half inch, and no hydro issues are anticipated.

Look for areas of fog development tonight in the weak onshore flow
and saturated low levels from the residual moisture. May be locally
dense in spots, and will need to monitor this evening should any
potential headlines be needed into the AM commute.

With the rain, clouds, and return flow temperatures run 10 to 15
degrees below normal today, with afternoon highs in the 50s. These
temperatures likely remain steady overnight, or even rise a few
degrees toward Monday AM.

&&

.SHORT TERM /MONDAY THROUGH TUESDAY/...
Lingering showers should largely come to an end for eastern areas in
the morning hours on Monday, with fog likely hanging around elsewhere
before burning off by mid to late morning. Temperatures jump 20
degrees for some compared to Sunday as SW flow helps to advect in
some milder air, rebounding into the 70s across the interior
and areas away from maritime influence.

Can`t rule out a few pop up showers in the afternoon ahead of the
trailing cold front, but coverage appears limited on CAMs at this
point with decreased moisture. The front finally moves through
Monday night and stalls over the Mid-Atlantic on Tuesday. The
boundary eventually lifts back north as a warm front, but before
this, ridging returns, along with weak surface high pressure.
This should set up the driest day of the week so far on Tuesday,
with drier air working in. Another mild afternoon with downsloping
helping the interior and areas away from the coast to warm into
the mid to upper 70s. Night will remain mild, generally in the
50s, with lower 60s in the urban metro.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
Models over the past 24 hours have trended farther south and
slightly stronger regarding an area of low pressure tracking through
the Great Lakes Region and heading towards us Tuesday night into
Wednesday. There is therefore more confidence that an associated
warm front advances through a good portion of the forecast area
during Wednesday before a trailing cold front sinks south through
here Wednesday night. Shower chances increase Tuesday night with the
best chances occurring through the day Wednesday and generally higher
across the northern zones, which will be closer to the low center.
More instability is now anticipated - being in the warm sector.
Thunderstorms will therefore be possible during Wednesday, and given
potential shear profiles, steepening mid-level lapse rates with a
bit of a cold pool aloft, and CAPE aloft, will need to monitor
trends for the potential of strong wind gusts and small hail. NBM
was used for high temps, which are now expected to reach the lower
80s for NE NJ and parts of the Lower Hudson Valley and city. Mainly
70s for most of the rest of the forecast area.

The cold front stalls not too far to our south Wednesday night and
remains to our south while another wave of low pressure from the
Great Lakes Region approaches. Looks like an occlusion may occur as
a weak secondary low forms along the stalled boundary to our south,
resulting in a broad area of low pressure shifting through during
late Thursday night into Friday. Potential remains for yet another
wave of low pressure to pass nearby the area Friday night into
Saturday. There will be at least some chance of showers for each
period from Wednesday night through Saturday night. The highest
chances appear to be Thursday afternoon into night, but might linger
into Friday morning as well. NBM looked good for temperatures
through the period.

&&

.AVIATION /08Z SUNDAY THROUGH THURSDAY/...
High pressure weakens today as a frontal system slowly approaches
from the west.

Cigs lowering to IFR in the next hour or two, likely remaining IFR
through the TAF period. A shower or two possible this morning
without VSBY restrictions, but showers become more likely this
afternoon, then remaining likely well into tonight.

ESE-SE winds around 10kt or less through this evening, shifting
more southerly late tonight.

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

Timing of IFR onset may delayed by an hour or two. Chance that MVFR
cigs develop for a few hours this afternoon.

OUTLOOK FOR 06Z MONDAY THROUGH THURSDAY...

Sunday night: IFR with showers ending.

Monday: IFR to MVFR in the morning, then MVFR, becoming VFR in
the afternoon. A slight chance of showers, an isolated
thunderstorm possible.

Tuesday: VFR, becoming MVFR to IFR late at night.

Wednesday: MVFR or lower with a chance of showers. Thunderstorms
possible mainly in the afternoon.

Thursday: Mainly MVFR. Showers likely, mainly in the afternoon.

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

&&

.MARINE...
Winds and seas are expected to remain below SCA conditions through
Thursday, but ocean seas may rise to 5 ft Thursday night.

&&

.HYDROLOGY...
There are currently no hydrologic concerns through this week.

&&

.TIDES/COASTAL FLOODING...
Astronomical tides will increase with the approach of a new moon
Tuesday night along with the threat of minor coastal flooding each
night through this period and possibly including Wednesday night as
well.

Coastal flood statements may be needed for coastal Fairfield,
southern Westchester, and southern Nassau counties tonight.
Advisories may eventually be needed for these zones and Southern
Queens Monday night, and even more so for Tuesday night. Statements
may be needed during this period for other parts along western LI
Sound as well as lower NY Harbor.

&&

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

&&

$$

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