Alert archive / New York / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 24, NWS Buffalo, NY

May 21, 2013Jefferson County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 21, 2013, 5:34 PM EDT for Jefferson County, New York. It was in force for 56 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: May 21, 2013, 5:34 PM EDT (21:34 UTC)
Expired: May 21, 2013, 6:30 PM EDT
In force: 56 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Jefferson County, NY

The radar

The Ft Drum radar (KTYX), 40 km from the middle of the area, began a volume at 21:34 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 21, 6:10 PM EDT	TSTM WND DMG	Sackets Harbor, NY	TREE DOWN
May 21, 6:22 PM EDT	TSTM WND DMG	1 E Hubbard Crossing, NY	TREE REPORTED 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 21, 1:40 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.6 hours before the alert went out and 230 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: 98 J/kg
Mixed-layer CIN: -172 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

051 
WUUS51 KBUF 212134
SVRBUF
NYC045-212230-
/O.NEW.KBUF.SV.W.0024.130521T2134Z-130521T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
534 PM EDT TUE MAY 21 2013

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

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

* UNTIL 630 PM EDT

* AT 530 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 17 MILES NORTH OF CLAYTON TO 11
  MILES WEST OF CLAYTON TO 16 MILES NORTHWEST OF STONY POINT...AND
  MOVING EAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  CLAYTON...
  STONY POINT...
  HENDERSON HARBOR...
  WATERTOWN...
  WEST CARTHAGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4422 7544 4411 7554 4407 7548 4397 7555
      4388 7584 4380 7585 4372 7578 4384 7631
      4391 7622 4387 7621 4390 7614 4398 7622
      4395 7628 4401 7631 4418 7626 4424 7612
      4424 7615 4429 7616 4434 7605 4440 7584
TIME...MOT...LOC 2134Z 283DEG 41KT 4448 7605 4419 7624
          4400 7644

$$

TMA

2 follow-up statements

204 
WWUS51 KBUF 212201
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
601 PM EDT TUE MAY 21 2013

NYC045-212230-
/O.CON.KBUF.SV.W.0024.000000T0000Z-130521T2230Z/
JEFFERSON NY-
601 PM EDT TUE MAY 21 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR JEFFERSON COUNTY...

AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 11 MILES NORTHEAST OF 
ALEXANDRIA BAY TO LA FARGEVILLE TO SACKETS HARBOR...MOVING EAST AT 
45 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  LORRAINE...
  WORTH...
  DEFERIET...
  WEST CARTHAGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4422 7544 4411 7554 4407 7548 4397 7555
      4388 7584 4380 7585 4372 7578 4384 7631
      4391 7622 4387 7621 4390 7614 4398 7622
      4395 7628 4401 7631 4418 7626 4424 7612
      4424 7615 4429 7616 4434 7605 4440 7584
TIME...MOT...LOC 2201Z 282DEG 39KT 4442 7567 4413 7586
          4394 7607

$$

TMA

007 
WWUS51 KBUF 212236
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
636 PM EDT TUE MAY 21 2013

NYC045-212246-
/O.EXP.KBUF.SV.W.0024.000000T0000Z-130521T2230Z/
JEFFERSON NY-
636 PM EDT TUE MAY 21 2013

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON COUNTY HAS
EXPIRED...

AT 636 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED THAT THE LINE OF 
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 900 PM EDT
TUESDAY EVENING FOR WESTERN NEW YORK.

LAT...LON 4422 7544 4411 7554 4407 7548 4397 7555
      4388 7584 4380 7585 4372 7578 4384 7631
      4391 7622 4387 7621 4390 7614 4398 7622
      4395 7628 4401 7631 4418 7626 4424 7612
      4424 7615 4429 7616 4434 7605 4440 7584
TIME...MOT...LOC 2201Z 282DEG 39KT 4442 7567 4413 7586
          4394 7607

$$

TMA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 10:53 PM EDT	Special Marine Warning	BUF		52 min
May 20, 11:02 PM EDT	Special Weather Statement	BUF	Niagara	43 min
May 21, 12:39 AM EDT	Special Marine Warning	BUF		51 min
May 21, 12:50 AM EDT	Special Marine Warning	BUF		55 min
May 21, 1:01 AM EDT	Special Weather Statement	BUF	Oswego	59 min
May 21, 1:27 AM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	48 min
May 21, 1:40 AM EDT	Special Marine Warning	BUF		50 min
May 21, 1:49 AM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	41 min
May 21, 1:59 AM EDT	Special Weather Statement	BUF	Lewis	61 min
May 21, 2:13 AM EDT	Severe Thunderstorm Warning	BUF	Lewis	32 min
May 21, 12:32 PM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	58 min
May 21, 12:34 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	26 min
May 21, 3:02 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Wayne	58 min
May 21, 3:36 PM EDT	Severe Thunderstorm Warning	BUF	Wayne	54 min
May 21, 3:57 PM EDT	Special Weather Statement	BUF	Wyoming	33 min
May 21, 3:58 PM EDT	Special Marine Warning	BUF		62 min
May 21, 3:58 PM EDT	Severe Thunderstorm Warning	BUF	Monroe	47 min
May 21, 4:11 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Wyoming	49 min
May 21, 4:47 PM EDT	Special Weather Statement	BUF	Ontario	28 min
May 21, 4:58 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	47 min
May 21, 5:05 PM EDT	Special Marine Warning	BUF		85 min
May 21, 5:14 PM EDT	Special Marine Warning	BUF		61 min
May 21, 5:22 PM EDT	Special Marine Warning	BUF		83 min
May 21, 5:45 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	15 min
May 21, 5:48 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	57 min
May 21, 7:14 PM EDT	Special Weather Statement	BUF	Lewis	31 min
May 21, 7:40 PM EDT	Special Marine Warning	BUF		35 min

Nearby

Severe Thunderstorm Warnings in New York, 2013 Every severe thunderstorm warning in 2013

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.