Alert archive / New York / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 21, NWS Buffalo, NY

May 21, 2013Monroe County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 21, 2013, 3:58 PM EDT for Monroe County, New York. It was in force for 47 min. 5 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, 3:58 PM EDT (19:58 UTC)
Expired: May 21, 2013, 4:45 PM EDT
In force: 47 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Monroe County, NY

The radar

The Buffalo radar (KBUF), 88 km from the middle of the area, began a volume at 19:59 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
May 21, 3:58 PM EDT	HAIL 1.75	3 N Brockport, NY
May 21, 3:59 PM EDT	HAIL 0.75	1 Sse Walker, NY
May 21, 4:03 PM EDT	HAIL 1	1 Sse Walker, NY
May 21, 4:07 PM EDT	HAIL 1	1 N Hilton, NY
May 21, 4:07 PM EDT	HAIL 1.5	Hilton, NY

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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.0 hours before the alert went out and 86 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: 1788 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.9

Open this sounding in Storm Lab

The text

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

905 
WUUS51 KBUF 211958
SVRBUF
NYC055-212045-
/O.NEW.KBUF.SV.W.0021.130521T1958Z-130521T2045Z/

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

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MONROE COUNTY IN WESTERN NEW YORK

* UNTIL 445 PM EDT

* AT 354 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO
  GOLF BALL SIZE.  THIS STORM WAS LOCATED NEAR BROCKPORT...AND MOVING
  NORTHEAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  HAMLIN BEACH...
  HILTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4335 7783 4335 7776 4333 7771 4331 7770
      4324 7754 4323 7753 4320 7769 4321 7795
      4331 7799 4336 7791
TIME...MOT...LOC 1958Z 236DEG 11KT 4327 7793

$$

WOOD

1 follow-up statement

511 
WWUS51 KBUF 212023
SVSBUF

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

NYC055-212032-
/O.CAN.KBUF.SV.W.0021.000000T0000Z-130521T2045Z/
MONROE NY-
423 PM EDT TUE MAY 21 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MONROE COUNTY IS
CANCELLED...

AT 422 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 CANCELLED.

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

LAT...LON 4335 7783 4335 7776 4333 7771 4331 7770
      4324 7754 4323 7753 4320 7769 4321 7795
      4331 7799 4336 7791
TIME...MOT...LOC 2022Z 247DEG 20KT 4334 7761

$$

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, 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, 5:34 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	56 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.