Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 76, NWS Buffalo, NY

July 20, 20177 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2017, 12:31 PM EDT for 7 counties in New York. It was in force for 59 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: Jul 20, 2017, 12:31 PM EDT (16:31 UTC)
Expired: Jul 20, 2017, 1:30 PM EDT
In force: 59 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Niagara County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 16 km from the middle of the area, began a volume at 16:31 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
Jul 20, 12:33 PM EDT	TSTM WND DMG	1 Ne Hamburg, NY	NEWS VIDEO OF MULTIPLE PICNIC TABLES MANGLED... ONE THROWN ON ROOF AT ERIE COUNTY FAIRGROUNDS
Jul 20, 12:33 PM EDT	TSTM WND DMG	1 Ne Hamburg, NY	PHOTOS OF MULTIPLE CARS WITH WINDOWS BLOWN OUT AND REMNANTS OF TRAILER OVERTURNED IN PARKING LOT OF ERIE COUNTY FAIRGROUNDS.
Jul 20, 12:33 PM EDT	TSTM WND DMG	2 Ene Hamburg, NY	TREE SNAPPED.
Jul 20, 12:33 PM EDT	TSTM WND DMG	2 Nw Hamburg, NY	TREES AND FENCE BLOWN DOWN
Jul 20, 12:34 PM EDT	TSTM WND DMG	1 Ene Hamburg, NY	ERIE COUNTY DPW POSTED PICTURE OF TREE DOWN ON CLARK ST.
Jul 20, 12:35 PM EDT	FUNNEL CLOUD	2 E Hamburg, NY	SPOTTER ERPORTED FUNNEL CLOUD NEAR SOUTH ABBOTT AND THE ORCHARD PARK/HAMBURG TOWN LINE.
Jul 20, 12:39 PM EDT	TSTM WND DMG	3 Wnw West Falls, NY	PHOTOS OF EXTENSIVE TREE DAMAGE AT CHESTNUT RIDGE PARK VIA COUNTY EXEC. TREES SNAPPED/BLOWN OVER.
Jul 20, 12:39 PM EDT	TORNADO	4 E Hamburg, NY	STORM SURVEY CONFIRMED EF2 TORNADO. DAMAGE TO THE HAMBURG FAIRGROUNDS AND CHESTNUT RIDGE PARK. NO DIRECT INJURIES.
Jul 20, 12:40 PM EDT	TSTM WND DMG	2 Nw West Falls, NY	TREES DOWN ON GARTMAN RD BETWEEN 277 AND SCHERFF
Jul 20, 12:42 PM EDT	TSTM WND DMG	1 Wnw West Falls, NY	TREE AND WIRES DOWN ON BEHM RD BETWEEN COLE RD AND RTE. 240.
Jul 20, 12:52 PM EDT	TSTM WND DMG	2 Nnw Holland, NY	RTE 16 CLOSED BETWEEN PARTRIDGE AND BLANCHARD RD. DUE TO DEBRIS IN ROAD.
Jul 20, 12:53 PM EDT	TSTM WND DMG	3 S South Wales, NY	TREES DOWN AND LARGE PARTY TENT DESTROYED.
Jul 20, 12:53 PM EDT	TSTM WND DMG	Holland, NY	PHOTOS OF TREES ON POWERLINES IN HOLLAND BY ERIE COUNTY SHERIFF. TIME ESTIMATED BY RADAR.
Jul 20, 12:56 PM EDT	TSTM WND DMG	2 Ene Holland, NY	TREES DOWN AT VERMONT ST. AND VERMONT HILL RD.
Jul 20, 12:56 PM EDT	TORNADO	1 Nnw Holland, NY	STORM SURVEY CONFIRMED EF1 TORNADO. SEVERAL STRUCTURES DAMAGED AND A SIGNIFICANT AMOUNT OF TREE DAMAGE. TRACKS OF THE NORFOLK SOUTHERN RAILWAY WERE BLOCKED BY LARGE TREES IN SEVERAL LOCATIONS. NO DIRECT INJURIES.
Jul 20, 1:01 PM EDT	TSTM WND DMG	3 Se Holland, NY	TREES DOWN ON S. PROTECTION RD NEAR VERMONT HILL.
Jul 20, 1:17 PM EDT	TSTM WND DMG	4 S Bliss, NY	TREES AND WIRES DOWN
Jul 20, 1:27 PM EDT	TSTM WND DMG	1 Nw Fillmore, NY	TREES DOWN ON MILLS ROAD.
Jul 20, 1:35 PM EDT	TSTM WND DMG	1 Ese Houghton, NY	SNAPPED ELECTRIC POLES...TREES AND WIRES DOWN COUNSIL HOUSE RD

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 12:00Z, 4.5 hours before the alert went out and 14 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2004 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

256 
WUUS51 KBUF 201631
SVRBUF
NYC003-009-029-037-051-063-121-201730-
/O.NEW.KBUF.SV.W.0076.170720T1631Z-170720T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1231 PM EDT THU JUL 20 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Wyoming County in western New York...
  Northeastern Cattaraugus County in western New York...
  Erie County in western New York...
  Southwestern Livingston County in western New York...
  South central Niagara County in western New York...
  Northwestern Allegany County in western New York...
  Southwestern Genesee County in western New York...

* Until 130 PM EDT.

* At 1230 PM EDT, a severe thunderstorm was located over Blasdell, or
  over Lackawanna, moving east at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

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

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

This includes the following highways...
 Interstate 390 between exits 6 and 7.
 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 4272 7898 4277 7896 4280 7892 4284 7893
      4289 7891 4292 7890 4294 7891 4311 7886
      4279 7772 4237 7801
TIME...MOT...LOC 1630Z 286DEG 27KT 4280 7882 

HAIL...0.75IN
WIND...60MPH
 
$$

Mitchell

3 follow-up statements

041 
WWUS51 KBUF 201649
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1249 PM EDT THU JUL 20 2017

NYC063-201659-
/O.CAN.KBUF.SV.W.0076.000000T0000Z-170720T1730Z/
Niagara NY-
1249 PM EDT THU JUL 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NIAGARA COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4266 7879 4290 7860 4299 7843 4279 7772
      4237 7801
TIME...MOT...LOC 1649Z 279DEG 47KT 4276 7848 

$$

NYC003-009-029-037-051-121-201730-
/O.CON.KBUF.SV.W.0076.000000T0000Z-170720T1730Z/
Wyoming NY-Cattaraugus NY-Erie NY-Livingston NY-Allegany NY-
Genesee NY-
1249 PM EDT THU JUL 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR WYOMING...NORTHEASTERN CATTARAUGUS...EAST CENTRAL ERIE...
SOUTHWESTERN LIVINGSTON...NORTHWESTERN ALLEGANY AND SOUTHWESTERN
GENESEE COUNTIES...

At 1249 PM EDT, a severe thunderstorm was located over Wales Center,
or 7 miles east of East Aurora, moving east at 55 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Geneseo, East Aurora, Darien Lakes State Park, Letchworth State Park,
Elma, Marilla, Perry and Warsaw.

This includes Interstate 390 between exits 6 and 7.
 
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 4266 7879 4290 7860 4299 7843 4279 7772
      4237 7801
TIME...MOT...LOC 1649Z 279DEG 47KT 4276 7848 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel

402 
WWUS51 KBUF 201709
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
109 PM EDT THU JUL 20 2017

NYC037-201719-
/O.CAN.KBUF.SV.W.0076.000000T0000Z-170720T1730Z/
Genesee NY-
109 PM EDT THU JUL 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GENESEE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4256 7853 4272 7838 4286 7825 4279 7772
      4237 7801
TIME...MOT...LOC 1709Z 289DEG 43KT 4264 7831 

$$

NYC003-009-029-051-121-201730-
/O.CON.KBUF.SV.W.0076.000000T0000Z-170720T1730Z/
Wyoming NY-Cattaraugus NY-Erie NY-Livingston NY-Allegany NY-
109 PM EDT THU JUL 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR WYOMING...NORTHEASTERN CATTARAUGUS...EASTERN ERIE...SOUTHWESTERN
LIVINGSTON AND NORTHWESTERN ALLEGANY COUNTIES...

At 109 PM EDT, a severe thunderstorm was located 8 miles south of
Varysburg, or 16 miles west of Letchworth State Park, moving east at
50 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Geneseo, Letchworth State Park, Perry, Warsaw, Mount Morris, Arcade,
Houghton and Chaffee.

This includes Interstate 390 between exits 6 and 7.
 
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 4256 7853 4272 7838 4286 7825 4279 7772
      4237 7801
TIME...MOT...LOC 1709Z 289DEG 43KT 4264 7831 

HAIL...1.00IN
WIND...60MPH
 
$$

Apffel

302 
WWUS51 KBUF 201724
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
124 PM EDT THU JUL 20 2017

NYC003-009-029-051-121-201733-
/O.EXP.KBUF.SV.W.0076.000000T0000Z-170720T1730Z/
Wyoming NY-Cattaraugus NY-Erie NY-Livingston NY-Allegany NY-
124 PM EDT THU JUL 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR WYOMING...NORTHEASTERN
CATTARAUGUS...EASTERN ERIE...SOUTHWESTERN LIVINGSTON AND NORTHWESTERN
ALLEGANY COUNTIES WILL EXPIRE AT 130 PM EDT...
        
The storm which prompted the warning has moved out of the area and 
or replaced by another warning. Therefore this warning will be 
allowed to expire.

A severe thunderstorm watch remains in effect until 800 PM EDT for
western New York.

LAT...LON 4256 7853 4272 7838 4286 7825 4279 7772
      4237 7801
TIME...MOT...LOC 1723Z 286DEG 27KT 4261 7818 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 11:44 AM EDT	Special Marine Warning	BUF		31 min
Jul 20, 11:47 AM EDT	Special Weather Statement	BUF	Genesee, Monroe, Niagara, Orleans, Wyoming	58 min
Jul 20, 12:11 PM EDT	Special Marine Warning	BUF		34 min
Jul 20, 12:21 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Livingston, Monroe, Niagara, Ontario and 2 more	54 min
Jul 20, 12:36 PM EDT	Tornado Warning	BUF	Cattaraugus, Erie, Wyoming	24 min
Jul 20, 12:55 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus, Erie, Wyoming	35 min
Jul 20, 1:23 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Wyoming	52 min
Jul 20, 1:35 PM EDT	Tornado Warning	BUF	Allegany	40 min
Jul 20, 1:44 PM EDT	Special Weather Statement	BUF	Erie	31 min
Jul 20, 2:07 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Wyoming	38 min
Jul 20, 2:46 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	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.