Alert archive / New York / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 79, NWS Buffalo, NY

August 15, 2019Livingston County, Monroe County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 15, 2019, 4:45 PM EDT for Livingston County, Monroe County, Ontario County, New York. It was in force for 27 min. 3 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 15, 2019, 4:45 PM EDT (20:45 UTC)
Expired: Aug 15, 2019, 5:12 PM EDT
In force: 27 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Livingston County, NY, Monroe County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 93 km from the middle of the area, began a volume at 20:45 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 15, 4:45 PM EDT	HAIL 1	4 E Avon, NY
Aug 15, 4:47 PM EDT	TSTM WND DMG	2 Ne Avon, NY	TREE DOWN ON TRAILER
Aug 15, 4:47 PM EDT	HAIL 1.25	2 Nnw Lima, NY

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, 8.8 hours before the alert went out and 90 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: 1667 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

075 
WUUS51 KBUF 152045
SVRBUF
NYC051-055-069-152145-
/O.NEW.KBUF.SV.W.0079.190815T2045Z-190815T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
445 PM EDT Thu Aug 15 2019

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Livingston County in western New York...
  Southeastern Monroe County in western New York...
  Northwestern Ontario County in western New York...

* Until 545 PM EDT..

* At 445 PM EDT, a severe thunderstorm was located near Avon, or 10
  miles northeast of Geneseo, moving northeast 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...
  Rochester, Greece, Irondequoit, East Rochester, Fairport, Brighton,
  Gates-North Gates, Henrietta, Penfield and Avon.

 This includes the following highways...
 Interstate 390 between exits 9 and 12.
 Interstate 90 near exit 46.

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 4289 7783 4324 7767 4323 7754 4317 7738
      4316 7738 4281 7761
TIME...MOT...LOC 2045Z 206DEG 22KT 4292 7768 

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

Hitchcock

2 follow-up statements

413 
WWUS51 KBUF 152102
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
502 PM EDT Thu Aug 15 2019

NYC051-069-152111-
/O.CAN.KBUF.SV.W.0079.000000T0000Z-190815T2145Z/
Livingston NY-Ontario NY-
502 PM EDT Thu Aug 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON AND
NORTHWESTERN ONTARIO COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4297 7770 4323 7760 4323 7754 4317 7738
      4316 7738 4303 7746 4303 7749 4300 7749
      4294 7752 4294 7762
TIME...MOT...LOC 2101Z 212DEG 23KT 4300 7756 

$$

NYC055-152145-
/O.CON.KBUF.SV.W.0079.000000T0000Z-190815T2145Z/
Monroe NY-
502 PM EDT Thu Aug 15 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN MONROE COUNTY...

At 501 PM EDT, a severe thunderstorm was located near Honeoye Falls,
or 8 miles south of Brighton, moving northeast 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...
Rochester, Irondequoit, East Rochester, Fairport, Brighton,
Henrietta, Penfield, Honeoye Falls, Mendon and Rush.

 This includes the following highways...
 Interstate 390 between exits 11 and 12.
 Interstate 90 near exit 46.

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 4297 7770 4323 7760 4323 7754 4317 7738
      4316 7738 4303 7746 4303 7749 4300 7749
      4294 7752 4294 7762
TIME...MOT...LOC 2101Z 212DEG 23KT 4300 7756 

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

Hitchcock

429 
WWUS51 KBUF 152112
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
512 PM EDT Thu Aug 15 2019

NYC055-152121-
/O.CAN.KBUF.SV.W.0079.000000T0000Z-190815T2145Z/
Monroe NY-
512 PM EDT Thu Aug 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE COUNTY IS
CANCELLED...
                
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 cancelled.  However small hail is
still possible with this thunderstorm.

LAT...LON 4297 7770 4323 7760 4323 7754 4317 7738
      4316 7738 4303 7746 4303 7749 4300 7749
      4294 7752 4294 7762
TIME...MOT...LOC 2106Z 206DEG 22KT 4306 7752 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 2:48 PM EDT	Special Weather Statement	BUF	Cattaraugus	42 min
Aug 15, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Aug 15, 3:39 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Wyoming	51 min
Aug 15, 3:55 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	50 min
Aug 15, 4:21 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	54 min
Aug 15, 4:33 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Aug 15, 4:43 PM EDT	Special Weather Statement	BUF	Monroe	47 min

Nearby

Severe Thunderstorm Warnings in New York, 2019 Every severe thunderstorm warning in 2019

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.