Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 27, NWS Buffalo, NY

May 29, 20114 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 29, 2011, 10:21 PM EDT for 4 counties in New York. It was in force for 34 min. 2 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: May 29, 2011, 10:21 PM EDT (02:21 UTC)
Expired: May 29, 2011, 10:55 PM EDT
In force: 34 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Allegany County, NY, Genesee County, NY, Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 54 km from the middle of the area, began a volume at 02:21 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

Time	Report	Where	Remark
May 29, 10:30 PM EDT	TSTM WND DMG	Eagle, NY	TREES DOWN.
May 29, 10:30 PM EDT	TSTM WND DMG	Sheldon, NY	TREES DOWN.

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.

Issued	Product	Office	Lasted
May 29, 8:52 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.4 hours before the alert went out and 50 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1339 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

867 
WUUS51 KBUF 300221
SVRBUF
NYC003-037-051-121-300315-
/O.NEW.KBUF.SV.W.0027.110530T0221Z-110530T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1021 PM EDT SUN MAY 29 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 1115 PM EDT

* AT 1016 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM BENNINGTON TO BLISS...AND MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  ATTICA...
  PORTAGEVILLE...
  PAVILION...
  GROVELAND...
  YORK...

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.

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM EDT MONDAY
MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4248 7830 4252 7832 4252 7837 4287 7847
      4289 7846 4299 7777 4247 7772
TIME...MOT...LOC 0221Z 237DEG 29KT 4288 7835 4255 7827

$$

TMA

1 follow-up statement

477 
WWUS51 KBUF 300255
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1055 PM EDT SUN MAY 29 2011

NYC003-037-051-121-300304-
/O.CAN.KBUF.SV.W.0027.000000T0000Z-110530T0315Z/
ALLEGANY NY-GENESEE NY-LIVINGSTON NY-WYOMING NY-
1055 PM EDT SUN MAY 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR WYOMING...WESTERN
LIVINGSTON...SOUTHERN GENESEE AND NORTHERN ALLEGANY COUNTIES IS
CANCELLED...

AT 1054 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD EXITED THE WARNED 
AREA...THUS THE WARNING HAS BEEN CANCELLED. OTHER WARNINGS REMAIN IN 
EFFECT WHERE THE STORMS HAVE MOVED INTO.

LAT...LON 4248 7830 4252 7832 4252 7837 4287 7847
      4289 7846 4299 7777 4247 7772
TIME...MOT...LOC 0254Z 237DEG 29KT 4302 7804 4269 7797

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 8:03 PM EDT	Special Marine Warning	BUF		87 min
May 29, 8:34 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	56 min
May 29, 8:58 PM EDT	Special Marine Warning	BUF		62 min
May 29, 9:17 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	58 min
May 29, 9:24 PM EDT	Special Weather Statement	BUF	Erie, Niagara	51 min
May 29, 9:42 PM EDT	Special Marine Warning	BUF		33 min
May 29, 9:57 PM EDT	Special Marine Warning	BUF		63 min
May 29, 10:04 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	56 min
May 29, 10:18 PM EDT	Special Weather Statement	BUF	Genesee, Livingston, Monroe, Orleans, Wyoming	57 min
May 29, 10:27 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans	63 min
May 29, 10:30 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	26 min
May 29, 10:41 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Ontario, Wyoming	50 min
May 29, 10:57 PM EDT	Special Marine Warning	BUF		63 min
May 29, 11:13 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Ontario, Wayne	62 min
May 29, 11:39 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	66 min
May 29, 11:44 PM EDT	Special Marine Warning	BUF		46 min
May 30, 12:31 AM EDT	Special Weather Statement	BUF	Lewis	74 min

Nearby

Severe Thunderstorm Warnings in New York, 2011 Every 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.