Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Buffalo, NY

May 25, 2021Livingston County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 25, 2021, 3:44 PM EDT for Livingston County, Ontario County, New York. It was in force for 32 min. 1 report 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 25, 2021, 3:44 PM EDT (19:44 UTC)
Expired: May 25, 2021, 4:16 PM EDT
In force: 32 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), 104 km from the middle of the area, began a volume at 19:46 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 25, 3:54 PM EDT	TSTM WND DMG	Livonia, NY	A FEW TREES DOWN IN LIVONIA. TIME ESTIMATED BY RADAR.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.7 hours before the alert went out and 101 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: 6 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

666 
WUUS51 KBUF 251944
SVRBUF
NYC051-069-252030-
/O.NEW.KBUF.SV.W.0004.210525T1944Z-210525T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
344 PM EDT Tue May 25 2021

The National Weather Service in Buffalo has issued a

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

* Until 430 PM EDT..

* At 343 PM EDT, a severe thunderstorm was located over Geneseo,
  moving east at 30 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...
  Canandaigua, Geneseo, Victor, Conesus, Bristol, Lima, Bloomfield,
  Rushville, Hemlock and Honeoye.

 This includes the following highways...
 Interstate 390 between exits 6 and 10.
 Interstate 90 near exit 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 4262 7782 4284 7790 4295 7756 4294 7748
      4297 7748 4303 7726 4277 7715 4276 7722
      4276 7731 4271 7735 4265 7737
TIME...MOT...LOC 1943Z 253DEG 27KT 4278 7777 

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

Welch

1 follow-up statement

219 
WWUS51 KBUF 252016
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
416 PM EDT Tue May 25 2021

NYC051-069-252025-
/O.CAN.KBUF.SV.W.0004.000000T0000Z-210525T2030Z/
Livingston NY-Ontario NY-
416 PM EDT Tue May 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LIVINGSTON AND WESTERN
ONTARIO COUNTIES 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.  However, gusty winds, 
lightning and heavy rain are still possible with this thunderstorm.

LAT...LON 4262 7782 4284 7790 4295 7756 4294 7748
      4297 7748 4303 7726 4277 7715 4276 7722
      4276 7731 4271 7735 4265 7737
TIME...MOT...LOC 2013Z 253DEG 27KT 4285 7745 

$$

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 2:03 PM EDT	Special Weather Statement	BUF	Erie	42 min
May 25, 2:47 PM EDT	Special Weather Statement	BUF	Wyoming	43 min
May 25, 3:25 PM EDT	Special Weather Statement	BUF	Livingston	35 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.