Severe Thunderstorm Warning 34, NWS Buffalo, NY

238 
WWUS51 KBUF 212152
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
552 PM EDT Fri Jun 21 2024

NYC069-212215-
/O.CON.KBUF.SV.W.0034.000000T0000Z-240621T2215Z/
Ontario NY-
552 PM EDT Fri Jun 21 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN ONTARIO COUNTY...

At 551 PM EDT, a severe thunderstorm was located over Phelps, or near
Geneva, moving east at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Geneva, Clifton Springs, Phelps, Gorham, Seneca Castle, Hall, and
West Junius.

This includes Interstate 90 near exit 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4280 7718 4284 7718 4299 7721 4301 7697
      4288 7697 4287 7696 4287 7698 4284 7697
      4278 7697
TIME...MOT...LOC 2151Z 251DEG 17KT 4293 7709 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

PP

121 
WWUS51 KBUF 212211
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
611 PM EDT Fri Jun 21 2024

NYC069-212220-
/O.EXP.KBUF.SV.W.0034.000000T0000Z-240621T2215Z/
Ontario NY-
611 PM EDT Fri Jun 21 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ONTARIO COUNTY
WILL EXPIRE AT 615 PM EDT...

The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will 
be allowed to expire. However, gusty winds are still possible with 
this thunderstorm.

&&

LAT...LON 4280 7718 4284 7718 4299 7721 4301 7697
      4288 7697 4287 7696 4287 7698 4284 7697
      4278 7697
TIME...MOT...LOC 2210Z 251DEG 24KT 4297 7694 

$$

PP

Area Forecast Discussion
National Weather Service Buffalo NY
225 PM EDT Fri Jun 21 2024

.SYNOPSIS...
While it will still be uncomfortably warm and humid through this
weekend, a frontal boundary oscillating back and forth over our
region will support enough cloud cover and some thunderstorm
activity to suppress the dangerously high heat indices.
Unfortunately, the daily thunderstorms will carry the risk of
torrential downpours and even severe weather. Notably cooler and
more comfortable conditions can then be expected next week,
especially during the latter half.

&&

.NEAR TERM /THROUGH SATURDAY/...
This afternoon a frontal boundary has dropped southward to around
Route 20A. Ahead of this front a still very warm and humid (PWATs
1.75") atmosphere is creating SBCAPE values of several thousand
J/KG, while behind the front instability is not as great.
Additionally ahead (south) of this front DCAPE values approaching
800 J/KG and lift along a lake breeze and frontal boundary will
support scattered to numerous thunderstorms, of which some may
become severe. Thinking most of this activity will be now through 8
pm, then some weakening to the instability will begin to diminish
coverage area of storms.

This evening subtle surface wave will bring a plume of deeper
moisture northward over Lake Erie, clipping NW Niagara Frontier.
This increase in moisture and lift near the surface low could fuel a
few evening storms across NW portions of our region. This low will
also begin to drag the frontal boundary northward.

Otherwise tonight will be fairly dry to the south, with potential
for fog formation, especially near areas that received afternoon
storms. To the north and near the frontal boundary and deeper
moisture a few showers and thunderstorms can not be ruled out.

It will be mild again tonight with overnight lows in the mid 60s to
lower 70s.

Saturday with this frontal boundary still wavering near northern
portions of our region, and plenty of instability showers and
thunderstorms will again blossom. Favored regions of lake breeze
boundrys and near the front will for storms. This will leave just
areas NE of Lake Erie with the lowest chances for storms. Highs
tomorrow will be in the mid to upper 80s, which with the humidity
will yield apparent temperatures 90 to 95F. Deeper moisture/cloud
cover east of Lake Ontario will likely keep this area in the mid 70s
for highs.

&&

.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/...
An upper level trough will begin to dive across the upper Midwest
Saturday night, causing associated low pressure to strengthen across
the central Great Lakes and lift the warm front north of the region.
This will place the area beneath the warm sector, supporting ample
warm moist air advection. Overall the chances for showers and
thunderstorms will continue throughout Saturday night, with the best
likelihood for activity lying across the North Country due to its
close proximity to the front.

The now (roughly) 995mb surface low and associated trough will track
to the north of the area and result in a windy day Sunday, given the
850mb winds ramp up to nearly 45 knots. Overall this will support
the passage of a strong cold front across the area, likely producing
thunderstorms with its passage. Organized convection featuring
damaging winds will also be possible due to the ample wind shear
across the region. With this cold frontal passage, the arrival time
will play an important role with convection. There still are
significant differences in model guidance timing the frontal passage
and strength of the low. SPC has a portion of our area in a marginal
risk for severe weather. Even without thunderstorms, it will be a
windy day with wind gusts across the Niagara Frontier around 45 mph.

The cold front will then slide to the east of the area Sunday night,
supporting lingering showers and thunderstorms to taper off from
west to east.

The potent shortwave trough aloft will move across New England Monday
and bring increasing chances for showers and a few thunderstorms
across the North Country with lower chances elsewhere. After such a
warm and humid week, it will be notably cooler and drier Monday with
highs in the 70s.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
An upper level trough over New England Monday night will shift into
the Canadian Maritimes by Tuesday, allowing a progressive mid-level
ridge to briefly become established across the eastern Great Lakes.
An attendant area of surface high pressure shifting southeast across
the Appalachians to the Mid-Atlantic coast will provide the forecast
area with a period of rain-free weather, while giving temperatures
an upwards nudge back into the low and mid 80s by Tuesday afternoon.

Shower and thunderstorm chances return from west to east late
Tuesday evening and through Tuesday night as the mid-level ridge
moves east, causing a warm front to lift out of the Ohio Valley and
into WNY. Confidence is low in timing and coverage of
showers/thunderstorms associated with this front as long range
guidance is in poor agreement on the evolution of a shortwave
expected to slide east across Southern Ontario and the Great Lakes
during this same timeframe. Greater chances for showers and
thunderstorms will arrive Wednesday as a ~982mb surface low tracks
across northern Quebec, sending its elongated cold front through the
Northeast. While timing of this front and its associated prefrontal
trough remain in question and thus lend lower confidence in how
convection will ultimately unfold Wednesday...The system is expected
to tap into a deeper plume of GOMEX-based moisture with PWATs
potentially climbing to near 2" as it approaches. Thus, any storms
that develop and move through the region should have the potential
to bring locally heavy rains.

The primary cold front should move through the region Wednesday
night, with increasing subsidence and a drier airmass allowing
shower/thunderstorm chances to decrease from west to east in its
wake. As much of the Northeast sits within the post-frontal airmass,
temperatures will be notably cooler Thursday and Thursday night,
with highs in the low/mid 70s and lows in the 50s and upper 40s
respectively. Dry weather should then last through the end of the
week with moderating temperatures as surface high pressure moves
over and east of the region.

&&

.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
For the 18Z TAFS VFR flight conditions will largely rule, but there
will be two concerns.

First, afternoon and evening showers and thunderstorms. Greatest
instability and mid level lapse rates are found across interior WNY,
with convection along and out ahead of a lake breeze boundary.
Storms near KJHW early will push eastward. A frontal boundary,
roughly near route 20A will confine the deeper instability
southward, with KIAG, KROC and KART likely to remain dry through the
afternoon hours. KBUF, closer to the front, will likely stay dry,
but storms could near the TAF site late this afternoon.

The second concern will be the formation of fog and or low stratus.
Most likely areas for fog will be near areas where rain occurred
today, and will highlight the southern Tier, and towards the Finger
Lakes. This fog may expand towards KJHW tonight.

Tomorrow, with this frontal boundary still draped across our
region, additional showers and thunderstorms are likely, least
likely near KBUF where a lake breeze circulation will likely spread
a more stable layer inland.

Outlook...

Saturday night...Mainly VFR. A chance for evening thunderstorms
inland from the lakes.

Sunday...VFR/MVFR. Showers and thunderstorms likely.

Monday...Mainly VFR. A chance for afternoon and evening
thunderstorms inland from the lakes.

Tuesday...Mainly VFR conditions expected.

Tuesday night and Wednesday...MVFR/VFR with a chance for showers and
thunderstorms.

&&

.MARINE...
Light winds and minimal wave action is expected to continue across
the Lower lakes through tomorrow. There will be a chance of
afternoon showers and thunderstorms which could produce gusty winds
and higher wave action each day.

A cold front will approach the region Sunday with increasing southwest
winds which may bring a period of SCAs to area lakes. Northerly
flow behind the front will then bring continued choppy conditions
to the lakes through Monday. High pressure builds in late Monday with
diminishing winds and waves for Tuesday.

&&

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

&&

SYNOPSIS...AR/RSH/Thomas
NEAR TERM...Thomas
SHORT TERM...Apffel
LONG TERM...PP
AVIATION...Thomas
MARINE...AR/Thomas

Hazardous Weather Outlook
National Weather Service Buffalo NY
438 AM EDT Fri Jun 21 2024

NYZ012>014-019>021-085-220845-
Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany-
Southern Erie-
438 AM EDT Fri Jun 21 2024

This Hazardous Weather Outlook is for portions of western New York.

.DAY ONE...Today and tonight.

Isolated to scattered showers and thunderstorms will be possible
today. Any storms that do develop will be capable of producing
damaging winds and torrential rainfall.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

This product, along with other watches, warnings, advisories, and
statements issued by the National Weather Service office in Buffalo
can be found on the internet at http://www.weather.gov/buf

NYZ001>008-010-011-220845-
Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Jefferson-Lewis-
Northern Erie-Genesee-
438 AM EDT Fri Jun 21 2024

This Hazardous Weather Outlook is for portions of western and north
central New York.

.DAY ONE...Today and tonight.

An isolated shower and thunderstorm will be possible today. Any
storms that do develop will be capable of producing damaging winds
and torrential rainfall.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

This product, along with other watches, warnings, advisories, and
statements issued by the National Weather Service office in Buffalo
can be found on the internet at http://www.weather.gov/buf

LEZ020-LOZ030-042>045-062>065-SLZ022-024-220845-
Upper Niagara River and Buffalo Harbor-Lower Niagara River-
Lake Ontario nearshore waters from the Niagara River to Hamlin Beach-
Lake Ontario nearshore waters from Hamlin Beach to Sodus Bay-
Lake Ontario nearshore waters from Sodus Bay to Mexico Bay-
Lake Ontario nearshore waters from Mexico Bay to the Saint Lawrence
River-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
Lake Ontario open waters from Hamlin Beach to Sodus Bay-
Lake Ontario open waters from Sodus Bay to Mexico Bay-
Lake Ontario open waters from Mexico Bay to the Saint Lawrence River-
Saint Lawrence River from Cape Vincent to Ogdensburg-
Saint Lawrence River from Ogdensburg to Saint Regis-
438 AM EDT Fri Jun 21 2024

This Hazardous Weather Outlook is for portions of Lake Erie, Lake
Ontario and Saint Lawrence River.

.DAY ONE...Today and tonight.

An isolated shower and thunderstorm will be possible today. Any
storms that do develop will be capable of producing strong gust
winds and higher wave action.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

This product, along with other watches, warnings, advisories, and
statements issued by the National Weather Service office in Buffalo
can be found on the internet at http://www.weather.gov/buf

LEZ040-041-220845-
Lake Erie nearshore waters from Ripley to Dunkirk-
Lake Erie nearshore waters from Dunkirk to Buffalo-
438 AM EDT Fri Jun 21 2024

This Hazardous Weather Outlook is for portions of Lake Erie.

.DAY ONE...Today and tonight.

An isolated shower and thunderstorm will be possible today. Any
storms that do develop will be capable of producing strong gust
winds and higher wave action.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

This product, along with other watches, warnings, advisories, and
statements issued by the National Weather Service office in Buffalo
can be found on the internet at http://www.weather.gov/buf

Reynolds

Special Weather Statement
National Weather Service Buffalo NY
154 PM EDT Fri Jun 21 2024

NYZ012>014-019>021-212000-
Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany-
Including the cities of Warsaw, Geneseo, Canandaigua, Jamestown,
Olean, and Wellsville
154 PM EDT Fri Jun 21 2024

...Strong Thunderstorms Possible This Afternoon...

Showers and thunderstorms are expected this afternoon for the
Western Southern Tier, Upper Genesee Valley and the Northern
Finger Lakes. Some of the showers and thunderstorms will be
capable of producing heavy downpours, gusty winds to 40 MPH, small
hail and frequent lightning. There is a Marginal Risk for severe
thunderstorms today in these areas as well, and an isolated severe
thunderstorm can't be ruled out.

SW

Special Weather Statement
National Weather Service Buffalo NY
249 PM EDT Fri Jun 21 2024

NYZ014-211930-
Ontario NY-
249 PM EDT Fri Jun 21 2024

...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL ONTARIO COUNTY
THROUGH 330 PM EDT...

At 249 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rushville, or near Canandaigua, moving northeast at 15 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Geneva, Seneca Castle, Seneca Lake State Park, and Hall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4290 7722 4295 7697 4287 7696 4287 7698
      4284 7697 4281 7697 4276 7698 4276 7709
TIME...MOT...LOC 1849Z 242DEG 13KT 4284 7719

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

PP

Preliminary Local Storm Report
National Weather Service Buffalo NY
407 PM EDT Fri Jun 21 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0233 PM     Tstm Wnd Dmg     4 NNW Rushville         42.81N 77.26W
06/21/2024                   Ontario            NY   911 Call Center

            Time estimated based on radar. Tree leaning
            on wires.

&&

PP

Special Weather Statement
National Weather Service Buffalo NY
502 PM EDT Fri Jun 21 2024

NYZ001-010-085-212145-
Southern Erie NY-Niagara NY-Northern Erie NY-
502 PM EDT Fri Jun 21 2024

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL ERIE AND SOUTH CENTRAL
NIAGARA COUNTIES THROUGH 545 PM EDT...

At 459 PM EDT, Doppler radar was tracking a strong thunderstorm near
Grand Island, or 8 miles west of Tonawanda, moving east at 25 mph. A
gust front out ahead of this thunderstorm will cause brief gusty
winds from Grand Island to Buffalo to Sturgeon Point and continue
east from Lake Erie and the Niagara River.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Buffalo, Cheektowaga, West Seneca, North Tonawanda, Clarence,
Lackawanna, Kenmore, Depew, Tonawanda, Amherst, Lancaster, Hamburg,
East Aurora, Williamsville, Grand Island, Elma, Boston, Eden, Colden,
and Orchard Park.

This includes Interstate 90 between exits 49 and 57A.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4273 7908 4280 7892 4284 7893 4292 7890
      4296 7893 4299 7901 4302 7902 4305 7900
      4307 7901 4307 7846 4250 7875 4270 7910
TIME...MOT...LOC 2059Z 284DEG 21KT 4295 7904

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Welch