Alert archive / New York / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 7, NWS Buffalo, NY

May 9, 2009Jefferson County, Lewis County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 9, 2009, 1:48 PM EDT for Jefferson County, Lewis County, New York. It was in force for 57 min. 4 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: May 9, 2009, 1:48 PM EDT (17:48 UTC)
Expired: May 9, 2009, 2:45 PM EDT
In force: 57 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Jefferson County, NY, Lewis County, NY

The radar

The Ft Drum radar (KTYX), 32 km from the middle of the area, began a volume at 17:50 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
May 9, 2:03 PM EDT	TSTM WND DMG	Natural Bridge, NY	TREES DOWN
May 9, 2:12 PM EDT	TSTM WND DMG	Harrisville, NY	TREES DOWN
May 9, 2:12 PM EDT	TSTM WND DMG	Natural Bridge, NY	TREES DOWN
May 9, 2:32 PM EDT	TSTM WND DMG	Harrisville, NY	TREES 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.

Issued	Product	Office	Lasted
May 9, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.8 hours before the alert went out and 201 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: 2 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 159 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 091748
SVRBUF
NYC045-049-091845-
/O.NEW.KBUF.SV.W.0007.090509T1748Z-090509T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
148 PM EDT SAT MAY 9 2009

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 245 PM EDT

* AT 146 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 7 MILES
  NORTHWEST OF WEST CARTHAGE...OR NEAR FORT DRUM...AND MOVING EAST AT
  45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NATURAL BRIDGE BY 200 PM EDT...
  HARRISVILLE BY 215 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE 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 4388 7544 4387 7591 4392 7595 4398 7564
      4423 7571 4428 7557 4412 7520 4409 7515
      4392 7514
TIME...MOT...LOC 1748Z 254DEG 39KT 4405 7569

$$

HITCHCOCK

4 follow-up statements

000 
WWUS51 KBUF 091804
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
204 PM EDT SAT MAY 9 2009

NYC045-049-091845-
/O.CON.KBUF.SV.W.0007.000000T0000Z-090509T1845Z/
LEWIS NY-JEFFERSON NY-
204 PM EDT SAT MAY 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR EAST CENTRAL JEFFERSON AND NORTHERN LEWIS COUNTIES...

AT 200 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES EAST OF ANTWERP TO 
CARTHAGE...MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  INDIAN RIVER AND HARRISVILLE BY 210 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE 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 4388 7561 4388 7566 4396 7564 4398 7564
      4423 7571 4428 7557 4412 7520 4409 7515
      4392 7514
TIME...MOT...LOC 1804Z 257DEG 36KT 4421 7541 4400 7546

$$

HITCHCOCK

000 
WWUS51 KBUF 091816
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
216 PM EDT SAT MAY 9 2009

NYC045-091826-
/O.CAN.KBUF.SV.W.0007.000000T0000Z-090509T1845Z/
JEFFERSON NY-
216 PM EDT SAT MAY 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEAST JEFFERSON COUNTY IS 
CANCELLED...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
SATURDAY EVENING FOR WESTERN NEW YORK.

LAT...LON 4392 7514 4392 7556 4401 7552 4401 7551
      4403 7551 4404 7549 4405 7550 4421 7543
      4412 7520 4408 7515
TIME...MOT...LOC 1816Z 257DEG 36KT 4423 7524 4402 7529

$$

NYC049-091845-
/O.CON.KBUF.SV.W.0007.000000T0000Z-090509T1845Z/
LEWIS NY-
216 PM EDT SAT MAY 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR NORTHEASTERN LEWIS COUNTY...

AT 214 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING PENNY SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES 
NORTHEAST OF HARRISVILLE TO INDIAN RIVER...MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  HARRISVILLE AND DIANA BY 220 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE 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 4392 7514 4392 7556 4401 7552 4401 7551
      4403 7551 4404 7549 4405 7550 4421 7543
      4412 7520 4408 7515
TIME...MOT...LOC 1816Z 257DEG 36KT 4423 7524 4402 7529

$$

HITCHCOCK

000 
WWUS51 KBUF 091837
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
237 PM EDT SAT MAY 9 2009

NYC049-091845-
/O.CON.KBUF.SV.W.0007.000000T0000Z-090509T1845Z/
LEWIS NY-
237 PM EDT SAT MAY 9 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR NORTHERN LEWIS COUNTY...

AT 236 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. 
THIS STORM WAS LOCATED NEAR INDIAN RIVER...MOVING NORTHEAST AT 30 
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TOWN OF DIANA THROUGH 245 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.

&&

LAT...LON 4392 7514 4392 7556 4401 7552 4401 7551
      4403 7551 4404 7549 4405 7550 4421 7543
      4412 7520 4408 7515
TIME...MOT...LOC 1836Z 247DEG 28KT 4401 7535

$$

HITCHCOCK

000 
WWUS51 KBUF 091844
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
244 PM EDT SAT MAY 9 2009

NYC049-091855-
/O.EXP.KBUF.SV.W.0007.000000T0000Z-090509T1845Z/
LEWIS NY-
244 PM EDT SAT MAY 9 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEWIS COUNTY HAS
EXPIRED...

AT 245 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
SATURDAY EVENING FOR WESTERN NEW YORK.

LAT...LON 4392 7514 4392 7556 4401 7552 4401 7551
      4403 7551 4404 7549 4405 7550 4421 7543
      4412 7520 4408 7515
TIME...MOT...LOC 1845Z 247DEG 28KT 4404 7526

$$

SFM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 10:22 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	38 min
May 9, 4:07 AM EDT	Wind Advisory	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	20 hr
May 9, 4:27 AM EDT	Gale Warning	BUF		24 hr
May 9, 12:30 PM EDT	Special Marine Warning	BUF		2 hr
May 9, 12:38 PM EDT	Special Marine Warning	BUF		40 min
May 9, 1:12 PM EDT	Special Marine Warning	BUF		25 min
May 9, 1:18 PM EDT	Special Marine Warning	BUF		87 min
May 9, 1:28 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	46 min
May 9, 2:12 PM EDT	Severe Thunderstorm Warning	BUF	Wayne	40 min
May 9, 2:49 PM EDT	Special Marine Warning	BUF		56 min
May 9, 3:22 PM EDT	Special Marine Warning	BUF		53 min
May 9, 4:45 PM EDT	Small Craft Advisory	BUF		33 hr

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.