Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 12, NWS Buffalo, NY

April 27, 2011Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 27, 2011, 7:32 PM EDT for Ontario County, New York. It was in force for 13 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, 7:32 PM EDT (23:32 UTC)
Expired: Apr 27, 2011, 7:45 PM EDT
In force: 13 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Ontario County, NY

The radar

The Buffalo radar (KBUF), 115 km from the middle of the area, began a volume at 23:34 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.

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, 11.5 hours before the alert went out and 111 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.

885 
WUUS51 KBUF 272332
SVRBUF
NYC069-272345-
/O.NEW.KBUF.SV.W.0012.110427T2332Z-110427T2345Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ONTARIO COUNTY IN WESTERN NEW YORK

* UNTIL 745 PM EDT

* AT 729 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
  PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR NAPLES...OR 6 MILES NORTHEAST OF
  COHOCTON...AND MOVING NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

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 THIS STORM.
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 4264 7749 4280 7733 4276 7731 4272 7734
      4267 7735 4266 7736 4258 7735 4257 7737
      4257 7749
TIME...MOT...LOC 2332Z 219DEG 41KT 4259 7739

$$

HIBBERT

1 follow-up statement

936 
WWUS51 KBUF 272344
SVSBUF

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

NYC069-272354-
/O.EXP.KBUF.SV.W.0012.000000T0000Z-110427T2345Z/
ONTARIO NY-
744 PM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ONTARIO COUNTY
WILL EXPIRE AT 745 PM EDT...

AT 744 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 ALLOWED TO EXPIRE.

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

LAT...LON 4264 7749 4280 7733 4276 7731 4272 7734
      4267 7735 4266 7736 4258 7735 4257 7737
      4257 7749
TIME...MOT...LOC 2344Z 219DEG 41KT 4270 7727

$$

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, 6:56 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wayne	49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.