Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 68, NWS Buffalo, NY

August 9, 20094 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 9, 2009, 1:57 PM EDT for 4 counties in New York. It was in force for 63 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 9, 2009, 1:57 PM EDT (17:57 UTC)
Expired
Aug 9, 2009, 3:00 PM EDT
In force
63 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Livingston County, NY

The radar

The Buffalo radar (KBUF), 77 km from the middle of the area, began a volume at 18:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 9, 2:00 PM EDTTSTM WND DMGAshford, NYTREES/WIRES DOWN
Aug 9, 2:12 PM EDTTORNADO 1Cuba, NYEF-1 TORNADO CONFIRMED BY NWS SURVEY. PATH LENGTH 6 MILES, WIDTH 25 YDS. MAX WIND SPEED 100 MPH. NO INJURIES OR FATALITIES.
Aug 9, 2:12 PM EDTTORNADORushford, NYPUBLIC REPORTED TORNADO TOUCHDOWN IN THE VICINITY OF RUSHFORD. WIDESPREAD DAMAGA REPORTED
Aug 9, 2:15 PM EDTTSTM WND DMGBlack Creek, NY100 TO 200 TREES DOWN IN A ABOUT A 50 FOOT WIDE PATH. POSSIBLE TORNADO. WILL BE SURVEYED MONDAY MORNING.
Aug 9, 2:25 PM EDTTSTM WND DMGHinsdale, NYTREES/WIRES DOWN. NUMEROUS TREES/WIRES DOWN COUNTY WIDE. SOME ROADS BLOCKED BY FALLEN TREES

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 9, 11:57 AM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.0 hours before the alert went out and 74 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2009-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 913 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2009-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
913 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
495 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KBUF 091757
SVRBUF
NYC003-009-013-051-091900-
/O.NEW.KBUF.SV.W.0068.090809T1757Z-090809T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
157 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLEGANY COUNTY IN WESTERN NEW YORK
  CATTARAUGUS COUNTY IN WESTERN NEW YORK
  SOUTHERN CHAUTAUQUA COUNTY IN WESTERN NEW YORK
  SOUTHEASTERN LIVINGSTON COUNTY IN WESTERN NEW YORK

* UNTIL 300 PM EDT

* AT 156 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE       
  EXTENDING FROM 6 MILES EAST OF ARKPORT TO 9 MILES NORTHWEST OF     
  OLEAN TO 17 MILES SOUTHWEST OF JAMESTOWN...AND MOVING SOUTH AT     
  55 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WESTON MILLS...ST. BONAVENTURE AND OLEAN BY 205 PM EDT...
  WELLSVILLE BY 210 PM EDT...
  WHITESVILLE BY 220 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4200 7977 4207 7978 4261 7755 4258 7753
      4258 7765 4251 7771 4199 7775
TIME...MOT...LOC 1757Z 339DEG 48KT 4240 7757 4218 7850
          4194 7950

$$

JJR
2 follow-up statements
000 
WWUS51 KBUF 091823
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
223 PM EDT SUN AUG 9 2009

NYC051-091832-
/O.CAN.KBUF.SV.W.0068.000000T0000Z-090809T1900Z/
LIVINGSTON NY-
223 PM EDT SUN AUG 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON COUNTY
IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

LAT...LON 4200 7949 4211 7955 4229 7842 4246 7771
      4199 7775
TIME...MOT...LOC 1822Z 339DEG 48KT 4241 7753 4220 7838
          4205 7939

$$

NYC003-009-013-091900-
/O.CON.KBUF.SV.W.0068.000000T0000Z-090809T1900Z/
CHAUTAUQUA NY-CATTARAUGUS NY-ALLEGANY NY-
223 PM EDT SUN AUG 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR ALLEGANY...SOUTHERN CATTARAUGUS AND SOUTHEASTERN CHAUTAUQUA
COUNTIES...

AT 220 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM 13 MILES NORTHEAST OF ALMOND TO ISCHUA TO
PANAMA...OR ALONG A LINE EXTENDING FROM COHOCTON TO 10 MILES NORTH OF
OLEAN TO 9 MILES WEST OF JAMESTOWN...MOVING SOUTH AT 55 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SCIO AND WESTON MILLS AND ST. BONAVENTURE BY 230 PM EDT...
  WELLSVILLE AND RICHBURG AND PORTVILLE BY 235 PM EDT...
  STANNARDS BY 240 PM EDT...
  WHITESVILLE BY 245 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS MUCH OF THE SOUTHERN TIER. THIS IS AN EXTREMELY DANGEROUS 
SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4200 7949 4211 7955 4229 7842 4246 7771
      4199 7775
TIME...MOT...LOC 1822Z 339DEG 48KT 4241 7753 4220 7838
          4205 7939

$$

SAGE
000 
WWUS51 KBUF 091856
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
256 PM EDT SUN AUG 9 2009

NYC003-009-013-091906-
/O.EXP.KBUF.SV.W.0068.000000T0000Z-090809T1900Z/
CHAUTAUQUA NY-CATTARAUGUS NY-ALLEGANY NY-
256 PM EDT SUN AUG 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR ALLEGANY...SOUTHERN
CATTARAUGUS AND SOUTHEASTERN CHAUTAUQUA COUNTIES WILL EXPIRE AT 300
PM EDT...

AT 256 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAVE EXITED THE WARNED 
AREA...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

LAT...LON 4200 7949 4211 7955 4229 7842 4246 7771
      4199 7775
TIME...MOT...LOC 1856Z 339DEG 48KT 4198 7732 4177 7816
          4163 7917

$$

SAGE

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 10:05 AM EDTSmall Craft AdvisoryBUF5 hr
Aug 9, 11:56 AM EDTSpecial Marine WarningBUF42 min
Aug 9, 12:07 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Niagara, Orleans53 min
Aug 9, 12:46 PM EDTSpecial Marine WarningBUF59 min
Aug 9, 12:51 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Erie, Genesee, Livingston, Monroe, Wyoming54 min
Aug 9, 1:35 PM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 3 more55 min
Aug 9, 1:42 PM EDTSpecial Marine WarningBUF33 min
Aug 9, 2:07 PM EDTTornado WarningBUFAllegany, Cattaraugus39 min
Aug 9, 2:18 PM EDTFlash Flood WarningBUFAllegany, Cattaraugus, Chautauqua84 min

Nearby

Severe Thunderstorm Warnings in New York, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.