Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 55, NWS Buffalo, NY

July 7, 2021Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 7, 2021, 7:12 PM EDT for Allegany County, New York. It was in force for 33 min. 1 report 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: Jul 7, 2021, 7:12 PM EDT (23:12 UTC)
Expired: Jul 7, 2021, 7:45 PM EDT
In force: 33 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 120 km from the middle of the area, began a volume at 23:13 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
Jul 7, 7:13 PM EDT	TSTM WND DMG	2 Ssw Mapes, NY	TREE DOWN ON POWER LINES ALONG COUNTY RD 38

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 7, 3:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.2 hours before the alert went out and 117 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: 161 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

094 
WUUS51 KBUF 072312
SVRBUF
NYC003-072345-
/O.NEW.KBUF.SV.W.0055.210707T2312Z-210707T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
712 PM EDT Wed Jul 7 2021

The National Weather Service in Buffalo has issued a

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

* Until 745 PM EDT..

* At 711 PM EDT, a severe thunderstorm was located near Genesee, 
  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...
  Whitesville, Andover, Stannards and Paynesville. 

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 4200 7804 4208 7804 4217 7774 4200 7775
TIME...MOT...LOC 2311Z 255DEG 15KT 4203 7793 

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

Hitchcock

2 follow-up statements

433 
WWUS51 KBUF 072324
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
724 PM EDT Wed Jul 7 2021

NYC003-072345-
/O.CON.KBUF.SV.W.0055.000000T0000Z-210707T2345Z/
Allegany NY-
724 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHEASTERN ALLEGANY COUNTY...

At 723 PM EDT, a severe thunderstorm was located near Genesee, or 8
miles southeast of 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...
Whitesville, Andover, Stannards and Paynesville. 

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 4200 7794 4211 7794 4217 7774 4200 7775
TIME...MOT...LOC 2323Z 258DEG 16KT 4203 7784 

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

Hitchcock

764 
WWUS51 KBUF 072345
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
745 PM EDT Wed Jul 7 2021

NYC003-072355-
/O.EXP.KBUF.SV.W.0055.000000T0000Z-210707T2345Z/
Allegany NY-
745 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALLEGANY COUNTY
HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
the Southern Tier of Western New York.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Buffalo.

LAT...LON 4200 7794 4211 7794 4217 7774 4200 7775
TIME...MOT...LOC 2345Z 255DEG 15KT 4205 7774 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 8:26 PM EDT	Special Weather Statement	BUF	Allegany	64 min
Jul 6, 9:30 PM EDT	Special Weather Statement	BUF	Cayuga	30 min
Jul 7, 12:51 AM EDT	Special Weather Statement	BUF	Chautauqua	39 min
Jul 7, 3:34 AM EDT	Special Weather Statement	BUF	Chautauqua	26 min
Jul 7, 4:00 AM EDT	Special Weather Statement	BUF	Cattaraugus	90 min
Jul 7, 4:17 AM EDT	Special Weather Statement	BUF	Allegany	43 min
Jul 7, 4:38 AM EDT	Beach Hazards Statement	BUF	Monroe, Niagara, Orleans, Wayne	17 hr
Jul 7, 4:39 AM EDT	Small Craft Advisory	BUF		17 hr
Jul 7, 4:48 AM EDT	Special Marine Warning	BUF		42 min
Jul 7, 4:52 AM EDT	Special Weather Statement	BUF	Niagara	38 min
Jul 7, 5:27 AM EDT	Special Weather Statement	BUF	Orleans	48 min
Jul 7, 6:04 AM EDT	Special Weather Statement	BUF	Monroe	41 min
Jul 7, 6:49 AM EDT	Special Weather Statement	BUF	Ontario	41 min
Jul 7, 4:33 PM EDT	Special Weather Statement	BUF	Allegany	42 min
Jul 7, 5:15 PM EDT	Special Weather Statement	BUF	Livingston	30 min
Jul 7, 6:10 PM EDT	Special Weather Statement	BUF	Chautauqua	35 min
Jul 7, 6:47 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	58 min
Jul 7, 6:49 PM EDT	Special Marine Warning	BUF		86 min
Jul 7, 6:52 PM EDT	Special Weather Statement	BUF	Allegany	38 min
Jul 7, 6:53 PM EDT	Special Weather Statement	BUF	Allegany	37 min
Jul 7, 7:03 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	57 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.