Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 3, NWS Buffalo, NY

April 20, 2015Allegany County, Cattaraugus County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 20, 2015, 4:19 PM EDT for Allegany County, Cattaraugus County, Wyoming County, New York. It was in force for 32 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: Apr 20, 2015, 4:19 PM EDT (20:19 UTC)
Expired: Apr 20, 2015, 4:51 PM EDT
In force: 32 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Allegany County, NY, Cattaraugus County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 86 km from the middle of the area, began a volume at 20:22 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.3 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 982 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 429 m²/s²
0-3 km storm-relative helicity: 437 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

421 
WUUS51 KBUF 202019
SVRBUF
NYC003-009-121-202100-
/O.NEW.KBUF.SV.W.0003.150420T2019Z-150420T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
419 PM EDT MON APR 20 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLEGANY COUNTY IN WESTERN NEW YORK
  SOUTHEASTERN CATTARAUGUS COUNTY IN WESTERN NEW YORK
  SOUTH CENTRAL WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 500 PM EDT

* AT 417 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR ST. BONAVENTURE...OR NEAR
  OLEAN...AND MOVING NORTHEAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  HINSDALE...
  CUBA...
  RUSHFORD...
  BELFAST...
  HOUGHTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4211 7859 4259 7822 4239 7778 4199 7839
TIME...MOT...LOC 2020Z 219DEG 39KT 4211 7843

$$

APFFEL

2 follow-up statements

168 
WWUS51 KBUF 202039
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
439 PM EDT MON APR 20 2015

NYC003-009-121-202100-
/O.CON.KBUF.SV.W.0003.000000T0000Z-150420T2100Z/
ALLEGANY NY-CATTARAUGUS NY-WYOMING NY-
439 PM EDT MON APR 20 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTH CENTRAL WYOMING...EAST CENTRAL CATTARAUGUS AND NORTHERN
ALLEGANY COUNTIES...

AT 438 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BLACK CREEK...OR 15
MILES NORTHEAST OF OLEAN...MOVING NORTHEAST AT 45 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  CANEADEA...
  HOUGHTON...
  SHORT TRACT...

LAT...LON 4212 7825 4231 7843 4254 7826 4259 7822
      4239 7778
TIME...MOT...LOC 2039Z 219DEG 39KT 4227 7825

$$

APFFEL

231 
WWUS51 KBUF 202051
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
451 PM EDT MON APR 20 2015

NYC003-009-121-202101-
/O.CAN.KBUF.SV.W.0003.000000T0000Z-150420T2100Z/
ALLEGANY NY-CATTARAUGUS NY-WYOMING NY-
451 PM EDT MON APR 20 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WYOMING...EAST
CENTRAL CATTARAUGUS AND NORTHERN ALLEGANY COUNTIES IS CANCELLED...

AT 451 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER
SEVERE...THUS THE WARNING HAS BEEN CANCELLED.

LAT...LON 4212 7825 4231 7843 4254 7826 4259 7822
      4239 7778
TIME...MOT...LOC 2051Z 219DEG 39KT 4237 7814

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 1:25 PM EDT	Wind Advisory	BUF	Jefferson, Lewis	6 hr
Apr 20, 3:28 PM EDT	Severe Thunderstorm Warning	BUF	Erie	47 min
Apr 20, 4:10 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Monroe, Orleans, Wyoming	50 min
Apr 20, 4:13 PM EDT	Special Weather Statement	BUF	Cattaraugus	47 min
Apr 20, 4:41 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans, Wyoming	49 min
Apr 20, 4:58 PM EDT	Special Marine Warning	BUF		62 min
Apr 20, 5:30 PM EDT	Special Weather Statement	BUF	Monroe	45 min
Apr 20, 6:55 PM EDT	Special Weather Statement	BUF	Allegany	50 min
Apr 20, 6:58 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	47 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.