Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 44, NWS Buffalo, NY

June 30, 2021Livingston County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 30, 2021, 2:15 PM EDT for Livingston County, Ontario County, New York. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 30, 2021, 2:15 PM EDT (18:15 UTC)
Expired: Jun 30, 2021, 2:50 PM EDT
In force: 35 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 120 km from the middle of the area, began a volume at 18:19 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 30, 11:47 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.3 hours before the alert went out and 117 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: 366 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

396 
WUUS51 KBUF 301815
SVRBUF
NYC051-069-301915-
/O.NEW.KBUF.SV.W.0044.210630T1815Z-210630T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
215 PM EDT Wed Jun 30 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Livingston County in western New York...
  Ontario County in western New York...

* Until 315 PM EDT..

* At 215 PM EDT, a severe thunderstorm was located over Honeoye, or
  14 miles southwest of Canandaigua, moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Geneva, Canandaigua, Bristol, Lima, Clifton Springs, Phelps,
  Bloomfield, Rushville, Honeoye and Hemlock.

 This includes Interstate 90 near exit 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4269 7763 4291 7765 4297 7696 4287 7696
      4286 7698 4276 7697 4276 7731 4270 7736
TIME...MOT...LOC 1815Z 263DEG 24KT 4279 7753 

HAIL...1.00IN
WIND...60MPH
 
$$

Mitchell

2 follow-up statements

452 
WWUS51 KBUF 301839
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
239 PM EDT Wed Jun 30 2021

NYC051-301849-
/O.CAN.KBUF.SV.W.0044.000000T0000Z-210630T1915Z/
Livingston NY-
239 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western New York.

LAT...LON 4269 7750 4279 7747 4295 7721 4297 7696
      4287 7696 4286 7698 4276 7697 4276 7731
      4270 7736
TIME...MOT...LOC 1839Z 255DEG 31KT 4289 7719 

$$

NYC069-301915-
/O.CON.KBUF.SV.W.0044.000000T0000Z-210630T1915Z/
Ontario NY-
239 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR CENTRAL ONTARIO COUNTY...

At 239 PM EDT, a severe thunderstorm was located near Canandaigua,
moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Geneva, Canandaigua, Clifton Springs, Phelps, Rushville, Gorham,
Seneca Lake State Park, Seneca Castle, Cheshire and Cottage City.

 This includes Interstate 90 near exit 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4269 7750 4279 7747 4295 7721 4297 7696
      4287 7696 4286 7698 4276 7697 4276 7731
      4270 7736
TIME...MOT...LOC 1839Z 255DEG 31KT 4289 7719 

HAIL...<.75IN
WIND...60MPH
 
$$

Mitchell

657 
WWUS51 KBUF 301850
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
250 PM EDT Wed Jun 30 2021

NYC069-301900-
/O.CAN.KBUF.SV.W.0044.000000T0000Z-210630T1915Z/
Ontario NY-
250 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ONTARIO COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western New York.

LAT...LON 4269 7750 4279 7747 4295 7721 4297 7696
      4287 7696 4286 7698 4276 7697 4276 7731
      4270 7736
TIME...MOT...LOC 1847Z 263DEG 24KT 4290 7709 

$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 9:51 PM EDT	Special Weather Statement	BUF	Cattaraugus	39 min
Jun 29, 10:33 PM EDT	Special Weather Statement	BUF	Cattaraugus	42 min
Jun 30, 11:30 AM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	45 min
Jun 30, 12:15 PM EDT	Special Weather Statement	BUF	Onondaga	15 min
Jun 30, 1:37 PM EDT	Special Weather Statement	BUF	Livingston	53 min
Jun 30, 2:47 PM EDT	Special Weather Statement	BUF	Allegany	43 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.