Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Buffalo, NY

June 29, 2021Erie County, Genesee County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 29, 2021, 6:01 PM EDT for Erie County, Genesee County, Wyoming County, New York. It was in force for 29 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: Jun 29, 2021, 6:01 PM EDT (22:01 UTC)
Expired: Jun 29, 2021, 6:30 PM EDT
In force: 29 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Erie County, NY, Genesee County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 35 km from the middle of the area, began a volume at 22:03 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, 6:15 PM EDT	TSTM WND DMG	Sheldon, NY	TREES DOWN ON POWER LINES
Jun 29, 6:20 PM EDT	TSTM WND DMG	Varysburg, NY	TREES DOWN ONTO POWER LINES

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, 10.0 hours before the alert went out and 31 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.

906 
WUUS51 KBUF 292201
SVRBUF
NYC029-037-121-292230-
/O.NEW.KBUF.SV.W.0042.210629T2201Z-210629T2230Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northern Wyoming County in western New York...
  East central Erie County in western New York...
  Southwestern Genesee County in western New York...

* Until 630 PM EDT..

* At 601 PM EDT, a severe thunderstorm was located near Wales Center 
  and moving northeast at 15 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...
  Darien Lakes State Park, Bennington, Alden, Attica, Wales Center,
  Varysburg, Holland, Sheldon, Corfu and Alexander.

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 4261 7848 4271 7864 4299 7840 4281 7805
TIME...MOT...LOC 2201Z 229DEG 15KT 4271 7850 

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

Reynolds

2 follow-up statements

470 
WWUS51 KBUF 292219
SVSBUF

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

NYC029-037-121-292230-
/O.CON.KBUF.SV.W.0042.000000T0000Z-210629T2230Z/
Wyoming NY-Erie NY-Genesee NY-
619 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHERN WYOMING...EAST CENTRAL ERIE AND SOUTHWESTERN GENESEE
COUNTIES...

At 618 PM EDT, a severe thunderstorm was located near Wales Center 
and moving northeast at 15 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...
Darien Lakes State Park, Bennington, Attica, Varysburg, Wales Center,
Sheldon, Alexander, Wyoming, Strykersville and Orangeville Center.

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 4267 7841 4277 7854 4296 7836 4281 7805
TIME...MOT...LOC 2218Z 229DEG 15KT 4276 7842 

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

Reynolds

497 
WWUS51 KBUF 292230
SVSBUF

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

NYC029-037-121-292240-
/O.EXP.KBUF.SV.W.0042.000000T0000Z-210629T2230Z/
Wyoming NY-Erie NY-Genesee NY-
630 PM EDT Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WYOMING...EAST
CENTRAL ERIE AND SOUTHWESTERN GENESEE COUNTIES HAS EXPIRED...
                
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 allowed to expire.

LAT...LON 4267 7841 4277 7854 4296 7836 4281 7805
TIME...MOT...LOC 2230Z 229DEG 15KT 4278 7838 

$$

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, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Wyoming	45 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, 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.