Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS Buffalo, NY

August 29, 2021Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 29, 2021, 3:25 PM EDT for Ontario County, New York. It was in force for 20 min. 2 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 29, 2021, 3:25 PM EDT (19:25 UTC)
Expired: Aug 29, 2021, 3:45 PM EDT
In force: 20 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Ontario County, NY

The radar

The Binghamton radar (KBGM), 116 km from the middle of the area, began a volume at 19:25 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 29, 3:38 PM EDT	TSTM WND DMG	1 Ssw Geneva, NY	TREES AND WIRES DOWN ON WHITE SPRINGS ROAD. TIME ESTIMATED FROM RADAR.
Aug 29, 3:38 PM EDT	TSTM WND DMG	Geneva, NY	TREES AND WIRES DOWN ON THE CORNER OF WILLIAM AND PULTENEY STREETS. TIME ESTIMATED FROM 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 12:00Z, 7.4 hours before the alert went out and 135 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: 580 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

445 
WUUS51 KBUF 291925
SVRBUF
NYC069-291945-
/O.NEW.KBUF.SV.W.0104.210829T1925Z-210829T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
325 PM EDT Sun Aug 29 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Ontario County in western New York...

* Until 345 PM EDT.

* At 324 PM EDT, a severe thunderstorm was located over Phelps, or
  near Geneva, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Geneva, Clifton Springs, Phelps, Seneca Castle, Seneca Lake State
  Park and West Junius.

This includes Interstate 90 near exit 42.
 
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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4283 7718 4303 7714 4301 7713 4301 7696
      4287 7696 4287 7698 4286 7698 4284 7697
      4280 7698
TIME...MOT...LOC 1924Z 276DEG 25KT 4292 7706 

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

$$

Mitchell

1 follow-up statement

335 
WWUS51 KBUF 291946
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
346 PM EDT Sun Aug 29 2021

NYC069-291955-
/O.EXP.KBUF.SV.W.0104.000000T0000Z-210829T1945Z/
Ontario NY-
346 PM EDT Sun Aug 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ONTARIO COUNTY
HAS EXPIRED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been allowed to expire.

LAT...LON 4283 7718 4303 7714 4301 7713 4301 7696
      4287 7696 4287 7698 4286 7698 4284 7697
      4280 7698
TIME...MOT...LOC 1945Z 276DEG 25KT 4291 7688 

$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 9:06 PM EDT	Special Weather Statement	BUF	Livingston	54 min
Aug 29, 12:04 AM EDT	Special Weather Statement	BUF	Jefferson	56 min
Aug 29, 1:02 AM EDT	Special Weather Statement	BUF	Jefferson, Lewis	58 min
Aug 29, 2:04 AM EDT	Special Weather Statement	BUF	Jefferson	3 hr
Aug 29, 12:03 PM EDT	Special Marine Warning	BUF		57 min
Aug 29, 12:07 PM EDT	Special Weather Statement	BUF	Niagara	53 min
Aug 29, 12:24 PM EDT	Special Weather Statement	BUF	Chautauqua	66 min
Aug 29, 12:47 PM EDT	Flash Flood Warning	BUF	Niagara	3 hr
Aug 29, 1:55 PM EDT	Special Weather Statement	BUF	Seneca	35 min
Aug 29, 2:04 PM EDT	Special Weather Statement	BUF	Ontario	41 min
Aug 29, 2:11 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	64 min
Aug 29, 2:30 PM EDT	Special Weather Statement	BUF	Ontario, Wayne	60 min
Aug 29, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	10 min
Aug 29, 3:57 PM EDT	Special Marine Warning	BUF		62 min
Aug 29, 5:29 PM EDT	Special Weather Statement	BUF	Ontario	31 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.