Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 56, NWS Buffalo, NY

July 26, 2009Genesee County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 26, 2009, 1:51 PM EDT for Genesee County, Wyoming County, New York. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 26, 2009, 1:51 PM EDT (17:51 UTC)
Expired
Jul 26, 2009, 2:30 PM EDT
In force
39 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 17:51 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.9 hours before the alert went out and 30 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 2009-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 267 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 2009-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.1939587897117Sfc1 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
267 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
820 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBUF 261751
SVRBUF
NYC037-121-261830-
/O.NEW.KBUF.SV.W.0056.090726T1751Z-090726T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
151 PM EDT SUN JUL 26 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 230 PM EDT

* AT 150 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR BENNINGTON...OR 12 MILES NORTHEAST OF EAST
  AURORA...AND MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DARIEN BY 200 PM EDT...
  ATTICA BY 205 PM EDT...
  BATAVIA BY 225 PM EDT...

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 4275 7841 4284 7849 4287 7848 4288 7846
      4293 7846 4312 7805 4292 7794
TIME...MOT...LOC 1752Z 236DEG 24KT 4286 7840

$$

JJR
2 follow-up statements
000 
WWUS51 KBUF 261814
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
214 PM EDT SUN JUL 26 2009

NYC121-261822-
/O.CAN.KBUF.SV.W.0056.000000T0000Z-090726T1830Z/
WYOMING NY-
214 PM EDT SUN JUL 26 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WYOMING COUNTY IS
CANCELLED...

LAT...LON 4293 7846 4312 7805 4292 7794 4287 7808
      4288 7809 4288 7846
TIME...MOT...LOC 1812Z 236DEG 24KT 4293 7825

$$

NYC037-261830-
/O.CON.KBUF.SV.W.0056.000000T0000Z-090726T1830Z/
GENESEE NY-
214 PM EDT SUN JUL 26 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR GENESEE COUNTY...

AT 210 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. 
THIS STORM WAS LOCATED NEAR ALEXANDER...OR 7 MILES SOUTHWEST OF
BATAVIA...MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BATAVIA BY 220 PM EDT...
  STAFFORD BY 225 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4293 7846 4312 7805 4292 7794 4287 7808
      4288 7809 4288 7846
TIME...MOT...LOC 1812Z 236DEG 24KT 4293 7825

$$

THOMAS
000 
WWUS51 KBUF 261830
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
230 PM EDT SUN JUL 26 2009

NYC037-261839-
/O.EXP.KBUF.SV.W.0056.000000T0000Z-090726T1830Z/
GENESEE NY-
230 PM EDT SUN JUL 26 2009

...THE SEVERE THUNDERSTORM WARNING FOR GENESEE COUNTY HAS EXPIRED AS 
OF 230 PM EDT...

AT 230 PM EDT...NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE 
SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS 
NO LONGER SEVERE...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4293 7846 4312 7805 4292 7794 4287 7808
      4288 7809 4288 7846
TIME...MOT...LOC 1829Z 236DEG 24KT 4299 7812

$$

JJR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 8:00 PM EDTSevere Thunderstorm WarningBUFMonroe, Ontario, Wayne41 min
Jul 25, 8:07 PM EDTSpecial Marine WarningBUF76 min
Jul 25, 9:35 PM EDTSpecial Marine WarningBUF55 min
Jul 26, 3:12 PM EDTSevere Thunderstorm WarningBUFCayuga, Oswego, Wayne50 min
Jul 26, 3:45 PM EDTSpecial Marine WarningBUF57 min
Jul 26, 4:48 PM EDTAreal Flood AdvisoryBUFCayuga, Ontario, Wayne117 min
Jul 26, 5:02 PM EDTSevere Thunderstorm WarningBUFCayuga, Ontario, Wayne58 min
Jul 26, 5:45 PM EDTSevere Thunderstorm WarningBUFCayuga35 min
Jul 26, 6:05 PM EDTSevere Thunderstorm WarningBUFOswego55 min
Jul 26, 6:59 PM EDTTornado WarningBUFCattaraugus46 min
Jul 26, 7:24 PM EDTSpecial Marine WarningBUF48 min
Jul 26, 7:46 PM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus37 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.