Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 67, NWS Buffalo, NY

July 29, 2020Allegany County, Livingston County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 29, 2020, 1:19 PM EDT for Allegany County, Livingston County, Ontario County, New York. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 29, 2020, 1:19 PM EDT (17:19 UTC)
Expired: Jul 29, 2020, 2:00 PM EDT
In force: 41 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Allegany County, NY, Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 88 km from the middle of the area, began a volume at 17:23 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.3 hours before the alert went out and 85 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.

921 
WUUS51 KBUF 291719
SVRBUF
NYC003-051-069-291800-
/O.NEW.KBUF.SV.W.0067.200729T1719Z-200729T1800Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southern Livingston County in western New York...
  Northeastern Allegany County in western New York...
  Southwestern Ontario County in western New York...

* Until 200 PM EDT..

* At 119 PM EDT, a severe thunderstorm was located over Dansville,
  moving east at 35 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...
  Dansville, Naples, Groveland, Springwater, Nunda, Ossian,
  Canaseraga, Hunt, Dalton and Ossian Center.

 This includes Interstate 390 between exits 4 and 5.
 
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 4252 7806 4253 7804 4254 7804 4260 7798
      4267 7784 4264 7737 4258 7737 4258 7766
      4253 7766 4253 7772 4244 7773
TIME...MOT...LOC 1719Z 278DEG 32KT 4257 7775 

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

Fries

3 follow-up statements

827 
WWUS51 KBUF 291731
SVSBUF

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

NYC003-291741-
/O.CAN.KBUF.SV.W.0067.000000T0000Z-200729T1800Z/
Allegany NY-
131 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ALLEGANY 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 4247 7779 4250 7784 4252 7784 4252 7787
      4253 7789 4265 7770 4264 7737 4258 7737
      4258 7766 4253 7766 4253 7772 4247 7773
TIME...MOT...LOC 1731Z 275DEG 26KT 4257 7769 

$$

NYC051-069-291800-
/O.CON.KBUF.SV.W.0067.000000T0000Z-200729T1800Z/
Livingston NY-Ontario NY-
131 PM EDT Wed Jul 29 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR SOUTHEASTERN LIVINGSTON AND SOUTHWESTERN ONTARIO COUNTIES...

At 131 PM EDT, a severe thunderstorm was located over Dansville,
moving east at 30 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Dansville, Naples, Springwater, Ossian, Canaseraga and Ossian Center.

 This includes Interstate 390 between exits 4 and 5.
 
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 4247 7779 4250 7784 4252 7784 4252 7787
      4253 7789 4265 7770 4264 7737 4258 7737
      4258 7766 4253 7766 4253 7772 4247 7773
TIME...MOT...LOC 1731Z 275DEG 26KT 4257 7769 

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

Fries

183 
WWUS51 KBUF 291750
SVSBUF

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

NYC051-291800-
/O.CAN.KBUF.SV.W.0067.000000T0000Z-200729T1800Z/
Livingston NY-
150 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON 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 4264 7749 4264 7737 4258 7737 4258 7749
TIME...MOT...LOC 1750Z 274DEG 23KT 4259 7740 

$$

NYC069-291800-
/O.CON.KBUF.SV.W.0067.000000T0000Z-200729T1800Z/
Ontario NY-
150 PM EDT Wed Jul 29 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR SOUTHWESTERN ONTARIO COUNTY...

At 150 PM EDT, a severe thunderstorm was located over Naples, or 14
miles east of Dansville, moving east at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Naples.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4264 7749 4264 7737 4258 7737 4258 7749
TIME...MOT...LOC 1750Z 274DEG 23KT 4259 7740 

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

Fries

652 
WWUS51 KBUF 291757
SVSBUF

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

NYC069-291807-
/O.EXP.KBUF.SV.W.0067.000000T0000Z-200729T1800Z/
Ontario NY-
157 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ONTARIO COUNTY
WILL EXPIRE AT 200 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

LAT...LON 4264 7749 4264 7737 4258 7737 4258 7749
TIME...MOT...LOC 1757Z 278DEG 32KT 4258 7732 

$$

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, 1:28 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, 3:27 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Wyoming	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.