Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 53, NWS Buffalo, NY

July 25, 20094 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 25, 2009, 6:17 PM EDT for 4 counties in New York. It was in force for 43 min. 2 reports 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
Jul 25, 2009, 6:17 PM EDT (22:17 UTC)
Expired
Jul 25, 2009, 7:00 PM EDT
In force
43 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Genesee County, NY, Livingston County, NY, Monroe County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 65 km from the middle of the area, began a volume at 22:20 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
Jul 25, 6:29 PM EDTTSTM WND DMGBrockport, NYTREES AND WIRES DOWN
Jul 25, 6:48 PM EDTTSTM WND DMGChurchville, NYTREES AND WIRES DOWN

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
Jul 25, 3:50 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.3 hours before the alert went out and 63 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 12:00Z on 2009-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 12:00Z on 2009-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.19395878Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1504 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
138 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.

000 
WUUS51 KBUF 252217
SVRBUF
NYC037-051-055-073-252300-
/O.NEW.KBUF.SV.W.0053.090725T2217Z-090725T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
617 PM EDT SAT JUL 25 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GENESEE COUNTY IN WESTERN NEW YORK
  NORTH CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK
  WESTERN MONROE COUNTY IN WESTERN NEW YORK
  SOUTHEASTERN ORLEANS COUNTY IN WESTERN NEW YORK

* UNTIL 700 PM EDT

* AT 616 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTH OF BYRON TO 7
  MILES SOUTH OF BATAVIA...MOVING NORTHEAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PAVILION AND BYRON BY 625 PM EDT...
  BROCKPORT AND LE ROY BY 635 PM EDT...
  YORK BY 640 PM EDT...
  CHURCHVILLE BY 645 PM EDT...
  CALEDONIA BY 650 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
SATURDAY EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4330 7781 4287 7780 4289 7823 4315 7816
TIME...MOT...LOC 2217Z 242DEG 26KT 4315 7807 4291 7816

$$

RSH
2 follow-up statements
000 
WWUS51 KBUF 252252
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
652 PM EDT SAT JUL 25 2009

NYC037-051-055-073-252300-
/O.CON.KBUF.SV.W.0053.000000T0000Z-090725T2300Z/
LIVINGSTON NY-GENESEE NY-MONROE NY-ORLEANS NY-
652 PM EDT SAT JUL 25 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHEASTERN ORLEANS...WESTERN MONROE...EASTERN GENESEE AND NORTH
CENTRAL LIVINGSTON COUNTIES...

AT 649 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR SPENCERPORT...MOVING NORTHEAST AT 30 MPH. THIS STORM 
WAS SHOWING SIGNS OF ROTATION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
SATURDAY EVENING FOR WESTERN NEW YORK.

&&

LAT...LON 4330 7781 4287 7780 4289 7823 4315 7816
TIME...MOT...LOC 2251Z 242DEG 26KT 4315 7781

$$

RSH
000 
WWUS51 KBUF 252301
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
701 PM EDT SAT JUL 25 2009

NYC037-051-055-073-252311-
/O.EXP.KBUF.SV.W.0053.000000T0000Z-090725T2300Z/
LIVINGSTON NY-GENESEE NY-MONROE NY-ORLEANS NY-
701 PM EDT SAT JUL 25 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ORLEANS...WESTERN
MONROE...EASTERN GENESEE AND NORTH CENTRAL LIVINGSTON COUNTIES HAS
EXPIRED...

AT 701 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO 
LONGER SEVERE...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS WERE 
STILL POSSIBLE FROM OTHER THUNDERSTORMS MOVING IN FROM WYOMING 
COUNTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
SATURDAY EVENING FOR WESTERN NEW YORK.

LAT...LON 4330 7781 4287 7780 4289 7823 4315 7816
TIME...MOT...LOC 2252Z 242DEG 26KT 4315 7780

$$

RSH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 10:05 PM EDTSpecial Marine WarningBUF30 min
Jul 25, 3:21 PM EDTSpecial Marine WarningBUF54 min
Jul 25, 3:32 PM EDTSevere Thunderstorm WarningBUFErie, Niagara58 min
Jul 25, 4:11 PM EDTTornado WarningBUFErie18 min
Jul 25, 4:26 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Niagara, Orleans64 min
Jul 25, 4:40 PM EDTSpecial Marine WarningBUF65 min
Jul 25, 5:03 PM EDTTornado WarningBUFGenesee, Monroe, Orleans42 min
Jul 25, 5:14 PM EDTSpecial Marine WarningBUF91 min
Jul 25, 5:25 PM EDTSevere Thunderstorm WarningBUFGenesee, Monroe, Orleans65 min
Jul 25, 5:46 PM EDTTornado WarningBUFMonroe44 min
Jul 25, 6:56 PM EDTSevere Thunderstorm WarningBUFMonroe64 min
Jul 25, 6:58 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.