Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Burlington, VT

July 20, 2021Orange County, Rutland County, Windsor County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 20, 2021, 8:54 PM EDT for Orange County, Rutland County, Windsor County, Vermont. It was in force for 66 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: Jul 20, 2021, 8:54 PM EDT (00:54 UTC)
Expired: Jul 20, 2021, 10:00 PM EDT
In force: 66 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Orange County, VT, Rutland County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 128 km from the middle of the area, began a volume at 00:56 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, 9:02 PM EDT	TSTM WND DMG	2 N Norwich, VT	MANY TREES UPROOTED IN A STRAIGHT LINE THROUGH THE NEW BOSTON ROAD AREA.
Jul 20, 9:02 PM EDT	TSTM WND DMG	Norwich, VT	TREES DOWN.
Jul 20, 9:07 PM EDT	TSTM WND DMG	Woodstock, VT	2 POPLAR TREES DOWN ON POWERLINES.

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

Albany, NY (KALY), launched 00:00Z, 0.9 hours before the alert went out and 126 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: 1226 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1198 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

420 
WUUS51 KBTV 210054
SVRBTV
VTC017-021-027-210200-
/O.NEW.KBTV.SV.W.0035.210721T0054Z-210721T0200Z/

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

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Southern Orange County in central Vermont...
  Southeastern Rutland County in southern Vermont...
  Windsor County in southern Vermont...

* Until 1000 PM EDT.

* At 852 PM EDT, a line of severe thunderstorms over south central 
  Vermont was located along a line extending from near South 
  Strafford to West Bridgewater to near North Pawlet, moving 
  southeast at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and powerlines. Minor hail 
           damage to vehicles is possible. 

* Locations impacted include...
  Woodstock, Chester, Hartland Four Corners, Cavendish, Ludlow
  Village, Perkinsville Village, Wallingford, Mt. Holly, Mt. Tabor,
  Rutland - Southern Vermont Airport, Pomfret, Plymouth, Hartland,
  Wells, Barnard, Windsor, Woodstock Village, Pawlet, Mount Holly and
  Ludlow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4325 7282 4330 7282 4330 7297 4329 7299
      4330 7298 4331 7326 4341 7325 4361 7276
      4386 7254 4377 7220 4370 7231 4360 7234
      4357 7238 4348 7238 4338 7242 4336 7239
      4333 7241 4331 7240 4323 7243 4322 7269
TIME...MOT...LOC 0052Z 320DEG 19KT 4384 7241 4358 7272 4340 7325 

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

Evenson/LaRocca

2 follow-up statements

370 
WWUS51 KBTV 210131
SVSBTV

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

VTC017-021-027-210200-
/O.CON.KBTV.SV.W.0035.000000T0000Z-210721T0200Z/
Orange VT-Rutland VT-Windsor VT-
931 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR SOUTHERN ORANGE...SOUTHEASTERN RUTLAND AND WINDSOR COUNTIES...

At 929 PM EDT, a line of severe thunderstorms was over portions of 
Rutland and Windsor counties in Vermont generally located along a 
line extending from near White River Junction to Felchville to 6 
miles south of Danby, moving southeast at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and powerlines. Minor hail 
         damage to vehicles is possible. 

Locations impacted include...
Woodstock, Chester, Hartland Four Corners, Cavendish, Ludlow Village,
Perkinsville Village, Wallingford, Mt. Holly, Mt. Tabor, Pomfret,
Plymouth, Hartland, Windsor, Woodstock Village, Pawlet, Mount Holly,
Ludlow, Sharon, Andover and Mount Tabor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4325 7282 4330 7282 4330 7297 4329 7299
      4330 7298 4331 7326 4336 7325 4353 7270
      4383 7242 4377 7220 4370 7231 4360 7234
      4357 7238 4348 7238 4338 7242 4336 7239
      4333 7241 4331 7240 4323 7243 4322 7269
TIME...MOT...LOC 0129Z 319DEG 19KT 4365 7226 4344 7256 4326 7309 

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

Evenson/LaRocca

590 
WWUS51 KBTV 210159
SVSBTV

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

VTC017-021-027-210209-
/O.EXP.KBTV.SV.W.0035.000000T0000Z-210721T0200Z/
Orange VT-Rutland VT-Windsor VT-
959 PM EDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ORANGE...SOUTHEASTERN
RUTLAND AND WINDSOR COUNTIES WILL EXPIRE AT 1000 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
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 4325 7282 4330 7282 4330 7297 4329 7299
      4330 7298 4331 7326 4336 7325 4353 7270
      4383 7242 4377 7220 4370 7231 4360 7234
      4357 7238 4348 7238 4338 7242 4336 7239
      4333 7241 4331 7240 4323 7243 4322 7269
TIME...MOT...LOC 0159Z 320DEG 19KT 4353 7212 4332 7242 4314 7295 

$$

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, 8:33 PM EDT	Severe Thunderstorm Warning	BTV	Orange, Windsor	42 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.