Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 18, NWS Buffalo, NY

May 23, 2011Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 23, 2011, 11:13 PM EDT for Allegany County, New York. It was in force for 17 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: May 23, 2011, 11:13 PM EDT (03:13 UTC)
Expired: May 23, 2011, 11:30 PM EDT
In force: 17 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 113 km from the middle of the area, began a volume at 03:14 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 00:00Z, 3.2 hours before the alert went out and 109 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: 191 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

040 
WUUS51 KBUF 240313
SVRBUF
NYC003-240330-
/O.NEW.KBUF.SV.W.0018.110524T0313Z-110524T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1113 PM EDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 1130 PM EDT

* AT 1112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE LOCATED ALONG A
  LINE EXTENDING FROM ALFRED TO WELLSVILLE TO 10 MILES SOUTHWEST 
  OF WELLSVILLE...AND MOVING EAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  WHITESVILLE...

LAT...LON 4200 7821 4206 7823 4207 7822 4216 7805
      4224 7795 4226 7773 4200 7774 4199 7776
TIME...MOT...LOC 0313Z 270DEG 38KT 4224 7777 4215 7786
          4204 7806

$$

HIBBERT

1 follow-up statement

838 
WWUS51 KBUF 240330
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1130 PM EDT MON MAY 23 2011

NYC003-240339-
/O.EXP.KBUF.SV.W.0018.000000T0000Z-110524T0330Z/
ALLEGANY NY-
1130 PM EDT MON MAY 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALLEGANY COUNTY
WILL EXPIRE AT 1130 PM EDT...

AT 1130 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE
THUNDERSTORM THAT PROMPTED THE WARNING HAD EXITED THE WARNED AREA...
THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4200 7821 4206 7823 4207 7822 4216 7805
      4224 7795 4226 7773 4200 7774 4199 7776
TIME...MOT...LOC 0329Z 270DEG 38KT 4224 7754 4215 7763
          4204 7783

$$

HIBBERT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:23 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	37 min
May 23, 8:45 PM EDT	Special Marine Warning	BUF		30 min
May 23, 8:54 PM EDT	Tornado Warning	BUF	Chautauqua	36 min
May 23, 9:14 PM EDT	Severe Thunderstorm Warning	BUF	Erie	17 min
May 23, 9:24 PM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
May 23, 9:59 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
May 23, 10:05 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	25 min
May 23, 10:30 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	45 min
May 23, 10:56 PM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua, Erie, Wyoming	3 hr
May 23, 11:09 PM EDT	Flash Flood Warning	BUF	Allegany, Cattaraugus, Wyoming	3 hr
May 24, 9:27 AM EDT	Small Craft Advisory	BUF		4 hr

Nearby

Severe Thunderstorm Warnings in New York, 2011 Every severe thunderstorm warning in 2011

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.