Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Buffalo, NY

June 21, 2021Livingston County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 21, 2021, 5:48 AM EDT for Livingston County, Ontario County, New York. It was in force for 42 min. 5 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, 5:48 AM EDT (09:48 UTC)
Expired: Jun 21, 2021, 6:30 AM EDT
In force: 42 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 102 km from the middle of the area, began a volume at 09:47 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, 5:50 AM EDT	TSTM WND DMG	2 E Mount Morris, NY	TREES DOWN.
Jun 21, 6:04 AM EDT	TSTM WND DMG	West Bloomfield, NY	TREES DOWN.
Jun 21, 6:15 AM EDT	TSTM WND DMG	West Bloomfield, NY	MULTIPLE TREES AND POWERLINES DOWN ALONG ROUTE 5 IN WEST BLOOMFIELD. REPORTS OF DOWNED TREE LIMBS IN EAST BLOOMFIELD, BUT NO TREES FULLY DOWN.
Jun 21, 6:20 AM EDT	TSTM WND DMG	3 E Holcomb, NY	MULTIPLE TREES DOWN ALONG MCCANN ROAD IN CANANDAIGUA.
Jun 21, 6:25 AM EDT	TSTM WND DMG	4 Se Canandaigua, NY	REPORTS OF 2 DIFFERENT AREAS OF DOWNED TREES AND POWERLINES AROUND THE INTERSECTION OF TURNER RD AND MIDDLE ROAD IN GORHAM.

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 00:00Z, 9.8 hours before the alert went out and 99 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: 315 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1222 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

369 
WUUS51 KBUF 210948
SVRBUF
NYC051-069-211030-
/O.NEW.KBUF.SV.W.0023.210621T0948Z-210621T1030Z/

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

The National Weather Service in Buffalo has issued a

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

* Until 630 AM EDT..

* At 545 AM EDT, a severe thunderstorm was located near Mount Morris,
  or near Geneseo, moving east at 55 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Canandaigua, Geneseo, Letchworth State Park, Avon, Mount Morris,
  Victor, Conesus, Bristol, Lima and Clifton Springs.

 This includes the following highways...
 Interstate 390 between exits 6 and 10.
 Interstate 90 near exit 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4262 7790 4285 7794 4295 7755 4294 7748
      4296 7748 4304 7715 4276 7707 4276 7731
      4271 7735 4266 7737
TIME...MOT...LOC 0945Z 251DEG 46KT 4277 7787 

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

Apffel

2 follow-up statements

138 
WWUS51 KBUF 211007
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
607 AM EDT Mon Jun 21 2021

NYC051-069-211030-
/O.CON.KBUF.SV.W.0023.000000T0000Z-210621T1030Z/
Livingston NY-Ontario NY-
607 AM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM EDT
FOR NORTHEASTERN LIVINGSTON AND ONTARIO COUNTIES...

At 606 AM EDT, a severe thunderstorm was located near Honeoye, or 12
miles west of Canandaigua, moving east at 55 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Canandaigua, Victor, Bristol, Lima, Clifton Springs, Bloomfield,
Rushville, Honeoye, Hemlock and Farmington.

 This includes Interstate 90 near exit 43.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4266 7766 4293 7761 4294 7759 4294 7748
      4296 7748 4304 7715 4276 7707 4276 7731
      4271 7735 4266 7737
TIME...MOT...LOC 1006Z 251DEG 46KT 4286 7752 

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

Apffel

662 
WWUS51 KBUF 211028
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
628 AM EDT Mon Jun 21 2021

NYC051-069-211037-
/O.EXP.KBUF.SV.W.0023.000000T0000Z-210621T1030Z/
Livingston NY-Ontario NY-
628 AM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON AND
ONTARIO COUNTIES WILL EXPIRE AT 630 AM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4266 7766 4293 7761 4294 7759 4294 7748
      4296 7748 4304 7715 4276 7707 4276 7731
      4271 7735 4266 7737
TIME...MOT...LOC 1027Z 251DEG 46KT 4295 7717 

$$

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, 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, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wyoming	57 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.