Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 71, NWS Buffalo, NY

July 29, 2020Livingston County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 29, 2020, 3:27 PM EDT for Livingston County, Wyoming County, New York. It was in force for 48 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: Jul 29, 2020, 3:27 PM EDT (19:27 UTC)
Expired: Jul 29, 2020, 4:15 PM EDT
In force: 48 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Livingston County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 72 km from the middle of the area, began a volume at 19:27 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 29, 3:52 PM EDT	TSTM WND DMG	Conesus, NY	TREES AND POWERLINES DOWN
Jul 29, 3:55 PM EDT	TSTM WND DMG	Livonia, NY	TREES AND POWERLINES 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, 7.5 hours before the alert went out and 69 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: 95 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 995 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

573 
WUUS51 KBUF 291927
SVRBUF
NYC051-121-292015-
/O.NEW.KBUF.SV.W.0071.200729T1927Z-200729T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
327 PM EDT Wed Jul 29 2020

The National Weather Service in Buffalo has issued a

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

* Until 415 PM EDT..

* At 326 PM EDT, a severe thunderstorm was located over Warsaw, or 12
  miles northwest of Letchworth State Park, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Geneseo, Letchworth State Park, Perry, Warsaw, Avon, Mount Morris,
  Conesus, Lima, Hemlock and Varysburg.

 This includes Interstate 390 between exits 6 and 10.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4285 7831 4287 7813 4286 7796 4289 7795
      4293 7757 4286 7755 4285 7759 4276 7759
      4276 7761 4269 7760 4256 7832
TIME...MOT...LOC 1926Z 268DEG 30KT 4275 7818 

HAIL...<.75IN
WIND...60MPH
 
$$

Fries

3 follow-up statements

974 
WWUS51 KBUF 291946
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
346 PM EDT Wed Jul 29 2020

NYC051-121-292015-
/O.CON.KBUF.SV.W.0071.000000T0000Z-200729T2015Z/
Wyoming NY-Livingston NY-
346 PM EDT Wed Jul 29 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR EAST CENTRAL WYOMING AND CENTRAL LIVINGSTON COUNTIES...

At 346 PM EDT, a severe thunderstorm was located near Mount Morris,
or near Geneseo, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Geneseo, Letchworth State Park, Perry, Avon, Mount Morris, Conesus,
Lima, Hemlock, York and Groveland.

 This includes Interstate 390 between exits 6 and 10.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Buffalo.

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

&&

LAT...LON 4286 7796 4289 7795 4293 7757 4286 7755
      4285 7759 4276 7759 4276 7761 4269 7760
      4261 7803
TIME...MOT...LOC 1946Z 264DEG 34KT 4277 7790 

HAIL...<.75IN
WIND...60MPH
 
$$

Fries

748 
WWUS51 KBUF 292000
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
400 PM EDT Wed Jul 29 2020

NYC121-292010-
/O.CAN.KBUF.SV.W.0071.000000T0000Z-200729T2015Z/
Wyoming NY-
400 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WYOMING COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4293 7757 4286 7755 4285 7759 4276 7759
      4276 7761 4269 7760 4266 7774 4290 7784
TIME...MOT...LOC 2000Z 268DEG 30KT 4277 7774 

$$

NYC051-292015-
/O.CON.KBUF.SV.W.0071.000000T0000Z-200729T2015Z/
Livingston NY-
400 PM EDT Wed Jul 29 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN LIVINGSTON COUNTY...

At 400 PM EDT, a severe thunderstorm was located near Geneseo, moving
east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Geneseo, Avon, Conesus, Lima, Hemlock, Livonia, South Lima and
Lakeville.

 This includes Interstate 390 between exits 8 and 10.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Buffalo.

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

&&

LAT...LON 4293 7757 4286 7755 4285 7759 4276 7759
      4276 7761 4269 7760 4266 7774 4290 7784
TIME...MOT...LOC 2000Z 268DEG 30KT 4277 7774 

HAIL...<.75IN
WIND...60MPH
 
$$

Fries

515 
WWUS51 KBUF 292012
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
412 PM EDT Wed Jul 29 2020

NYC051-292022-
/O.EXP.KBUF.SV.W.0071.000000T0000Z-200729T2015Z/
Livingston NY-
412 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON 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 4293 7757 4286 7755 4285 7759 4276 7759
      4276 7761 4269 7760 4266 7774 4290 7784
TIME...MOT...LOC 2012Z 268DEG 30KT 4277 7762 

$$

Fries

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 4:20 AM EDT	Small Craft Advisory	BUF		16 hr
Jul 29, 10:06 AM EDT	Special Weather Statement	BUF	Erie	54 min
Jul 29, 10:51 AM EDT	Special Weather Statement	BUF	Genesee	54 min
Jul 29, 10:55 AM EDT	Special Marine Warning	BUF		23 min
Jul 29, 11:35 AM EDT	Special Weather Statement	BUF	Livingston	55 min
Jul 29, 11:51 AM EDT	Special Weather Statement	BUF	Wyoming	54 min
Jul 29, 12:21 PM EDT	Special Weather Statement	BUF	Wyoming	39 min
Jul 29, 12:26 PM EDT	Special Weather Statement	BUF	Ontario	34 min
Jul 29, 1:09 PM EDT	Special Weather Statement	BUF	Livingston	36 min
Jul 29, 1:19 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston, Ontario	41 min
Jul 29, 1:28 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	62 min
Jul 29, 1:48 PM EDT	Special Marine Warning	BUF		42 min
Jul 29, 2:10 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	65 min
Jul 29, 2:13 PM EDT	Special Weather Statement	BUF	Erie	32 min
Jul 29, 2:25 PM EDT	Special Marine Warning	BUF		50 min
Jul 29, 2:49 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Livingston, Wyoming	56 min
Jul 29, 2:53 PM EDT	Special Weather Statement	BUF	Erie, Wyoming	52 min
Jul 29, 3:41 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	64 min
Jul 29, 3:45 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston, Ontario	45 min
Jul 29, 4:15 PM EDT	Special Weather Statement	BUF	Monroe	45 min
Jul 29, 4:20 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	40 min
Jul 29, 4:40 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	38 min
Jul 29, 4:56 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	64 min
Jul 29, 5:35 PM EDT	Special Weather Statement	BUF	Genesee	25 min
Jul 29, 5:42 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Orleans	48 min
Jul 29, 6:34 PM EDT	Special Weather Statement	BUF	Livingston	26 min
Jul 29, 6:37 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario	51 min
Jul 29, 6:41 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Orleans	34 min
Jul 29, 6:50 PM EDT	Tornado Warning	BUF	Livingston, Monroe, Ontario	28 min

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.