Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 54, NWS Buffalo, NY

July 7, 2021Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 7, 2021, 7:03 PM EDT for Allegany County, New York. It was in force for 57 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, 7:03 PM EDT (23:03 UTC)
Expired: Jul 7, 2021, 8:00 PM EDT
In force: 57 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 96 km from the middle of the area, began a volume at 23:02 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	4 Se Angelica, NY	TREE DOWN ON POWER LINES

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, 11.1 hours before the alert went out and 93 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.

379 
WUUS51 KBUF 072303
SVRBUF
NYC003-080000-
/O.NEW.KBUF.SV.W.0054.210707T2303Z-210708T0000Z/

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

The National Weather Service in Buffalo has issued a

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

* Until 800 PM EDT..

* At 703 PM EDT, a severe thunderstorm was located 7 miles east of
  Belfast, or 12 miles north of Wellsville, moving east at 25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Alfred, Belfast, Friendship, Belmont, Angelica, Canaseraga, Almond,
  West Almond and Birdsall.

 This includes Interstate 86 between exits 29 and 33.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large 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.

&&

LAT...LON 4219 7821 4234 7822 4247 7776 4247 7772
      4241 7773 4232 7773 4222 7774
TIME...MOT...LOC 2303Z 256DEG 20KT 4231 7797 

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

Hitchcock

3 follow-up statements

729 
WWUS51 KBUF 072323
SVSBUF

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

NYC003-080000-
/O.CON.KBUF.SV.W.0054.000000T0000Z-210708T0000Z/
Allegany NY-
723 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL ALLEGANY COUNTY...

At 722 PM EDT, a severe thunderstorm was located near Alfred, or 10
miles west of Hornell, moving east at 20 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Alfred, Belfast, Friendship, Belmont, Angelica, Almond, West Almond 
and Birdsall.

 This includes Interstate 86 between exits 29 and 33.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4219 7821 4234 7822 4247 7776 4247 7772
      4241 7773 4232 7773 4222 7774
TIME...MOT...LOC 2322Z 266DEG 18KT 4227 7786 

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

Hitchcock

997 
WWUS51 KBUF 072348
SVSBUF

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

NYC003-080000-
/O.CON.KBUF.SV.W.0054.000000T0000Z-210708T0000Z/
Allegany NY-
748 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL ALLEGANY COUNTY...

At 747 PM EDT, a severe thunderstorm was located near Cuba, or 13
miles northwest of Wellsville, moving east at 20 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Belfast, Friendship, Angelica, and Belmont.

 This includes Interstate 86 between exits 29 and 33.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4219 7821 4234 7822 4247 7776 4247 7772
      4241 7773 4232 7773 4222 7774
TIME...MOT...LOC 2347Z 248DEG 18KT 4225 7815 

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

Hitchcock

067 
WWUS51 KBUF 080000
SVSBUF

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

NYC003-080010-
/O.EXP.KBUF.SV.W.0054.000000T0000Z-210708T0000Z/
Allegany NY-
800 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ALLEGANY COUNTY HAS
EXPIRED...
                
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 has been allowed to expire.

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

LAT...LON 4219 7821 4234 7822 4247 7776 4247 7772
      4241 7773 4232 7773 4222 7774
TIME...MOT...LOC 0000Z 256DEG 20KT 4226 7810 

$$

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, 7:12 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	33 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.