Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 78, NWS Buffalo, NY

July 20, 2021Niagara County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 3:23 PM EDT for Niagara County, New York. It was in force for 67 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 20, 2021, 3:23 PM EDT (19:23 UTC)
Expired: Jul 20, 2021, 4:30 PM EDT
In force: 67 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Niagara County, NY

The radar

The Buffalo radar (KBUF), 35 km from the middle of the area, began a volume at 19:26 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 20, 4:06 PM EDT	HAIL 1	1 Wnw Cambria Center, NY
Jul 20, 4:34 PM EDT	HAIL 1.5	1 S Lockport, NY	REPORT FROM MPING: PING PONG BALL (1.50 IN.).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.4 hours before the alert went out and 38 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: 574 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 893 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

428 
WUUS51 KBUF 201923
SVRBUF
NYC063-202030-
/O.NEW.KBUF.SV.W.0078.210720T1923Z-210720T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
323 PM EDT Tue Jul 20 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Western Niagara County in western New York...

* Until 430 PM EDT..

* At 322 PM EDT, a severe thunderstorm was located over Fort Niagara
  State Park, or 12 miles north of Niagara Falls, moving east at 10
  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...
  Lockport, Newfane, Pendleton, Lewiston, Youngstown, Fort Niagara
  State Park, Sanborn, Wilson, Cambria Center and Olcott.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4334 7892 4337 7868 4309 7870 4308 7872
      4314 7904 4315 7904 4317 7905 4325 7906
      4326 7907 4330 7909
TIME...MOT...LOC 1922Z 273DEG 7KT 4327 7910 

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

Reynolds

2 follow-up statements

065 
WWUS51 KBUF 201959
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
359 PM EDT Tue Jul 20 2021

NYC063-202030-
/O.CON.KBUF.SV.W.0078.000000T0000Z-210720T2030Z/
Niagara NY-
359 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR CENTRAL NIAGARA COUNTY...

At 359 PM EDT, a severe thunderstorm was located over Fort Niagara
State Park, or 12 miles north of Niagara Falls, moving east at 10
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...
Lockport, Newfane, Pendleton, Sanborn, Wilson, Cambria Center,
Olcott, Pendleton Center, Ransomville and Model City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4333 7891 4337 7868 4309 7870 4308 7872
      4309 7873 4308 7873 4314 7902 4329 7905
TIME...MOT...LOC 1959Z 273DEG 7KT 4327 7900 

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

Reynolds

389 
WWUS51 KBUF 202004
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
404 PM EDT Tue Jul 20 2021

NYC063-202030-
/O.CON.KBUF.SV.W.0078.000000T0000Z-210720T2030Z/
Niagara NY-
404 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR CENTRAL NIAGARA COUNTY...

At 404 PM EDT, a severe thunderstorm was located near Fort Niagara
State Park, or 12 miles north of Niagara Falls, moving east at 10
mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Lockport, Newfane, Pendleton, Sanborn, Wilson, Cambria Center,
Olcott, Pendleton Center, Ransomville and Model City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4333 7891 4337 7868 4309 7870 4308 7872
      4309 7873 4308 7873 4314 7902 4329 7905
TIME...MOT...LOC 2004Z 273DEG 7KT 4327 7899 

HAIL...1.50IN
WIND...60MPH
 
$$

Reynolds

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:13 PM EDT	Special Marine Warning	BUF		62 min
Jul 20, 2:57 PM EDT	Special Weather Statement	BUF	Niagara	48 min
Jul 20, 3:14 PM EDT	Special Marine Warning	BUF		61 min
Jul 20, 3:39 PM EDT	Special Marine Warning	BUF		81 min
Jul 20, 3:48 PM EDT	Special Marine Warning	BUF		87 min
Jul 20, 4:08 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	67 min
Jul 20, 4:23 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	67 min
Jul 20, 4:42 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	48 min
Jul 20, 4:46 PM EDT	Special Marine Warning	BUF		59 min
Jul 20, 4:49 PM EDT	Flash Flood Warning	BUF	Niagara	6 hr
Jul 20, 4:55 PM EDT	Special Marine Warning	BUF		48 min
Jul 20, 4:58 PM EDT	Special Marine Warning	BUF		92 min
Jul 20, 5:00 PM EDT	Special Weather Statement	BUF	Genesee	30 min
Jul 20, 5:10 PM EDT	Special Marine Warning	BUF		2 hr
Jul 20, 5:13 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	62 min
Jul 20, 5:28 PM EDT	Special Weather Statement	BUF	Oswego	47 min
Jul 20, 5:30 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	60 min
Jul 20, 5:43 PM EDT	Special Marine Warning	BUF		92 min
Jul 20, 5:43 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	62 min
Jul 20, 5:56 PM EDT	Special Weather Statement	BUF	Genesee, Monroe, Ontario, Orleans	34 min
Jul 20, 6:07 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Jefferson, Lewis, Oswego, Wayne	38 min
Jul 20, 6:21 PM EDT	Flash Flood Warning	BUF	Erie, Niagara	4 hr
Jul 20, 6:26 PM EDT	Special Marine Warning	BUF		34 min
Jul 20, 6:30 PM EDT	Special Weather Statement	BUF	Erie, Genesee	30 min
Jul 20, 6:37 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara	46 min
Jul 20, 6:46 PM EDT	Special Weather Statement	BUF	Lewis	29 min
Jul 20, 6:52 PM EDT	Special Marine Warning	BUF		67 min
Jul 20, 7:24 PM EDT	Special Weather Statement	BUF	Erie, Genesee, Livingston, Ontario, Wyoming	36 min
Jul 20, 7:38 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	31 min
Jul 20, 7:58 PM EDT	Special Weather Statement	BUF	Livingston, Wyoming	92 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.