Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Buffalo, NY

June 21, 20215 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 21, 2021, 3:18 PM EDT for 5 counties in New York. It was in force for 57 min. 11 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 21, 2021, 3:18 PM EDT (19:18 UTC)
Expired: Jun 21, 2021, 4:15 PM EDT
In force: 57 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Genesee County, NY, Livingston County, NY, Monroe County, NY, Ontario County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 87 km from the middle of the area, began a volume at 19:18 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 21, 3:20 PM EDT	TSTM WND DMG	Wyoming, NY	TREES ON WIRES IN VILLAGE OF WYOMING.
Jun 21, 3:25 PM EDT	TSTM WND DMG	4 Sse Pavillion, NY	TREES DOWN ON LAKE LEROY ROAD IN COVINGTON.
Jun 21, 3:41 PM EDT	TSTM WND DMG	Avon, NY	MULTIPLE REPORTS OF TREES DOWN INCLUDING TREES ON POWER LINES IN THE VILLAGE OF AVON.
Jun 21, 3:48 PM EDT	TSTM WND DMG	1 Wnw Rush, NY	MULTIPLE POWER LINES AND WIRES DOWN ON ROUTE 15 NEAR INTERSTATE 390 IN RUSH.
Jun 21, 3:50 PM EDT	TSTM WND DMG	1 Ssw Henrietta, NY	EXTENSIVE DAMAGE ALONG I90 NYS THRUWAY NEAR HENRIETTA.
Jun 21, 3:57 PM EDT	TSTM WND DMG	2 Ssw Fairport, NY	LARGE TREE FELL ON HOUSE.
Jun 21, 3:58 PM EDT	TSTM WND DMG	3 Nne Mendon, NY	HALF DOZEN TREES BLOWN DOWN OR UPROOTED. A FEW TREES WERE SNAPPED OFF 20-25 FEET ABOVE GROUND.
Jun 21, 3:58 PM EDT	TSTM WND DMG	3 Se Pittsford, NY	SIGNIFICANT TREE DAMAGE ON I-490 AT ROUTE 96 IN BUSHNELLS BASIN.
Jun 21, 4:00 PM EDT	TSTM WND DMG	2 Sw Fairport, NY	A HOUSE ON DUNCOTT ROAD NEAR HIGHWAY 31 HAD A TREE CUT INTO THE FRONT OF THE HOUSE.
Jun 21, 4:01 PM EDT	TSTM WND DMG	Victor, NY	MULTIPLE REPORTS OF TREES DOWN INCLUDING TREES ON POWER LINES.
Jun 21, 4:02 PM EDT	TSTM WND DMG	2 Ne Mendon, NY	TREES DOWN ON FISHERS ROAD NEAR I-90.

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
Jun 21, 12:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.3 hours before the alert went out and 85 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: 9 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 304 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

550 
WUUS51 KBUF 211918
SVRBUF
NYC037-051-055-069-121-212015-
/O.NEW.KBUF.SV.W.0032.210621T1918Z-210621T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
318 PM EDT Mon Jun 21 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Eastern Wyoming County in western New York...
  Livingston County in western New York...
  Southeastern Genesee County in western New York...
  Southern Monroe County in western New York...
  Northwestern Ontario County in western New York...

* Until 415 PM EDT..

* At 318 PM EDT, a severe thunderstorm was located near Perry, or 10
  miles north of Letchworth State Park, moving east at 45 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Rochester, Batavia, Canandaigua, Geneseo, East Rochester, Fairport,
  Brighton, Letchworth State Park, Henrietta and Penfield.

 This includes the following highways...
 Interstate 390 between exits 6 and 12.
 Interstate 90 between exits 47 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4300 7824 4317 7743 4307 7737 4304 7737
      4303 7735 4278 7720 4259 7810
TIME...MOT...LOC 1918Z 250DEG 40KT 4279 7804 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel

2 follow-up statements

112 
WWUS51 KBUF 211939
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
339 PM EDT Mon Jun 21 2021

NYC037-051-055-069-121-212015-
/O.CON.KBUF.SV.W.0032.000000T0000Z-210621T2015Z/
Wyoming NY-Livingston NY-Genesee NY-Monroe NY-Ontario NY-
339 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN WYOMING...NORTHERN LIVINGSTON...SOUTHEASTERN
GENESEE...SOUTHERN MONROE AND NORTHWESTERN ONTARIO COUNTIES...

At 338 PM EDT, a severe thunderstorm was located near Avon, or near
Geneseo, moving east at 45 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Rochester, Canandaigua, Geneseo, East Rochester, Fairport, Brighton,
Letchworth State Park, Henrietta, Penfield and Le Roy.

 This includes the following highways...
 Interstate 390 between exits 7 and 12.
 Interstate 90 between exits 47 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4283 7818 4303 7798 4317 7743 4307 7737
      4304 7737 4303 7735 4278 7720 4263 7810
TIME...MOT...LOC 1938Z 250DEG 40KT 4287 7774 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel

226 
WWUS51 KBUF 212011
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
411 PM EDT Mon Jun 21 2021

NYC037-051-055-069-121-212020-
/O.EXP.KBUF.SV.W.0032.000000T0000Z-210621T2015Z/
Wyoming NY-Livingston NY-Genesee NY-Monroe NY-Ontario NY-
411 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WYOMING...
NORTHERN LIVINGSTON...SOUTHEASTERN GENESEE...SOUTHERN MONROE AND
NORTHWESTERN ONTARIO COUNTIES WILL EXPIRE AT 415 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

LAT...LON 4283 7818 4303 7798 4317 7743 4307 7737
      4304 7737 4303 7735 4278 7720 4263 7810
TIME...MOT...LOC 2010Z 250DEG 40KT 4299 7730 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 9:04 PM EDT	Special Weather Statement	BUF	Livingston	26 min
Jun 20, 9:18 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Wyoming	42 min
Jun 20, 9:55 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	39 min
Jun 20, 11:23 PM EDT	Special Marine Warning	BUF		67 min
Jun 20, 11:23 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	52 min
Jun 21, 12:07 AM EDT	Special Marine Warning	BUF		53 min
Jun 21, 12:17 AM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	43 min
Jun 21, 12:30 AM EDT	Special Marine Warning	BUF		34 min
Jun 21, 1:47 AM EDT	Special Marine Warning	BUF		43 min
Jun 21, 2:14 AM EDT	Special Weather Statement	BUF	Erie	46 min
Jun 21, 2:30 AM EDT	Special Marine Warning	BUF		45 min
Jun 21, 2:54 AM EDT	Special Weather Statement	BUF	Erie, Genesee	51 min
Jun 21, 3:20 AM EDT	Special Marine Warning	BUF		55 min
Jun 21, 3:36 AM EDT	Special Weather Statement	BUF	Monroe, Orleans	39 min
Jun 21, 3:42 AM EDT	Special Weather Statement	BUF	Chautauqua	63 min
Jun 21, 3:50 AM EDT	Special Marine Warning	BUF		55 min
Jun 21, 4:12 AM EDT	Special Weather Statement	BUF	Chautauqua	48 min
Jun 21, 4:19 AM EDT	Special Marine Warning	BUF		26 min
Jun 21, 4:28 AM EDT	Beach Hazards Statement	BUF	Cayuga, Chautauqua, Erie, Jefferson, Monroe, Niagara and 3 more	42 hr
Jun 21, 4:31 AM EDT	Special Weather Statement	BUF	Cattaraugus, Erie, Genesee, Wyoming	44 min
Jun 21, 4:48 AM EDT	Special Marine Warning	BUF		42 min
Jun 21, 5:15 AM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Livingston, Wyoming	75 min
Jun 21, 5:48 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	42 min
Jun 21, 6:25 AM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	50 min
Jun 21, 6:33 AM EDT	Special Marine Warning	BUF		57 min
Jun 21, 6:55 AM EDT	Special Weather Statement	BUF	Oswego	50 min
Jun 21, 7:15 AM EDT	Special Marine Warning	BUF		30 min
Jun 21, 7:20 AM EDT	Special Weather Statement	BUF	Jefferson, Lewis, Oswego	55 min
Jun 21, 7:25 AM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	50 min
Jun 21, 1:31 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	43 min
Jun 21, 1:34 PM EDT	Special Marine Warning	BUF		56 min
Jun 21, 1:53 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	67 min
Jun 21, 2:01 PM EDT	Special Marine Warning	BUF		44 min
Jun 21, 2:18 PM EDT	Severe Thunderstorm Warning	BUF	Erie	42 min
Jun 21, 2:18 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	42 min
Jun 21, 2:44 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	46 min
Jun 21, 3:07 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	53 min
Jun 21, 3:55 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	50 min
Jun 21, 3:58 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Ontario, Wayne	47 min
Jun 21, 4:25 PM EDT	Special Marine Warning	BUF		77 min
Jun 21, 4:35 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	55 min
Jun 21, 5:02 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	58 min
Jun 21, 5:26 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	64 min
Jun 21, 6:21 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	26 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.