Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Burlington, VT

September 8, 20214 counties in Vermont; Essex County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Sep 8, 2021, 5:49 PM EDT for 4 counties in Vermont; Essex County, New York. It was in force for 41 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: Sep 8, 2021, 5:49 PM EDT (21:49 UTC)
Expired: Sep 8, 2021, 6:30 PM EDT
In force: 41 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Essex County, NY, Chittenden County, VT, Franklin County, VT, Lamoille County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 11 km from the middle of the area, began a volume at 21:53 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
Sep 8, 5:50 PM EDT	TSTM WND DMG	1 S Shelburne Point, VT	TREES AND LINES DOWN ON HARBOR ROAD NEAR SHELBURNE POINT
Sep 8, 5:53 PM EDT	TSTM WND DMG	1 Ese Hinesburg, VT	TREES AND LINES DOWN ON ROUTE 116
Sep 8, 6:00 PM EDT	HAIL 0.25	1 Se South Burlington, VT	REPORTS OF HAIL ESTIMATED JUST OVER PEA SIZE AT OVERLOOK PARK ON SPEAR STREET.

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

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.8 hours before the alert went out and 206 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1380 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

045 
WUUS51 KBTV 082149
SVRBTV
NYC031-VTC007-011-015-023-082230-
/O.NEW.KBTV.SV.W.0040.210908T2149Z-210908T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
549 PM EDT Wed Sep 8 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Northeastern Essex County in northern New York...
  Southwestern Lamoille County in northwestern Vermont...
  Chittenden County in northwestern Vermont...
  Northwestern Washington County in central Vermont...
  South central Franklin County in northwestern Vermont...

* Until 630 PM EDT.

* At 548 PM EDT, a severe thunderstorm was located over Red Rock
  Point, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and powerlines.

* Locations impacted include...
  Essex Junction, South Burlington, Burlington International Airport,
  Burlington, Morrisville, Charlotte, Cambridge, Winooski, Cambridge
  Village, Stowe, Westford, Jeffersonville Village, Colchester, Essex
  Junction Village, Fairfax, Williston, Bolton, Richmond, Mt. Philo
  State Park and Underhill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters on Lake Champlain should seek safe harbor now! Strong winds
will cause higher waves and sudden wind shifts may overturn boats.

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 
minor nuisance flooding in the city of Burlington. Do not drive your 
vehicle through flooded roadways.

&&

LAT...LON 4427 7321 4444 7341 4478 7293 4453 7251
TIME...MOT...LOC 2148Z 232DEG 36KT 4444 7321 

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

$$

Hammond

2 follow-up statements

410 
WWUS51 KBTV 082210
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
610 PM EDT Wed Sep 8 2021

NYC031-082219-
/O.CAN.KBTV.SV.W.0040.000000T0000Z-210908T2230Z/
Essex NY-
610 PM EDT Wed Sep 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ESSEX COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4435 7300 4456 7317 4478 7293 4453 7251
TIME...MOT...LOC 2209Z 232DEG 36KT 4457 7297 

$$

VTC007-011-015-023-082230-
/O.CON.KBTV.SV.W.0040.000000T0000Z-210908T2230Z/
Lamoille VT-Chittenden VT-Washington VT-Franklin VT-
610 PM EDT Wed Sep 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SOUTHWESTERN LAMOILLE...NORTHEASTERN CHITTENDEN...NORTHWESTERN
WASHINGTON AND SOUTH CENTRAL FRANKLIN COUNTIES...

At 609 PM EDT, a severe thunderstorm was located over North
Underhill, moving northeast at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Essex Junction, Morrisville, Cambridge, Cambridge Village, Stowe,
Westford, Jeffersonville Village, Fairfax, Bolton, Richmond,
Underhill, Jericho, Morrisville Village, Essex, Jericho Village,
Underhill State Park, Morristown, Fletcher, Essex Junction Village
and Johnson Village.

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 4435 7300 4456 7317 4478 7293 4453 7251
TIME...MOT...LOC 2209Z 232DEG 36KT 4457 7297 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hammond

983 
WWUS51 KBTV 082221
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
621 PM EDT Wed Sep 8 2021

VTC007-011-015-023-082231-
/O.EXP.KBTV.SV.W.0040.000000T0000Z-210908T2230Z/
Lamoille VT-Chittenden VT-Washington VT-Franklin VT-
621 PM EDT Wed Sep 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAMOILLE...
NORTHEASTERN CHITTENDEN...NORTHWESTERN WASHINGTON AND SOUTH CENTRAL
FRANKLIN COUNTIES WILL EXPIRE AT 630 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 4435 7300 4456 7317 4478 7293 4453 7251
TIME...MOT...LOC 2221Z 232DEG 36KT 4464 7284 

$$

Hammond

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 5:31 PM EDT	Special Weather Statement	BTV	Chittenden	29 min
Sep 8, 6:03 PM EDT	Areal Flood Warning	BTV	Chittenden	3 hr
Sep 8, 6:25 PM EDT	Special Weather Statement	BTV	Lamoille, Orleans	35 min
Sep 8, 6:46 PM EDT	Special Weather Statement	BTV	Addison	29 min
Sep 8, 7:10 PM EDT	Special Weather Statement	BTV	Rutland	35 min
Sep 8, 7:38 PM EDT	Special Weather Statement	BTV	Windsor	37 min
Sep 8, 7:51 PM EDT	Severe Thunderstorm Warning	BTV	Rutland, Windsor	39 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.