Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 55, NWS Buffalo, NY

July 25, 2009Monroe County, Ontario County, Wayne County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 25, 2009, 8:00 PM EDT for Monroe County, Ontario County, Wayne County, New York. It was in force for 41 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: Jul 25, 2009, 8:00 PM EDT (00:00 UTC)
Expired: Jul 25, 2009, 8:41 PM EDT
In force: 41 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Monroe County, NY, Ontario County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 96 km from the middle of the area, began a volume at 00:01 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
Jul 25, 8:10 PM EDT	TSTM WND DMG	Rochester, NY	COUPLE OF TREES DOWN IN CITY

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.

Issued	Product	Office	Lasted
Jul 25, 3:50 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 0.0 hours before the alert went out and 93 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: 175 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBUF 260000
SVRBUF
NYC055-069-117-260100-
/O.NEW.KBUF.SV.W.0055.090726T0000Z-090726T0100Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MONROE COUNTY IN WESTERN NEW YORK
  NORTHWESTERN ONTARIO COUNTY IN WESTERN NEW YORK
  EXTREME WESTERN WAYNE COUNTY IN WESTERN NEW YORK

* UNTIL 900 PM EDT

* AT 759 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ROCHESTER...AND MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  IRONDEQUOIT BY 805 PM EDT...
  WEBSTER BY 815 PM EDT...

ANOTHER CELL OVER NORTHERN LIVINGSTON COUNTY WILL AFFECT SOUTHERN 
MONROE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
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 4297 7772 4299 7773 4299 7787 4318 7774
      4325 7757 4326 7747 4328 7740 4328 7734
      4304 7733 4295 7749
TIME...MOT...LOC 0000Z 233DEG 25KT 4316 7757

$$

RSH

2 follow-up statements

000 
WWUS51 KBUF 260023
SVSBUF

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

NYC055-069-117-260100-
/O.CON.KBUF.SV.W.0055.000000T0000Z-090726T0100Z/
ONTARIO NY-WAYNE NY-MONROE NY-
823 PM EDT SAT JUL 25 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHEASTERN MONROE...EXTREME WESTERN WAYNE AND NORTH CENTRAL
ONTARIO COUNTIES...

AT 822 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM WEBSTER TO RUSH...MOVING NORTHEAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MENDON AND FAIRPORT BY 835 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4297 7772 4299 7773 4316 7760 4326 7747
      4328 7740 4328 7734 4304 7733 4295 7749
TIME...MOT...LOC 0023Z 245DEG 21KT 4321 7738 4298 7761

$$

RSH

000 
WWUS51 KBUF 260041
SVSBUF

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

NYC055-069-117-260050-
/O.CAN.KBUF.SV.W.0055.000000T0000Z-090726T0100Z/
ONTARIO NY-WAYNE NY-MONROE NY-
841 PM EDT SAT JUL 25 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE...EXTREME
WESTERN WAYNE AND NORTH CENTRAL ONTARIO COUNTIES IS CANCELLED...

AT 840 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAD WEAKENED AND WERE NO 
LONGER SEVERE...THUS THE WARNING HAS BEEN CANCELLED.

WHILE THE STORMS HAVE WEAKENED...RADAR INDICATED THAT HEAVY RAIN AND 
GUSTY WINDS WERE STILL POSSIBLE FROM THESE THUNDERSTORM.

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

LAT...LON 4297 7772 4299 7773 4316 7760 4326 7747
      4328 7740 4328 7734 4304 7733 4295 7749
TIME...MOT...LOC 0040Z 245DEG 21KT 4325 7725 4302 7748

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 8:07 PM EDT	Special Marine Warning	BUF		76 min
Jul 25, 9:35 PM EDT	Special Marine Warning	BUF		55 min
Jul 26, 1:51 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Wyoming	39 min
Jul 26, 3:12 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	50 min
Jul 26, 3:45 PM EDT	Special Marine Warning	BUF		57 min
Jul 26, 4:48 PM EDT	Areal Flood Advisory	BUF	Cayuga, Ontario, Wayne	117 min
Jul 26, 5:02 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	58 min
Jul 26, 5:45 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga	35 min
Jul 26, 6:05 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	55 min
Jul 26, 6:59 PM EDT	Tornado Warning	BUF	Cattaraugus	46 min
Jul 26, 7:24 PM EDT	Special Marine Warning	BUF		48 min
Jul 26, 7:46 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	37 min

Nearby

Severe Thunderstorm Warnings in New York, 2009 Every 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.