Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Buffalo, NY

July 6, 20215 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 6, 2021, 11:32 AM EDT for 5 counties in New York. It was in force for 43 min. 1 report 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 6, 2021, 11:32 AM EDT (15:32 UTC)
Expired: Jul 6, 2021, 12:15 PM EDT
In force: 43 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Genesee County, NY, Livingston County, NY, Monroe County, NY, Ontario County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 68 km from the middle of the area, began a volume at 15:31 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 6, 11:40 AM EDT	TSTM WND DMG	2 Nw Stafford, NY	TREE AND SOME POWERLINES DOWN ON HORSESHOE LAKE ROAD.

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, 3.5 hours before the alert went out and 66 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: 997 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

338 
WUUS51 KBUF 061532
SVRBUF
NYC037-051-055-069-073-061615-
/O.NEW.KBUF.SV.W.0047.210706T1532Z-210706T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1132 AM EDT Tue Jul 6 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Livingston County in western New York...
  South central Orleans County in western New York...
  Genesee County in western New York...
  Southern Monroe County in western New York...
  Northwestern Ontario County in western New York...

* Until 1215 PM EDT..

* At 1131 AM EDT, a severe thunderstorm was located near Byron, or
  near Batavia, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Batavia, Canandaigua, Henrietta, Le Roy, Avon, Victor, Honeoye
  Falls, Byron, Bristol and Caledonia.

 This includes the following highways...
 Interstate 390 between exits 9 and 12.
 Interstate 90 between exits 48 and 44.

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 4299 7835 4316 7818 4302 7726 4276 7735
TIME...MOT...LOC 1531Z 283DEG 37KT 4304 7811 

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

Fries

2 follow-up statements

208 
WWUS51 KBUF 061553
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1153 AM EDT Tue Jul 6 2021

NYC073-061602-
/O.CAN.KBUF.SV.W.0047.000000T0000Z-210706T1615Z/
Orleans NY-
1153 AM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ORLEANS 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 4292 7806 4313 7798 4302 7726 4276 7735
TIME...MOT...LOC 1552Z 282DEG 36KT 4299 7784 

$$

NYC037-051-055-069-061615-
/O.CON.KBUF.SV.W.0047.000000T0000Z-210706T1615Z/
Livingston NY-Genesee NY-Monroe NY-Ontario NY-
1153 AM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT
FOR NORTHEASTERN LIVINGSTON...EASTERN GENESEE...SOUTHERN MONROE AND
NORTHWESTERN ONTARIO COUNTIES...

At 1152 AM EDT, a severe thunderstorm was located over Caledonia, or
9 miles southwest of Chili, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Canandaigua, Henrietta, Le Roy, Avon, Victor, Honeoye Falls, Bristol,
Caledonia, Lima and Scottsville.

 This includes the following highways...
 Interstate 390 between exits 9 and 12.
 Interstate 90 between exits 47 and 44.

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 4292 7806 4313 7798 4302 7726 4276 7735
TIME...MOT...LOC 1552Z 282DEG 36KT 4299 7784 

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

Hitchcock

861 
WWUS51 KBUF 061616
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1216 PM EDT Tue Jul 6 2021

NYC037-051-055-069-061625-
/O.EXP.KBUF.SV.W.0047.000000T0000Z-210706T1615Z/
Livingston NY-Genesee NY-Monroe NY-Ontario NY-
1216 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON...
EASTERN GENESEE...SOUTHERN MONROE AND NORTHWESTERN ONTARIO COUNTIES
HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

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

Remember, a separate Severe Thunderstorm Warning still remains in 
effect for Monroe and Wayne counties.

LAT...LON 4292 7806 4313 7798 4302 7726 4276 7735
TIME...MOT...LOC 1615Z 283DEG 37KT 4294 7756 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 9:12 PM EDT	Special Marine Warning	BUF		53 min
Jul 5, 9:25 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	65 min
Jul 6, 12:26 AM EDT	Special Marine Warning	BUF		94 min
Jul 6, 1:53 AM EDT	Special Marine Warning	BUF		52 min
Jul 6, 1:54 AM EDT	Special Weather Statement	BUF	Oswego	66 min
Jul 6, 2:42 AM EDT	Special Weather Statement	BUF	Oswego	48 min
Jul 6, 4:55 AM EDT	Small Craft Advisory	BUF		13 hr
Jul 6, 10:42 AM EDT	Special Weather Statement	BUF	Genesee	48 min
Jul 6, 10:51 AM EDT	Special Weather Statement	BUF	Chautauqua	39 min
Jul 6, 11:24 AM EDT	Special Weather Statement	BUF	Genesee	51 min
Jul 6, 11:55 AM EDT	Special Weather Statement	BUF	Monroe	35 min
Jul 6, 12:00 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	45 min
Jul 6, 12:03 PM EDT	Special Marine Warning	BUF		57 min
Jul 6, 12:21 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Ontario, Wayne	54 min
Jul 6, 12:29 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	32 min
Jul 6, 12:42 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	63 min
Jul 6, 12:48 PM EDT	Special Weather Statement	BUF	Niagara	57 min
Jul 6, 1:03 PM EDT	Special Weather Statement	BUF	Cayuga	27 min
Jul 6, 1:10 PM EDT	Special Weather Statement	BUF	Oswego	50 min
Jul 6, 1:36 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	27 min
Jul 6, 1:48 PM EDT	Special Weather Statement	BUF	Erie	57 min
Jul 6, 2:16 PM EDT	Flash Flood Warning	BUF	Erie	3 hr
Jul 6, 3:52 PM EDT	Special Weather Statement	BUF	Monroe	23 min
Jul 6, 4:26 PM EDT	Special Weather Statement	BUF	Wayne	34 min
Jul 6, 4:52 PM EDT	Special Weather Statement	BUF	Erie	38 min
Jul 6, 6:55 PM EDT	Special Weather Statement	BUF	Erie	35 min
Jul 6, 7:29 PM EDT	Special Weather Statement	BUF	Wyoming	46 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

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.