Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Buffalo, NY

August 11, 2021Erie County, Genesee County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 11, 2021, 6:40 AM EDT for Erie County, Genesee County, Wyoming County, New York. It was in force for 65 min. 7 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 11, 2021, 6:40 AM EDT (10:40 UTC)
Expired: Aug 11, 2021, 7:45 AM EDT
In force: 65 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Erie County, NY, Genesee County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 23 km from the middle of the area, began a volume at 10:44 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 11, 6:55 AM EDT	TSTM WND GST 61	3 S Buffalo, NY	NYS MESONET SITE AT BUFFALO HARBOR STATE PARK.
Aug 11, 6:56 AM EDT	TSTM WND DMG	1 Se Lackawanna, NY	MULTIPLE BRANCHES DOWN AND DEBRIS ON STREETS. RAILROAD TRACK ARM SNAPPED. LAKE AVE AND MARTIN RD.
Aug 11, 6:56 AM EDT	TSTM WND DMG	1 Se Lackawanna, NY	MULTIPLE BRANCHES DOWN ON LAKE AVE AND MARTIN RD. RAILROAD TRACK ARM SNAPPED.
Aug 11, 7:00 AM EDT	TSTM WND DMG	2 N Lackawanna, NY	LARGE TREE DOWN ON POWER LINES AT AMBER STREET AND SOUTH PARK AVENUE.
Aug 11, 7:00 AM EDT	TSTM WND DMG	2 Nne Lackawanna, NY	LARGE TREE DOWN AND NUMEROUS MEDIUM SIZED BRANCHES DOWN IN CAZENOVIA PARK.
Aug 11, 7:13 AM EDT	TSTM WND DMG	1 Sse Alden, NY	HEAVY PLANTERS KNOCKED OVER AND UMBRELLA AND TABLE THROWN IN STRONG WINDS.
Aug 11, 7:20 AM EDT	TSTM WND DMG	2 S Java Center, NY	MULTIPLE TREES AND POWERLINES DOWN IN THE JAVA AND ARCADE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 10.7 hours before the alert went out and 22 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: 1071 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

268 
WUUS51 KBUF 111040
SVRBUF
NYC029-037-121-111145-
/O.NEW.KBUF.SV.W.0097.210811T1040Z-210811T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
640 AM EDT Wed Aug 11 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Western Wyoming County in western New York...
  Erie County in western New York...
  Southwestern Genesee County in western New York...

* Until 745 AM EDT.

* At 640 AM EDT, a severe thunderstorm was located over Derby, or 7
  miles southwest of Hamburg, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Buffalo, Cheektowaga, West Seneca, Clarence, Lackawanna, Depew,
  Lancaster, Hamburg, East Aurora and Williamsville.

This includes Interstate 90 between exits 57 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4248 7884 4276 7899 4280 7892 4284 7893
      4289 7891 4306 7851 4263 7819
TIME...MOT...LOC 1040Z 243DEG 43KT 4267 7896 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Reynolds

2 follow-up statements

826 
WWUS51 KBUF 111117
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
717 AM EDT Wed Aug 11 2021

NYC029-037-121-111145-
/O.CON.KBUF.SV.W.0097.000000T0000Z-210811T1145Z/
Wyoming NY-Erie NY-Genesee NY-
717 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM EDT
FOR WESTERN WYOMING...EASTERN ERIE AND SOUTHWESTERN GENESEE
COUNTIES...

At 717 AM EDT, a severe thunderstorm was located over Billington
Heights, or over East Aurora, moving northeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Buffalo, Cheektowaga, West Seneca, Clarence, Lackawanna, Depew,
Lancaster, Hamburg, East Aurora and Williamsville.

This includes Interstate 90 between exits 57 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4280 7892 4284 7893 4289 7891 4306 7851
      4263 7819 4254 7861
TIME...MOT...LOC 1117Z 240DEG 21KT 4281 7862 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Apffel

355 
WWUS51 KBUF 111140
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
740 AM EDT Wed Aug 11 2021

NYC029-037-121-111148-
/O.EXP.KBUF.SV.W.0097.000000T0000Z-210811T1145Z/
Wyoming NY-Erie NY-Genesee NY-
740 AM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN WYOMING...EASTERN ERIE
AND SOUTHWESTERN GENESEE COUNTIES WILL EXPIRE AT 745 AM EDT...
        
The storm which prompted the warning has moved out of the area. 
Therefore, the warning will be allowed to expire.

LAT...LON 4280 7892 4284 7893 4289 7891 4306 7851
      4263 7819 4254 7861
TIME...MOT...LOC 1138Z 243DEG 43KT 4292 7832 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:29 PM EDT	Special Weather Statement	BUF	Jefferson	31 min
Aug 10, 10:04 PM EDT	Special Weather Statement	BUF	Lewis	41 min
Aug 10, 10:47 PM EDT	Flash Flood Warning	BUF	Jefferson, Lewis	5 hr
Aug 11, 4:38 AM EDT	Special Weather Statement	BUF	Chautauqua, Erie, Niagara	52 min
Aug 11, 5:37 AM EDT	Special Weather Statement	BUF	Chautauqua	53 min
Aug 11, 5:41 AM EDT	Special Marine Warning	BUF		64 min
Aug 11, 6:09 AM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	51 min
Aug 11, 6:27 AM EDT	Special Marine Warning	BUF		93 min
Aug 11, 6:48 AM EDT	Special Marine Warning	BUF		42 min
Aug 11, 7:16 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Genesee, Livingston, Monroe, Wyoming	59 min
Aug 11, 7:39 AM EDT	Special Weather Statement	BUF	Genesee, Monroe	81 min
Aug 11, 7:46 AM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans	50 min
Aug 11, 7:55 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	50 min
Aug 11, 8:09 AM EDT	Special Marine Warning	BUF		96 min
Aug 11, 8:25 AM EDT	Special Weather Statement	BUF	Wayne	65 min
Aug 11, 9:18 AM EDT	Special Weather Statement	BUF	Oswego	27 min
Aug 11, 1:44 PM EDT	Small Craft Advisory	BUF		6 hr
Aug 11, 6:52 PM EDT	Special Weather Statement	BUF	Chautauqua	38 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

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.