Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Buffalo, NY

June 20, 2021Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 20, 2021, 11:23 PM EDT for Chautauqua County, New York. It was in force for 52 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 20, 2021, 11:23 PM EDT (03:23 UTC)
Expired: Jun 21, 2021, 12:15 AM EDT
In force: 52 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 95 km from the middle of the area, began a volume at 03:27 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 20, 11:24 PM EDT	TSTM WND DMG	3 W Chautauqua, NY	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 W CHAUTAUQUA. TREE DOWN ON POWER LINES.
Jun 20, 11:38 PM EDT	HAIL 1.25	5 S Ripley, NY

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, 3.4 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: 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.

831 
WUUS51 KBUF 210323
SVRBUF
NYC013-210415-
/O.NEW.KBUF.SV.W.0021.210621T0323Z-210621T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1123 PM EDT Sun Jun 20 2021

The National Weather Service in Buffalo has issued a

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

* Until 1215 AM EDT..

* At 1123 PM EDT, a severe thunderstorm was located near North East,
  or 15 miles east of Erie, moving northeast at 45 mph.

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

  SOURCE...Trained weather spotters.

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Dunkirk, Fredonia, Westfield, Silver Creek, Mayville, Chautauqua
  Institution, Lake Erie State Park, Findley Lake, SUNY Fredonia and
  Chautauqua.

 This includes the following highways...
 Interstate 90 between exits 61 and 59.
 Interstate 86 between exits 4 and 6.

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 4227 7976 4228 7973 4230 7976 4259 7920
      4240 7906 4231 7906 4208 7976
TIME...MOT...LOC 0323Z 241DEG 39KT 4218 7978 

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

Mitchell

1 follow-up statement

298 
WWUS51 KBUF 210354
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1154 PM EDT Sun Jun 20 2021

NYC013-210415-
/O.CON.KBUF.SV.W.0021.000000T0000Z-210621T0415Z/
Chautauqua NY-
1154 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR CENTRAL CHAUTAUQUA COUNTY...

At 1154 PM EDT, a severe thunderstorm was located over Westfield, or
16 miles southwest of Fredonia, moving northeast at 30 mph.

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

SOURCE...Trained weather spotters.

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Dunkirk, Fredonia, Westfield, Silver Creek, Mayville, Lake Erie State
Park, SUNY Fredonia, Portland, Sheridan and Ripley.

 This includes Interstate 90 between exits 60 and 59.
 
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 4259 7920 4240 7906 4231 7906 4223 7930
      4227 7973 4228 7974 4228 7973 4230 7976
TIME...MOT...LOC 0354Z 233DEG 27KT 4231 7960 

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

Mitchell

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 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, 3:18 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.