Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Burlington, VT

July 20, 2021Orange County, Windsor County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 20, 2021, 8:33 PM EDT for Orange County, Windsor County, Vermont. It was in force for 42 min. 2 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: Jul 20, 2021, 8:33 PM EDT (00:33 UTC)
Expired: Jul 20, 2021, 9:15 PM EDT
In force: 42 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Orange County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 100 km from the middle of the area, began a volume at 00:35 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
Jul 20, 9:00 PM EDT	TSTM WND DMG	Thetford Center, VT	TREES DOWN.
Jul 20, 9:00 PM EDT	TSTM WND DMG	Thetford Center, VT	TREES DOWN.

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
Jul 20, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 0.6 hours before the alert went out and 154 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: 66 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1282 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

As transmitted.

968 
WUUS51 KBTV 210033
SVRBTV
VTC017-027-210115-
/O.NEW.KBTV.SV.W.0034.210721T0033Z-210721T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
833 PM EDT Tue Jul 20 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Orange County in central Vermont...
  Northeastern Windsor County in southern Vermont...

* Until 915 PM EDT.

* At 831 PM EDT, a severe thunderstorm was located near Chelsea, 
  Vermont moving east at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and powerlines as this storm 
           has a history of wind damage. Minor hail damage to 
           vehicles is possible along with very heavy rainfall. 

* Locations impacted include...
  Bradford, Thetford Hill State Park, Chelsea, Corinth, Randolph,
  Strafford, Thetford, Fairlee, West Fairlee, Tunbridge, Vershire,
  Corinth Corners, Washington, Thetford Center, Newbury Village,
  Williamstown, Brookfield, Braintree Hill, Newbury and Braintree.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4407 7205 4404 7208 4402 7208 4402 7209
      4399 7212 4397 7211 4396 7210 4395 7212
      4392 7212 4389 7217 4387 7217 4386 7219
      4381 7218 4377 7221 4391 7272 4413 7260
      4408 7203
TIME...MOT...LOC 0031Z 278DEG 28KT 4400 7250 

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

Evenson/LaRocca

2 follow-up statements

173 
WWUS51 KBTV 210100
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
900 PM EDT Tue Jul 20 2021

VTC017-027-210115-
/O.CON.KBTV.SV.W.0034.000000T0000Z-210721T0115Z/
Orange VT-Windsor VT-
900 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SOUTHEASTERN ORANGE AND NORTHEASTERN WINDSOR COUNTIES...

At 859 PM EDT, a severe thunderstorm was located near West Fairlee 
Center in Vermont, 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...
West Fairlee, Bradford, Tunbridge, Vershire, Corinth Corners,
Thetford Hill State Park, Thetford Center, Corinth, Strafford,
Newbury Village, Thetford, Fairlee, Chelsea, Washington, Newbury,
Topsham, Norwich, Orange, South Tunbridge and West Fairlee Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4407 7205 4404 7208 4402 7208 4402 7209
      4399 7212 4397 7211 4396 7210 4395 7212
      4392 7212 4389 7217 4387 7217 4386 7219
      4381 7218 4377 7221 4386 7252 4411 7240
      4408 7203
TIME...MOT...LOC 0059Z 278DEG 28KT 4397 7225 

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

Evenson/LaRocca

181 
WWUS51 KBTV 210115
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
915 PM EDT Tue Jul 20 2021

VTC017-027-210124-
/O.EXP.KBTV.SV.W.0034.000000T0000Z-210721T0115Z/
Orange VT-Windsor VT-
915 PM EDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ORANGE AND
NORTHEASTERN WINDSOR COUNTIES WILL EXPIRE AT 915 PM EDT...
        
The storm which prompted the warning is moving into New Hampshire.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern Vermont.

LAT...LON 4407 7205 4404 7208 4402 7208 4402 7209
      4399 7212 4397 7211 4396 7210 4395 7212
      4392 7212 4389 7217 4387 7217 4386 7219
      4381 7218 4377 7221 4386 7252 4411 7240
      4408 7203
TIME...MOT...LOC 0114Z 278DEG 28KT 4395 7210 

$$

Evenson/LaRocca

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:26 PM EDT	Special Weather Statement	BTV	Rutland, Windsor	64 min
Jul 20, 8:27 PM EDT	Special Weather Statement	BTV	Washington	2 hr
Jul 20, 8:54 PM EDT	Severe Thunderstorm Warning	BTV	Orange, Rutland, Windsor	66 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.