Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 30, NWS Buffalo, NY

May 29, 20114 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 29, 2011, 10:41 PM EDT for 4 counties in New York. It was in force for 50 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, 10:41 PM EDT (02:41 UTC)
Expired: May 29, 2011, 11:31 PM EDT
In force: 50 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Genesee County, NY, Livingston County, NY, Ontario County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 99 km from the middle of the area, began a volume at 02:40 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, 11:06 PM EDT	TSTM WND DMG	Wayland, NY	TREES DOWN
May 29, 11:15 PM EDT	TSTM WND DMG	Canandaigua, NY	TREES AND WIRES 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, 2.7 hours before the alert went out and 95 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.

260 
WUUS51 KBUF 300241
SVRBUF
NYC037-051-069-121-300345-
/O.NEW.KBUF.SV.W.0030.110530T0241Z-110530T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1041 PM EDT SUN MAY 29 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GENESEE COUNTY IN WESTERN NEW YORK
  LIVINGSTON COUNTY IN WESTERN NEW YORK
  WESTERN ONTARIO COUNTY IN WESTERN NEW YORK
  NORTHEASTERN WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 1145 PM EDT

* AT 1035 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM YORK TO 10 MILES SOUTHWEST OF DANSVILLE...AND
  MOVING EAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  HEMLOCK...
  SPRINGWATER...
  HONEOYE...
  BRISTOL...
  CANANDAIGUA...

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 WIDESPREAD WIND DAMAGE 
ACROSS WYOMING COUNTY. THIS IS AN EXTREMELY DANGEROUS SITUATION. 
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 7784 4251 7784 4252 7789 4291 7805
      4295 7717 4276 7715 4275 7731 4266 7736
      4257 7737 4257 7765 4253 7767 4253 7771
      4247 7772
TIME...MOT...LOC 0241Z 257DEG 41KT 4295 7780 4247 7775

$$

TMA

3 follow-up statements

829 
WWUS51 KBUF 300303 RRA
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1103 PM EDT SUN MAY 29 2011

NYC037-051-069-121-300345-
/O.CON.KBUF.SV.W.0030.000000T0000Z-110530T0345Z/
GENESEE NY-LIVINGSTON NY-ONTARIO NY-WYOMING NY-
1103 PM EDT SUN MAY 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR NORTHEASTERN WYOMING...WESTERN ONTARIO...LIVINGSTON AND
SOUTHEASTERN GENESEE COUNTIES...

AT 1100 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM IONIA TO 8 MILES SOUTHWEST OF NAPLES...OR
ALONG A LINE EXTENDING FROM 8 MILES SOUTHWEST OF FAIRPORT TO
COHOCTON...MOVING EAST AT 45 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  CANANDAIGUA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4248 7784 4251 7784 4252 7789 4291 7805
      4295 7717 4276 7715 4275 7731 4266 7736
      4257 7737 4257 7765 4253 7767 4253 7771
      4247 7772
TIME...MOT...LOC 0301Z 257DEG 41KT 4300 7749 4252 7745

$$

SFM

844 
WWUS51 KBUF 300317
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1117 PM EDT SUN MAY 29 2011

NYC037-051-121-300326-
/O.CAN.KBUF.SV.W.0030.000000T0000Z-110530T0345Z/
GENESEE NY-LIVINGSTON NY-WYOMING NY-
1117 PM EDT SUN MAY 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WYOMING...
LIVINGSTON AND SOUTHEASTERN GENESEE COUNTIES IS CANCELLED...

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

LAT...LON 4257 7749 4268 7748 4291 7754 4295 7717
      4276 7715 4275 7731 4266 7736 4257 7737
TIME...MOT...LOC 0316Z 257DEG 41KT 4303 7726 4255 7722

$$

NYC069-300345-
/O.CON.KBUF.SV.W.0030.000000T0000Z-110530T0345Z/
ONTARIO NY-
1117 PM EDT SUN MAY 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR WESTERN ONTARIO COUNTY...

AT 1114 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 10 MILES NORTH OF CANANDAIGUA TO
9 MILES SOUTHEAST OF NAPLES...OR ALONG A LINE EXTENDING FROM 9 MILES
SOUTHEAST OF FAIRPORT TO 10 MILES NORTH OF HAMMONDSPORT...MOVING EAST
AT 45 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  RURAL ONTARIO COUNTY.

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.

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

&&

LAT...LON 4257 7749 4268 7748 4291 7754 4295 7717
      4276 7715 4275 7731 4266 7736 4257 7737
TIME...MOT...LOC 0316Z 257DEG 41KT 4303 7726 4255 7722

$$

APFFEL

076 
WWUS51 KBUF 300331
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1131 PM EDT SUN MAY 29 2011

NYC069-300341-
/O.CAN.KBUF.SV.W.0030.000000T0000Z-110530T0345Z/
ONTARIO NY-
1131 PM EDT SUN MAY 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ONTARIO COUNTY IS
CANCELLED...

AT 1131 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.

LAT...LON 4257 7749 4268 7748 4291 7754 4295 7717
      4276 7715 4275 7731 4266 7736 4257 7737
TIME...MOT...LOC 0331Z 257DEG 41KT 4303 7701 4255 7699

$$

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, 10:21 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Genesee, Livingston, Wyoming	34 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, 10:57 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.