Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 73, NWS Buffalo, NY

August 9, 2009Monroe County, Ontario County, Wayne County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 9, 2009, 10:28 PM EDT for Monroe County, Ontario County, Wayne County, New York. It was in force for 65 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: Aug 9, 2009, 10:28 PM EDT (02:28 UTC)
Expired: Aug 9, 2009, 11:33 PM EDT
In force: 65 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Monroe County, NY, Ontario County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 128 km from the middle of the area, began a volume at 02:31 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, 10:42 PM EDT	TSTM WND DMG	Ontario, NY	WIRE 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, 2.5 hours before the alert went out and 125 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 100228
SVRBUF
NYC055-069-117-100345-
/O.NEW.KBUF.SV.W.0073.090810T0228Z-090810T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1028 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MONROE COUNTY IN WESTERN NEW YORK
  ONTARIO COUNTY IN WESTERN NEW YORK
  WAYNE COUNTY IN WESTERN NEW YORK

* UNTIL 1145 PM EDT

* AT 1024 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 6 MILES NORTHWEST OF ONTARIO TO 7 MILES WEST OF
  FAIRPORT TO 28 MILES WEST OF BRISTOL...AND MOVING SOUTHEAST AT 40 
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ONTARIO AND FAIRPORT BY 1035 PM EDT...
  WILLIAMSON BY 1040 PM EDT...
  SODUS BY 1045 PM EDT...
  MARION...VICTOR AND PALMYRA BY 1050 PM EDT...
  NEWARK BY 1100 PM EDT...
  BRISTOL AND LYONS BY 1105 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 4286 7749 4328 7742 4330 7715 4328 7697
      4331 7691 4331 7672 4303 7671 4300 7696
      4277 7697 4276 7731 4269 7736 4259 7736
      4258 7749
TIME...MOT...LOC 0227Z 286DEG 35KT 4329 7731 4310 7754
          4293 7794

$$

TMA

1 follow-up statement

000 
WWUS51 KBUF 100333
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1133 PM EDT SUN AUG 9 2009

NYC055-069-117-100343-
/O.CAN.KBUF.SV.W.0073.000000T0000Z-090810T0345Z/
ONTARIO NY-WAYNE NY-MONROE NY-
1133 PM EDT SUN AUG 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE...WAYNE
AND ONTARIO COUNTIES IS CANCELLED...

AT 1133 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE LINE 
OF SEVERE THUNDERSTORMS THAT PROMPTED THE WARNING HAD EXITED THE 
WARNED AREA...THUS THE WARNING HAS BEEN CANCELLED.

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

LAT...LON 4286 7749 4328 7742 4330 7715 4328 7697
      4331 7691 4331 7672 4303 7671 4300 7696
      4277 7697 4276 7731 4269 7736 4259 7736
      4258 7749
TIME...MOT...LOC 0333Z 286DEG 35KT 4311 7646 4292 7669
          4275 7709

$$

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, 10:19 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Wyoming	71 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.