Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 123, NWS Buffalo, NY

September 4, 2017Cattaraugus County, Chautauqua County, Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 4, 2017, 10:12 PM EDT for Cattaraugus County, Chautauqua County, Erie County, New York. It was in force for 63 min. 19 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 4, 2017, 10:12 PM EDT (02:12 UTC)
Expired: Sep 4, 2017, 11:15 PM EDT
In force: 63 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 65 km from the middle of the area, began a volume at 02:10 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 4, 10:24 PM EDT	TSTM WND DMG	Ripley, NY	TREES DOWN.
Sep 4, 10:28 PM EDT	TSTM WND DMG	3 Nne Westfield, NY	GARAGE LIFTED OFF FOUNDATION AND TREES DOWN.
Sep 4, 10:30 PM EDT	TSTM WND DMG	Westfield, NY	TREES DOWN ON RT 20.
Sep 4, 10:33 PM EDT	TSTM WND DMG	Silver Creek, NY	TREE ON A HOUSE.
Sep 4, 10:34 PM EDT	TSTM WND DMG	1 Se Brocton, NY	MAYOR OF BROCTON REPORTED EIGHT TREES DOWN IN A ROW.
Sep 4, 10:40 PM EDT	TSTM WND GST 60	2 Sw Fredonia, NY
Sep 4, 10:40 PM EDT	TSTM WND GST 61	2 Sw Fredonia, NY
Sep 4, 10:40 PM EDT	NON-TSTM WND GST 60	2 Sw Fredonia, NY	MESONET
Sep 4, 10:45 PM EDT	TSTM WND GST 59	Dunkirk Airport, NY
Sep 4, 10:50 PM EDT	NON-TSTM WND GST 61	2 Wsw Fredonia, NY
Sep 4, 10:51 PM EDT	TSTM WND DMG	2 Nne Cherry Creek, NY	TREES DOWN.
Sep 4, 10:51 PM EDT	TSTM WND DMG	Cherry Creek, NY	TREES AND WIRES DOWN
Sep 4, 10:54 PM EDT	TSTM WND DMG	Perrysburg, NY	TREES AND WIRES DOWN ON RTE 39
Sep 4, 10:56 PM EDT	TSTM WND DMG	Dayton, NY	TREES DOWN
Sep 4, 10:56 PM EDT	TSTM WND DMG	Gowanda, NY	MULTIPLE TREES DOWN IN GOWANDA.
Sep 4, 11:08 PM EDT	TSTM WND DMG	Concord, NY	TREES DOWN
Sep 4, 11:10 PM EDT	TSTM WND DMG	East Aurora, NY	LARGE TREE BRANCH ACROSS RD IN VILLAGE
Sep 4, 11:10 PM EDT	TSTM WND DMG	Springville, NY	TREES DOWN IN SPRINGVILLE
Sep 4, 11:20 PM EDT	NON-TSTM WND GST 61	2 Wsw Fredonia, NY

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, 2.2 hours before the alert went out and 65 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: 94 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1561 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 515 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

131 
WUUS51 KBUF 050212
SVRBUF
NYC009-013-029-050315-
/O.NEW.KBUF.SV.W.0123.170905T0212Z-170905T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1012 PM EDT MON SEP 4 2017

The National Weather Service in Buffalo has issued a

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

* until 1115 PM EDT.

* At 1011 PM EDT, severe thunderstorms were located along a line
  extending from 14 miles northwest of Westfield to 8 miles northwest
  of Northwest Harborcreek, moving east at 70 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Buffalo, West Seneca, Lackawanna, Dunkirk, Fredonia, Hamburg, East
  Aurora and Evans.

This includes Interstate 90 between exits 61 and 55.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This storm has shown some rotation on radar. While not 
imminent, severe thunderstorms can produce tornadoes.

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
      4276 7898 4281 7892 4287 7867 4268 7849
      4217 7876 4217 7976 4227 7976 4228 7973
      4231 7976
TIME...MOT...LOC 0211Z 262DEG 63KT 4250 7971 4226 8007 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

HITCHCOCK

3 follow-up statements

793 
WWUS51 KBUF 050243
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1043 PM EDT MON SEP 4 2017

NYC009-013-029-050315-
/O.CON.KBUF.SV.W.0123.000000T0000Z-170905T0315Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1043 PM EDT MON SEP 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR NORTHWESTERN CATTARAUGUS...SOUTHERN ERIE AND CHAUTAUQUA
COUNTIES...

At 1042 PM EDT, severe thunderstorms were located along a line
extending from near Evangola State Park to 7 miles north of Long
Point State Park, moving east at 65 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Buffalo, West Seneca, Lackawanna, Dunkirk, Fredonia, Hamburg, East
Aurora and Evans.

This includes Interstate 90 between exits 61 and 55.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This storm has shown some rotation on radar. While not 
imminent, severe thunderstorms can produce tornadoes.

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
      4276 7898 4281 7892 4287 7867 4268 7849
      4217 7876 4217 7976 4227 7976 4228 7973
      4231 7976
TIME...MOT...LOC 0242Z 265DEG 56KT 4258 7909 4228 7936 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

HITCHCOCK

898 
WWUS51 KBUF 050303
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1103 PM EDT MON SEP 4 2017

NYC009-013-029-050315-
/O.CON.KBUF.SV.W.0123.000000T0000Z-170905T0315Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1103 PM EDT MON SEP 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR NORTHWESTERN CATTARAUGUS...SOUTHERN ERIE AND EAST CENTRAL
CHAUTAUQUA COUNTIES...

At 1102 PM EDT, severe thunderstorms were located along a line
extending from near Orchard Park to 8 miles south of Gowanda, moving
east at 65 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
West Seneca, Lackawanna, Hamburg, East Aurora, Boston, Eden,
Springville and Colden.

This includes Interstate 90 between exits 57 and 55.
 
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 4217 7914 4238 7918 4248 7909 4283 7883
      4287 7867 4268 7849 4217 7876
TIME...MOT...LOC 0302Z 250DEG 58KT 4272 7874 4234 7890 

HAIL...<.75IN
WIND...60MPH
 
$$

HITCHCOCK

296 
WWUS51 KBUF 050312
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1112 PM EDT MON SEP 4 2017

NYC009-013-029-050321-
/O.EXP.KBUF.SV.W.0123.000000T0000Z-170905T0315Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1112 PM EDT MON SEP 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CATTARAUGUS...
SOUTHERN ERIE AND EAST CENTRAL CHAUTAUQUA COUNTIES WILL EXPIRE AT
1115 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 4217 7914 4238 7918 4248 7909 4283 7883
      4287 7867 4268 7849 4217 7876
TIME...MOT...LOC 0311Z 262DEG 63KT 4274 7854 4236 7870 

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 9:47 PM EDT	Special Marine Warning	BUF		88 min
Sep 4, 10:20 PM EDT	Special Weather Statement	BUF	Erie, Genesee, Wyoming	40 min
Sep 4, 10:24 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Orleans, Wyoming	32 min
Sep 4, 10:55 PM EDT	Beach Hazards Statement	BUF	Cayuga, Jefferson, Oswego	12 hr
Sep 4, 10:59 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	61 min
Sep 4, 11:06 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	39 min
Sep 4, 11:08 PM EDT	Special Marine Warning	BUF		52 min
Sep 4, 11:24 PM EDT	Special Marine Warning	BUF		66 min
Sep 4, 11:33 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Sep 4, 11:51 PM EDT	Special Marine Warning	BUF		39 min
Sep 4, 11:57 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	63 min
Sep 5, 12:07 AM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
Sep 5, 12:18 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	30 min
Sep 5, 12:24 AM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	21 min
Sep 5, 10:19 AM EDT	Special Marine Warning	BUF		41 min
Sep 5, 10:23 AM EDT	Special Weather Statement	BUF	Allegany	37 min
Sep 5, 10:38 AM EDT	Special Weather Statement	BUF	Allegany	37 min
Sep 5, 5:46 PM EDT	Special Marine Warning	BUF		59 min

Nearby

Severe Thunderstorm Warnings in New York, 2017 Every severe thunderstorm warning in 2017

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.