Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 41, NWS Buffalo, NY

June 29, 2021Livingston County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 29, 2021, 3:18 PM EDT for Livingston County, Wyoming County, New York. It was in force for 45 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: Jun 29, 2021, 3:18 PM EDT (19:18 UTC)
Expired: Jun 29, 2021, 4:03 PM EDT
In force: 45 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 69 km from the middle of the area, began a volume at 19:16 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
Jun 29, 3:40 PM EDT	TSTM WND DMG	1 W Warsaw, NY	FIVE TREES WERE REPORTED DOWN ONTO ROUTE 20A BETWEEN ROUTE 19 AND ROUTE 238.

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, 7.3 hours before the alert went out and 66 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: 627 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

930 
WUUS51 KBUF 291918
SVRBUF
NYC051-121-292015-
/O.NEW.KBUF.SV.W.0041.210629T1918Z-210629T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
318 PM EDT Tue Jun 29 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Eastern Wyoming County in western New York...
  Central Livingston County in western New York...

* Until 415 PM EDT..

* At 318 PM EDT, a severe thunderstorm was located over Warsaw, or 9
  miles northwest of Letchworth State Park, 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...
  Geneseo, Dansville, Letchworth State Park, Perry, Warsaw, Avon,
  Mount Morris, Conesus, Portageville and Varysburg.

 This includes Interstate 390 between exits 5 and 8.
 
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 4257 7826 4276 7834 4287 7802 4286 7796
      4289 7796 4295 7777 4258 7761 4258 7766
      4256 7766
TIME...MOT...LOC 1918Z 250DEG 22KT 4270 7815 

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

Reynolds

2 follow-up statements

169 
WWUS51 KBUF 291947
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
347 PM EDT Tue Jun 29 2021

NYC051-121-292015-
/O.CON.KBUF.SV.W.0041.000000T0000Z-210629T2015Z/
Wyoming NY-Livingston NY-
347 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN WYOMING AND CENTRAL LIVINGSTON COUNTIES...

At 347 PM EDT, a severe thunderstorm was located near Mount Morris,
or near Geneseo, 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...
Geneseo, Letchworth State Park, Perry, Warsaw, Avon, Mount Morris,
Conesus, York, Groveland and Covington.

 This includes Interstate 390 between exits 6 and 8.
 
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 4264 7813 4279 7825 4287 7802 4286 7796
      4289 7796 4295 7777 4263 7764
TIME...MOT...LOC 1947Z 250DEG 22KT 4276 7792 

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

Reynolds

036 
WWUS51 KBUF 292003
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
403 PM EDT Tue Jun 29 2021

NYC051-121-292012-
/O.CAN.KBUF.SV.W.0041.000000T0000Z-210629T2015Z/
Wyoming NY-Livingston NY-
403 PM EDT Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WYOMING AND
CENTRAL LIVINGSTON 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.

LAT...LON 4264 7813 4279 7825 4287 7802 4286 7796
      4289 7796 4295 7777 4263 7764
TIME...MOT...LOC 2000Z 250DEG 22KT 4279 7780 

$$

Reynolds

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 2:05 PM EDT	Special Weather Statement	BUF	Erie	40 min
Jun 29, 2:16 PM EDT	Special Weather Statement	BUF	Cayuga	29 min
Jun 29, 2:49 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Erie, Wyoming	56 min
Jun 29, 3:13 PM EDT	Special Weather Statement	BUF	Livingston, Wyoming	47 min
Jun 29, 3:45 PM EDT	Special Marine Warning	BUF		60 min
Jun 29, 4:08 PM EDT	Special Weather Statement	BUF	Livingston	67 min
Jun 29, 4:39 PM EDT	Special Marine Warning	BUF		66 min
Jun 29, 4:54 PM EDT	Special Weather Statement	BUF	Erie	51 min
Jun 29, 5:47 PM EDT	Special Weather Statement	BUF	Wyoming	43 min
Jun 29, 6:01 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	29 min
Jun 29, 7:26 PM EDT	Special Weather Statement	BUF	Allegany	34 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.