Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 96, NWS Buffalo, NY

August 11, 2021Cattaraugus County, Chautauqua County, Erie County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 11, 2021, 6:09 AM EDT for Cattaraugus County, Chautauqua County, Erie County, New York. It was in force for 51 min. 6 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: Aug 11, 2021, 6:09 AM EDT (10:09 UTC)
Expired: Aug 11, 2021, 7:00 AM EDT
In force: 51 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY

The radar

The Buffalo radar (KBUF), 58 km from the middle of the area, began a volume at 10:13 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
Aug 11, 6:12 AM EDT	MARINE TSTM WIND 54	2 Nw Dunkirk, NY	AT DUNKIRK LIGHTHOUSE.
Aug 11, 6:12 AM EDT	MARINE TSTM WIND 62	2 Nw Dunkirk, NY	CORRECTS PREVIOUS MARINE TSTM WIND REPORT FROM 2 NW DUNKIRK. AT DUNKIRK LIGHTHOUSE.
Aug 11, 6:17 AM EDT	TSTM WND GST 55	3 Ene Dunkirk, NY	AT DUNKIRK AIRPORT.
Aug 11, 6:21 AM EDT	TSTM WND DMG	1 E Silver Creek, NY	TREE DOWN NEAR ROUTE 20 IN HANOVER.
Aug 11, 6:31 AM EDT	TSTM WND DMG	1 S North Collins, NY	TREE DOWN ON GOWANDA STATE ROAD NEAR NORTH COLLINS. NORTHBOUND AND SOUTHBOUND LANES CLOSED AT SHIRLEY RD. TIME BASED ON RADAR.
Aug 11, 6:36 AM EDT	TSTM WND DMG	4 Ne Angola On The Lake, NY	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF. TIME BASED ON RADAR.

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, 10.2 hours before the alert went out and 59 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: 1071 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

130 
WUUS51 KBUF 111009
SVRBUF
NYC009-013-029-111100-
/O.NEW.KBUF.SV.W.0096.210811T1009Z-210811T1100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
609 AM EDT Wed Aug 11 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cattaraugus County in western New York...
  Southwestern Erie County in western New York...
  Northeastern Chautauqua County in western New York...

* Until 700 AM EDT.

* At 608 AM EDT, a severe thunderstorm was located near Lake Erie
  State Park, or near Dunkirk, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Dunkirk, Fredonia, Evans, Eden, Gowanda, Silver Creek, Angola,
  North Collins, Lake Erie State Park and Derby.

This includes Interstate 90 between exits 59 and 57A.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4244 7950 4253 7939 4260 7919 4264 7916
      4267 7912 4272 7909 4276 7898 4279 7893
      4250 7878 4235 7953 4241 7957
TIME...MOT...LOC 1008Z 249DEG 42KT 4251 7944 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Reynolds

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:29 PM EDT	Special Weather Statement	BUF	Jefferson	31 min
Aug 10, 10:04 PM EDT	Special Weather Statement	BUF	Lewis	41 min
Aug 10, 10:47 PM EDT	Flash Flood Warning	BUF	Jefferson, Lewis	5 hr
Aug 11, 4:38 AM EDT	Special Weather Statement	BUF	Chautauqua, Erie, Niagara	52 min
Aug 11, 5:37 AM EDT	Special Weather Statement	BUF	Chautauqua	53 min
Aug 11, 5:41 AM EDT	Special Marine Warning	BUF		64 min
Aug 11, 6:27 AM EDT	Special Marine Warning	BUF		93 min
Aug 11, 6:40 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	65 min
Aug 11, 6:48 AM EDT	Special Marine Warning	BUF		42 min
Aug 11, 7:16 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Genesee, Livingston, Monroe, Wyoming	59 min
Aug 11, 7:39 AM EDT	Special Weather Statement	BUF	Genesee, Monroe	81 min
Aug 11, 7:46 AM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Orleans	50 min
Aug 11, 7:55 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	50 min
Aug 11, 8:09 AM EDT	Special Marine Warning	BUF		96 min
Aug 11, 8:25 AM EDT	Special Weather Statement	BUF	Wayne	65 min
Aug 11, 9:18 AM EDT	Special Weather Statement	BUF	Oswego	27 min
Aug 11, 1:44 PM EDT	Small Craft Advisory	BUF		6 hr
Aug 11, 6:52 PM EDT	Special Weather Statement	BUF	Chautauqua	38 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.