Flash Flood Warning 1, NWS Buffalo, NY

001 
WGUS71 KBUF 092113
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
513 PM EDT Wed Jun 9 2021

NYC003-092230-
/O.CON.KBUF.FF.W.0001.000000T0000Z-210609T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-
513 PM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT THIS 
EVENING FOR SOUTHWESTERN ALLEGANY COUNTY...

At 512 PM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 2 and 3 inches 
of rain have fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Bolivar, Richburg and West Clarksville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 4219 7819 4209 7815 4206 7820 4204 7827
      4206 7831 4217 7831 4220 7831 4220 7830

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1.5 HOURS 

$$

HSK

802 
WGUS71 KBUF 092224
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
624 PM EDT Wed Jun 9 2021

NYC003-092234-
/O.EXP.KBUF.FF.W.0001.000000T0000Z-210609T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-
624 PM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT THIS EVENING FOR 
SOUTHWESTERN ALLEGANY COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 4219 7819 4209 7815 4206 7820 4204 7827
      4206 7831 4217 7831 4220 7831 4220 7830

$$

JLA

Area Forecast Discussion
National Weather Service Buffalo NY
257 PM EDT Wed Jun 9 2021

.SYNOPSIS...
Cold front is in process of sweeping south across the region. Chance
for showers and thunderstorms with brief heavy downpours will
continue rest of the afternoon mainly over Southern Tier. For most
part, a dry, cooler and less humid day in store on Thursday though
an isolated shower or thunderstorm could pop-up in the afternoon
along the NY/PA state line. Weak system moves through Friday with a
chance of a few showers or a thunderstorm.

&&

.NEAR TERM /THROUGH THURSDAY/...
Cold front is in process of dropping through region, but it is
coming through in pieces with wind shift to the northeast as far
south as northern PA with cooler and less humid air lagging well
behind. Narrow west to east oriented line of clouds over North
Country just passing through KART and KGTB signaling dewpoints
lowering into the 50s toward St. Lawrence per NY Mesonet plot. Only
real cooling today though is along immediate shoreline of Lake
Ontario with onshore flow. Otherwise, all areas south of Lake
Ontario and even into the North Country are into at least the lower
if not middle 80s.

Scattered showers and thunderstorms will remain in place for next
several hours over Southern Tier. Similar to yesterday, deep layer
shear weak and storm motions slow, so heavy rainers will be primary
hazard. A bit more dry air in the mid-levels today per 12z BUF
sounding so DCAPE will be slightly higher this afternoon and already
had report from northern PA of wind damage, thus stronger storms
that build higher cores will also pose risk of stronger wind gusts.

Cooling and drying trend takes hold all areas later this evening.
Chances for storms will quickly diminish in coverage as a drier air
mass begins to work into the Lower Lakes. Humidity levels will
slowly fall off tonight. Cooler air from Canada will also begin to
infiltrate from the northeast into the region. Readings over the
North Country will fall into the mid 50s east of Lake Ontario while
upper 50s to low 60s will be found elsewhere by sunrise. After some
patchy fog early in the overnight over the Southern Tier, skies will
turn mostly clear later in the night all areas just in time for the
solar eclipse that will impact our area around daybreak on Thursday.

Thursday, sfc high pressure from the Hudson Bay to the Gulf of Maine
will largely provide a dry and pleasant day. With that said, there
may still be a small chance of a shower or storm mid to late
afternoon along the NY/PA border as the cold front stalls to the
south. Otherwise, with lower humidity, expect highs to reach the
upper 70s to mid 80s.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
The cold front will be well south of the New York State border
Thursday night. Dry conditions expected with temperatures in the
mid to upper 50s to the lower 60s along the lakeshore.

An inverted surface trough sharpens across western and central NY
Friday. A southerly wind in the lower levels will transport moisture
back into the region. A strengthening wind field through the day
will increase the 0-6 bulk shear across the region. Diurnally driven
showers and thunderstorms in vicinity of the surface trough across
western NY are expected in the afternoon into evening. Lake breeze
circulations will lead to some storms inland from the Lakes. High
temperatures will rise into the upper 70s to lower 80s. Activity
will dissipate in the evening.

A shortwave trough will track to the east Friday night into Saturday
while a upper level ridge builds in from the west. This will keep
the region mainly dry with only isolated showers across the higher
terrain during the afternoon. Temperatures will fall to the upper
50s to lower 60s rising to the upper 70s to lower 80s Saturday.

&&

.LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/...
A pattern shift will occur during this period as a trough arrives
across the Great Lakes and Northeast by early next week. Prior to
this, a cold front will track across the eastern Great Lakes from
low pressure in southern Quebec Saturday night into Sunday. The
timing of the frontal passage is overnight which makes is less
conducive for thunderstorms however an area of showers will likely
cross the region.

A secondary cold front will move through the region Monday,
reinforcing northwest flow and cold air advection. Temperatures will
go from near normal Sunday-Monday to below normal Tuesday-Wednesday.
As the trough stays across the region, rain showers are possible
through Wednesday.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
VFR prevails through Thursday. Could see brief MVFR CIGS and VSBY
this afternoon at JHW though as showers and isolated thunderstorms
remain in the vicinity. Localized IFR in fog possible tonight across
parts of the Southern Tier where rain occurs this afternoon, but
this will end by daybreak Thursday as drier air arrives.

Outlook...

Thursday night and Friday...Mainly VFR. A few spotty showers or
storm still possible across the S. Tier on Friday.

Saturday...VFR.
Sunday and Monday...Mainly VFR. Chance of showers and thunderstorms.

&&

.MARINE...
Back door cold front will sweep north to south across region through
tonight. Moderate east to northeast winds behind the front will
result in choppy conditions at times Thursday into Friday,
especially on Lake Ontario.

&&

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

&&

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

Hazardous Weather Outlook
National Weather Service Buffalo NY
521 AM EDT Wed Jun 9 2021

NYZ001>008-010-011-100930-
Niagara-Orleans-Monroe-Wayne-Northern Cayuga-Oswego-Jefferson-Lewis-
Northern Erie-Genesee-
521 AM EDT Wed Jun 9 2021

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

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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-LOZ042>045-062>065-100930-
Lake Erie nearshore waters from Ripley to Dunkirk-
Lake Erie nearshore waters from Dunkirk to Buffalo-
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-
521 AM EDT Wed Jun 9 2021

This Hazardous Weather Outlook is for portions of Lake Erie and Lake
Ontario.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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-SLZ022-024-100930-
Upper Niagara River and Buffalo Harbor-Lower Niagara River-
Saint Lawrence River from Cape Vincent to Ogdensburg-
Saint Lawrence River from Ogdensburg to Saint Regis-
521 AM EDT Wed Jun 9 2021

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

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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

NYZ012>014-019>021-085-100930-
Wyoming-Livingston-Ontario-Chautauqua-Cattaraugus-Allegany-
Southern Erie-
521 AM EDT Wed Jun 9 2021

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

.DAY ONE...Today and tonight.

Scattered thunderstorms this afternoon will be capable of producing
locally heavy rain which could lead to minor flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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
128 PM EDT Wed Jun 9 2021

NYZ019>021-091900-
Chautauqua-Cattaraugus-Allegany-
128 PM EDT Wed Jun 9 2021

...DEVELOPING THUNDERSTORMS WILL AFFECT SOUTHERN CATTARAUGUS...
SOUTHERN CHAUTAUQUA AND SOUTHERN ALLEGANY COUNTIES...

At 124 PM EDT, radar indicated thunderstorms were developing along a
line extending from near Clymer to Andover and Whitesville. The
storms are moving southwest at 10 mph. The strongest cluster of
storms will impact far southeast Allegany county as storms over
Stueben county move westward into the area.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Jamestown, Olean, Salamanca, Wellsville, Allegany State Park,
Lakewood, Falconer, Allegany, Clymer, St. Bonaventure, Jamestown
West, Whitesville, Weston Mills, Frewsburg, Busti, Hinsdale, Scio,
Carrollton, Celoron and Bolivar.

This includes Interstate 86 near exit 12, between exits 17 and 19,
and between exits 21 and 26.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

These storms 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 4200 7976 4210 7976 4220 7774 4200 7775
TIME...MOT...LOC 1724Z 029DEG 4KT 4206 7964 4212 7765

JLA

Special Weather Statement
National Weather Service Buffalo NY
233 PM EDT Wed Jun 9 2021

NYZ021-091900-
Allegany-
233 PM EDT Wed Jun 9 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL ALLEGANY COUNTY...

At 233 PM EDT, a strong thunderstorm was located near Wellsville,
moving southwest at 15 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Wellsville, Alma, Stannards and Knight Creek.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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.

LAT...LON 4200 7824 4215 7798 4203 7784 4200 7787
TIME...MOT...LOC 1833Z 046DEG 15KT 4204 7797

Mitchell

Special Weather Statement
National Weather Service Buffalo NY
309 PM EDT Wed Jun 9 2021

NYZ020-092015-
Cattaraugus-
309 PM EDT Wed Jun 9 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CATTARAUGUS
COUNTY...

At 308 PM EDT, a strong thunderstorm was located near Salamanca,
moving southwest at 10 mph.

Wind gusts up to 50 mph and half inch hail are possible with this
storm.

Locations impacted include...
Salamanca, Allegany State Park, Great Valley, Carrollton, Humphrey,
Ellicottville, Vandalia, Allegheny Reservoir, Onoville, Limestone and
Kill Buck.

This includes Interstate 86 between exits 18 and 23.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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 4200 7903 4230 7863 4218 7845 4200 7862
TIME...MOT...LOC 1908Z 042DEG 11KT 4219 7861

Mitchell