Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 2, NWS Buffalo, NY

April 20, 20155 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 20, 2015, 4:10 PM EDT for 5 counties in New York. It was in force for 50 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: Apr 20, 2015, 4:10 PM EDT (20:10 UTC)
Expired: Apr 20, 2015, 5:00 PM EDT
In force: 50 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Erie County, NY, Genesee County, NY, Monroe County, NY, Orleans County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 46 km from the middle of the area, began a volume at 20:11 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
Apr 20, 4:22 PM EDT	TSTM WND DMG	1 E East Pembroke, NY	NUMEROUS TREES DOWN NEAR INDIAN FALLS RD AND PRATT RD.

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, 8.2 hours before the alert went out and 45 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.

741 
WUUS51 KBUF 202010
SVRBUF
NYC029-037-055-073-121-202100-
/O.NEW.KBUF.SV.W.0002.150420T2010Z-150420T2100Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ERIE COUNTY IN WESTERN NEW YORK
  WESTERN GENESEE COUNTY IN WESTERN NEW YORK
  NORTHWESTERN MONROE COUNTY IN WESTERN NEW YORK
  ORLEANS COUNTY IN WESTERN NEW YORK
  NORTHWESTERN WYOMING COUNTY IN WESTERN NEW YORK

* UNTIL 500 PM EDT

* AT 408 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 ALDEN...OR 9 MILES EAST OF  
  LANCASTER...AND MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  AKRON...
  OAKFIELD...
  ALBION...
  KENDALL...
  HAMLIN BEACH...

LAT...LON 4291 7865 4309 7848 4309 7847 4310 7847
      4338 7820 4339 7808 4337 7800 4338 7796
      4337 7795 4335 7782 4280 7845
TIME...MOT...LOC 2010Z 217DEG 44KT 4293 7847

$$

JAM

1 follow-up statement

397 
WWUS51 KBUF 202041
SVSBUF

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

NYC029-037-055-073-121-202100-
/O.CON.KBUF.SV.W.0002.000000T0000Z-150420T2100Z/
GENESEE NY-WYOMING NY-ORLEANS NY-MONROE NY-ERIE NY-
441 PM EDT MON APR 20 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHEASTERN ERIE...NORTHWESTERN MONROE...ORLEANS...NORTHWESTERN
WYOMING AND WESTERN GENESEE 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 BARRE CENTER...OR 8
MILES SOUTH OF ALBION...MOVING NORTHEAST AT 50 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  FANCHER...
  MORTON...
  HAMLIN BEACH...

LAT...LON 4291 7865 4309 7848 4309 7847 4310 7847
      4338 7820 4339 7808 4337 7800 4338 7796
      4337 7795 4335 7782 4280 7845
TIME...MOT...LOC 2041Z 217DEG 44KT 4316 7818

$$

JAM

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, 4:13 PM EDT	Special Weather Statement	BUF	Cattaraugus	47 min
Apr 20, 4:19 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Wyoming	32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.