Alert archive / New York / Tornado Warnings in 2017

Tornado Warning 2, NWS Buffalo, NY

July 20, 20174 counties in New York

NWS Buffalo, NY issued this tornado warning at Jul 20, 2017, 12:55 PM EDT for 4 counties in New York. It was in force for 35 min. 6 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, 12:55 PM EDT (16:55 UTC)
Expired: Jul 20, 2017, 1:30 PM EDT
In force: 35 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Allegany County, NY, Cattaraugus County, NY, Erie County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 46 km from the middle of the area, began a volume at 16:58 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, 12:56 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, 4.9 hours before the alert went out and 42 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.

203 
WFUS51 KBUF 201655
TORBUF
NYC003-009-029-121-201730-
/O.NEW.KBUF.TO.W.0002.170720T1655Z-170720T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Buffalo NY
1255 PM EDT THU JUL 20 2017

The National Weather Service in Buffalo has issued a

* Tornado Warning for...
  Southern Wyoming County in western New York...
  Northeastern Cattaraugus County in western New York...
  Southeastern Erie County in western New York...
  Northwestern Allegany County in western New York...

* Until 130 PM EDT.

* At 1254 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Colden, or 7 miles south of East Aurora,
  moving east at 40 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations impacted include...
  East Aurora, Arcade, Houghton, Chaffee, Yorkshire, Holland,
  Sardinia and Eagle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4260 7870 4277 7861 4265 7802 4240 7815
TIME...MOT...LOC 1654Z 290DEG 34KT 4266 7856 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Mitchell

2 follow-up statements

937 
WWUS51 KBUF 201706
SVSBUF

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

NYC003-009-029-121-201730-
/O.CON.KBUF.TO.W.0002.000000T0000Z-170720T1730Z/
Wyoming NY-Cattaraugus NY-Erie NY-Allegany NY-
106 PM EDT THU JUL 20 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 130 PM EDT FOR SOUTHERN
WYOMING...NORTHEASTERN CATTARAUGUS...SOUTHEASTERN ERIE AND
NORTHWESTERN ALLEGANY COUNTIES...
    
At 106 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Chaffee, or 14 miles southeast of East Aurora,
moving east at 40 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Arcade, Houghton, Chaffee, Yorkshire, Eagle, Pike, Castile and Silver
Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4257 7857 4273 7843 4265 7802 4240 7815
TIME...MOT...LOC 1706Z 290DEG 34KT 4262 7841 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Mitchell

512 
WWUS51 KBUF 201731
SVSBUF

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

NYC003-009-029-121-201739-
/O.EXP.KBUF.TO.W.0002.000000T0000Z-170720T1730Z/
Wyoming NY-Cattaraugus NY-Erie NY-Allegany NY-
131 PM EDT THU JUL 20 2017

...THE TORNADO WARNING FOR SOUTHERN WYOMING...NORTHEASTERN
CATTARAUGUS...SOUTHEASTERN ERIE AND NORTHWESTERN ALLEGANY COUNTIES
WILL EXPIRE AT 130 PM EDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for Allegany County.

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

LAT...LON 4257 7857 4273 7843 4265 7802 4240 7815
TIME...MOT...LOC 1729Z 290DEG 34KT 4254 7813 

$$

Mitchell

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, 12:31 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Genesee, Livingston, Niagara and 1 more	59 min
Jul 20, 12:36 PM EDT	Tornado Warning	BUF	Cattaraugus, Erie, Wyoming	24 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

Tornado Warnings in New York, 2017 Every tornado warning in 2017 Tornadoes 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.