Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 10, NWS Buffalo, NY

May 18, 2015Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2015, 6:54 PM EDT for Cattaraugus County, New York. It was in force for 66 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, 2015, 6:54 PM EDT (22:54 UTC)
Expired: May 18, 2015, 8:00 PM EDT
In force: 66 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 80 km from the middle of the area, began a volume at 22:57 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, 7:05 PM EDT	TSTM WND DMG	Little Valley, NY	TREES AND POWER LINES DOWN
May 18, 7:10 PM EDT	TSTM WND DMG	Ellicottville, NY	TREES AND POWER LINES 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 12:00Z, 10.9 hours before the alert went out and 78 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: 297 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 774 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

843 
WUUS51 KBUF 182254
SVRBUF
NYC009-190000-
/O.NEW.KBUF.SV.W.0010.150518T2254Z-150519T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
654 PM EDT MON MAY 18 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CATTARAUGUS COUNTY IN WESTERN NEW YORK...

* UNTIL 800 PM EDT

* AT 653 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED 10 MILES WEST OF SALAMANCA...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SALAMANCA...ALLEGANY STATE PARK...ASHFORD...FRANKLINVILLE...WESTON
  MILLS...HINSDALE...GREAT VALLEY AND NEW ALBION.

THIS INCLUDES INTERSTATE 86 BETWEEN EXITS 15 AND 16...AND BETWEEN
EXITS 20 AND 21...AND NEAR EXIT 27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A  
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND 
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4212 7905 4229 7905 4251 7833 4210 7833
TIME...MOT...LOC 2253Z 254DEG 29KT 4221 7893 

$$

RSH RSH

2 follow-up statements

641 
WWUS51 KBUF 182326
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
726 PM EDT MON MAY 18 2015

NYC009-190000-
/O.CON.KBUF.SV.W.0010.000000T0000Z-150519T0000Z/
CATTARAUGUS NY-
726 PM EDT MON MAY 18 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHEASTERN CATTARAUGUS COUNTY...

AT 723 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM 
WAS LOCATED OVER ASHFORD...OR 9 MILES NORTHEAST OF 
SALAMANCA...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
SALAMANCA...ALLEGANY STATE PARK...ASHFORD...FRANKLINVILLE...
HINSDALE...GREAT VALLEY...ISCHUA AND LYNDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING VERY HEAVY RAIN AND WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4213 7874 4235 7875 4247 7833 4213 7833
TIME...MOT...LOC 2323Z 254DEG 29KT 4228 7861 

$$

REYNOLDS

658 
WWUS51 KBUF 182359
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
759 PM EDT MON MAY 18 2015

NYC009-190008-
/O.EXP.KBUF.SV.W.0010.000000T0000Z-150519T0000Z/
CATTARAUGUS NY-
759 PM EDT MON MAY 18 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CATTARAUGUS
COUNTY WILL EXPIRE AT 800 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED INTO NORTHERN 
ALLEGANY COUNTY. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4213 7874 4235 7875 4247 7833 4213 7833
TIME...MOT...LOC 2356Z 254DEG 29KT 4228 7861 

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 4:39 AM EDT	Small Craft Advisory	BUF		63 hr
May 18, 1:38 PM EDT	Special Weather Statement	BUF	Cayuga	37 min
May 18, 2:22 PM EDT	Special Weather Statement	BUF	Oswego	38 min
May 18, 4:37 PM EDT	Special Weather Statement	BUF	Oswego	53 min
May 18, 4:54 PM EDT	Special Weather Statement	BUF	Wayne	36 min
May 18, 5:33 PM EDT	Special Weather Statement	BUF	Chautauqua	57 min
May 18, 6:27 PM EDT	Special Weather Statement	BUF	Cattaraugus	48 min
May 18, 7:36 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Livingston	54 min

Nearby

Severe Thunderstorm Warnings in New York, 2015 Every severe thunderstorm warning in 2015

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.