929
FXUS61 KBUF 112334
AFDBUF

Area Forecast Discussion
National Weather Service Buffalo NY
734 PM EDT Tue Jun 11 2024

.SYNOPSIS...
Extensive cloud cover across the region will gradually erode through
this evening. High pressure will build across the region, bringing
dry weather which will last tonight through most of Thursday. A cold
front will bring another round of showers and scattered
thunderstorms Thursday night through a portion of Friday.

&&

.NEAR TERM /THROUGH WEDNESDAY NIGHT/...
Residual low level moisture will be tough to clear out tonight...as
high pressure with light winds and little mixing being partly
responsible for the lack of significant improvement. While some
areas will clear out for awhile...that may just lend itself to
some stratus redeveloping late.

Mid level clouds will then roll in from the west towards daybreak...
as a robust shortwave will take aim on the region from the Upper
Great Lakes.

While general high pressure will be over the region on Wednesday...
the aforementioned shortwave will move through with some mid level
clouds and possibly an isolated shower or two. Otherwise it will be
milder day with temperatures FINALLY returning to the 70s.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY/...
On Thursday our area will be situated within the deepening
southwesterly flow in between high pressure anchored off the east
coast...and a mid-level trough/associated area of low pressure
sliding across the Upper Lakes and central Ontario Province to
western Quebec. While the cold front associated with this system
will remain well to our west through the day...a weak leading
shortwave impulse and warm frontal segment out ahead of this system
will slide across our region. This may bring some widely scattered
showers/isolated thunderstorms during the afternoon...with the
greatest chances of these found across the counties bordering Lake
Ontario where the best combination of moisture...lift...and
instability will come into play. Outside of these the day will just
be dry...notably warmer...and increasingly breezy as the
southwesterly flow across our region ramps up. Highs will mostly
range in the lower to mid 80s...with the warmest readings (upper
80s) found near Dansville...and the coolest temps immediately
northeast of Lake Erie due to the stiffening southwesterly breeze
off that lake...which may gust to 30-35 mph at times.

Thursday night and very early Friday the core of the mid-level
trough and the attendant surface low will eject northeastward across
Quebec Province...while pivoting its trailing cold front across our
region. In the spatial and temporal senses the best overall chances
for any associated showers and embedded storms will lie near Lake
Ontario and across the North Country Thursday evening...with this
potential then fading through the rest of the night and with
increasing southeastward extent as instability wanes and the frontal
boundary becomes increasingly estranged from its departing mid-level
support. Otherwise...lows will largely be in the lower to mid 60s.

On Friday the main cold front will slide off to our southeast...
with high pressure and drier air building eastward into our region
in its wake. With the guidance continuing to trend toward the above
happening more quickly...any convection associated with the front
should be faster to exit our region during the morning...leaving
behind a largely dry afternoon. The one possible exception to this
will be across the North Country and Saint Lawrence Valley...where
the approach and passage of a secondary shortwave trough/weak cold
front could produce a few more widely scattered showers and storms
during the afternoon and early evening. Otherwise the cooler and
drier airmass building in behind the front will result in highs
ranging through the 70s.

The increasingly expansive surface ridge will then strengthen as it
builds across our region Friday night...bringing an end to any
spotty convection across the North Country and leading to a quiet
and tranquil night otherwise. With good radiational cooling
conditions in place...lows will settle back into the upper 40s
across the North Country and interior of the Southern Tier...and
into the lower to mid 50s elsewhere.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Upper level trough responsible for the cooler weather earlier this
week will exit the Northeast Saturday, while ridging will advance
and build east across the Great lakes Sunday through Tuesday. While
the ridge builds east across the region, a short wave trough will
ripple across the top of the ridge Monday.

Overall with the exiting trough followed by the ridge building east,
surface high pressure centered over the Great Lakes Saturday morning
will slide southeast towards the Atlantic Coast by Monday morning.
While this pattern will support dry weather throughout the weekend,
it will also support warm and moist Gulf of Mexico air to filter in
across the area supporting temperatures to surge above normal for
mid June.

The aforementioned shortwave trough rippling across the top of the
ridge across the Great Lakes, will support a surface low well to the
north across northern Ontario and Quebec. Extending southward from
the low will be a pair of fronts to slide east across the eastern
Great Lakes. This far out, timing and placement continues to be in
question and therefore have slight chance to low end chance for
showers and afternoon thunderstorms Monday afternoon through
Tuesday. Despite the frontal passages, temperatures will continue to
be above average.

&&

.AVIATION /00Z WEDNESDAY THROUGH SUNDAY/...
Most areas will experience VFR conditions tonight...but there will
be some lingering MVFR cigs near KROC...and later some MVFR/IFR fog
and stratus will likely redevelop over parts of the Srn Tier (ie.
KJHW).

VFR weather will then be found across the region on Wednesday.

Outlook...

Wednesday night and Thursday...VFR.
Thursday night and Friday...VFR/MVFR. Showers and thunderstorms
likely.
Friday night through Sunday...VFR.

&&

.MARINE...
High pressure will build across the Lower Great Lakes resulting in
light winds which will last through Wednesday night.

A cold front will then move across the Lower Great Lakes late
Thursday night and early Friday. Southwest winds will increase ahead
of the front Thursday, with winds remaining elevated through Friday.
This will bring choppy conditions to both lakes. High pressure will
then build back across the waters with light winds and generally
favorable boating conditions during the weekend.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...None.
MARINE...None.

&&

$$

SYNOPSIS...Apffel/Hitchcock
NEAR TERM...RSH
SHORT TERM...EAJ
LONG TERM...JJR
AVIATION...RSH
MARINE...Apffel