Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 12, NWS Buffalo, NY

May 18, 2015Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2015, 8:11 PM EDT for Allegany County, New York. It was in force for 22 min. 1 report 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, 8:11 PM EDT (00:11 UTC)
Expired: May 18, 2015, 8:33 PM EDT
In force: 22 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 116 km from the middle of the area, began a volume at 00:13 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, 8:20 PM EDT	TSTM WND DMG	2 Se Hallsport, NY	TREE PARTLY ACROSS ROUTE 248.

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, 0.2 hours before the alert went out and 113 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: 113 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

022 
WUUS51 KBUF 190011
SVRBUF
NYC003-190045-
/O.NEW.KBUF.SV.W.0012.150519T0011Z-150519T0045Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN ALLEGANY COUNTY IN WESTERN NEW YORK...

* UNTIL 845 PM EDT

* AT 810 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED NEAR WELLSVILLE...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WELLSVILLE...WHITESVILLE...SCIO...ANDOVER...STANNARDS AND
  PAYNESVILLE.

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4217 7798 4224 7774 4200 7775 4200 7796
TIME...MOT...LOC 0010Z 251DEG 27KT 4207 7788 

$$

RSH

1 follow-up statement

596 
WWUS51 KBUF 190033
SVSBUF

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

NYC003-190043-
/O.CAN.KBUF.SV.W.0012.000000T0000Z-150519T0045Z/
ALLEGANY NY-
833 PM EDT MON MAY 18 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALLEGANY COUNTY
IS CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED EAST TO STEUBEN 
COUNTY. THEREFORE THE WARNING FOR ALLEGANY COUNTY HAS BEEN CANCELLED.

LAT...LON 4217 7798 4224 7774 4200 7775 4200 7796
TIME...MOT...LOC 0031Z 251DEG 27KT 4213 7766 

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 8:27 PM EDT	Special Weather Statement	BUF	Livingston	33 min
May 18, 8:40 PM EDT	Flash Flood Warning	BUF	Allegany, Livingston, Ontario	3 hr
May 18, 9:03 PM EDT	Flash Flood Warning	BUF	Ontario	3 hr

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.