Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 64, NWS Buffalo, NY

August 4, 2009Jefferson County, Lewis County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2009, 7:10 PM EDT for Jefferson County, Lewis County, New York. It was in force for 65 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
Aug 4, 2009, 7:10 PM EDT (23:10 UTC)
Expired
Aug 4, 2009, 8:15 PM EDT
In force
65 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon

Counties Jefferson County, NY, Lewis County, NY

The radar

The Ft Drum radar (KTYX), 45 km from the middle of the area, began a volume at 23:12 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 4, 7:20 PM EDTTSTM WND DMGPhiladelphia, NY14X80 TRAILER TIPPED OVER ON A CAR
Aug 4, 7:31 PM EDTTSTM WND DMGAntwerp, NYTREES DOWN

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

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 11.2 hours before the alert went out and 218 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, Albany, NY at 12:00Z on 2009-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Albany, NY at 12:00Z on 2009-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1014 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
46 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 042310
SVRBUF
NYC045-049-050015-
/O.NEW.KBUF.SV.W.0064.090804T2310Z-090805T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
710 PM EDT TUE AUG 4 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN JEFFERSON COUNTY IN CENTRAL NEW YORK
  NORTHEASTERN LEWIS COUNTY IN CENTRAL NEW YORK

* UNTIL 815 PM EDT

* AT 707 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 18 MILES NORTH OF FORT DRUM 
  TO CALCIUM...AND MOVING EAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CALCIUM BY 715 PM EDT...
  FORT DRUM BY 725 PM EDT...
  WEST CARTHAGE AND CARTHAGE BY 745 PM EDT...
  INDIAN RIVER BY 815 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...HAIL...VERY HEAVY RAIN AND DEADLY 
CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4439 7584 4409 7515 4395 7515 4397 7608
TIME...MOT...LOC 2309Z 268DEG 20KT 4431 7568 4405 7590

$$

TJP
2 follow-up statements
000 
WWUS51 KBUF 042330
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
730 PM EDT TUE AUG 4 2009

NYC045-049-050015-
/O.CON.KBUF.SV.W.0064.000000T0000Z-090805T0015Z/
LEWIS NY-JEFFERSON NY-
730 PM EDT TUE AUG 4 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHEASTERN JEFFERSON AND NORTHEASTERN LEWIS COUNTIES...

AT 728 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM ANTWERP TO FORT DRUM...
MOVING EAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  DEFERIET BY 735 PM EDT...
  WEST CARTHAGE AND CARTHAGE BY 740 PM EDT...
  CARTHAGE BY 745 PM EDT...
  NATURAL BRIDGE BY 800 PM EDT...
  INDIAN RIVER AND HARRISVILLE BY 815 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...VERY HEAVY RAIN...HAIL...AND DEADLY 
CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4397 7591 4431 7565 4409 7515 4395 7515
TIME...MOT...LOC 2330Z 268DEG 20KT 4423 7558 4408 7571

$$

TJP
000 
WWUS51 KBUF 050016
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
816 PM EDT TUE AUG 4 2009

NYC045-049-050025-
/O.EXP.KBUF.SV.W.0064.000000T0000Z-090805T0015Z/
LEWIS NY-JEFFERSON NY-
816 PM EDT TUE AUG 4 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON AND
NORTHEASTERN LEWIS COUNTIES HAS EXPIRED...

AT 815 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE SEVERE 
THUNDERSTORMS THAT PROMPTED THE WARNING HAVE EXITED THE WARNED 
AREA...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.
HOWEVER...THUNDERSTORMS WILL CONTINUE TO PRODUCE HEAVY RAIN...SMALL 
HAIL...AND GUSTY WINDS THROUGH 9 PM EDT. 

LAT...LON 4397 7591 4431 7565 4409 7515 4395 7515
TIME...MOT...LOC 2330Z 268DEG 20KT 4423 7558 4408 7571

$$

TJP

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 4:23 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Wyoming52 min
Aug 4, 5:35 PM EDTSevere Thunderstorm WarningBUFErie, Livingston, Monroe, Ontario, Wyoming55 min
Aug 4, 6:55 PM EDTSpecial Marine WarningBUF65 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.