Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 111, NWS Buffalo, NY

August 22, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 22, 2017, 1:56 PM EDT for 4 counties in New York. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 22, 2017, 1:56 PM EDT (17:56 UTC)
Expired: Aug 22, 2017, 2:45 PM EDT
In force: 49 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Livingston County, NY, Ontario County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 88 km from the middle of the area, began a volume at 17:58 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 22, 12:23 PM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.9 hours before the alert went out and 85 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: 435 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

921 
WUUS51 KBUF 221756
SVRBUF
NYC003-051-069-121-221845-
/O.NEW.KBUF.SV.W.0111.170822T1756Z-170822T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
156 PM EDT TUE AUG 22 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wyoming County in western New York...
  Livingston County in western New York...
  Northern Allegany County in western New York...
  Southwestern Ontario County in western New York...

* Until 245 PM EDT.

* At 155 PM EDT, a severe thunderstorm was located over Rushford, or
  21 miles north of Olean, moving northeast at 60 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...
  Dansville, Letchworth State Park, Mount Morris, Conesus, Belfast,
  Rushford, Naples and Houghton.

This includes Interstate 390 between exits 4 and 7.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 900 PM EDT for western New
York.

LAT...LON 4255 7831 4290 7756 4265 7736 4258 7737
      4258 7766 4253 7766 4253 7772 4240 7773
      4228 7831
TIME...MOT...LOC 1755Z 239DEG 54KT 4238 7830 

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

Apffel

3 follow-up statements

261 
WWUS51 KBUF 221820
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
220 PM EDT TUE AUG 22 2017

NYC003-051-069-121-221845-
/O.CON.KBUF.SV.W.0111.000000T0000Z-170822T1845Z/
Wyoming NY-Livingston NY-Allegany NY-Ontario NY-
220 PM EDT TUE AUG 22 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHEASTERN WYOMING...LIVINGSTON...NORTHERN ALLEGANY AND
SOUTHWESTERN ONTARIO COUNTIES...

At 220 PM EDT, a severe thunderstorm was located 7 miles west of
South Dansville, or 7 miles southwest of Dansville, moving east at 35
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...
Dansville, Letchworth State Park, Mount Morris, Conesus, Belfast,
Rushford, Naples and Houghton.

This includes Interstate 390 between exits 4 and 7.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 900 PM EDT for western New
York.

LAT...LON 4255 7831 4290 7756 4265 7736 4258 7737
      4258 7766 4253 7766 4253 7772 4240 7773
      4228 7831
TIME...MOT...LOC 1820Z 263DEG 29KT 4247 7779 

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

Mitchell

585 
WWUS51 KBUF 221831
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
231 PM EDT TUE AUG 22 2017

NYC121-221840-
/O.CAN.KBUF.SV.W.0111.000000T0000Z-170822T1845Z/
Wyoming NY-
231 PM EDT TUE AUG 22 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WYOMING COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. 

A tornado watch remains in effect until 900 PM EDT for western New 
York.

LAT...LON 4242 7812 4286 7753 4265 7736 4258 7737
      4258 7766 4253 7766 4253 7772 4240 7773
      4233 7807
TIME...MOT...LOC 1830Z 239DEG 54KT 4255 7760 

$$

NYC003-051-069-221845-
/O.CON.KBUF.SV.W.0111.000000T0000Z-170822T1845Z/
Livingston NY-Allegany NY-Ontario NY-
231 PM EDT TUE AUG 22 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHEASTERN LIVINGSTON...NORTHEASTERN ALLEGANY AND SOUTHWESTERN
ONTARIO COUNTIES...

At 230 PM EDT, a severe thunderstorm was located over Wayland, or
near Dansville, moving northeast at 60 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...
Dansville, Conesus, Naples, Honeoye, Hemlock, Groveland, Springwater
and Canadice.

This includes Interstate 390 between exits 4 and 5.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 900 PM EDT for western New
York.

LAT...LON 4242 7812 4286 7753 4265 7736 4258 7737
      4258 7766 4253 7766 4253 7772 4240 7773
      4233 7807
TIME...MOT...LOC 1830Z 239DEG 54KT 4255 7760 

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

Apffel

985 
WWUS51 KBUF 221844
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
244 PM EDT TUE AUG 22 2017

NYC003-051-069-221854-
/O.EXP.KBUF.SV.W.0111.000000T0000Z-170822T1845Z/
Livingston NY-Allegany NY-Ontario NY-
244 PM EDT TUE AUG 22 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON...
NORTHEASTERN ALLEGANY AND SOUTHWESTERN ONTARIO COUNTIES WILL EXPIRE
AT 245 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore the warning will be
allowed to expire.

A tornado watch remains in effect until 900 PM EDT for western New
York.

LAT...LON 4242 7812 4286 7753 4265 7736 4258 7737
      4258 7766 4253 7766 4253 7772 4240 7773
      4233 7807
TIME...MOT...LOC 1844Z 239DEG 54KT 4265 7737 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 10:39 PM EDT	Beach Hazards Statement	BUF	Chautauqua, Erie, Jefferson	23 hr
Aug 22, 4:04 AM EDT	Wind Advisory	BUF	Erie, Genesee, Niagara, Orleans	13 hr
Aug 22, 4:09 AM EDT	Lakeshore Flood Warning	BUF	Cayuga, Jefferson, Oswego, Wayne	40 hr
Aug 22, 7:16 AM EDT	Special Weather Statement	BUF	Lewis	59 min
Aug 22, 9:51 AM EDT	Special Marine Warning	BUF		54 min
Aug 22, 12:05 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	55 min
Aug 22, 12:34 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans, Wayne and 1 more	56 min
Aug 22, 12:34 PM EDT	Tornado Warning	BUF	Cattaraugus, Chautauqua	26 min
Aug 22, 12:42 PM EDT	Special Marine Warning	BUF		48 min
Aug 22, 12:44 PM EDT	Special Marine Warning	BUF		61 min
Aug 22, 12:55 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Genesee, Livingston, Wyoming	65 min
Aug 22, 1:13 PM EDT	Special Marine Warning	BUF		62 min
Aug 22, 1:23 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Monroe, Ontario, Oswego, Wayne	67 min
Aug 22, 1:27 PM EDT	Special Marine Warning	BUF		63 min
Aug 22, 1:42 PM EDT	Special Marine Warning	BUF		63 min
Aug 22, 1:53 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	67 min
Aug 22, 2:05 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Lewis, Oswego	55 min
Aug 22, 2:12 PM EDT	Tornado Warning	BUF	Allegany, Livingston	33 min
Aug 22, 2:47 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	58 min
Aug 22, 2:48 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 1 more	57 min
Aug 22, 3:11 PM EDT	Tornado Warning	BUF	Lewis	34 min
Aug 22, 3:15 PM EDT	Tornado Warning	BUF	Lewis	30 min
Aug 22, 3:20 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Livingston, Wyoming	55 min
Aug 22, 3:45 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wyoming	45 min
Aug 22, 4:28 PM EDT	Special Marine Warning	BUF		92 min
Aug 22, 4:29 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	19 min
Aug 22, 4:40 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	35 min
Aug 22, 4:53 PM EDT	Special Weather Statement	BUF	Jefferson	67 min
Aug 22, 5:10 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	35 min
Aug 22, 5:28 PM EDT	Special Marine Warning	BUF		47 min
Aug 22, 5:29 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	61 min
Aug 22, 6:28 PM EDT	Special Marine Warning	BUF		32 min
Aug 22, 6:28 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	47 min
Aug 22, 7:00 PM EDT	Special Marine Warning	BUF		30 min
Aug 22, 7:13 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans, Wyoming	22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.