333
FXUS61 KBUF 120727
AFDBUF

Area Forecast Discussion
National Weather Service Buffalo NY
327 AM EDT Sat Jul 12 2025

.SYNOPSIS...
A few showers and storms will be possible overnight across western
New York. Hot and humid today, with a chance of a few afternoon
showers or a thunderstorm during peak heating. A cold front will
near the region on Sunday with widespread showers and thunderstorms,
some of which could produce strong gusty winds and locally heavy
rainfall. Drier weather returns Monday, with somewhat cooler
temperatures and less humidity.

&&

.NEAR TERM /THROUGH TONIGHT/...
Convection over Lk Erie will impact the area shortly after 06Z and
then move east and weaken. After that...mainly dry weather will
resume as we head into and through the morning hours. After some
cloudiness early on, skies will begin to break and the heat and
humidity will build this afternoon. We should see mercury readings
reach the mid-upper 80s with low 90s in the Genesee Valley and the
lake plains south of Lake Ontario. Dewpoints are forecast in the
upper 60s to near 70F. This will result in heat indices in the
mid to upper 90s along the lake plains, Genesee Valley, and
northern Finger Lakes. Heat advisories have been hoisted for
these areas. That said...there is one other thing to watch as
the heat builds this afternoon, CAMs show convection firing up
again just east of the Genesee Valley and Finger Lakes region
after 21Z. It`s likely associated with the convectively enhanced
shortwave energy working over the top of the mid-level ridge. Have
nudged NBM PoPs up a bit to reflect this potential.

Otherwise...muggy and mild tonight ahead of the approaching trough
and cold front. There will be a continued chance of showers or a
thunderstorm. Air conditioner will definitely be cranking as temps
will `not` drop very far, with many locales in the low 70s.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
A closed low over James Bay Sunday morning will lift northward while
an upper level trough moves into the eastern Great Lakes region
through Sunday night. A southwest flow between the approaching
trough and an exiting upper level ridge will provide a corridor of
deep moisture across the forecast area Sunday into Sunday night. A
slow moving cold front will approach the forecast area during the
day. Daytime heating and deep moisture with dewpoints in the low 70s
will result in skinny CAPE across the region. Showers and
thunderstorms will develop ahead of the front, with a focused area
of convection ahead of a pre-frontal trough east of the Genesee
River. Forecast PWATS of 2"+ and mean RH% of 75%+ support heavy
rainfall in any convection. 3-hr flash flood guidance 2-2.5" across
the northern Finger Lakes region which may lead to localized flash
flooding if training storms develop. This is aligned with the Day 2
WPC Marginal/Slight Risk for Excessive Rainfall. The wind field is
weak, however there is an uptick in westerly flow to the north which
may help storms further north move but also increase the severe
potential. While there is greater uncertainty in the severe weather
potential, an unstable, moist environment may produce an isolated
downburst. This is aligned with the Day 2 SPC Marginal Risk for most
of the forecast area.

The front will move across the forecast area Sunday night. The
chance for showers and thunderstorms will diminish from west to
east, with heavy rainfall remaining possible across the northern
Finger Lakes into north-central NY Sunday night. Little wind behind
the front may result in fog development for locations that recorded
rainfall and clear out overnight. The main axis of moisture will be
east of the forecast area Monday. Little cold air advection behind
the front, so still warm but less humid Monday. Dry weather will
continue through Monday night.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
Upper level heights will build across the Northeast Tuesday through
Tuesday night. Surface high pressure over the Ohio Valley should
keep us relatively quiet, however warm weather is expected.
Uncertainty increases mid-week as an energetic northern stream moves
south towards the Great Lakes region. Wednesday looks to be a
transition day as the pattern becomes more active heading into the
weekend. Very warm and humid weather is anticipated, with showers
and thunderstorms at times.

&&

.AVIATION /08Z SATURDAY THROUGH WEDNESDAY/...
Convection over Lk Erie will potentially bring about brief lower
vsbys and cigs to KJHW, KBUF, and KIAG through 08Z. After that...VFR
will resume at all terminals as we head into the early morning
hours. Additionally...there is a `low` potential for some patchy fog
across southeastern Cattaraugus and southern Allegany counties,
which if it forms will dissipate after sunrise.

VFR for much of the daytime hours, as the heat builds there will be
a renewed chance for a few showers or thunderstorms this afternoon
into the early evening, especially from the Finger Lakes eastward.
Any heavier shower or thunderstorm will again have the possibility
of producing a localized brief period of IFR or below conditions.

Outlook...

Sunday and Sunday night...Showers and thunderstorms likely with
restrictions possible.

Monday and Tuesday...VFR.

Wednesday...Mainly VFR. A chance of a shower or thunderstorm.

&&

.MARINE...
Light winds and minimal wave action today, there will be a chance of
an isolated shower or thunderstorm. A slow moving cold front will
bring increasing chances of showers and thunderstorms Sunday through
Sunday night. Winds pick up a bit ahead and with the front but
remain well below any headline criteria.

Winds remain fairly light Sunday night behind the front through
Tuesday as high pressure builds in across the lakes.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...Heat Advisory from noon today to 7 PM EDT this evening for
     NYZ001>006-010-011-013-014.
MARINE...None.

&&

$$

SYNOPSIS...AR
NEAR TERM...AR
SHORT TERM...HSK
LONG TERM...HSK
AVIATION...AR
MARINE...AR