Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 85, NWS Buffalo, NY

July 20, 20215 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 6:07 PM EDT for 5 counties in New York. It was in force for 38 min. 5 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, 6:07 PM EDT (22:07 UTC)
Expired: Jul 20, 2021, 6:45 PM EDT
In force: 38 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cayuga County, NY, Jefferson County, NY, Lewis County, NY, Oswego County, NY, Wayne County, NY

The radar

The Ft Drum radar (KTYX), 42 km from the middle of the area, began a volume at 22:08 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, 6:08 PM EDT	TSTM WND DMG	New Bremen, NY	TREES AND WIRES DOWN IN NEW BREMEN.
Jul 20, 6:10 PM EDT	TSTM WND DMG	4 Sw Williamstown, NY	REPORTS OF WIDESPREAD DAMAGE INCLUDING DOWNED TREES AND POWERLINES IN THE TOWN OF AMBOY.
Jul 20, 6:31 PM EDT	TSTM WND DMG	Brantingham, NY	TREES AND WIRES DOWN IN BRANTINGHAM.
Jul 20, 6:42 PM EDT	TSTM WND DMG	4 Nw Boonville, NY	TREES AND WIRES DOWN.
Jul 20, 6:42 PM EDT	TSTM WND DMG	Lyonsdale, NY	TREES AND WIRES DOWN IN LYONSDALE.

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

Albany, NY (KALY), launched 12:00Z, 10.1 hours before the alert went out and 200 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: 85 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

205 
WUUS51 KBUF 202207
SVRBUF
NYC011-045-049-075-117-202245-
/O.NEW.KBUF.SV.W.0085.210720T2207Z-210720T2245Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Wayne County in western New York...
  Southeastern Jefferson County in central New York...
  Lewis County in central New York...
  Cayuga County in central New York...
  Oswego County in central New York...

* Until 645 PM EDT..

* At 606 PM EDT, severe thunderstorms were located along a line
  extending from 8 miles south of Star Lake to 6 miles west of
  Oswego, 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...
  Oswego, Fulton, Sandy Island Beach State Park, Fair Haven Beach
  State Park, Lowville, Pulaski, Adams, Redfield, Selkirk Shores
  State Park and Highmarket.

 This includes Interstate 81 between exits 33 and 41.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 4342 7553 4348 7581 4333 7589 4340 7610
      4328 7632 4326 7650 4327 7676 4335 7684
      4356 7645 4357 7628 4377 7629 4406 7517
      4361 7511
TIME...MOT...LOC 2206Z 274DEG 28KT 4404 7505 4347 7663 

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

Welch

1 follow-up statement

696 
WWUS51 KBUF 202251
SVSBUF

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

NYC011-045-049-075-117-202300-
/O.EXP.KBUF.SV.W.0085.000000T0000Z-210720T2245Z/
Wayne NY-Jefferson NY-Lewis NY-Cayuga NY-Oswego NY-
651 PM EDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WAYNE...
SOUTHEASTERN JEFFERSON...LEWIS...CAYUGA AND OSWEGO COUNTIES HAS
EXPIRED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and western New York.

LAT...LON 4342 7553 4348 7581 4333 7589 4340 7610
      4328 7632 4326 7650 4327 7676 4335 7684
      4356 7645 4357 7628 4377 7629 4406 7517
      4361 7511
TIME...MOT...LOC 2250Z 274DEG 28KT 4401 7460 4345 7618 

$$

EAJ

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, 3:23 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	67 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, 6:21 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.