Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Burlington, VT

June 21, 20218 counties in Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jun 21, 2021, 5:17 PM EDT for 8 counties in Vermont. It was in force for 58 min. 1 report 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, 5:17 PM EDT (21:17 UTC)
Expired: Jun 21, 2021, 6:15 PM EDT
In force: 58 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Addison County, VT, Caledonia County, VT, Chittenden County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Washington County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 45 km from the middle of the area, began a volume at 21:17 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, 5:20 PM EDT	HAIL 1.25	Bristol, VT	PUBLIC REPORTED HAIL OF AT LEAST QUARTER SIZE.

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

Gray, ME (KGYX), launched 12:00Z, 9.3 hours before the alert went out and 197 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: 20 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1333 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

983 
WUUS51 KBTV 212117
SVRBTV
VTC001-005-007-015-017-019-023-027-212215-
/O.NEW.KBTV.SV.W.0015.210621T2117Z-210621T2215Z/

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

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Southern Lamoille County in northwestern Vermont...
  Southwestern Caledonia County in northeastern Vermont...
  Northwestern Orange County in central Vermont...
  Southwestern Orleans County in northeastern Vermont...
  Central Addison County in central Vermont...
  Southeastern Chittenden County in northwestern Vermont...
  Northwestern Windsor County in southern Vermont...
  Washington County in central Vermont...

* Until 615 PM EDT.

* At 516 PM EDT, severe thunderstorms were located along a line
  extending from Underhill Center to South Starksboro, moving east at
  40 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...
  Barre, Middlebury, Montpelier, Morrisville, Cornwall, Calais,
  Braintree Hill, Orange, Salisbury, Monkton Ridge, Waterbury
  Village, Websterville, Lincoln, Monkton, Whiting, New Haven,
  Worcester, Middlesex, Granville and Marshfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4467 7228 4399 7235 4386 7325 4453 7306
TIME...MOT...LOC 2116Z 253DEG 35KT 4448 7289 4414 7301 

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

Neiles

2 follow-up statements

634 
WWUS51 KBTV 212159
SVSBTV

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

VTC001-005-007-015-017-019-023-027-212215-
/O.CON.KBTV.SV.W.0015.000000T0000Z-210621T2215Z/
Lamoille VT-Caledonia VT-Orange VT-Orleans VT-Addison VT-
Chittenden VT-Windsor VT-Washington VT-
559 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHEASTERN LAMOILLE...SOUTHWESTERN CALEDONIA...NORTHWESTERN
ORANGE...SOUTH CENTRAL ORLEANS...EASTERN ADDISON...SOUTHEASTERN
CHITTENDEN...NORTHWESTERN WINDSOR AND WASHINGTON COUNTIES...

At 559 PM EDT, severe thunderstorms were located along a line
extending from near Little River State Park to Warren, moving east 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...
Barre, Montpelier, Middlebury, Calais, Braintree Hill, Orange,
Salisbury, Waterbury Village, Websterville, Lincoln, Worcester,
Middlesex, Granville, Marshfield, Cabot Village, Hancock, Corinth
Corners, Washington, Ripton and Woodbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4467 7228 4399 7235 4387 7315 4435 7302
TIME...MOT...LOC 2159Z 250DEG 32KT 4445 7278 4411 7290 

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

Neiles

335 
WWUS51 KBTV 212221
SVSBTV

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

VTC001-005-007-015-017-019-023-027-212230-
/O.EXP.KBTV.SV.W.0015.000000T0000Z-210621T2215Z/
Lamoille VT-Caledonia VT-Orange VT-Orleans VT-Addison VT-
Chittenden VT-Windsor VT-Washington VT-
621 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LAMOILLE...
SOUTHWESTERN CALEDONIA...NORTHWESTERN ORANGE...SOUTH CENTRAL
ORLEANS...EASTERN ADDISON...SOUTHEASTERN CHITTENDEN...NORTHERN
WINDSOR AND WASHINGTON COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central, southern, northeastern and northwestern Vermont.

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

LAT...LON 4467 7228 4399 7235 4387 7315 4435 7302
TIME...MOT...LOC 2220Z 253DEG 35KT 4451 7251 4417 7263 

$$

Neiles

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 10:08 AM EDT	Special Weather Statement	BTV	Grand Isle	37 min
Jun 21, 3:07 PM EDT	Special Weather Statement	BTV	Franklin	23 min
Jun 21, 3:13 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Washington	62 min
Jun 21, 3:47 PM EDT	Special Weather Statement	BTV	Lamoille	58 min
Jun 21, 4:15 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Lamoille, Orange, Washington	60 min
Jun 21, 4:40 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland, Washington, Windsor	65 min
Jun 21, 4:54 PM EDT	Special Weather Statement	BTV	Chittenden, Franklin, Lamoille	51 min
Jun 21, 5:12 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Orange, Rutland, Windsor	63 min
Jun 21, 5:39 PM EDT	Special Weather Statement	BTV	Essex	36 min
Jun 21, 6:01 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Essex	59 min
Jun 21, 6:18 PM EDT	Severe Thunderstorm Warning	BTV	Rutland, Windsor	57 min
Jun 21, 6:47 PM EDT	Severe Thunderstorm Warning	BTV	Orange, Windsor	28 min
Jun 21, 7:04 PM EDT	Special Weather Statement	BTV	Caledonia	26 min
Jun 21, 7:29 PM EDT	Special Weather Statement	BTV	Caledonia	16 min
Jun 21, 7:50 PM EDT	Special Weather Statement	BTV	Rutland	25 min

Nearby

Severe Thunderstorm Warnings in Vermont, 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.