Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 53, NWS Buffalo, NY

July 7, 2021Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 7, 2021, 6:47 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 58 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: Jul 7, 2021, 6:47 PM EDT (22:47 UTC)
Expired: Jul 7, 2021, 7:45 PM EDT
In force: 58 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

The radar

The Buffalo radar (KBUF), 94 km from the middle of the area, began a volume at 22:51 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, 7:03 PM EDT	TSTM WND DMG	3 Ene Panama, NY	TREES DOWN ON POWER LINES.
Jul 7, 7:03 PM EDT	TSTM WND DMG	3 Ene Panama, NY	TREES DOWN ON POWER LINES NEAR DIFFLEY RD
Jul 7, 7:09 PM EDT	TSTM WND DMG	1 Se Bemus Point, NY	TREES DOWN ON POWER LINES ALONG NORTH NESMITH AVE.
Jul 7, 7:09 PM EDT	TSTM WND DMG	1 Se Bemus Point, NY	TREES DOWN ON POWER LINES ALONG NORTH NESMITH AVE
Jul 7, 7:20 PM EDT	TSTM WND DMG	Celoron, NY	TREES DOWN ON POWER LINES ALONG EDITH AVE.
Jul 7, 7:20 PM EDT	TSTM WND DMG	Celoron, NY	TREES DOWN ON POWER LINES ALONG EDITH AVE

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, 10.8 hours before the alert went out and 94 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.

726 
WUUS51 KBUF 072247
SVRBUF
NYC009-013-072345-
/O.NEW.KBUF.SV.W.0053.210707T2247Z-210707T2345Z/

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

The National Weather Service in Buffalo has issued a

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

* Until 745 PM EDT..

* At 646 PM EDT, severe thunderstorms were located along a line 
  extending from Wattsburg to near Sheffield, moving northeast at 45 
  mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Jamestown, Olean, Fredonia, Salamanca, Allegany State Park, 
  Westfield, Lakewood, Falconer, Allegany, Panama, Busti, and 
  Mayville.

 This includes the following highways...
 Interstate 90 between exits 61 and 60.
 Interstate 86 between exits 4 and 26.

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 these storms. 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 4227 7976 4229 7969 4244 7941 4231 7865
      4200 7831 4200 7976
TIME...MOT...LOC 2246Z 248DEG 39KT 4199 7978 4169 7920 

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

Hitchcock

2 follow-up statements

632 
WWUS51 KBUF 072315
SVSBUF

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

NYC009-013-072345-
/O.CON.KBUF.SV.W.0053.000000T0000Z-210707T2345Z/
Cattaraugus NY-Chautauqua NY-
715 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHERN CATTARAUGUS AND CHAUTAUQUA COUNTIES...

At 714 PM EDT, severe thunderstorms were located along a line
extending from Findley Lake to near Scandia, moving northeast at 40
mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Jamestown, Salamanca, Allegany State Park, Lakewood, Falconer, 
Allegany, Mayville, Busti, Frewsburg, Randolph, and Bemus Point.

 This includes Interstate 86 between exits 4 and 24.
 
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 these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4211 7844 4200 7869 4200 7931 4211 7976
      4217 7976 4243 7937 4231 7865
TIME...MOT...LOC 2314Z 233DEG 36KT 4212 7971 4194 7899 

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

Hitchcock

431 
WWUS51 KBUF 072346
SVSBUF

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

NYC009-013-072355-
/O.EXP.KBUF.SV.W.0053.000000T0000Z-210707T2345Z/
Cattaraugus NY-Chautauqua NY-
746 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CATTARAUGUS AND
CHAUTAUQUA COUNTIES HAS EXPIRED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose 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.

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

LAT...LON 4211 7844 4200 7869 4200 7931 4211 7976
      4217 7976 4243 7937 4231 7865
TIME...MOT...LOC 2345Z 248DEG 39KT 4224 7933 4205 7861 

$$

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, 6:49 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
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.