Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Burlington, VT

June 21, 2021Franklin County, St. Lawrence County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jun 21, 2021, 1:41 PM EDT for Franklin County, St. Lawrence County, New York. It was in force for 49 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: Jun 21, 2021, 1:41 PM EDT (17:41 UTC)
Expired: Jun 21, 2021, 2:30 PM EDT
In force: 49 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, NY, St. Lawrence County, NY

The radar

The Burlington radar (KCXX), 139 km from the middle of the area, began a volume at 17:41 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
Jun 21, 1:45 PM EDT	HAIL 0.5	Fort Covington, NY
Jun 21, 1:50 PM EDT	TSTM WND DMG	1 W Fort Covington, NY	SEVERAL TREES REPORTED DOWN ON HOPKINS POINT ROAD IN CONVINGTON BY TOWN GARAGE. SEVERAL OTHER STREETS HAD TREES DOWN AS WELL.
Jun 21, 1:50 PM EDT	TSTM WND DMG	Fort Covington, NY	MEDIA RELAYED REPORTS OF A SEVERELY DAMAGED BARN BUILDING, SEVERAL TREES UPROOTED AND SNAPPED AND A DAMAGED VEHICLE IN FORT COVINGTON.

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
Jun 21, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.7 hours before the alert went out and 264 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: 524 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 990 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

892 
WUUS51 KBTV 211741
SVRBTV
NYC033-089-211830-
/O.NEW.KBTV.SV.W.0008.210621T1741Z-210621T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
141 PM EDT Mon Jun 21 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Northwestern Franklin County in northern New York...
  Northeastern St. Lawrence County in northern New York...

* Until 230 PM EDT.

* At 141 PM EDT, a severe thunderstorm was located over Fort
  Covington Center, moving northeast at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind 
           damage to trees and powerlines.

* Locations impacted include...
  Massena, Moira, Fort Covington, Bombay, St. Regis, Massena
  International Airport - Richards Field, Helena, Brasher Falls,
  Brushton, Constable, Eisenhower Lock, Fort Covington Center, South
  Bombay, Brasher Center, Hogansburg, Westville Center, St. Lawrence
  State Park, Ironton, Rooseveltown and North Lawrence.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4499 7474 4501 7467 4499 7434 4499 7404
      4471 7488 4494 7504 4493 7501 4496 7497
      4495 7495 4496 7492 4497 7496 4499 7489
      4497 7493 4497 7488 4500 7489 4501 7483
TIME...MOT...LOC 1741Z 234DEG 31KT 4495 7446 

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

Neiles

2 follow-up statements

867 
WWUS51 KBTV 211802
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
202 PM EDT Mon Jun 21 2021

NYC033-089-211830-
/O.CON.KBTV.SV.W.0008.000000T0000Z-210621T1830Z/
Franklin NY-St. Lawrence NY-
202 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHWESTERN FRANKLIN AND NORTHEASTERN ST. LAWRENCE COUNTIES...

At 202 PM EDT, a severe thunderstorm was located near North Burke,
moving northeast at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and powerlines.

Locations impacted include...
Massena, Moira, Fort Covington, Bombay, St. Regis, Massena
International Airport - Richards Field, Helena, Brasher Falls,
Brushton, Constable, Eisenhower Lock, Fort Covington Center, South
Bombay, Brasher Center, Hogansburg, Westville Center, St. Lawrence
State Park, Ironton, Rooseveltown and North Lawrence.

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
Burlington.

&&

LAT...LON 4499 7474 4501 7467 4499 7434 4499 7404
      4471 7488 4494 7504 4493 7501 4496 7497
      4495 7495 4496 7492 4497 7496 4499 7489
      4497 7493 4497 7488 4500 7489 4501 7483
TIME...MOT...LOC 1802Z 234DEG 31KT 4506 7425 

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

Neiles

505 
WWUS51 KBTV 211827
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
227 PM EDT Mon Jun 21 2021

NYC033-089-211836-
/O.EXP.KBTV.SV.W.0008.000000T0000Z-210621T1830Z/
Franklin NY-St. Lawrence NY-
227 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FRANKLIN AND
NORTHEASTERN ST. LAWRENCE COUNTIES WILL EXPIRE AT 230 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern New York.

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

LAT...LON 4499 7474 4501 7467 4499 7434 4499 7404
      4471 7488 4494 7504 4493 7501 4496 7497
      4495 7495 4496 7492 4497 7496 4499 7489
      4497 7493 4497 7488 4500 7489 4501 7483
TIME...MOT...LOC 1826Z 234DEG 31KT 4518 7401 

$$

Neiles

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 7:59 AM EDT	Special Weather Statement	BTV	St. Lawrence	61 min
Jun 21, 9:12 AM EDT	Special Weather Statement	BTV	Clinton, Franklin	48 min
Jun 21, 10:08 AM EDT	Special Weather Statement	BTV	Clinton	37 min
Jun 21, 1:06 PM EDT	Special Weather Statement	BTV	St. Lawrence	39 min
Jun 21, 1:28 PM EDT	Special Weather Statement	BTV	St. Lawrence	62 min
Jun 21, 2:08 PM EDT	Special Weather Statement	BTV	St. Lawrence	67 min
Jun 21, 2:35 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	55 min
Jun 21, 3:13 PM EDT	Severe Thunderstorm Warning	BTV	Essex	62 min
Jun 21, 3:25 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex, Franklin, St. Lawrence	54 min
Jun 21, 4:40 PM EDT	Severe Thunderstorm Warning	BTV	Essex	65 min
Jun 21, 4:57 PM EDT	Special Weather Statement	BTV	Essex	48 min
Jun 21, 5:12 PM EDT	Severe Thunderstorm Warning	BTV	Essex	63 min
Jun 21, 7:50 PM EDT	Special Weather Statement	BTV	Essex	25 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.