000
FXUS61 KOKX 051743
AFDOKX
Area Forecast Discussion
National Weather Service New York NY
143 PM EDT Fri Apr 5 2024
.SYNOPSIS...
Deep low pressure will slowly drift east from coastal Maine
today into the western Atlantic through the weekend. High
pressure builds over the region on Monday, shifting offshore
into Tuesday. A back door cold front may approach from the
northeast late Tuesday into Wednesday, before a frontal system
impacts the region from the west late next week.
&&
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
The forecast remains on track. Clouds have overspread the cwa
this aftn with shwrs upstream on radar. Large and strong
stacked low continues to spin over Maine, slowly filling, but
sending a series of shortwaves through the region over the next
48 hrs. Next shortwave, pivoting thru the eastern Great Lakes
will swing ese towards and thru the region this afternoon.
This regime will maintain cloudy skies, with scattered diurnal shower
development this afternoon. Boundary layer appears warm enough
areawide for plain rain for the coastal plain. Across interior
(particularly above 500 ft), some sleet, graupel or wet snow could
mix in with evaporative cooling in any isolated heavier shower
activity.
Weak instability into the mixed phase region, indicate a low and
isolated potential for tstm activity with pea size hail and gusty
winds to 40 mph. Highest probability across interior.
Cloud cover, cold pool aloft, diurnal shower activity and gusty NW
winds will make for unseasonably chilly conditions, with highs in
the mid 40s interior and around 50 coast (5 to 10 degrees below
seasonable).
&&
.SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/...
Good model agreement in deep stacked low over coastal Maine this
evening slowly filling and drifting east through the Gulf of Maine
on Saturday and into the open Atlantic on Sunday. Before the large
closed low finally exits on Monday, it will keep cyclonic flow
with two distinct shortwaves pivoting through the area Saturday
and Sunday aft, keeping unsettled and unseasonably cool
conditions over the area.
Drying conditions tonight in wake of shortwave, but close proximity
of stacked low will keep mid clouds persistent. Cloud cover and
mixed low-levels in breezy NW flow will actually keep temps near
seasonable.
Cloudy conditions and another round of isolated to scattered diurnal
shower activity likely late Sat AM into afternoon with shortwave
pivoting through (highest prob across NE zones). Mid levels
look slightly drier and mid-level inversion slightly lower than
today, which should result in relatively less shower activity.
Instability also looks to remain below mixed phase region,
limiting threat for isolated thunder. Low probability for some
sleet, graupel or wet snow to mix in across interior with any
isolated heavier shower activity.
Better potential for some partial clearing Sat Night in wake of
shortwave. Temps will remain near seasonable with mixed low-level,
but potential for some outlying areas to see a bit of radiational
cooling to near freezing.
Final distinct shortwave moves through on Sunday with cloudy
conditions, and potential for isolated shower activity (mainly east).
Decent agreement on cyclonic flow relenting Sunday night as closed
upper low slides offshore, and high pressure building in. Clearing
skies and good radiational cooling conditions across outlying
area expected Sunday Night with temps falling below freezing.
Near 40 for the NYC/NJ metro.
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...
Ridging aloft centered over the Eastern US will favor dry conditions
early to mid next week, before gradually shifting east into late
week. A 1020 mb surface high pressure sits over the region to start
the period. Clear skies likely to start Monday, though, as it
appears at the moment, a relatively thin veil of high clouds
will be advancing east during the afternoon Monday as a warm
front lifts toward the region from the south and west.
The center of the high slips off the Carolina coast Tuesday, with a
SW flow developing. Soundings indicate H85 temps should climb to
near +10C, and with mixing should allow for a seasonably warm
afternoon. Sea breezes may limit coastal temperatures a bit, but
highs should top the upper 60s or lower 70s away from this influence.
A strong shortwave diving south into the North Atlantic from
Maritime Canada may send a backdoor front through the region late
Tuesday or Wednesday, lowering temperatures midweek. Meanwhile,
the ridge in place locally is able to begin translating east,
ahead of the next trough approaching from the west that will
bring a return to rain chances by late next week.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
-- Changed Discussion --
Deep low pressure meanders along the New England coast into
Saturday.
VFR, except brief MVFR cigs possible at KSWF until early this
evening.
WNW gusts around 25 kt this afternoon, subsiding closer to 20 kt
this evening and returning back to around 25 kt shortly after
12-13z Sat. Winds will veer more NW-NNW by around 12z Sat.
...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty...
Gusts are more likely to prevail south/left of 310 magnetic
until around 03z, then north/right of it thereafter.
Gusts may be only occasional tonight.
OUTLOOK FOR 18Z SATURDAY THROUGH WEDNESDAY...
Saturday: VFR. NNW wind gusting around 25 kt.
Sunday: VFR.
Monday through Tuesday: VFR.
Wednesday: MVFR/IFR with rain and LLWS possible.
Detailed information, including hourly TAF wind component forecasts,
can be found at: https:/www.weather.gov/zny/n90-- End Changed Discussion --
&&
.MARINE...
Pressure gradient tightens this morning around deep low pressure over
the Gulf of Maine, likely producing marginal SCA NW wind gusts on
all waters this afternoon. Gusts likely subside just below SCA
tonight for nearshore, but may pick up to marginal SCA once
again during the day Sunday. Winds then likely weaken from w to
e all waters Sat Night into Sun Am.
On the ocean, 2-3 ft easterly swells gradually subside through
tonight. Otherwise, marginal SCA ocean seas, dominated by NW
wind waves will continue through Saturday.
Sub SCA conditions likely return from w to e late Sat Night into
Sunday AM. Relatively tranquil conditions Sunday Night into Monday
as high pressure builds over the waters. Sub-SCA conditions
persist through mid next week in a weak pressure regime.
&&
.HYDROLOGY...
Hydrologic impacts are not expected through Thursday.
&&
.TIDES/COASTAL FLOODING...
Water level expected to remain below minor flood thresholds through
Saturday morning high tides.
A new moon on Monday, April 8, with spring tides building in. There
is potential for localized minor flooding with the late Sat and
Sun AM high tides. Better chance of localized minor with Sun
and Mon PM spring tides, as tidal departures needed for minor
drop as low as 1/4 ft and Ekman effects from offshore low
increase water levels along the entire coast.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ331-
332-335-338-340-345.
Small Craft Advisory until 8 AM EDT Saturday for ANZ350-353-
355.
&&
$$
SYNOPSIS...DR/NV
NEAR TERM...JMC/DBR/NV
SHORT TERM...NV
LONG TERM...DR
AVIATION...JC
MARINE...DR/NV
HYDROLOGY...DR/NV
TIDES/COASTAL FLOODING...