Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 11, NWS Buffalo, NY

May 15, 2020Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 15, 2020, 3:35 PM EDT for Ontario County, New York. It was in force for 40 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: May 15, 2020, 3:35 PM EDT (19:35 UTC)
Expired: May 15, 2020, 4:15 PM EDT
In force: 40 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Ontario County, NY

The radar

The Binghamton radar (KBGM), 118 km from the middle of the area, began a volume at 19:35 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
May 15, 3:36 PM EDT	TSTM WND DMG	9 Wsw Geneva, NY	TREES DOWN.
May 15, 3:45 PM EDT	TSTM WND DMG	5 Wsw Geneva, NY	TREES AND POWER LINES DOWN.

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, 7.6 hours before the alert went out and 128 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

544 
WUUS51 KBUF 151935
SVRBUF
NYC069-152015-
/O.NEW.KBUF.SV.W.0011.200515T1935Z-200515T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
335 PM EDT Fri May 15 2020

The National Weather Service in Buffalo has issued a

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

* Until 415 PM EDT..

* At 335 PM EDT, a severe thunderstorm was located near Rushville, or
  7 miles southeast of Canandaigua, moving east at 45 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Geneva, Canandaigua, Rushville, Gorham, Seneca Castle, Seneca Lake
  State Park, Cheshire, Cottage City and Hall.

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 4290 7737 4295 7697 4287 7696 4287 7698
      4286 7698 4284 7697 4277 7697 4276 7715
      4276 7731 4275 7732 4275 7733
TIME...MOT...LOC 1935Z 261DEG 40KT 4284 7715 

HAIL...0.88IN
WIND...60MPH
 
$$

Hitchcock

2 follow-up statements

825 
WWUS51 KBUF 151953
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
353 PM EDT Fri May 15 2020

NYC069-152015-
/O.CON.KBUF.SV.W.0011.000000T0000Z-200515T2015Z/
Ontario NY-
353 PM EDT Fri May 15 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR EAST CENTRAL ONTARIO COUNTY...

At 352 PM EDT, a severe thunderstorm was located near Geneva, moving
east at 45 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Geneva.

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 4290 7737 4295 7697 4287 7696 4287 7698
      4286 7698 4284 7697 4277 7697 4276 7715
      4276 7731 4275 7732 4275 7733
TIME...MOT...LOC 1952Z 260DEG 39KT 4286 7691 

HAIL...0.88IN
WIND...60MPH
 
$$

Hitchcock

381 
WWUS51 KBUF 152010
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
410 PM EDT Fri May 15 2020

NYC069-152020-
/O.EXP.KBUF.SV.W.0011.000000T0000Z-200515T2015Z/
Ontario NY-
410 PM EDT Fri May 15 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ONTARIO COUNTY
WILL EXPIRE AT 415 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4290 7737 4295 7697 4287 7696 4287 7698
      4286 7698 4284 7697 4277 7697 4276 7715
      4276 7731 4275 7732 4275 7733
TIME...MOT...LOC 2010Z 261DEG 40KT 4289 7669 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 2:05 PM EDT	Special Weather Statement	BUF	Chautauqua, Livingston, Wyoming	70 min
May 15, 2:26 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Wyoming	49 min
May 15, 3:02 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wyoming	58 min
May 15, 3:17 PM EDT	Special Weather Statement	BUF	Oswego	58 min
May 15, 3:38 PM EDT	Special Weather Statement	BUF	Allegany	37 min
May 15, 3:53 PM EDT	Special Weather Statement	BUF	Lewis	37 min
May 15, 4:38 PM EDT	Special Weather Statement	BUF	Cattaraugus	37 min
May 15, 5:28 PM EDT	Areal Flood Warning	BUF	Chautauqua	3 hr

Nearby

Severe Thunderstorm Warnings in New York, 2020 Every severe thunderstorm warning in 2020

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.