Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 64, NWS Buffalo, NY

September 21, 2018Cattaraugus County, Chautauqua County, Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 21, 2018, 5:15 PM EDT for Cattaraugus County, Chautauqua County, Erie County, New York. It was in force for 45 min. 3 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 21, 2018, 5:15 PM EDT (21:15 UTC)
Expired: Sep 21, 2018, 6:00 PM EDT
In force: 45 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
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 21:19 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 21, 5:28 PM EDT	TSTM WND GST 61	Dunkirk, NY	DELAYED REPORT FROM FRIDAY 09/21
Sep 21, 5:40 PM EDT	TSTM WND DMG	Forestville, NY	TREES DOWN
Sep 21, 5:50 PM EDT	TSTM WND DMG	Hamlet, NY	TREES AND WIRES DOWN THROUGHOUT PORTIONS OF CHAUTAUQUA COUNTY.

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 21, 4:50 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.3 hours before the alert went out and 66 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: 445 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

384 
WUUS51 KBUF 212115
SVRBUF
NYC009-013-029-212200-
/O.NEW.KBUF.SV.W.0064.180921T2115Z-180921T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
515 PM EDT FRI SEP 21 2018

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...
  Northern Chautauqua County in western New York...

* Until 600 PM EDT..

* At 514 PM EDT, a severe thunderstorm was located near Westfield, or
  18 miles west of Fredonia, moving east at 60 to 70 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Lackawanna, Dunkirk, Fredonia, Hamburg, Evans, Boston, Eden,
  Springville, Colden and Westfield.

This includes Interstate 90 between exits 61 and 57.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4244 7950 4253 7939 4260 7919 4264 7916
      4267 7912 4272 7909 4276 7898 4282 7887
      4260 7861 4227 7854 4224 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 2114Z 252DEG 63KT 4237 7969 

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

RSH

2 follow-up statements

315 
WWUS51 KBUF 212136
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
536 PM EDT FRI SEP 21 2018

NYC009-013-029-212200-
/O.CON.KBUF.SV.W.0064.000000T0000Z-180921T2200Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
536 PM EDT FRI SEP 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN CATTARAUGUS...SOUTHERN ERIE AND NORTHERN CHAUTAUQUA
COUNTIES...

At 535 PM EDT, a severe thunderstorm was located near Silver Creek,
or 7 miles east of Dunkirk, moving east at 70 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Lackawanna, Dunkirk, Fredonia, Hamburg, Evans, Boston, Eden,
Springville, Colden and Westfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4228 7973 4237 7952 4251 7935 4260 7919
      4272 7909 4282 7887 4260 7861 4227 7854
      4224 7976
TIME...MOT...LOC 2135Z 252DEG 63KT 4249 7920 

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

Reynolds

376 
WWUS51 KBUF 212159
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
559 PM EDT FRI SEP 21 2018

NYC009-013-029-212207-
/O.EXP.KBUF.SV.W.0064.000000T0000Z-180921T2200Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
559 PM EDT FRI SEP 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CATTARAUGUS...
SOUTHERN ERIE AND NORTHERN CHAUTAUQUA COUNTIES WILL EXPIRE AT 600 PM
EDT...
        
The storm which prompted the warning has continued to move east
and now has been replace by another severe thunderstorm warning. 
Therefore, this warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western New York.

LAT...LON 4228 7973 4237 7952 4251 7935 4260 7919
      4272 7909 4282 7887 4260 7861 4227 7854
      4224 7976
TIME...MOT...LOC 2157Z 252DEG 63KT 4260 7876 

$$

Reynolds

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 10:00 PM EDT	Beach Hazards Statement	BUF	Chautauqua, Erie, Jefferson, Niagara, Orleans	22 hr
Sep 21, 4:45 PM EDT	Special Marine Warning	BUF		60 min
Sep 21, 5:22 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	38 min
Sep 21, 5:27 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	48 min
Sep 21, 5:54 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Wyoming	66 min
Sep 21, 6:31 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wayne, Wyoming	59 min
Sep 21, 6:38 PM EDT	Special Marine Warning	BUF		70 min
Sep 21, 6:48 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	42 min
Sep 21, 6:51 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	54 min
Sep 21, 7:07 PM EDT	Tornado Warning	BUF	Ontario	23 min
Sep 21, 7:29 PM EDT	Special Marine Warning	BUF		46 min

Nearby

Severe Thunderstorm Warnings in New York, 2018 Every severe thunderstorm warning in 2018

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.