Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 89, NWS Buffalo, NY

August 20, 2009Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 20, 2009, 9:52 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 53 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
Aug 20, 2009, 9:52 PM EDT (01:52 UTC)
Expired
Aug 20, 2009, 10:45 PM EDT
In force
53 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 74 km from the middle of the area, began a volume at 01:54 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

TimeReportWhereRemark
Aug 20, 10:20 PM EDTTSTM WND DMGCuba, NYTREE DOWN IN CUBA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 20, 6:54 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 1.9 hours before the alert went out and 71 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 00:00Z on 2009-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 828 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 00:00Z on 2009-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
828 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1273 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
306 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBUF 210152
SVRBUF
NYC003-009-210245-
/O.NEW.KBUF.SV.W.0089.090821T0152Z-090821T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
952 PM EDT THU AUG 20 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLEGANY COUNTY IN WESTERN NEW YORK
  EASTERN CATTARAUGUS COUNTY IN WESTERN NEW YORK

* UNTIL 1045 PM EDT

* AT 951 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 5 MILES SOUTH OF ASHFORD...OR 9
  MILES NORTHEAST OF SALAMANCA...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FRANKLINVILLE BY 1005 PM EDT...
  RUSHFORD BY 1020 PM EDT...
  HOUGHTON BY 1030 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM EDT FRIDAY
MORNING FOR WESTERN NEW YORK.

LAT...LON 4234 7867 4253 7831 4252 7791 4233 7773
      4211 7857
TIME...MOT...LOC 0152Z 237DEG 36KT 4225 7858

$$

ZAFF
2 follow-up statements
000 
WWUS51 KBUF 210229
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1029 PM EDT THU AUG 20 2009

NYC009-210238-
/O.CAN.KBUF.SV.W.0089.000000T0000Z-090821T0245Z/
CATTARAUGUS NY-
1029 PM EDT THU AUG 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CATTARAUGUS COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED EAST OF CATTAURAUGUS COUNTY... 
THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT 
TONIGHT FOR WESTERN NEW YORK.

LAT...LON 4221 7822 4253 7829 4252 7791 4233 7773
TIME...MOT...LOC 0228Z 237DEG 36KT 4244 7817

$$

NYC003-210245-
/O.CON.KBUF.SV.W.0089.000000T0000Z-090821T0245Z/
ALLEGANY NY-
1029 PM EDT THU AUG 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR NORTHERN ALLEGANY COUNTY...

AT 1028 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 HOUGHTON...MOVING 
NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FILLMORE BY 1035 PM EDT...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT 
TONIGHT FOR WESTERN NEW YORK.

&&

LAT...LON 4221 7822 4253 7829 4252 7791 4233 7773
TIME...MOT...LOC 0228Z 237DEG 36KT 4244 7817

$$

HITCHCOCK
000 
WWUS51 KBUF 210245
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1045 PM EDT THU AUG 20 2009

NYC003-210254-
/O.EXP.KBUF.SV.W.0089.000000T0000Z-090821T0245Z/
ALLEGANY NY-
1045 PM EDT THU AUG 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ALLEGANY COUNTY WILL
EXPIRE AT 1045 PM EDT...

AT 1044 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 ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT 
EDT TONIGHT FOR WESTERN NEW YORK.

LAT...LON 4221 7822 4253 7829 4252 7791 4233 7773
TIME...MOT...LOC 0244Z 237DEG 36KT 4253 7798

$$

HITCHCOCK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 8:31 PM EDTSpecial Marine WarningBUF44 min
Aug 20, 8:31 PM EDTSevere Thunderstorm WarningBUFOrleans59 min
Aug 20, 8:52 PM EDTAreal Flood AdvisoryBUFAllegany, Cattaraugus, Chautauqua, Erie, Genesee, Niagara and 2 more3 hr
Aug 20, 8:59 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua61 min
Aug 20, 9:16 PM EDTSpecial Marine WarningBUF89 min
Aug 20, 10:04 PM EDTSevere Thunderstorm WarningBUFGenesee, Monroe, Orleans56 min
Aug 20, 10:06 PM EDTSevere Thunderstorm WarningBUFAllegany54 min
Aug 20, 10:19 PM EDTSpecial Marine WarningBUF86 min
Aug 20, 10:25 PM EDTTornado WarningBUFAllegany35 min
Aug 20, 11:28 PM EDTSpecial Marine WarningBUF92 min

Nearby

Severe Thunderstorm Warnings in New York, 2009Every severe thunderstorm warning in 2009

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.