056
FXUS61 KOKX 230600
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
200 AM EDT Sun Jun 23 2024

.SYNOPSIS...
A stationary boundary stays north of the area through tonight, and
then should begin to lift further north Sunday. A cold front
approaches Sunday night and moves through early Monday with high
pressure to follow into Tuesday. A cold front passes through
late Wednesday night into Thursday. High pressure will then
return for Thursday night into Friday.

&&

.NEAR TERM /THROUGH TONIGHT/...
Added some patchy fog for ern areas as well as the river
valleys. No other major changes attm. Isold-sct showers and
thunderstorms will be around tngt with instability and anomalous
humidity in place. Frontal boundary stays locked up north of
the area, but close enough to have some forcing impacts,
especially across northernmost and northeastern portions of the
area. CAMs have had some inconsistencies around whether
convection lingers or re-fires up during a portion of the night.
Bulk shear should be no more 25-30 kt so not conducive to
organized convection, however with multiple weak boundaries
around and a very humid air mass where it does not take much to
initiate or re-fire and some interaction with any outflow could
keep thing going some. It will be a rather warm and muggy night.
Also, like last night where rain occurs causing a wet ground
there very well may be patches of fog in places. Don`t have this
in the forecast as synoptic flow may be a bit stronger than the
previous night and may preclude this, but this will need to be
monitored.

Lows overnight remain well above normal with dew point readings
hovering around 70.  Therefore no meaningful relief tonight as lows
will range from around 70 across a few interior and eastern coastal
sections, to the upper 70s across the NYC and portions of the NE NJ
metro.

&&

.SHORT TERM /MONDAY THROUGH MONDAY NIGHT/...
The region should get even more into the warm sector on Sunday as
the warm front lifts further to the north. In terms of this stretch
of heat and humidity, this should be the most uncomfortable day
widespread across the area. Therefore continue heat headlines for
one more day, and added So. Nassau, So. New Haven, and So
Middlesex as temps just away from the immediate shore should be
able to reach 95 heat index criteria for 2 consecutive days
this weekend, thus the northern portions of these southern zones
are close enough to warrant the advisory. Only far eastern
coastal sections look to remain just below heat adv criteria on
Sunday.

The chances for more widespread and more organized convection
increase into Sunday afternoon and evening despite the fact that
storm coverage with convective allowing models isn`t all that
impressive. There should be better priming of the overall
environment as height falls in increase for the afternoon and
evening. The winds increase aloft, thus better bulk shear should
lead to more organized convection with the primary threat from any
storms being strong damaging wind gusts, with hail and an isolated
tornado possible but on the lower end of the threat scale. Storm
mode will likely be multicell, with a more linear / broken linear
mode possible into the evening as forcing increases. A mixed mode of
cluster / supercell cannot be ruled out further north across the
CWA. Hodograph curvature carves out more storm relative helicity
further north on Sunday. SPC has a Slight risk of severe storms for
a little more than half the area, with a marginal risk further
southeast across the area. Heavy downpours and lightning will be a
concern as well with any storms. With the faster flow aloft storms
should move along as any localized flash flood threat would be more
from repeat / training storms as individual cells should move faster
compared to the previous day. With the very high moisture
environment with PWATs likely just above 2 inches for much of the
area and a warm cloud layer easily above 11 kft instantaneous
rainfall rates could be rather high, and a potential issue for the
more urban environments in terms of localized flash flooding.
Overall the flash flood threat coverage wise appears limited due to
the faster nature of the storms, but one or two isolated cases
remain a concern. For more on potential hydrologic impacts see the
Hydrology section.

There is still a good deal of uncertainty for the overnight late
Sunday night into early Monday morning. There will be a pre-frontal
trough lingering which may serve as a focus for additional
convection towards the middle of the night. How much any previous
convection has worked over the storm environment will be the
determinant as to how much convection can occur during the night.
Getting towards early Monday morning the cold front starts to work
into western portions of the area.  With the humid airmass still in
place look for widespread 70s for the low temperatures.

During the day Monday with the cold front getting to the east by mid
to late morning look for a drier N to NW flow. There should still be
a fair amount of cumulus as the cooler air aloft should be in place
with the upper level trough axis lagging behind a bit. Dew point
readings towards afternoon should get into the lower 60s, and may
even lower a bit more into the upper 50s or thereabout with
potentially more mixing due to downsloping. It will still be a very
warm day, just not as oppressive and heat headlines not anticipated.
With the upper level trough axis still lagging behind low end chance
PoPs seems prudent with a shower or thundershower possibility
through the afternoon. Temperatures in most places should top out
well into the 80s in most places due to a land based wind trajectory
out of the W and NW.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
Key Points:

* Temperatures will remain near to just above normal for much of the
  extended period.

* A slow moving frontal system could bring locally heavy rainfall
  from late day Wednesday into Thursday.

There has not been much change to the thinking with the extended
forecast for this update, and followed the National Blend of Models
closely. Shortwave ridging on Tuesday gives way to a more zonal flow
by Wednesday into Thursday.  A shortwave trough passes north of the
area on Thursday followed by weak ridging again into next weekend.
Much of the week looks to remain dry, save for a frontal system that
approaches from the west late Wednesday night into Thursday. Modeled
PWATS of close to 2" along with a weak steering flow aloft would
increase the chances of excessive rainfall for the area as the front
passes through the area. Model thermodynamic profiles also look
favorable for thunderstorm development; though this may be somewhat
limited given the nighttime approach of the system. The front passes
Thursday, with a return to drier conditions under high pressure and
westerly flow to end the week.

High temperatures on Wednesday look to be near 90F across the urban
corridor of NYC and NJ and upper 80s elsewhere. With dewpoints in
the mid to upper 60s, this will yield heat indices in the mid to
upper 90s across the hottest locations.  Thereafter, the front
passes through and Thursday/Friday are a bit cooler, but still above
average, in the mid to upper 80s.

Dry weather returns Friday as another high builds into the region.

&&

.AVIATION /06Z SUNDAY THROUGH THURSDAY/...
High pressure remains across the Western Atlantic as a nearly
stationary front lingers north of the region. The front moves
north as a warm front this morning as low pressure passes to the
north today. An associated cold front moves into the area late
Sunday night.

Mainly VFR, with IFR to LIFR with stratus and fog across the
terminals east of New York City. Conditions improve to VFR 12Z
to 14Z. Also, a few showers were scattered mainly to the north
of the NYC terminals, and restrictions are not expected. Another
round of showers and thunderstorms are expected this afternoon,
some of which could produce heavy rainfall and gusty winds. Have
not included the wind gusts, and heavy rainfall, at this time
with timing uncertainties.

Winds light and variable to light southerly overnight, become
southerly at all the terminals with speeds increasing to
10-15kt, with gusts 25-30kt by midday. There may be an
occasional higher gust near the coast. Strong and gusty winds
will be possible in and near tstms.


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

Timing of convection on Sunday could be off by a couple hours.

MVFR or lower conditions possible early Sunday AM if low stratus or
fog is able to develop.

OUTLOOK FOR 06Z MONDAY THROUGH THURSDAY...

Late Sunday night: Showers and thunderstorms likely with MVFR
conditions east of the NYC terminals until late then becoming
VFR. VFR at the NYC terminals and west. S/SW winds shift to W
with gusts to around 20kt.

Monday: MVFR with a chance of showers and thunderstorms.

Tuesday: VFR.

Wednesday: Mainly VFR. A chance of showers and thunderstorms in the
afternoon and at night, with MVFR or lower possible.

Thursday: MVFR or lower possible early.

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

&&

.MARINE...
SCA on the ocean tngt for seas, and blw criteria elsewhere.
By early afternoon Sunday small craft conditions begin to
develop for a good portion of the near-shore waters, with
perhaps the exception of NY Harbor with gusts 25, to even 30 kts
further east. Ocean seas approach 8 ft late Sunday and Sunday
night. A cold front approaches Monday night with gusts falling
below small craft criteria on the nearshore waters, but seas and
gusts slower to subside on the ocean waters. Towards late
Monday afternoon and evening seas should eventually subside
enough for sub small craft conditions to return to the ocean
waters.

Winds and seas across all the waters remain below advisory levels
Tuesday and Tuesday night. Increasing southerly winds on Wednesday
and Wednesday night will allow for conditions on the oceans to
approach SCA conditions.

&&

.HYDROLOGY...
WPC has a marginal risk of excessive rainfall for most of the area,
with a Slight risk across a good portion of CT into this evening. A
marginal risk will continue for mainly north and northwest interior
portions of the area for Sunday and Sunday night. With a very humid
airmass in place any stronger storms could produce heavy rain with
isolated local instances of up to a few inches possible in a short
time.

There is a chance for locally heavy rain from late day Wednesday
afternoon into Wednesday night with a front moving through the
region.

&&

.TIDES/COASTAL FLOODING...
There will be a high rip current risk for both Sunday and Monday for
all ocean beaches with higher wave energy approaching the shoreline
with a S to SW wind wave on Sunday. The winds becoming more offshore
on Monday, but with the high risk continuing.

&&

.CLIMATE...
Here are current record high temperatures for Sunday...

Sunday, June 23

NYC: 96(1888)
LGA: 95(1965)
JFK: 94(2010)
EWR: 97(1965)
ISP: 91(1999)
BDR: 91(2010)

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT this evening for CTZ005>011.
NY...Heat Advisory until 8 PM EDT this evening for NYZ067>075-078-
     176>179.
     High Risk for Rip Currents from 6 AM EDT this morning through
     Monday evening for NYZ075-080-081-178-179.
NJ...Heat Advisory until 8 PM EDT this evening for NJZ002-004-006-
     103>108.
MARINE...Small Craft Advisory from noon today to midnight EDT tonight
     for ANZ331-332-335-340-345.
     Small Craft Advisory until 6 AM EDT Monday for ANZ350-353-355.

&&

$$

SYNOPSIS...JE/DBR
NEAR TERM...JMC/JE
SHORT TERM...JE
LONG TERM...DBR
AVIATION...MET
MARINE...JMC/JE/DBR
HYDROLOGY...JE/DBR
TIDES/COASTAL FLOODING...
CLIMATE...