Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Burlington, VT

October 16, 2021Clinton County, New York; Franklin County, Grand Isle County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Oct 16, 2021, 2:21 PM EDT for Clinton County, New York; Franklin County, Grand Isle County, Vermont. It was in force for 39 min. 4 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: Oct 16, 2021, 2:21 PM EDT (18:21 UTC)
Expired: Oct 16, 2021, 3:00 PM EDT
In force: 39 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, NY, Franklin County, VT, Grand Isle County, VT

The radar

The Burlington radar (KCXX), 40 km from the middle of the area, began a volume at 18:21 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
Oct 16, 2:24 PM EDT	TSTM WND DMG	1 Ne Cadyville, NY	TREES AND POWERLINES DOWN ON BITTERSWEET LANE.
Oct 16, 2:27 PM EDT	TSTM WND DMG	1 Ese West Plattsburgh, NY	TREES DOWN ON NY RTE 3.
Oct 16, 2:27 PM EDT	TSTM WND DMG	2 Nnw West Plattsburgh, NY	TREES DOWN ON PORTER RD
Oct 16, 2:32 PM EDT	TSTM WND DMG	1 W West Chazy, NY	TREES DOWN ON W CHURCH ST

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
Oct 16, 12:35 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 6.4 hours before the alert went out and 241 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: 50 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

793 
WUUS51 KBTV 161821
SVRBTV
NYC019-VTC011-013-161915-
/O.NEW.KBTV.SV.W.0047.211016T1821Z-211016T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
221 PM EDT Sat Oct 16 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Northeastern Clinton County in northern New York...
  Northern Grand Isle County in northwestern Vermont...
  Northwestern Franklin County in northwestern Vermont...

* Until 315 PM EDT.

* At 221 PM EDT, a severe thunderstorm was located over Jericho,
  moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and powerlines.

* Locations impacted include...
  Plattsburgh, Beekmantown, Chazy, Alburgh Village, South Alburgh,
  Alburgh, Alburgh Dunes State Park, North Hero, Isle La Motte,
  Jericho, Dannemora, Rouses Point, Champlain, St. Albans Town,
  Swanton, Grand Isle, Wagner Point, Young Island, North Hero State
  Park and Scott Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Champlain, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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

&&

LAT...LON 4483 7312 4460 7369 4473 7374 4501 7341
      4501 7319
TIME...MOT...LOC 1821Z 226DEG 33KT 4474 7364 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Haynes

3 follow-up statements

666 
WWUS51 KBTV 161835
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
235 PM EDT Sat Oct 16 2021

NYC019-VTC011-013-161915-
/O.CON.KBTV.SV.W.0047.000000T0000Z-211016T1915Z/
Clinton NY-Grand Isle VT-Franklin VT-
235 PM EDT Sat Oct 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHEASTERN CLINTON...NORTHERN GRAND ISLE AND NORTHWESTERN
FRANKLIN COUNTIES...

At 235 PM EDT, a severe thunderstorm was located over West Chazy,
moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Plattsburgh, Beekmantown, Chazy, Alburgh Village, South Alburgh,
Alburgh, Alburgh Dunes State Park, North Hero, Isle La Motte, Rouses
Point, Champlain, St. Albans Town, Swanton, Grand Isle, Wagner Point,
North Hero State Park, Scott Point, Hazen Point, Ransoms Bay and
Kings Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Champlain, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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

&&

LAT...LON 4483 7312 4467 7352 4482 7358 4501 7341
      4501 7319
TIME...MOT...LOC 1835Z 226DEG 33KT 4483 7351 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Haynes

141 
WWUS51 KBTV 161848
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
248 PM EDT Sat Oct 16 2021

NYC019-VTC011-013-161915-
/O.CON.KBTV.SV.W.0047.000000T0000Z-211016T1915Z/
Clinton NY-Grand Isle VT-Franklin VT-
248 PM EDT Sat Oct 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHEASTERN CLINTON...NORTHERN GRAND ISLE AND NORTHWESTERN
FRANKLIN COUNTIES...

At 248 PM EDT, a severe thunderstorm was located over Chazy Landing,
moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Alburgh Village, Isle La Motte, South Alburgh, Rouses Point, Alburgh,
Alburgh Dunes State Park, North Hero, St. Albans Town, Champlain,
Swanton, Grand Isle, Reed Point, Wagner Point, North Hero State Park,
Alburg Tongue, Butler Island, Hazen Point, Ransoms Bay, Kings Bay and
Hen Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Champlain, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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

&&

LAT...LON 4473 7337 4483 7335 4497 7344 4501 7341
      4501 7319 4483 7312
TIME...MOT...LOC 1848Z 226DEG 33KT 4491 7339 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Haynes

499 
WWUS51 KBTV 161900
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
300 PM EDT Sat Oct 16 2021

NYC019-VTC011-013-161909-
/O.CAN.KBTV.SV.W.0047.000000T0000Z-211016T1915Z/
Clinton NY-Grand Isle VT-Franklin VT-
300 PM EDT Sat Oct 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLINTON...
NORTHERN GRAND ISLE AND NORTHWESTERN FRANKLIN COUNTIES IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
northern New York...and northwestern Vermont.

Remember, a Severe Thunderstorm Warning still remains in effect for
Franklin County, Vermont

LAT...LON 4473 7337 4483 7335 4497 7344 4501 7341
      4501 7319 4483 7312
TIME...MOT...LOC 1858Z 226DEG 33KT 4497 7331 

$$

Haynes

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 16, 9:32 AM EDT	Special Weather Statement	BTV	Franklin	28 min
Oct 16, 12:25 PM EDT	Special Weather Statement	BTV	Franklin	35 min
Oct 16, 12:58 PM EDT	Special Weather Statement	BTV	Franklin	47 min
Oct 16, 1:32 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex, Franklin	43 min
Oct 16, 2:13 PM EDT	Special Weather Statement	BTV	Clinton	32 min
Oct 16, 2:15 PM EDT	Special Weather Statement	BTV	Essex	45 min
Oct 16, 2:40 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex	65 min
Oct 16, 2:55 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Franklin, Grand Isle, Lamoille, Orleans	65 min
Oct 16, 3:08 PM EDT	Special Weather Statement	BTV	Rutland	52 min
Oct 16, 3:43 PM EDT	Special Weather Statement	BTV	Caledonia, Orange, Washington	62 min
Oct 16, 3:55 PM EDT	Special Weather Statement	BTV	Orleans	50 min
Oct 16, 4:47 PM EDT	Special Weather Statement	BTV	Caledonia, Essex, Orange, Windsor	58 min
Oct 16, 5:24 PM EDT	Special Weather Statement	BTV	Windsor	51 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2021 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.