Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Buffalo, NY

June 28, 2021Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 28, 2021, 6:09 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 66 min. 3 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 28, 2021, 6:09 PM EDT (22:09 UTC)
Expired: Jun 28, 2021, 7:15 PM EDT
In force: 66 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 99 km from the middle of the area, began a volume at 22:11 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 28, 6:28 PM EDT	TSTM WND DMG	Friendship, NY	TREES DOWN.
Jun 28, 6:34 PM EDT	TSTM WND DMG	Bolivar, NY	TREES DOWN ON LEATHER RD.
Jun 28, 6:35 PM EDT	TSTM WND DMG	Richburg, NY	TREES DOWN.

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, 10.2 hours before the alert went out and 96 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: 99 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

298 
WUUS51 KBUF 282209
SVRBUF
NYC003-009-282315-
/O.NEW.KBUF.SV.W.0039.210628T2209Z-210628T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
609 PM EDT Mon Jun 28 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cattaraugus County in western New York...
  Southern Allegany County in western New York...

* Until 715 PM EDT..

* At 608 PM EDT, a severe thunderstorm was located near Cuba, or 8
  miles northeast of Olean, moving east at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Olean, Wellsville, Cuba, Weston Mills, Hinsdale, Friendship, Scio,
  Bolivar, Belmont and Angelica.

 This includes Interstate 86 between exits 26 and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4204 7843 4226 7846 4234 7785 4207 7780
TIME...MOT...LOC 2208Z 262DEG 18KT 4215 7829 

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

Mitchell

2 follow-up statements

898 
WWUS51 KBUF 282251
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
651 PM EDT Mon Jun 28 2021

NYC009-282300-
/O.CAN.KBUF.SV.W.0039.000000T0000Z-210628T2315Z/
Cattaraugus NY-
651 PM EDT Mon Jun 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS
COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4228 7831 4234 7785 4207 7780 4205 7830
TIME...MOT...LOC 2250Z 262DEG 18KT 4218 7801 

$$

NYC003-282315-
/O.CON.KBUF.SV.W.0039.000000T0000Z-210628T2315Z/
Allegany NY-
651 PM EDT Mon Jun 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHERN ALLEGANY COUNTY...

At 650 PM EDT, a severe thunderstorm was located near Wellsville,
moving east at 20 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Wellsville, Cuba, Friendship, Scio, Bolivar, Belmont, Angelica,
Richburg, West Almond and Stannards.

 This includes Interstate 86 between exits 28 and 32.
 
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 4228 7831 4234 7785 4207 7780 4205 7830
TIME...MOT...LOC 2250Z 262DEG 18KT 4218 7801 

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

Mitchell

494 
WWUS51 KBUF 282314
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
714 PM EDT Mon Jun 28 2021

NYC003-282321-
/O.EXP.KBUF.SV.W.0039.000000T0000Z-210628T2315Z/
Allegany NY-
714 PM EDT Mon Jun 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ALLEGANY COUNTY WILL
EXPIRE AT 715 PM EDT...
                
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 will be allowed to expire.  However gusty 
winds up to 30 mph are still possible with this thunderstorm across 
southeastern Allegany County as it continues to move to the east.

LAT...LON 4228 7831 4234 7785 4207 7780 4205 7830
TIME...MOT...LOC 2311Z 262DEG 18KT 4219 7789 

$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 9:38 AM EDT	Heat Advisory	BUF	Cayuga, Lewis, Livingston, Monroe, Ontario, Oswego and 1 more	10 hr
Jun 28, 2:03 PM EDT	Heat Advisory	BUF	Cayuga, Chautauqua, Erie, Genesee, Livingston, Monroe and 5 more	30 hr
Jun 28, 3:05 PM EDT	Special Weather Statement	BUF	Allegany	40 min
Jun 28, 5:01 PM EDT	Special Weather Statement	BUF	Cattaraugus	44 min
Jun 28, 5:27 PM EDT	Special Weather Statement	BUF	Onondaga	18 min
Jun 28, 5:50 PM EDT	Special Weather Statement	BUF	Onondaga	25 min
Jun 28, 6:03 PM EDT	Special Weather Statement	BUF	Allegany	42 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.