Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Burlington, VT

June 30, 2021Chittenden County, Lamoille County, Washington County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jun 30, 2021, 1:15 PM EDT for Chittenden County, Lamoille County, Washington County, Vermont. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 30, 2021, 1:15 PM EDT (17:15 UTC)
Expired: Jun 30, 2021, 2:15 PM EDT
In force: 60 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chittenden County, VT, Lamoille County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 25 km from the middle of the area, began a volume at 17:17 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.

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 30, 12:06 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.3 hours before the alert went out and 204 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: 113 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

970 
WUUS51 KBTV 301715
SVRBTV
VTC007-015-023-301815-
/O.NEW.KBTV.SV.W.0021.210630T1715Z-210630T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
115 PM EDT Wed Jun 30 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Southwestern Lamoille County in northwestern Vermont...
  East central Chittenden County in northwestern Vermont...
  Northwestern Washington County in central Vermont...

* Until 215 PM EDT.

* At 114 PM EDT, a severe thunderstorm was located over St. George,
  moving east at 30 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...
  Essex Junction, Montpelier, South Burlington, Jericho, St. George,
  Stowe, Duxbury, Essex, Waterbury Village, East Montpelier, Jericho
  Village, Waterbury, Essex Junction Village, Williston, Worcester,
  Middlesex, Bolton, Richmond, Hinesburg and Huntington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4434 7317 4454 7314 4447 7248 4426 7251
TIME...MOT...LOC 1714Z 276DEG 26KT 4440 7314 

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

Kutikoff

2 follow-up statements

224 
WWUS51 KBTV 301742
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
142 PM EDT Wed Jun 30 2021

VTC007-015-023-301815-
/O.CON.KBTV.SV.W.0021.000000T0000Z-210630T1815Z/
Lamoille VT-Chittenden VT-Washington VT-
142 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR SOUTHWESTERN LAMOILLE...EAST CENTRAL CHITTENDEN AND NORTHWESTERN
WASHINGTON COUNTIES...

At 141 PM EDT, a severe thunderstorm was located over North Duxbury,
moving east at 30 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...
Montpelier, Stowe, Duxbury, Waterbury Village, East Montpelier,
Waterbury, Worcester, Middlesex, Bolton, Huntington, Elmore, Calais,
Moretown, Underhill, Waterbury Center, North Moretown, Mount
Worcester, Moscow, North Duxbury and Maple Corner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4431 7294 4451 7288 4447 7248 4426 7251
TIME...MOT...LOC 1741Z 286DEG 27KT 4436 7283 

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

Kutikoff

522 
WWUS51 KBTV 301807
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
207 PM EDT Wed Jun 30 2021

VTC007-015-023-301816-
/O.EXP.KBTV.SV.W.0021.000000T0000Z-210630T1815Z/
Lamoille VT-Chittenden VT-Washington VT-
207 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAMOILLE...EAST
CENTRAL CHITTENDEN AND NORTHWESTERN WASHINGTON COUNTIES WILL EXPIRE
AT 215 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.  However heavy 
rain and dangerous cloud to ground lightning is still possible with 
this thunderstorm.

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

LAT...LON 4431 7294 4451 7288 4447 7248 4426 7251
TIME...MOT...LOC 1806Z 276DEG 26KT 4434 7259 

$$

Kutikoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 12:44 PM EDT	Special Weather Statement	BTV	Chittenden	46 min
Jun 30, 12:46 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland	59 min
Jun 30, 1:37 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland, Windsor	53 min
Jun 30, 1:45 PM EDT	Special Weather Statement	BTV	Orange	60 min
Jun 30, 2:17 PM EDT	Special Weather Statement	BTV	Caledonia	58 min
Jun 30, 2:24 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland, Windsor	66 min
Jun 30, 2:56 PM EDT	Special Weather Statement	BTV	Windsor	49 min
Jun 30, 7:28 PM EDT	Special Weather Statement	BTV	Caledonia, Essex, Lamoille, Orleans	62 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.