Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Buffalo, NY

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

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 27, 2011, 7:42 PM EDT for Cayuga County, Ontario County, Wayne County, New York. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 27, 2011, 7:42 PM EDT (23:42 UTC)
Expired
Apr 27, 2011, 8:30 PM EDT
In force
48 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Cayuga County, NY, Ontario County, NY, Wayne County, NY

The radar

The Ft Drum radar (KTYX), 117 km from the middle of the area, began a volume at 23:45 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 27, 3:10 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.7 hours before the alert went out and 153 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 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 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
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.

075 
WUUS51 KBUF 272342
SVRBUF
NYC011-069-117-280030-
/O.NEW.KBUF.SV.W.0013.110427T2342Z-110428T0030Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CAYUGA COUNTY IN CENTRAL NEW YORK
  NORTHEASTERN ONTARIO COUNTY IN WESTERN NEW YORK
  WAYNE COUNTY IN WESTERN NEW YORK

* UNTIL 830 PM EDT

* AT 739 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 MARION
  TO 5 MILES NORTHEAST OF PHELPS TO GENEVA...OR ALONG A LINE
  EXTENDING FROM 17 MILES EAST OF FAIRPORT TO 8 MILES NORTHWEST OF
  WATERLOO TO GENEVA...AND MOVING NORTHEAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  CLYDE...
  CATO...
  WEEDSPORT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 4276 7710 4295 7706 4316 7726 4331 7690
      4332 7679 4335 7673 4335 7670 4342 7662
      4325 7660 4326 7649 4304 7650 4301 7695
      4282 7697
TIME...MOT...LOC 2343Z 241DEG 39KT 4314 7705 4301 7693
          4285 7697

$$

HIBBERT
2 follow-up statements
238 
WWUS51 KBUF 280003
SVSBUF

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

NYC069-280013-
/O.CAN.KBUF.SV.W.0013.000000T0000Z-110428T0030Z/
ONTARIO NY-
803 PM EDT WED APR 27 2011

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

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

LAT...LON 4304 7650 4301 7695 4318 7694 4325 7660
      4326 7649
TIME...MOT...LOC 0003Z 241DEG 39KT 4325 7679 4312 7667
          4296 7671

$$

NYC011-117-280030-
/O.CON.KBUF.SV.W.0013.000000T0000Z-110428T0030Z/
WAYNE NY-CAYUGA NY-
803 PM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTH CENTRAL CAYUGA AND SOUTHEASTERN WAYNE COUNTIES...

AT 759 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 NORTH
ROSE TO SAVANNAH TO 9 MILES SOUTH OF SAVANNAH...OR ALONG A LINE
EXTENDING FROM 16 MILES NORTHWEST OF MONTEZUMA TO MONTEZUMA TO
CAYUGA...MOVING NORTHEAST AT 45 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  VICTORY...
  IRA...

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 4304 7650 4301 7695 4318 7694 4325 7660
      4326 7649
TIME...MOT...LOC 0003Z 241DEG 39KT 4325 7679 4312 7667
          4296 7671

$$

HIBBERT
680 
WWUS51 KBUF 280027
SVSBUF

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

NYC011-117-280037-
/O.EXP.KBUF.SV.W.0013.000000T0000Z-110428T0030Z/
WAYNE NY-CAYUGA NY-
827 PM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CAYUGA AND
SOUTHEASTERN WAYNE COUNTIES WILL EXPIRE AT 830 PM EDT...

AT 827 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.

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

LAT...LON 4304 7650 4301 7695 4318 7694 4325 7660
      4326 7649
TIME...MOT...LOC 0027Z 241DEG 39KT 4338 7648 4325 7636
          4309 7640

$$

HIBBERT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 10:21 PM EDTAreal Flood AdvisoryBUFOntario, Wayne3 hr
Apr 27, 1:57 PM EDTGale WarningBUF30 hr
Apr 27, 1:57 PM EDTSmall Craft AdvisoryBUF20 hr
Apr 27, 1:58 PM EDTFlash Flood WatchBUFAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more22 hr
Apr 27, 1:58 PM EDTWind AdvisoryBUFAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more26 hr
Apr 27, 4:25 PM EDTSpecial Marine WarningBUF50 min
Apr 27, 4:49 PM EDTSpecial Weather StatementBUFChautauqua41 min
Apr 27, 5:05 PM EDTSpecial Marine WarningBUF25 min
Apr 27, 5:06 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua, Erie54 min
Apr 27, 5:43 PM EDTTornado WarningBUFAllegany, Cattaraugus32 min
Apr 27, 5:51 PM EDTSpecial Marine WarningBUF84 min
Apr 27, 6:11 PM EDTSpecial Weather StatementBUFGenesee, Livingston, Monroe, Wyoming64 min
Apr 27, 6:17 PM EDTSevere Thunderstorm WarningBUFAllegany, Livingston43 min
Apr 27, 6:52 PM EDTSpecial Weather StatementBUFOntario, Wayne53 min
Apr 27, 6:56 PM EDTSpecial Marine WarningBUF94 min
Apr 27, 6:56 PM EDTSevere Thunderstorm WarningBUFLivingston, Ontario, Wayne49 min
Apr 27, 7:32 PM EDTSevere Thunderstorm WarningBUFOntario13 min
Apr 27, 7:39 PM EDTAreal Flood AdvisoryBUFAllegany, Livingston, Monroe, Ontario, Wayne3 hr

Nearby

Severe Thunderstorm Warnings in New York, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.