Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 95, NWS Buffalo, NY

September 11, 2011Genesee County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 11, 2011, 2:04 PM EDT for Genesee County, Wyoming County, New York. It was in force for 41 min. 1 report 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
Sep 11, 2011, 2:04 PM EDT (18:04 UTC)
Expired
Sep 11, 2011, 2:45 PM EDT
In force
41 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Genesee County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 33 km from the middle of the area, began a volume at 18:03 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
Sep 11, 2:10 PM EDTHAIL 0.75Varysburg, NY

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.1 hours before the alert went out and 29 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 2011-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1397 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

957 
WUUS51 KBUF 111804
SVRBUF
NYC037-121-111845-
/O.NEW.KBUF.SV.W.0095.110911T1804Z-110911T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
204 PM EDT SUN SEP 11 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN GENESEE COUNTY IN WESTERN NEW YORK
  NORTHERN WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 245 PM EDT

* AT 159 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 4 MILES
  WEST OF VARYSBURG...OR 11 MILES EAST OF EAST AURORA...AND MOVING
  EAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  VARYSBURG...
  WARSAW...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. 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.

&&

LAT...LON 4278 7846 4278 7848 4287 7848 4287 7846
      4291 7846 4292 7810 4270 7808 4266 7846
TIME...MOT...LOC 1804Z 260DEG 17KT 4276 7838

$$

HIBBERT
1 follow-up statement
731 
WWUS51 KBUF 111832
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
232 PM EDT SUN SEP 11 2011

NYC037-121-111845-
/O.CON.KBUF.SV.W.0095.000000T0000Z-110911T1845Z/
GENESEE NY-WYOMING NY-
232 PM EDT SUN SEP 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR CENTRAL WYOMING AND SOUTH CENTRAL GENESEE COUNTIES...

AT 231 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR VARYSBURG...OR 16 MILES SOUTH OF BATAVIA...MOVING EAST
AT 15 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  WARSAW...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. 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.

&&

LAT...LON 4268 7831 4288 7836 4292 7810 4270 7808
TIME...MOT...LOC 1832Z 260DEG 12KT 4278 7824

$$

HIBBERT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 12:34 PM EDTSpecial Weather StatementBUFErie56 min
Sep 11, 12:40 PM EDTFlash Flood WarningBUFCattaraugus, Chautauqua, Erie3 hr
Sep 11, 12:43 PM EDTSpecial Weather StatementBUFGenesee62 min
Sep 11, 12:46 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Monroe, Wyoming44 min
Sep 11, 1:33 PM EDTSevere Thunderstorm WarningBUFLivingston, Wyoming42 min
Sep 11, 1:34 PM EDTFlash Flood WarningBUFLivingston, Wyoming3 hr
Sep 11, 1:55 PM EDTSevere Thunderstorm WarningBUFOntario50 min
Sep 11, 2:17 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Ontario, Wyoming43 min
Sep 11, 2:46 PM EDTSevere Thunderstorm WarningBUFLivingston, Monroe, Ontario44 min
Sep 11, 4:31 PM EDTSpecial Weather StatementBUFChautauqua59 min
Sep 11, 5:01 PM EDTSpecial Weather StatementBUFErie59 min
Sep 11, 5:21 PM EDTAreal Flood AdvisoryBUFNiagara114 min

Nearby

Severe Thunderstorm Warnings in New York, 2011Every severe thunderstorm warning in 2011

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.