Text Products for AFD Issued by BUF

Area Forecast Discussion
Issued by NWS Buffalo, NY
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FXUS61 KBUF 170551
AFDBUF

Area Forecast Discussion
National Weather Service Buffalo NY
151 AM EDT Wed Apr 17 2024

.SYNOPSIS...
High pressure over the region will shift east tonight. Showers and
some thunderstorms will return Wednesday into Thursday as a broad
area of weakening low pressure passes by to our northwest sending a
warm front through the region Wednesday, followed by a cold front
Wednesday night into Thursday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
There will be partly cloudy skies across the western & north
central NY area with high clouds slowly filling in from west to
east overnight.

A highly amplified upper level ridge will nudge east over the lower
Great Lakes tonight, maintaining dry weather for most if not all of
the night tonight with a gradual increase in clouds overnight. The
exception may be across far southwest New York toward Wednesday
morning as the leading edge of a band of showers associated with a
warm front extending well east of an area of low pressure moving
east across the upper Mississippi Valley approaches from the west.
Lows will range from the lower to mid 30s across the North Country
to the lower and mid 40s across far western New York.

Shower chances ramp up Wednesday starting in the morning across
western New York, reaching the Finger Lakes by afternoon as a
distinct surge of moisture and ascent in advance of a warm front
works into the area during this time frame. Some embedded
thunder or at least a rumble or two is possible during the
morning as elevated portion of the activity works through. There
will be a better chance for thunderstorms during the later part
of the afternoon, especially across western New York as a
pocket of modest instability develops with the emerging warm
sector.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...
A weakening low pressure crossing the upper Great Lakes will send a
pair of front through the eastern Great Lakes Wednesday night into
Thursday morning. We will see some showers which may produce a few
rumbles of thunder as the fronts work from west to east through the
region. A slow drying trend will take place by Thursday afternoon
behind the fronts as a dry slot works into the region. This will be
followed by a brief mid-level ridge advertised to work through the
region Thursday night ahead of the next upstream trough rapidly
approaching the Lower Lakes.

A strong cold front is advertised to track through the forecast area
Friday with an area of showers working through the forecast area.
CAA will ramp up in its wake with a colder air mass wrapping in
within the west-northwest cyclonic flow. Another dry slot will bring
a brief abrupt end to any remaining showers Friday night for most
locales.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
A cold front will cross the area during the morning on Saturday,
causing additional showers into the afternoon. Behind this passing
front, a large area of high pressure will drop southeast across the
plains and dominate most of the eastern half of the CONUS. This will
result in mainly dry conditions from Saturday night through at least
early Monday night.

A potent trough will drop southeast across the Great Lakes Monday
night into Tuesday, within the larger scale troughing pattern that
will be in place. This will increase the potential for another round
of showers Tuesday into Tuesday night as a a weak sfc low and cold
front round the base of the larger trough.

Temperatures during the entire long term period will start out below
normal with highs in the mid 40s to low 50s for the weekend.
Temperatures will warm to near and a few degrees above normal for
Monday and Tuesday with highs in the lows 50s to mid 60s, with
Tuesday being the warmer of the two days.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
VFR conditions will continue across western and north central
NY through Wednesday morning. Overall, mid to high level clouds
will increase from west to east into Wednesday morning. Rain
showers will enter western NY Wednesday morning as a warm front
approaches from the west. Showers and lowering ceilings will
expand east resulting in low- end VFR to MVFR conditions across
western NY by Wednesday afternoon. VFR conditions will persist
east of Lake Ontario (KART) for much of Wednesday.

Unsettled conditions with degraded flight conditions will
continue into Wednesday evening with widespread rain showers and
in vicinity of Lake Ontario and the eastern Lake Ontario
region. Mainly MVFR conditions are expected across the region
but IFR conditions are possible across the Finger Lakes region
and into central NY (outside of TAF sites.) Another round of
showers with a chance of thunderstorms will enter western NY
Wednesday evening. Thunderstorms and heavy showers may result in
IFR or lower at KIAG, KBUF, and KJHW through Wednesday evening.
Confidence is low for coverage of convection, however best
chance will be near the NY/PA line and KJHW between (22z-03z.)

Outlook...

Wednesday night and Thursday...MVFR/VFR with showers likely.
Friday and Saturday...MVFR/VFR with a chance of showers.
Sunday...Mainly VFR.

&&

.MARINE...
High pressure over the lower Great Lakes will slide east tonight.
Winds will turn easterly and increase later tonight and Wednesday
with Small Craft Advisory conditions expected along portions of Lake
Ontario, especially on the western end ahead of an approaching warm
front.

Winds turn more southerly on both Lakes behind the warm front by
Thursday.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...None.
MARINE...Small Craft Advisory until 2 AM EDT Thursday for LOZ042-043.

&&

$$

SYNOPSIS...JM/TMA
NEAR TERM...HSK/JM/SW/TMA
SHORT TERM...AR
LONG TERM...SW
AVIATION...HSK
MARINE...JM/TMA
National Weather Service Regional Headquarters
