948
FXUS61 KOKX 011502
AFDOKX
Area Forecast Discussion
National Weather Service New York NY
1102 AM EDT Wed May 1 2024
.SYNOPSIS...
A weak frontal wave continues pushing offshore early this
morning with high pressure returning this afternoon into
tonight. Another weak frontal system passes across the area
Thursday, followed by high pressure Friday into early Saturday.
A weak frontal system approaches Saturday and passes through
late in the weekend or early next week. A warm front approaches
late Tuesday.
&&
.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
Much of the fog has burned off. The one exception is southern
portions of the Lower Hudson Valley. The fog will continue to
burn off in this area, and should completely burn off before
noon. Otherwise, forecast is on track.
A progressive and flat ridge will slide across New England
today with weak high pressure at the surface. Lingering clouds
this morning should give way to some sunshine, especially late
morning into the afternoon. Light NE flow to begin the day
should give way to a SE flow in the afternoon. There are hints
in some of the guidance for a passing shower in the afternoon
across interior CT. Feel this may be overdone, but did keep a
bit more cloud cover in this part of the region. Temperatures
are bit of a challenge again, but the usual warmer locations in
NE NJ, Lower Hudson Valley, and parts of NYC should be able to
reach the middle to upper 70s. Onshore flow should keep
locations further east a bit lower with highs in the middle to
upper 60s.
Some low clouds make a return tonight leading to mostly cloudy
conditions. The ridge axis slides to the east overnight with
another shortwave beginning to swing across northern New
England towards Thursday morning. Lows range from the middle to
upper 40s across Long Island and southeast Connecticut to lower
50s from the NYC metro on NW.-- End Changed Discussion --
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
The shortwave moving across northern New England will send a
weak frontal wave across the region on Thursday. The energy and
lift from the shortwave passes to our north and east, so not
anticipating any showers. The main forecast challenge on
Thursday will be with high temperatures and the timing of a wind
shift associated with the frontal wave. The faster guidance
would allow the winds to become more westerly in the afternoon,
especially away from the immediate coast, giving temperatures a
boost.
The NBM deterministic and statistical guidance are once again
running at or below the 25th percentile of the NBM for highs
on Thursday. The NBM deterministic and statistical guidance
have verified too cool recently, especially in regimes where
there is a deeper mixing and a westerly downslope component to
the wind. Think this is another good case to blend in some of
the warmer values in the 50th percentile of the NBM for
locations away from the immediate coast. While the air mass is
not as warm as Monday, using the 50th percentile of the NBM
verified well. Forecast highs on Thursday are in the lower to
middle 80s across the Lower Hudson Valley, NE NJ, and much of
the NYC metro. Further east, highs are in the upper 60s to
middle 70s. The 75th percentile of the NBM is depicting even
warmer highs in the upper 80s for some of the warmer spots.
These are possible if the flow goes westerly several hours
sooner. Warmer conditions may also occur over Long Island and
southern CT if the flow ends up more westerly than anticipated
in the afternoon.
High pressure builds across New England Thursday night and
should remain in control through Friday night. There is some
uncertainty regarding any stratus development for Thursday night
into Friday morning as an ENE flow off develops. Will go with
increasing clouds, but keep the forecast mostly cloudy for now.
At least partial clearing is expected Friday afternoon, but this
will be short-lived as clouds begin increasing again from west
to east Friday night ahead of the next frontal system and
shortwave energy. Temperatures Friday should end up close to
seasonable levels.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
An upper level ridge builds over the area on Saturday as high
pressure continues to nose down from our northeast. A weak
frontal system approaches from the west and continues to weaken
as it runs into the high. This creates a bit of a tricky PoP
forecast for Saturday, but continued previous thinking of
keeping much of Saturday dry as the upper level ridge axis
doesn`t pass through until Saturday evening. Slight chance to
chance PoPs Saturday afternoon for western locations, with
increasing PoPs through the night, becoming likely after
midnight. PoPs then continue through Sunday night. There are
some hints from the latest guidance of increased convergence
from an inverted trough/strengthening low as the system moves
through Sunday evening. This would bring a period of some
heavier rain to the area. Current NBM probabilities of seeing 1
inch or more with this event are 20 to 15 percent from west to
east, with the 90th percentile PQPF over 48 hours showing 1.5 to
1 inch from west to east.
Dry conditions are expected by early Monday morning. Brief, weak
high pressure builds in, with a weak cold front/surface trough
potentially passing through Monday evening. Heights rise aloft
slightly on Monday and expecting mostly sunny skies. This combined
with a light westerly flow should lead to some above normal
temperatures Monday. Went closer to the NBM 50th percentile as the
deterministic was closer to the 25th percentile. This gives
widespread low to mid 70s across the area.
A warm front approaches the area late Tuesday. There remains
uncertainty as to whether the warm front will remain nearby or
lift to the north late Tuesday and will thus affect
temperatures across the area. Mid level energy from the west
will attempt to break down any riding in the mid levels.
&&
.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
-- Changed Discussion --
Weak high pressure remains in control today. Weak low pressure
approaches from the north and west tonight.
Most of the terminals have become VFR with the exception of
KHPN, KBDR, and KGON. Expect all but KGON to become VFR in the
next 1-2 hours. KGON is forecast to take a bit longer and there
is a chance it remains MVFR.
Winds will be a light and variable to start becomes S with sea
breezes this afternoon, around 10KT.
MVFR or lower conditions return tonight, with eastern terminals
lowering first. KGON, KISP and KBDR likely go IFR. Less
confidence in IFR for other terminals. Flow remains out of the
south overnight, under 10KT.
VFR returns from west to east Thursday morning.
...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...
Higher confidence in a return of MVFR or lower tonight for KJFK
and KLGA.
OUTLOOK FOR 12Z THURSDAY THROUGH SUNDAY...
Thursday: Lingering MVFR or lower in the morning for eastern
terminals, then VFR everywhere. Some W gusts around 15-20KT
in the afternoon.
Friday: VFR.
Saturday: Mainly VFR. Chance of showers and MVFR cond in the
afternoon, becoming likely overnight.
Sunday...Chance of MVFR or lower in showers. ESE winds G15-20kt.
Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90-- End Changed Discussion --
&&
.MARINE...
A weak pressure gradient remains in place, with an extended
period of conditions below SCA levels through early next week.
Seas may reach 3-4 feet late Sunday into Monday with a weak frontal
system moving through.
&&
.HYDROLOGY...
There are currently no hydrologic concerns through early next
week.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...None.
&&
$$
SYNOPSIS...DS/JT
NEAR TERM...JP/DS
SHORT TERM...DS
LONG TERM...JT
AVIATION...JT/DW
MARINE...DS/JT
HYDROLOGY...DS/JT