Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 66, NWS Buffalo, NY

August 9, 20096 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 9, 2009, 12:51 PM EDT for 6 counties in New York. It was in force for 54 min. 6 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: Aug 9, 2009, 12:51 PM EDT (16:51 UTC)
Expired: Aug 9, 2009, 1:45 PM EDT
In force: 54 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Cattaraugus County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 26 km from the middle of the area, began a volume at 16:51 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
Aug 9, 1:15 PM EDT	TSTM WND DMG	East Aurora, NY	WIRES DOWN
Aug 9, 1:20 PM EDT	TSTM WND DMG	Hamburg, NY	WIRES DOWN
Aug 9, 1:22 PM EDT	TSTM WND DMG	Eden, NY	TREE DOWN
Aug 9, 1:31 PM EDT	TSTM WND DMG	5 S Warsaw, NY	TREE DOWN
Aug 9, 1:40 PM EDT	TSTM WND DMG	Java Center, NY	TREE DOWN
Aug 9, 1:50 PM EDT	TSTM WND DMG	3 W Springville, NY	SEVERAL TREES 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
Aug 9, 11:57 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 4.9 hours before the alert went out and 24 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: 913 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 495 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KBUF 091651
SVRBUF
NYC009-029-037-051-055-121-091745-
/O.NEW.KBUF.SV.W.0066.090809T1651Z-090809T1745Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1251 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CATTARAUGUS COUNTY IN WESTERN NEW YORK
  ERIE COUNTY IN WESTERN NEW YORK
  GENESEE COUNTY IN WESTERN NEW YORK
  NORTH CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK
  SOUTHWESTERN MONROE COUNTY IN WESTERN NEW YORK
  WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 145 PM EDT

* AT 1247 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORM THAT EXTENDED FROM LONG POINT ONTARIO  
  ACROSS NORTHERN ERIE COUNTY TO ALBION IN ORLEANS COUNTY. THE       
  ACTIVITY WAS MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BATAVIS BY 100 PM EDT...  
  EDEN BY 105 PM EDT...
  BOSTON BY 130 PM EDT...
  EAST CONCORD BY 145 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4251 7906 4254 7905 4258 7915 4263 7911
      4273 7901 4275 7892 4279 7887 4291 7890
      4296 7881 4289 7872 4313 7791 4278 7770
      4241 7896
TIME...MOT...LOC 1648Z 291DEG 18KT 4266 7901

$$

NIZIOL

1 follow-up statement

000 
WWUS51 KBUF 091718
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
118 PM EDT SUN AUG 9 2009

NYC055-091726-
/O.CAN.KBUF.SV.W.0066.000000T0000Z-090809T1745Z/
MONROE NY-
118 PM EDT SUN AUG 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MONROE COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

LAT...LON 4241 7896 4251 7906 4254 7905 4258 7915
      4273 7901 4275 7892 4279 7887 4285 7887
      4288 7880 4288 7873 4302 7799 4278 7770
TIME...MOT...LOC 1716Z 291DEG 18KT 4261 7883

$$

NYC009-029-037-051-121-091745-
/O.CON.KBUF.SV.W.0066.000000T0000Z-090809T1745Z/
CATTARAUGUS NY-WYOMING NY-LIVINGSTON NY-GENESEE NY-ERIE NY-
118 PM EDT SUN AUG 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT
FOR ERIE...SOUTHERN GENESEE...CENTRAL LIVINGSTON...WYOMING AND
NORTHWESTERN CATTARAUGUS COUNTIES...

AT 115 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS RAN FROM CENTRAL ERIE COUNTY 
EASTWARD TO THE GENESEE WYOMING COUNTY BORDER. THEY WERE MOVING 
SOUTH SOUTHEAST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4241 7896 4251 7906 4254 7905 4258 7915
      4273 7901 4275 7892 4279 7887 4285 7887
      4288 7880 4288 7873 4302 7799 4278 7770
TIME...MOT...LOC 1716Z 291DEG 18KT 4261 7883

$$

SAGE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:05 AM EDT	Small Craft Advisory	BUF		5 hr
Aug 9, 11:56 AM EDT	Special Marine Warning	BUF		42 min
Aug 9, 12:07 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	53 min
Aug 9, 12:46 PM EDT	Special Marine Warning	BUF		59 min
Aug 9, 1:35 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 3 more	55 min
Aug 9, 1:42 PM EDT	Special Marine Warning	BUF		33 min
Aug 9, 1:57 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Livingston	63 min
Aug 9, 2:07 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	39 min
Aug 9, 2:18 PM EDT	Flash Flood Warning	BUF	Allegany, Cattaraugus, Chautauqua	84 min

Nearby

Severe Thunderstorm Warnings in New York, 2009 Every severe thunderstorm warning in 2009

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.