Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 62, NWS Buffalo, NY

August 4, 2009Erie County, Genesee County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2009, 4:23 PM EDT for Erie County, Genesee County, Wyoming County, New York. It was in force for 52 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
Aug 4, 2009, 4:23 PM EDT (20:23 UTC)
Expired
Aug 4, 2009, 5:15 PM EDT
In force
52 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Erie County, NY, Genesee County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 51 km from the middle of the area, began a volume at 20:23 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 4, 4:28 PM EDTHAIL 1Strykersville, 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, 8.4 hours before the alert went out and 47 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 2009-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 132 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 2009-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.193958Sfc1 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
132 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
57 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.

000 
WUUS51 KBUF 042023
SVRBUF
NYC029-037-121-042115-
/O.NEW.KBUF.SV.W.0062.090804T2023Z-090804T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
423 PM EDT TUE AUG 4 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL ERIE COUNTY IN WESTERN NEW YORK
  SOUTHEASTERN GENESEE COUNTY IN WESTERN NEW YORK
  WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 515 PM EDT

* AT 421 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  SOUTH OF WALES CENTER...OR 7 MILES SOUTHEAST OF EAST AURORA...AND
  MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  VARYSBURG BY 450 PM EDT...
  WARSAW BY 505 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...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 4274 7871 4303 7795 4296 7791 4295 7793
      4291 7793 4291 7795 4269 7795 4264 7797
      4263 7799 4252 7863
TIME...MOT...LOC 2022Z 248DEG 25KT 4268 7855

$$

TJP
2 follow-up statements
000 
WWUS51 KBUF 042044
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
444 PM EDT TUE AUG 4 2009

NYC029-037-121-042115-
/O.CON.KBUF.SV.W.0062.000000T0000Z-090804T2115Z/
WYOMING NY-GENESEE NY-ERIE NY-
444 PM EDT TUE AUG 4 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR EAST CENTRAL ERIE...SOUTHEASTERN GENESEE AND WYOMING COUNTIES...

AT 442 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR VARYSBURG...OR 13 MILES EAST OF EAST AURORA...MOVING
EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  VARYSBURG BY 450 PM EDT...
  WARSAW BY 505 PM EDT...
  WYOMING BY 515 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...HAIL...AND DEADLY CLOUD TO GROUND 
LIGHTNING. THE STORM IS ALSO PRODUCING VERY HEAVY RAIN THAT CAN 
CAUSE PONDING OF WATER ON ROADWAYS AND POOR DRAINAGE FLOODING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A 
STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4274 7871 4303 7795 4296 7791 4295 7793
      4291 7793 4291 7795 4269 7795 4264 7797
      4263 7799 4252 7863
TIME...MOT...LOC 2043Z 248DEG 25KT 4273 7836

$$

TJP
000 
WWUS51 KBUF 042113
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
513 PM EDT TUE AUG 4 2009

NYC029-037-121-042122-
/O.EXP.KBUF.SV.W.0062.000000T0000Z-090804T2115Z/
WYOMING NY-GENESEE NY-ERIE NY-
513 PM EDT TUE AUG 4 2009

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ERIE...
SOUTHEASTERN GENESEE AND WYOMING COUNTIES WILL EXPIRE AT 515 PM
EDT...

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS ARE 
STILL POSSIBLE AS SCATTERED THUNDERSTORMS CONTINUE TO TRACK EAST 
ACROSS SOUTHERN ERIE AND WYOMING COUNTIES THROUGH 6 PM EDT. 

LAT...LON 4274 7871 4303 7795 4296 7791 4295 7793
      4291 7793 4291 7795 4269 7795 4264 7797
      4263 7799 4252 7863
TIME...MOT...LOC 2112Z 248DEG 25KT 4276 7805

$$

TJP

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 5:35 PM EDTSevere Thunderstorm WarningBUFErie, Livingston, Monroe, Ontario, Wyoming55 min
Aug 4, 6:55 PM EDTSpecial Marine WarningBUF65 min
Aug 4, 7:10 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis65 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.