621
FXUS61 KALY 070007
AFDALY

AREA FORECAST DISCUSSION
National Weather Service Albany NY
807 PM EDT Thu Jun 6 2024

.SYNOPSIS...
Scattered showers thunderstorms will end early tonight.
Any thunderstorm will produce heavy downpours. Initial morning sun
tomorrow fades behind increasing clouds as our closed low moves
overhead resulting in additional areas of showers and perhaps a few
thunderstorms. Even cooler, breezy, and mostly cloudy conditions
return for Saturday with some enhanced lake effect and scattered
diurnal driven rain showers.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
.UPDATE as of 725 pm EDT...Remnant meso-low continues to lift
northeast across the Lake George Region and southern Adirondacks
with a cold front moving across eastern NY. Latest SPC
mesonanalysis shows instability waning with the loss of diurnal
heating. One batch of showers and thunderstorms is exiting the
Berkshires with a secondary batch going into southern VT.
Lightning continues to diminish. Mainly showers with rainfall
rates of 0.50-1.0"/hour moving across the Saratoga and Lake
George Regions into the Champlain Valley. Some wind gusts 35 to
nearly 50 mph with the remnant MCV/vort to meso-low. Some
retooling of PoPs/WX to radar/latest CAMS. Locally heavy
rainfall is the biggest threat for a few more hours north and
east of ALY. Temps cool into the 60s to lower 70s in the rain. A
few showers may clip the southeast Catskills/mid Hudson Valley
and NW CT early this evening. Clearing to partly cloudy skies
expected in the wake of the front overnight. Lows will be in the
50s to around 60F.

.PREV DISCUSSION [0403 pm EDT]...

Most of the rain should be east of the region by 10-11pm. Winds
sharply shift to the west in the wake of the wind shift boundary
and should briefly become breezy with gusts up to 20kts
possible. Clouds quickly clear in the wake of the boundary
late this afternoon into the evening from west to east with dew
points dropping as dry air quickly ushers into the region.
Humidity levels drop with dew points and temperatures remaining in
the 50s to around 60. Patchy fog may develop given the clearing
clouds and afternoon rainfall but with drier air moving into
the region, only expecting patchy coverage.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/...
For Friday, our closed low finally pushes eastward towards
Eastern NY with the leading edge of the cold pool pushing into
the area by 15 UTC or so. Morning sun will fade behind
increasing clouds as the mid-level moisture spills overhead.
Scattered showers develop along the leading edge of the
intruding cold pool and mid-level moisture and sfc cold front
by 15 - 18 UTC for areas mainly north and west of the Capital
District. Forecast soundings show we will have a very shallow
boundary layer under the cold pool with equilibrium levels only
around 15kft or so. This will shrink our CAPE potential and lead
to very shallow low-level convection. Thus, we do expect any
severe weather but a few lightning strikes are likely as up to
around 500 J/kg of CAPE develop. Some small hail is also not
ruled out as wet-bulb zero heights drop under 10kft. Winds shift
to the northwest behind the leading edge of the cold in the
afternoon leading to slightly breezy conditions as wind becomes
sustained 10-15kts and gusts up to 20-25kts.

Scattered showers and possible storms spread south and east of
Albany by 21 UTC and expand into western New England as the cold
front shifts southeastward. Given the delayed onset of
showers/storms, temperatures here will have a better chance of
reaching into the low 80s. With dew points only in the 50s, it
will feel much less humid as well. Areas north/west of the
Capital District should be cooler only reaching into the low to
mid 70s with 60s in the southern Adirondacks.

Skies turn partly to mostly clear tomorrow night with areas
south of I-90 becoming mainly clear. With overnight lows
cooling into the low to mid 50s and dew points also dropping
into the 50s, it will feel much more comfortable Friday night.
The southern Adirondacks and southern Greens drop even cooler
into the 40s. With a westerly wind fetch continuing off the
lakes and cool air advection ongoing, some lake enhanced
showers likely generate off Lake Ontario into the western
Adirondacks. Maintained likely POPs in northern Herkimer County
and high end chance in northern Hamilton given this potential.
Some scattered lake enhanced showers may spill into the Upper
Hudson Valley and southern VT.

Our very broad upper level low remains straddled across
southern Canada into the Great Lakes for Saturday. As the
initial shortwave trough rotating around the low exits into the
Canadian Maritimes, subsidence in its wake builds over much of
the Northeast. While this reduces forcing for ascent aloft, the
cold pool remains overhead and will support diurnally driven
showers, especially north of I-90 closer to the cold pool.
Westerly flow remains strong throughout the column which will
support a continued fetch off the lakes and generate lake
enhanced showers off Lake Ontario that extend into the Upper
Hudson Valley at times. The cold pool will also support mostly
cloudy skies and cooler temperatures that struggle to rise out
of the low to mid 70s for much of the area. A tight pressure
gradient in the wake of Friday`s cold front will also keep
west to northwesterly winds rather breezy on Saturday. Sustained
winds range 10 to 15kts and gusts up to 25-30kts, strongest
winds will likely be down the Mohawk Valley, Capital District
into western New England thanks to channeled flow. The breezy
winds will make it feel even cooler on Saturday. The cold pool
aloft will keep chance POPs in play (especially north of I -90)
thanks to isolated to scattered diurnally driven showers
developing. Areas south of the interstate should have drier
conditions with the mid-Hudson Valley and NW CT mainly dry.
Thunderstorms appear unlikely.

The first half of Saturday night starts dry as we lose daytime
heating with temperatures cooling into the 50s once again.
Clouds quickly increase after Midnight as a potent shortwave
trough rotating around our parent closed low and attendant sfc
cold front tracks south and eastward through eastern NY towards
western New England. Another area of rain likely develops in
Western and Central NY and overspreads into areas west of the
Hudson River before sunrise. Given ongoing uncertainty on exact
timing and coverage, we have widespread chance POPS throughout
the region from 06 - 12 UTC Sunday but may trim it back to focus
on western areas in future updates.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
Long term period begins at 12z Sunday with the broad upper low
located in southeastern Canada. An upper shortwave will rotate
around the periphery of the upper low Sunday, bringing increased
chances for showers and perhaps a few rumbles of thunder, especially
in the afternoon. An associated weak cold frontal boundary will also
help to increase coverage of showers during the afternoon. Coverage
of showers should diminish overnight with the loss of daytime
heating. Highs will be mainly in the 60s (high terrain) to 70s
(valleys) with overnight lows in the 40s (terrain) to 50s (valleys).

Monday, the upper low pulls away further to the east, although a
piece of the upper low will break off and linger over our region as
an upper trough. This will result in continued chances for a few
afternoon showers and perhaps a rumble of thunder, although coverage
of showers and storms will be less than on Sunday. Temperatures will
be similar to those on Sunday for both daytime highs and overnight
lows.

Tuesday through Thursday...Upper ridging builds overhead Tuesday as
the upper low finally departs from our region. This should result in
a much drier day Tuesday, although a rogue afternoon showers till
can`t completely be ruled out especially if the upper low is a
little slower to depart than currently expected. Forecast confidence
decreases for the Wednesday into Thursday timeframe, as most sources
of guidance keeps us dry through Wednesday, although upper troughing
will be approaching from the west and could bring increased chances
for showers Wednesday night or Thursday. We will continue to refine
the forecast in the coming days as we get a better handle on the
timing and evolution of this approaching trough. Temperatures
Tuesday will be a couple degrees warmer than on Monday. Wednesday,
temperatures may climb to around 80 for valley areas, with mid 80s
possible Thursday. Overnight lows also trend warmer, from 40s to 50s
Tuesday night to 50s to around 60s for Wednesday and Thursday nights.

&&

.AVIATION /00Z FRIDAY THROUGH TUESDAY/...
Through 00Z Saturday...A low pressure system continues to move
across northern NY early this evening with a cold front
approaching eastern NY and western New England. Scattered
showers and thunderstorms are ongoing and will be ending
between 00Z and 02Z/FRI over KGFL and KPSF. Conditions have
briefly lowered to IFR/MVFR with these thunderstorms. Additional
showers ahead of the cold front may briefly impact KPOU prior
to 02Z/FRI.

The skies may briefly clear or become mostly clear between
02Z-06Z/FRI with sct- bkn mid level clouds and sct-bkn high
clouds. With light winds ahead of the cold front and recently
wet ground at KPOU/KPSF and possibly KGFL some patchy IFR/MVFR
mist may form between 06Z-11Z/FRI. We kept KALB MVFR with mist.
If the clouds remain more prevalent in coverage, then the
mist/fog will not form.

A secondary cold front and the upper level low will bring an
increase in clouds with scattered showers in the late morning
into the early afternoon tomorrow. We increased mid level clouds
at the TAF sites with sct-bkn stratocumulus 3.5-5 kft AGL by
the late morning into the afternoon. We included PROB30 groups
at all the TAF sites for showers in the 18Z-23Z/FRI timeframe.
Vsbys may briefly lower to MVFR with cigs hovering near high
MVFR levels.

The winds will be southwest to west at 5-12 KT early this
evening with some gusts 20 KT or slightly stronger near the
heavier showers. The winds will become light and variable in
direction at 3 KT or less or calm shortly before or just after
midnight. The winds will increase from the southwest to west at
7-12 KT in the late morning into the afternoon.

Outlook...

Friday Night: Low Operational Impact. Slight Chance of SHRA...TSRA.
Saturday: Low Operational Impact. Breezy. Isolated SHRA.
Saturday Night: Moderate Operational Impact. Scattered SHRA.
Sunday: Moderate Operational Impact. Breezy. Chance of SHRA...TSRA.
Sunday Night: No Operational Impact. NO SIG WX.
Monday: Moderate Operational Impact. Chance of SHRA.
Monday Night: No Operational Impact. NO SIG WX.
Tuesday: Low Operational Impact. Slight Chance of SHRA.

&&

.HYDROLOGY...
Showers and thunderstorms through early evening will result in
rainfall amounts ranging from 0.50 to 1.50 inch with localized
amounts up to 2 inches. Given the moisture rich environment, some
thunderstorms will produce heavy downpours and high rainfall
rates leading to localized ponding of water on roadways, urban
and small stream flooding and standing water in low lying areas.

No flooding of main stem rivers is expected. Additional showers
and thunderstorms will occur tomorrow but less widespread
coverage and lighter rates expected. Additional amounts of
perhaps up to a half inch of rain through the weekend.

&&

.ALY WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
MA...None.
VT...None.

&&

$$

SYNOPSIS...Speciale/Wasula
NEAR TERM...Speciale/Wasula
SHORT TERM...Speciale
LONG TERM...Main
AVIATION...Wasula
HYDROLOGY...NAS/Speciale