Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 91, NWS Buffalo, NY

September 4, 20115 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 4, 2011, 4:41 AM EDT for 5 counties in New York. It was in force for 45 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: Sep 4, 2011, 4:41 AM EDT (08:41 UTC)
Expired: Sep 4, 2011, 5:26 AM EDT
In force: 45 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Erie County, NY, Genesee County, NY, Monroe County, NY, Niagara County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 50 km from the middle of the area, began a volume at 08:41 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
Sep 4, 4:50 AM EDT	TSTM WND DMG	1 Se Thirty Mile Point, NY	AWNING TORN OFF OF RV AND SEVERAL COLLAPSED TENTS REPORTED AT GOLDEN HILL STATE PARK.

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
Sep 4, 3:26 AM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 8.7 hours before the alert went out and 49 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: 889 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1459 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 86 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.

134 
WUUS51 KBUF 040841
SVRBUF
NYC029-037-055-063-073-041000-
/O.NEW.KBUF.SV.W.0091.110904T0841Z-110904T1000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
441 AM EDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ERIE COUNTY IN WESTERN NEW YORK
  NORTHERN GENESEE COUNTY IN WESTERN NEW YORK
  NORTHWESTERN MONROE COUNTY IN WESTERN NEW YORK
  EASTERN NIAGARA COUNTY IN WESTERN NEW YORK
  ORLEANS COUNTY IN WESTERN NEW YORK

* UNTIL 600 AM EDT

* AT 436 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 16 MILES NORTHWEST OF AKRON...OR
  NEAR LOCKPORT...AND MOVING NORTHEAST AT 45 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO 60 MPH WERE REPORTED IN NIAGARA FALLS. THIS IS 
A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY AWAY FROM WINDOWS!

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
SUNDAY MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4289 7851 4323 7852 4336 7851 4337 7849
      4338 7846 4339 7808 4335 7775 4329 7766
      4307 7801
TIME...MOT...LOC 0840Z 237DEG 40KT 4315 7872

$$

APFFEL

2 follow-up statements

853 
WWUS51 KBUF 040910
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
510 AM EDT SUN SEP 4 2011

NYC029-063-040919-
/O.CAN.KBUF.SV.W.0091.000000T0000Z-110904T1000Z/
NIAGARA NY-ERIE NY-
510 AM EDT SUN SEP 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ERIE AND EASTERN
NIAGARA COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
SUNDAY MORNING FOR WESTERN NEW YORK.

LAT...LON 4338 7845 4338 7801 4335 7783 4335 7775
      4329 7766 4307 7801 4303 7812 4317 7834
      4332 7847
TIME...MOT...LOC 0909Z 239DEG 56KT 4330 7798

$$

NYC037-055-073-041000-
/O.CON.KBUF.SV.W.0091.000000T0000Z-110904T1000Z/
GENESEE NY-ORLEANS NY-MONROE NY-
510 AM EDT SUN SEP 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 AM EDT
FOR NORTHWESTERN MONROE...ORLEANS AND NORTHEASTERN GENESEE
COUNTIES...

AT 503 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS 
IN EXCESS OF 60 MPH.  THE STRONGEST WINDS ARE LOCATED WELL OUT AHEAD 
OF THE LINE OF STORMS. THIS GUST FRONT IS LOCATED ALONG THE ORLEANS 
AND MONROE COUNTY LINE OR NEAR KENDALL...MOVING NORTHEAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THIS STORM 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 1100 AM EDT
SUNDAY MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4338 7845 4338 7801 4335 7783 4335 7775
      4329 7766 4307 7801 4303 7812 4317 7834
      4332 7847
TIME...MOT...LOC 0909Z 239DEG 56KT 4330 7798

$$

APFFEL

243 
WWUS51 KBUF 040926
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
526 AM EDT SUN SEP 4 2011

NYC037-055-073-040935-
/O.CAN.KBUF.SV.W.0091.000000T0000Z-110904T1000Z/
GENESEE NY-ORLEANS NY-MONROE NY-
526 AM EDT SUN SEP 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONROE...ORLEANS
AND NORTHEASTERN GENESEE COUNTIES IS CANCELLED...

AT 525 AM 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
SUNDAY MORNING FOR WESTERN NEW YORK.

LAT...LON 4338 7845 4338 7801 4335 7783 4335 7775
      4329 7766 4307 7801 4303 7812 4317 7834
      4332 7847
TIME...MOT...LOC 0925Z 239DEG 56KT 4343 7768

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 8:59 PM EDT	Special Weather Statement	BUF	Allegany	46 min
Sep 3, 9:04 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	41 min
Sep 4, 3:00 AM EDT	Special Marine Warning	BUF		90 min
Sep 4, 3:21 AM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	54 min
Sep 4, 3:39 AM EDT	Special Marine Warning	BUF		81 min
Sep 4, 3:49 AM EDT	Special Marine Warning	BUF		56 min
Sep 4, 3:55 AM EDT	Special Weather Statement	BUF	Erie	65 min
Sep 4, 4:09 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	57 min
Sep 4, 4:11 AM EDT	Special Marine Warning	BUF		61 min
Sep 4, 4:46 AM EDT	Special Marine Warning	BUF		70 min
Sep 4, 5:20 AM EDT	Special Weather Statement	BUF	Chautauqua	40 min
Sep 4, 6:40 AM EDT	Special Marine Warning	BUF		80 min
Sep 4, 7:31 AM EDT	Special Weather Statement	BUF	Jefferson	44 min
Sep 4, 7:57 AM EDT	Special Marine Warning	BUF		63 min
Sep 4, 3:41 PM EDT	Special Marine Warning	BUF		64 min
Sep 4, 4:53 PM EDT	Special Weather Statement	BUF	Allegany, Livingston, Ontario, Wyoming	67 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.