Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 79, NWS Buffalo, NY

July 29, 2020Genesee County, Orleans County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 29, 2020, 6:41 PM EDT for Genesee County, Orleans County, New York. It was in force for 34 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, 6:41 PM EDT (22:41 UTC)
Expired: Jul 29, 2020, 7:15 PM EDT
In force: 34 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Genesee County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 51 km from the middle of the area, began a volume at 22:46 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, 6:42 PM EDT	TSTM WND DMG	Oakfield, NY	NUMEROUS TREES DOWN
Jul 29, 6:50 PM EDT	TSTM WND DMG	Elba, NY	MULTIPLE TREES AND LIMBS DAMAGED

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, 10.7 hours before the alert went out and 49 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.

566 
WUUS51 KBUF 292241
SVRBUF
NYC037-073-292315-
/O.NEW.KBUF.SV.W.0079.200729T2241Z-200729T2315Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southeastern Orleans County in western New York...
  Northeastern Genesee County in western New York...

* Until 715 PM EDT..

* At 641 PM EDT, a severe thunderstorm was located near Oakfield, or
  9 miles northwest of Batavia, moving east at 30 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...
  Byron, Oakfield, Elba and Barre Center. 

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 4308 7836 4320 7832 4317 7800 4314 7800
      4313 7798 4300 7804
TIME...MOT...LOC 2241Z 276DEG 27KT 4312 7827 

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

Fries

1 follow-up statement

158 
WWUS51 KBUF 292310
SVSBUF

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

NYC037-073-292320-
/O.EXP.KBUF.SV.W.0079.000000T0000Z-200729T2315Z/
Orleans NY-Genesee NY-
710 PM EDT Wed Jul 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ORLEANS AND
NORTHEASTERN GENESEE COUNTIES WILL EXPIRE AT 715 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
far northeastern Genesee County until 745 PM.

LAT...LON 4308 7836 4320 7832 4317 7800 4314 7800
      4313 7798 4300 7804
TIME...MOT...LOC 2310Z 276DEG 27KT 4310 7798 

$$

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, 3:27 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, 6:50 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.