Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 72, NWS Buffalo, NY

August 9, 20096 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 9, 2009, 10:19 PM EDT for 6 counties in New York. It was in force for 71 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, 10:19 PM EDT (02:19 UTC)
Expired: Aug 9, 2009, 11:30 PM EDT
In force: 71 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 45 km from the middle of the area, began a volume at 02:22 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, 10:40 PM EDT	TSTM WND DMG	Strykersville, NY	TWO LARGE OAK TREES...2 TO 3 FEET IN DIAMATER DOWNED
Aug 9, 10:41 PM EDT	TSTM WND DMG	Sheldon Center, NY	TREES/WIRES DOWN
Aug 9, 11:00 PM EDT	MARINE TSTM WIND 44	1 Wnw Dunkirk, NY
Aug 9, 11:05 PM EDT	TSTM WND DMG	Delevan, NY	TREES AND WIRES DOWN
Aug 9, 11:05 PM EDT	TSTM WND DMG	Hanover Center, NY	TREE DOWN
Aug 9, 11:05 PM EDT	TSTM WND DMG	Otto, NY	TREES AND WIRES 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, 8:47 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.3 hours before the alert went out and 44 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: 2759 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 16.6

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBUF 100219
SVRBUF
NYC003-009-013-029-051-121-100330-
/O.NEW.KBUF.SV.W.0072.090810T0219Z-090810T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1019 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ALLEGANY COUNTY IN WESTERN NEW YORK
  NORTHERN CATTARAUGUS COUNTY IN WESTERN NEW YORK
  NORTHERN CHAUTAUQUA COUNTY IN WESTERN NEW YORK
  SOUTHERN ERIE COUNTY IN WESTERN NEW YORK
  SOUTHWESTERN LIVINGSTON COUNTY IN WESTERN NEW YORK
  WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 1130 PM EDT

* AT 1014 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 13 MILES EAST OF BATAVIA TO 5 MILES NORTHWEST OF
  HAMBURG...AND MOVING SOUTHEAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WALES CENTER...NORTH BOSTON AND LAKE ERIE BEACH BY 1025 PM EDT...
  VARYSBURG...COLDEN AND EDEN BY 1030 PM EDT...
  DUNKIRK...BOSTON AND WARSAW BY 1035 PM EDT...
  JAVA CENTER BY 1040 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT MONDAY
MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4250 7936 4257 7916 4271 7905 4276 7891
      4279 7795 4235 7800 4235 7957
TIME...MOT...LOC 0219Z 347DEG 31KT 4293 7791 4273 7890

$$

TMA

1 follow-up statement

000 
WWUS51 KBUF 100301
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1101 PM EDT SUN AUG 9 2009

NYC003-009-013-029-051-121-100330-
/O.CON.KBUF.SV.W.0072.000000T0000Z-090810T0330Z/
CHAUTAUQUA NY-CATTARAUGUS NY-ALLEGANY NY-WYOMING NY-LIVINGSTON NY-
ERIE NY-
1101 PM EDT SUN AUG 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR SOUTHERN ERIE...EXTREME SOUTHWESTERN LIVINGSTON...WYOMING...
NORTHWESTERN ALLEGANY...NORTHERN CATTARAUGUS AND NORTHERN CHAUTAUQUA
COUNTIES...

AT 1100 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM PORTAGEVILLE TO ASHFORD HOLLOW TO FREDONIA...MOVING 
SOUTH AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  RUSHFORD AND SOUTH DAYTON AND HOUGHTON BY 1110 PM EDT...
  CANEADEA BY 1115 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT MONDAY
MORNING FOR WESTERN NEW YORK.

&&

LAT...LON 4250 7936 4257 7916 4271 7905 4276 7891
      4279 7795 4235 7800 4235 7957
TIME...MOT...LOC 0301Z 347DEG 31KT 4256 7799 4238 7858
          4244 7933

$$

TMA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 8:04 PM EDT	Flash Flood Warning	BUF	Wayne	3 hr
Aug 9, 8:41 PM EDT	Special Marine Warning	BUF		94 min
Aug 9, 8:58 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Monroe, Niagara, Orleans	92 min
Aug 9, 9:17 PM EDT	Flash Flood Warning	BUF	Cayuga, Wayne	3 hr
Aug 9, 9:28 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans, Wyoming	77 min
Aug 9, 9:44 PM EDT	Special Marine Warning	BUF		91 min
Aug 9, 10:08 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wyoming	67 min
Aug 9, 10:28 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Ontario, Wayne	65 min
Aug 9, 10:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Ontario and 1 more	70 min
Aug 9, 10:59 PM EDT	Flash Flood Warning	BUF	Wayne	64 min
Aug 9, 11:18 PM EDT	Special Marine Warning	BUF		57 min
Aug 9, 11:26 PM EDT	Flash Flood Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie	3 hr
Aug 10, 12:01 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua	59 min
Aug 10, 12:56 AM EDT	River Flood Warning	BUF	Cattaraugus, Chautauqua, Erie, Wyoming	13 hr
Aug 10, 3:18 AM EDT	River Flood Warning	BUF	Erie	10 hr
Aug 10, 4:25 AM EDT	Flash Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 7 more	17 hr
Aug 10, 4:40 AM EDT	Small Craft Advisory	BUF		10 hr
Aug 10, 5:15 AM EDT	Flash Flood Warning	BUF	Genesee, Niagara, Orleans	109 min
Aug 10, 6:02 AM EDT	Flash Flood Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans, Wayne	109 min
Aug 10, 6:38 AM EDT	Special Marine Warning	BUF		52 min
Aug 10, 6:43 AM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
Aug 10, 9:33 AM EDT	River Flood Warning	BUF	Erie, Wyoming	4 hr
Aug 10, 2:40 PM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	55 min
Aug 10, 2:52 PM EDT	Flash Flood Warning	BUF	Chautauqua	76 min
Aug 10, 3:17 PM EDT	Severe Thunderstorm Warning	BUF	Wayne	58 min
Aug 10, 3:46 PM EDT	Areal Flood Advisory	BUF	Wayne	6 hr
Aug 10, 4:13 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga	20 min
Aug 10, 4:50 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	30 min
Aug 10, 5:08 PM EDT	Flash Flood Warning	BUF	Niagara	45 min
Aug 10, 5:12 PM EDT	Special Marine Warning	BUF		40 min
Aug 10, 5:45 PM EDT	Special Marine Warning	BUF		99 min
Aug 10, 6:21 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	54 min
Aug 10, 6:50 PM EDT	Severe Thunderstorm Warning	BUF	Wayne	55 min
Aug 10, 7:00 PM EDT	Special Marine Warning	BUF		43 min
Aug 10, 7:08 PM EDT	Flash Flood Warning	BUF	Wayne	3 hr
Aug 10, 7:41 PM EDT	Flash Flood Warning	BUF	Cayuga	3 hr

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.