Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 106, NWS Buffalo, NY

September 12, 2021Cattaraugus County, Chautauqua County, Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 12, 2021, 11:00 PM EDT for Cattaraugus County, Chautauqua County, Erie County, New York. It was in force for 75 min. 5 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: Sep 12, 2021, 11:00 PM EDT (03:00 UTC)
Expired: Sep 13, 2021, 12:15 AM EDT
In force: 75 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY

The radar

The Buffalo radar (KBUF), 62 km from the middle of the area, began a volume at 03:03 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 12, 11:48 PM EDT	TSTM WND DMG	Fredonia, NY	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM FREDONIA. MULTIPLE TREES DOWN.
Sep 12, 11:55 PM EDT	TSTM WND DMG	Sinclairville, NY	TREE DOWN ON MOBILE HOME IN SINCLAIRVILLE.
Sep 12, 11:57 PM EDT	TSTM WND DMG	4 Nnw South Dayton, NY	MULTIPLE TREES DOWN. HORSE SHED DESTROYED.
Sep 13, 12:14 AM EDT	TSTM WND DMG	Little Valley, NY	TREE DOWN ON POWERLINE.
Sep 13, 12:22 AM EDT	TSTM WND DMG	Salamanca, NY	TREES DOWN ON ROADWAY.

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 12, 10:25 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 3.0 hours before the alert went out and 62 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: 412 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

924 
WUUS51 KBUF 130300
SVRBUF
NYC009-013-029-130415-
/O.NEW.KBUF.SV.W.0106.210913T0300Z-210913T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1100 PM EDT Sun Sep 12 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Western Cattaraugus County in western New York...
  Erie County in western New York...
  Chautauqua County in western New York...

* Until 1215 AM EDT.

* At 1100 PM EDT, severe thunderstorms were located along a line
  extending from 38 miles northwest of Erie to 32 miles northwest of
  Girard, moving east at 65 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Buffalo, Cheektowaga, West Seneca, Jamestown, Clarence, Lackawanna,
  Kenmore, Depew, Amherst and Tonawanda.

This includes the following highways...
 Interstate 90 between exits 61 and 49.
 Interstate 86 between exits 4 and 21.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4244 7950 4253 7939 4260 7919 4272 7909
      4280 7892 4293 7891 4300 7902 4304 7849
      4246 7850 4200 7875 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 0300Z 275DEG 57KT 4292 8033 4264 8040 4242 8064 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

RSH

1 follow-up statement

967 
WWUS51 KBUF 130323
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1123 PM EDT Sun Sep 12 2021

NYC009-013-029-130415-
/O.CON.KBUF.SV.W.0106.000000T0000Z-210913T0415Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1123 PM EDT Sun Sep 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR WESTERN CATTARAUGUS...ERIE AND CHAUTAUQUA COUNTIES...

At 1122 PM EDT, severe thunderstorms were located along a line
extending from 34 miles northwest of Dunkirk to 22 miles northwest of
Westfield to 15 miles north of Northwest Harborcreek, moving east at
70 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Buffalo, Cheektowaga, West Seneca, Jamestown, Clarence, Lackawanna,
Kenmore, Depew, Amherst and Tonawanda.

This includes the following highways...
 Interstate 90 between exits 61 and 49.
 Interstate 86 between exits 4 and 21.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4244 7950 4253 7939 4260 7919 4272 7909
      4280 7892 4293 7891 4300 7902 4304 7849
      4246 7850 4200 7875 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 0322Z 276DEG 61KT 4287 7976 4259 7983 4237 8007 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 10:53 PM EDT	Special Marine Warning	BUF		82 min
Sep 12, 11:49 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Wyoming	86 min
Sep 13, 12:09 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	66 min
Sep 13, 12:25 AM EDT	Flash Flood Warning	BUF	Erie, Genesee, Wyoming	3 hr
Sep 13, 12:50 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	55 min
Sep 13, 1:09 AM EDT	Special Weather Statement	BUF	Genesee, Monroe, Ontario, Wayne	66 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.