Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Burlington, VT

July 20, 2021Clinton County, Essex County, Franklin County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 20, 2021, 5:50 PM EDT for Clinton County, Essex County, Franklin County, New York. It was in force for 40 min. 3 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, 5:50 PM EDT (21:50 UTC)
Expired: Jul 20, 2021, 6:30 PM EDT
In force: 40 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, NY, Essex County, NY, Franklin County, NY

The radar

The Burlington radar (KCXX), 65 km from the middle of the area, began a volume at 21:51 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, 6:01 PM EDT	TSTM WND DMG	Bloomingdale, NY	LARGE TREE DOWN ACROSS OREGON PLAINS ROAD.
Jul 20, 6:01 PM EDT	TSTM WND DMG	Vermontville, NY	TREES DOWN.
Jul 20, 6:25 PM EDT	TSTM WND DMG	Ausable Forks, NY	ARCING POWER LINES DOWN.

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, 9.8 hours before the alert went out and 193 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.

956 
WUUS51 KBTV 202150
SVRBTV
NYC019-031-033-202230-
/O.NEW.KBTV.SV.W.0031.210720T2150Z-210720T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
550 PM EDT Tue Jul 20 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Clinton County in northern New York...
  Eastern Franklin County in northern New York...
  Central Essex County in northern New York...

* Until 630 PM EDT.

* At 548 PM EDT, a line of severe thunderstorms over northern New 
  York was located along a line extending from North Burke to Debar 
  Mountain to 8 miles southwest of Axton Landing, moving east at 45 
  mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and powerlines as there have 
           been numerous reports or trees and powerlines down along 
           with power outages. Minor hail damage to vehicles is 
           possible. 

* Locations impacted include...
  Saranac Lake, Adirondack Regional Airport, Lake Placid,
  Plattsburgh, Tupper Lake, Peru, Beekmantown, Schuyler Falls, Chazy,
  Saranac, Mooers, Altona, Wilmington, Keene, Ellenburg Depot,
  Champlain, Bryants Mill, Wawbeek, Burke and Churubusco.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4455 7350 4392 7378 4399 7426 4412 7428
      4410 7450 4461 7430 4499 7426 4501 7340
TIME...MOT...LOC 2148Z 275DEG 40KT 4498 7415 4461 7420 4409 7440 

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

Evenson/LaRocca

1 follow-up statement

776 
WWUS51 KBTV 202217
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
617 PM EDT Tue Jul 20 2021

NYC019-031-033-202230-
/O.CON.KBTV.SV.W.0031.000000T0000Z-210720T2230Z/
Clinton NY-Franklin NY-Essex NY-
617 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR CLINTON...EASTERN FRANKLIN AND CENTRAL ESSEX COUNTIES...

At 616 PM EDT, a line of severe thunderstorms over northern New York 
was located along a line extending from near Cannon Corners to 
Clayburg to near Newcomb, moving east at 45 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and powerlines. There have been 
         numerous reports of downed trees and power outages across 
         northern New York with this line of storms. Minor hail 
         damage to vehicles is possible. 

Locations impacted include...
Saranac Lake, Lake Placid, Plattsburgh, Peru, Beekmantown, Schuyler
Falls, Chazy, Saranac, Mooers, Altona, Wilmington, Keene, Ellenburg
Depot, Champlain, Lyon Mountain, Clayburg, Merrill, Keene Valley,
Churubusco and Au Sable Forks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4455 7350 4392 7378 4399 7426 4412 7428
      4412 7429 4414 7430 4431 7421 4461 7410
      4499 7411 4501 7340
TIME...MOT...LOC 2216Z 274DEG 40KT 4501 7377 4459 7383 4397 7407 

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

Evenson/LaRocca

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 3:53 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	52 min
Jul 20, 4:44 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	61 min
Jul 20, 5:35 PM EDT	Severe Thunderstorm Warning	BTV	Essex	55 min
Jul 20, 6:31 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex	59 min
Jul 20, 7:32 PM EDT	Severe Thunderstorm Warning	BTV	Essex	58 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.