Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 84, NWS Buffalo, NY

August 24, 20114 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 24, 2011, 10:34 PM EDT for 4 counties in New York. It was in force for 56 min. 3 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 24, 2011, 10:34 PM EDT (02:34 UTC)
Expired: Aug 24, 2011, 11:30 PM EDT
In force: 56 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY

The radar

The Buffalo radar (KBUF), 75 km from the middle of the area, began a volume at 02:37 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
Aug 24, 10:51 PM EDT	MARINE TSTM WIND 43	Dunkirk, NY
Aug 24, 11:04 PM EDT	TSTM WND DMG	Eden, NY	LARGE TREE DOWN ACROSS NEW JERUSELEM RD
Aug 24, 11:18 PM EDT	TSTM WND DMG	Concord, NY	TREE DOWN ACROSS KAISER RD

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
Aug 24, 9:18 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.6 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-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: 352 J/kg
Mixed-layer CIN: -345 J/kg
Mixed-layer LCL: 1391 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 327 m²/s²
0-3 km storm-relative helicity: 391 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

765 
WUUS51 KBUF 250234
SVRBUF
NYC003-009-013-029-250330-
/O.NEW.KBUF.SV.W.0084.110825T0234Z-110825T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1034 PM EDT WED AUG 24 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ALLEGANY COUNTY IN WESTERN NEW YORK
  CATTARAUGUS COUNTY IN WESTERN NEW YORK
  CHAUTAUQUA COUNTY IN WESTERN NEW YORK
  SOUTHERN ERIE COUNTY IN WESTERN NEW YORK

* UNTIL 1130 PM EDT

* AT 1032 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 16 MILES NORTHWEST OF ANGOLA ON
  THE LAKE TO 10 MILES NORTHWEST OF DUNKIRK...AND MOVING SOUTHEAST 
  AT 50 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  DERBY...
  EDEN...
  NORTH BOSTON...
  BOSTON...
  EAST CONCORD...
  SARDINIA...
  ASHFORD...
  SALAMANCA...
  RUSHFORD...
  OLEAN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THESE STORMS WILL OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM EDT
THURSDAY MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4199 7923 4226 7977 4242 7946 4250 7935
      4256 7916 4271 7904 4275 7890 4228 7799
      4199 7826 4199 7892
TIME...MOT...LOC 0233Z 305DEG 56KT 4281 7924 4260 7944
          4245 7997

$$

TJP

2 follow-up statements

584 
WWUS51 KBUF 250303
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1103 PM EDT WED AUG 24 2011

NYC003-009-013-029-250330-
/O.CON.KBUF.SV.W.0084.000000T0000Z-110825T0330Z/
ALLEGANY NY-CATTARAUGUS NY-CHAUTAUQUA NY-ERIE NY-
1103 PM EDT WED AUG 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR SOUTHERN ERIE...CHAUTAUQUA...CATTARAUGUS AND SOUTHWESTERN
ALLEGANY COUNTIES...

AT 1100 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM EDEN TO PERRYSBURG TO BROCTON...MOVING SOUTHEAST AT 
50 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  SOUTH DAYTON...
  EAST CONCORD...
  DELEVAN...
  ASHFORD...
  SALAMANCA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THESE STORMS WILL OCCUR WELL AHEAD OF ANY RAIN OR 
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER. 
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM EDT
THURSDAY MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4199 7923 4226 7977 4242 7946 4250 7935
      4256 7916 4271 7904 4275 7890 4228 7799
      4199 7826 4199 7892
TIME...MOT...LOC 0302Z 305DEG 56KT 4265 7884 4249 7901
          4237 7939

$$

TJP

954 
WWUS51 KBUF 250330
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1130 PM EDT WED AUG 24 2011

NYC003-009-013-029-250338-
/O.EXP.KBUF.SV.W.0084.000000T0000Z-110825T0330Z/
ALLEGANY NY-CATTARAUGUS NY-CHAUTAUQUA NY-ERIE NY-
1130 PM EDT WED AUG 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ERIE...CHAUTAUQUA...
CATTARAUGUS AND SOUTHWESTERN ALLEGANY COUNTIES WILL EXPIRE AT 1130 PM
EDT...

AT 1128 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAVE WEAKENED AND WERE NO 
LONGER SEVERE...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

HOWEVER...HEAVY RAIN AND GUSTY WINDS ARE STILL POSSIBLE WITH 
THUNDERSTORMS THAT WILL BE MOVING ACROSS THE AREA BETWEEN 1130 PM 
EDT AND 1230 AM EDT.  

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM EDT
THURSDAY MORNING FOR WESTERN NEW YORK.

LAT...LON 4199 7923 4226 7977 4242 7946 4250 7935
      4256 7916 4271 7904 4275 7890 4228 7799
      4199 7826 4199 7892
TIME...MOT...LOC 0328Z 305DEG 56KT 4241 7839 4225 7857
          4214 7895

$$

TJP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 9:47 PM EDT	Special Marine Warning	BUF		58 min
Aug 24, 9:56 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara, Orleans	64 min
Aug 24, 10:06 PM EDT	Special Marine Warning	BUF		54 min
Aug 24, 10:21 PM EDT	Special Marine Warning	BUF		54 min
Aug 24, 10:24 PM EDT	Special Marine Warning	BUF		96 min
Aug 24, 10:37 PM EDT	Special Weather Statement	BUF	Erie	53 min
Aug 24, 10:45 PM EDT	Severe Thunderstorm Warning	BUF	Erie	49 min
Aug 24, 10:54 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Monroe, Orleans	41 min
Aug 24, 11:33 PM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Livingston, Monroe, Ontario, Wayne and 1 more	87 min
Aug 24, 11:38 PM EDT	Special Marine Warning	BUF		52 min
Aug 24, 11:59 PM EDT	Special Marine Warning	BUF		61 min
Aug 25, 12:17 AM EDT	Special Marine Warning	BUF		73 min
Aug 25, 12:22 AM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	53 min
Aug 25, 12:27 AM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Chautauqua	63 min
Aug 25, 12:42 AM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua, Erie	3 hr
Aug 25, 1:06 AM EDT	Special Weather Statement	BUF	Lewis	54 min
Aug 25, 1:17 AM EDT	Special Marine Warning	BUF		58 min
Aug 25, 1:58 AM EDT	Special Weather Statement	BUF	Allegany	62 min
Aug 25, 2:31 AM EDT	Special Weather Statement	BUF	Ontario	59 min
Aug 25, 3:05 AM EDT	Special Weather Statement	BUF	Oswego	55 min
Aug 25, 3:23 AM EDT	Special Weather Statement	BUF	Niagara	52 min
Aug 25, 12:12 PM EDT	Special Weather Statement	BUF	Oswego	63 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.