Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Buffalo, NY

June 9, 2021Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 9, 2021, 3:02 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 9, 2021, 3:02 PM EDT (19:02 UTC)
Expired: Jun 9, 2021, 3:45 PM EDT
In force: 43 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 101 km from the middle of the area, began a volume at 19:04 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.0 hours before the alert went out and 98 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: 68 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

658 
WUUS51 KBUF 091902
SVRBUF
NYC003-009-091945-
/O.NEW.KBUF.SV.W.0010.210609T1902Z-210609T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
302 PM EDT Wed Jun 9 2021

The National Weather Service in Buffalo has issued a

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

* Until 345 PM EDT..

* At 301 PM EDT, a severe thunderstorm was located near Weston Mills,
  or 9 miles east of Olean, moving south 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...
  Weston Mills, Bolivar, Portville, Alma, Richburg, Haskell Flats,
  West Clarksville, Little Genesee and Ceres.

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 4216 7839 4220 7816 4200 7805 4200 7836
TIME...MOT...LOC 1901Z 346DEG 17KT 4211 7826 

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

Mitchell

1 follow-up statement

024 
WWUS51 KBUF 091944
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
344 PM EDT Wed Jun 9 2021

NYC003-009-091952-
/O.EXP.KBUF.SV.W.0010.000000T0000Z-210609T1945Z/
Cattaraugus NY-Allegany NY-
344 PM EDT Wed Jun 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS AND
SOUTHWESTERN ALLEGANY COUNTIES WILL EXPIRE AT 345 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, a flash 
flood warning remains in effect for this area with heavy rain still 
falling with this thunderstorm. 

LAT...LON 4216 7839 4220 7816 4200 7805 4200 7836
TIME...MOT...LOC 1942Z 346DEG 17KT 4193 7820 

$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 1:28 PM EDT	Special Weather Statement	BUF	Cattaraugus	92 min
Jun 9, 2:33 PM EDT	Special Weather Statement	BUF	Allegany	27 min
Jun 9, 2:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	25 min
Jun 9, 3:09 PM EDT	Special Weather Statement	BUF	Cattaraugus	66 min
Jun 9, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	57 min
Jun 9, 3:32 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jun 9, 4:00 PM EDT	Flash Flood Warning	BUF	Cattaraugus	3 hr
Jun 9, 4:14 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	61 min
Jun 9, 4:35 PM EDT	Special Weather Statement	BUF	Chautauqua	40 min
Jun 9, 5:04 PM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
Jun 9, 5:13 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	47 min
Jun 9, 5:41 PM EDT	Special Weather Statement	BUF	Cattaraugus	64 min
Jun 9, 5:56 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	33 min
Jun 9, 6:22 PM EDT	Flash Flood Warning	BUF	Cattaraugus	116 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.