Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Burlington, VT

September 6, 20216 counties in Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Sep 6, 2021, 1:36 PM EDT for 6 counties in Vermont. It was in force for 24 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
Sep 6, 2021, 1:36 PM EDT (17:36 UTC)
Expired
Sep 6, 2021, 2:00 PM EDT
In force
24 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, Orange County, VT, Washington County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 59 km from the middle of the area, began a volume at 17:40 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 nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.6 hours before the alert went out and 172 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-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2021-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2021-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
36 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
791 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

011 
WUUS51 KBTV 061736
SVRBTV
VTC001-005-007-017-023-027-061800-
/O.NEW.KBTV.SV.W.0039.210906T1736Z-210906T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
136 PM EDT Mon Sep 6 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Southwestern Caledonia County in northeastern Vermont...
  Western Orange County in central Vermont...
  East central Addison County in central Vermont...
  Southeastern Chittenden County in northwestern Vermont...
  North central Windsor County in southern Vermont...
  Southern Washington County in central Vermont...

* Until 200 PM EDT.

* At 136 PM EDT, a severe thunderstorm was located over East Warren,
  moving east at 45 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, Braintree Hill, Plainfield, Orange,
  Chelsea, Websterville, Lincoln, Randolph, Waitsfield, Berlin,
  Fayston, Granville, Barre Town, Northfield Village, Tunbridge,
  Hancock, Washington and Warren.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4393 7317 4423 7290 4427 7232 4386 7250
TIME...MOT...LOC 1736Z 266DEG 40KT 4410 7282 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RSD
1 follow-up statement
885 
WWUS51 KBTV 061757
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
157 PM EDT Mon Sep 6 2021

VTC001-005-007-017-023-027-061806-
/O.EXP.KBTV.SV.W.0039.000000T0000Z-210906T1800Z/
Caledonia VT-Orange VT-Addison VT-Chittenden VT-Windsor VT-
Washington VT-
157 PM EDT Mon Sep 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CALEDONIA...
WESTERN ORANGE...EAST CENTRAL ADDISON...SOUTHEASTERN CHITTENDEN...
NORTH CENTRAL WINDSOR AND SOUTHERN WASHINGTON COUNTIES WILL EXPIRE AT
200 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, 
additional showers and thunderstorms will continue across the area 
through this afternoon. Gusty winds and heavy rain will be possible 
with this additional activity.

LAT...LON 4393 7317 4423 7290 4427 7232 4386 7250
TIME...MOT...LOC 1756Z 266DEG 40KT 4411 7255 

$$

Hastings

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 11:56 AM EDTSpecial Weather StatementBTVGrand Isle34 min
Sep 6, 12:04 PM EDTSpecial Weather StatementBTVAddison26 min
Sep 6, 12:17 PM EDTSpecial Weather StatementBTVGrand Isle28 min
Sep 6, 12:26 PM EDTSpecial Weather StatementBTVAddison34 min
Sep 6, 12:33 PM EDTSpecial Weather StatementBTVFranklin27 min
Sep 6, 12:41 PM EDTSpecial Weather StatementBTVChittenden34 min
Sep 6, 12:44 PM EDTSpecial Weather StatementBTVGrand Isle31 min
Sep 6, 12:58 PM EDTSpecial Weather StatementBTVWindsor32 min
Sep 6, 1:01 PM EDTSpecial Weather StatementBTVFranklin29 min
Sep 6, 1:05 PM EDTSpecial Weather StatementBTVWashington25 min
Sep 6, 1:14 PM EDTSpecial Weather StatementBTVAddison31 min
Sep 6, 1:17 PM EDTSpecial Weather StatementBTVLamoille28 min
Sep 6, 1:48 PM EDTSpecial Weather StatementBTVRutland27 min
Sep 6, 1:51 PM EDTSpecial Weather StatementBTVEssex24 min
Sep 6, 2:06 PM EDTSpecial Weather StatementBTVOrange39 min
Sep 6, 2:20 PM EDTSpecial Weather StatementBTVOrange, Windsor40 min
Sep 6, 4:38 PM EDTSpecial Weather StatementBTVChittenden, Franklin37 min
Sep 6, 5:13 PM EDTSpecial Weather StatementBTVChittenden, Lamoille32 min
Sep 6, 5:43 PM EDTSpecial Weather StatementBTVCaledonia, Washington32 min
Sep 6, 6:14 PM EDTSpecial Weather StatementBTVCaledonia46 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2021Every 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.