Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 29, NWS Buffalo, NY

May 18, 2017Cattaraugus County, Chautauqua County, Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2017, 11:33 PM EDT for Cattaraugus County, Chautauqua County, Erie County, New York. It was in force for 57 min. 2 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: May 18, 2017, 11:33 PM EDT (03:33 UTC)
Expired: May 19, 2017, 12:30 AM EDT
In force: 57 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 70 km from the middle of the area, began a volume at 03:35 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
May 18, 11:43 PM EDT	HAIL 0.75	1 E Dunkirk, NY
May 18, 11:55 PM EDT	TSTM WND DMG	Silver Creek, NY	TREES AND WIRES DOWN

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, 3.6 hours before the alert went out and 71 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: 13 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 2030 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

643 
WUUS51 KBUF 190333
SVRBUF
NYC009-013-029-190430-
/O.NEW.KBUF.SV.W.0029.170519T0333Z-170519T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1133 PM EDT THU MAY 18 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...
  Northeastern Chautauqua County in western New York...

* Until 1230 AM EDT.

* At 1132 PM EDT, a severe thunderstorm was located over Lake Erie
  State Park, or near Dunkirk, 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...
  Dunkirk, Fredonia, Springville, Gowanda, Silver Creek, Ashford,
  North Collins and Ashford Hollow.

This includes Interstate 90 between exits 59 and 58.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. 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 4241 7958 4244 7950 4248 7947 4253 7939
      4254 7934 4257 7928 4261 7859 4226 7852
      4237 7958
TIME...MOT...LOC 0332Z 274DEG 45KT 4245 7946 

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

Wood

2 follow-up statements

822 
WWUS51 KBUF 190400
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1200 AM EDT FRI MAY 19 2017

NYC009-013-029-190430-
/O.CON.KBUF.SV.W.0029.000000T0000Z-170519T0430Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1200 AM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR NORTHWESTERN CATTARAUGUS...SOUTHERN ERIE AND NORTHEASTERN
CHAUTAUQUA COUNTIES...

At 1200 AM EDT, a severe thunderstorm was located near Gowanda, or 17
miles east of Fredonia, 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...
Springville, Gowanda, Ashford, North Collins, East Concord, Ashford
Hollow, Concord and Collins.

This includes Interstate 90 near exit 58.
 
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 this storm.
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 4249 7918 4258 7908 4261 7859 4226 7852
      4235 7936 4243 7928
TIME...MOT...LOC 0400Z 274DEG 45KT 4242 7898 

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

Wood

232 
WWUS51 KBUF 190429
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1229 AM EDT FRI MAY 19 2017

NYC009-013-029-190439-
/O.EXP.KBUF.SV.W.0029.000000T0000Z-170519T0430Z/
Cattaraugus NY-Erie NY-Chautauqua NY-
1229 AM EDT FRI MAY 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CATTARAUGUS...
SOUTHERN ERIE AND NORTHEASTERN CHAUTAUQUA COUNTIES WILL EXPIRE AT
1230 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

LAT...LON 4249 7918 4258 7908 4261 7859 4226 7852
      4235 7936 4243 7928
TIME...MOT...LOC 0429Z 274DEG 45KT 4239 7851 

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 8:50 PM EDT	Special Weather Statement	BUF	Chautauqua	25 min
May 18, 9:01 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	15 min
May 18, 9:08 PM EDT	Special Marine Warning	BUF		37 min
May 18, 11:14 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Monroe, Ontario, Oswego, Wayne	46 min
May 18, 11:27 PM EDT	Special Weather Statement	BUF	Ontario	33 min
May 18, 11:34 PM EDT	Special Marine Warning	BUF		56 min
May 18, 11:49 PM EDT	Special Weather Statement	BUF	Wyoming	26 min
May 19, 12:02 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wyoming	28 min
May 19, 12:32 AM EDT	Special Weather Statement	BUF	Wyoming	43 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.