Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 11, NWS Buffalo, NY

April 27, 2011Livingston County, Ontario County, Wayne County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 27, 2011, 6:56 PM EDT for Livingston County, Ontario County, Wayne County, New York. It was in force for 49 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: Apr 27, 2011, 6:56 PM EDT (22:56 UTC)
Expired: Apr 27, 2011, 7:45 PM EDT
In force: 49 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Livingston County, NY, Ontario County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 116 km from the middle of the area, began a volume at 23:00 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
Apr 27, 7:25 PM EDT	TSTM WND DMG	Canandaigua, NY	LINES DOWN AT RT5 AND 20.

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
Apr 27, 3:10 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.9 hours before the alert went out and 113 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: 27 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 139 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.

505 
WUUS51 KBUF 272256
SVRBUF
NYC051-069-117-272345-
/O.NEW.KBUF.SV.W.0011.110427T2256Z-110427T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
656 PM EDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN LIVINGSTON COUNTY IN WESTERN NEW YORK
  ONTARIO COUNTY IN WESTERN NEW YORK
  WAYNE COUNTY IN WESTERN NEW YORK

* UNTIL 745 PM EDT

* AT 655 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 LIMA TO 5 MILES SOUTHWEST OF
  HONEOYE TO 5 MILES SOUTH OF SPRINGWATER...OR ALONG A LINE EXTENDING
  FROM 9 MILES NORTHEAST OF GENESEO TO 13 MILES NORTHEAST OF
  DANSVILLE TO 6 MILES NORTHWEST OF COHOCTON...AND MOVING NORTHEAST
  AT 55 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  BRISTOL...
  VICTOR...
  CANANDAIGUA...
  PALMYRA...
  MARION...
  PHELPS...
  SODUS...
  CLYDE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR WESTERN NEW YORK.

&&

LAT...LON 4258 7766 4265 7765 4281 7776 4295 7756
      4294 7749 4300 7748 4304 7743 4303 7737
      4308 7737 4325 7712 4329 7692 4318 7685
      4301 7687 4300 7695 4289 7695 4275 7716
      4276 7731 4262 7736 4257 7744
TIME...MOT...LOC 2256Z 227DEG 46KT 4286 7763 4272 7754
          4257 7756

$$

HIBBERT

1 follow-up statement

147 
WWUS51 KBUF 272325
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
725 PM EDT WED APR 27 2011

NYC051-272335-
/O.CAN.KBUF.SV.W.0011.000000T0000Z-110427T2345Z/
LIVINGSTON NY-
725 PM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN LIVINGSTON COUNTY IS
CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR WESTERN NEW YORK.

LAT...LON 4276 7731 4300 7748 4303 7737 4308 7737
      4325 7712 4329 7692 4318 7685 4301 7687
      4300 7695 4289 7695 4275 7716
TIME...MOT...LOC 2325Z 227DEG 46KT 4312 7726 4297 7717
          4282 7719

$$

NYC069-117-272345-
/O.CON.KBUF.SV.W.0011.000000T0000Z-110427T2345Z/
ONTARIO NY-WAYNE NY-
725 PM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR WAYNE AND NORTHERN ONTARIO COUNTIES...

AT 719 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM MACEDON
TO SHORTSVILLE TO COTTAGE CITY...OR ALONG A LINE EXTENDING FROM 6
MILES SOUTHEAST OF FAIRPORT TO CANANDAIGUA TO MIDDLESEX...MOVING
NORTHEAST AT 55 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  MARION...
  PHELPS...
  SODUS...
  NORTH ROSE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR WESTERN NEW YORK.

&&

LAT...LON 4276 7731 4300 7748 4303 7737 4308 7737
      4325 7712 4329 7692 4318 7685 4301 7687
      4300 7695 4289 7695 4275 7716
TIME...MOT...LOC 2325Z 227DEG 46KT 4312 7726 4297 7717
          4282 7719

$$

HIBBERT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 10:21 PM EDT	Areal Flood Advisory	BUF	Ontario, Wayne	3 hr
Apr 27, 1:57 PM EDT	Gale Warning	BUF		30 hr
Apr 27, 1:57 PM EDT	Small Craft Advisory	BUF		20 hr
Apr 27, 1:58 PM EDT	Flash Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	22 hr
Apr 27, 1:58 PM EDT	Wind Advisory	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	26 hr
Apr 27, 4:25 PM EDT	Special Marine Warning	BUF		50 min
Apr 27, 4:49 PM EDT	Special Weather Statement	BUF	Chautauqua	41 min
Apr 27, 5:05 PM EDT	Special Marine Warning	BUF		25 min
Apr 27, 5:06 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	54 min
Apr 27, 5:43 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	32 min
Apr 27, 5:51 PM EDT	Special Marine Warning	BUF		84 min
Apr 27, 6:11 PM EDT	Special Weather Statement	BUF	Genesee, Livingston, Monroe, Wyoming	64 min
Apr 27, 6:17 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	43 min
Apr 27, 6:52 PM EDT	Special Weather Statement	BUF	Ontario, Wayne	53 min
Apr 27, 6:56 PM EDT	Special Marine Warning	BUF		94 min
Apr 27, 7:32 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	13 min
Apr 27, 7:39 PM EDT	Areal Flood Advisory	BUF	Allegany, Livingston, Monroe, Ontario, Wayne	3 hr
Apr 27, 7:42 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	48 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.