Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS Burlington, VT

July 20, 2021Essex County, New York; Addison County, Chittenden County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 20, 2021, 5:35 PM EDT for Essex County, New York; Addison County, Chittenden County, Vermont. It was in force for 55 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: Jul 20, 2021, 5:35 PM EDT (21:35 UTC)
Expired: Jul 20, 2021, 6:30 PM EDT
In force: 55 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Essex County, NY, Addison County, VT, Chittenden County, VT

The radar

The Burlington radar (KCXX), 30 km from the middle of the area, began a volume at 21:36 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
Jul 20, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.6 hours before the alert went out and 187 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: 85 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

320 
WUUS51 KBTV 202135
SVRBTV
NYC031-VTC001-007-202230-
/O.NEW.KBTV.SV.W.0030.210720T2135Z-210720T2230Z/

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

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Northeastern Essex County in northern New York...
  Northwestern Addison County in central Vermont...
  Southwestern Chittenden County in northwestern Vermont...

* Until 630 PM EDT.

* At 533 PM EDT, severe thunderstorms were located over Essex 
  County, New York, extending from near Keene to Wadhams, moving 
  northeast at 10 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, Willsboro, Westport, Elizabethtown, Charlotte, St. George,
  Kingsland Bay State Park, Shelburne, Ferrisburgh, Hinesburg,
  Williston, Lewis, Fort Cassin Point, Mcneil Cove, Sloop Island,
  Shelburne Falls, Wings Point, Town Farm Bay, Meach Island and North
  West Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Champlain, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4448 7353 4439 7307 4414 7341 4427 7379
TIME...MOT...LOC 2133Z 233DEG 10KT 4429 7369 4424 7347 

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

LaRocca/Evenson

1 follow-up statement

352 
WWUS51 KBTV 202213
SVSBTV

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

NYC031-VTC001-007-202230-
/O.CON.KBTV.SV.W.0030.000000T0000Z-210720T2230Z/
Essex NY-Addison VT-Chittenden VT-
613 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHEASTERN ESSEX...NORTHWESTERN ADDISON AND SOUTHWESTERN
CHITTENDEN COUNTIES...

At 611 PM EDT, an area of severe thunderstorms were located from 
Reber to Essex in Essex County, New York, moving northeast at 20 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, Willsboro, Westport, Elizabethtown, Charlotte, St. George,
Kingsland Bay State Park, Shelburne, Ferrisburgh, Hinesburg,
Williston, Lewis, Fort Cassin Point, Mcneil Cove, Sloop Island,
Shelburne Falls, Wings Point, Town Farm Bay, Meach Island and North
West Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Champlain, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4448 7353 4439 7307 4414 7341 4427 7379
TIME...MOT...LOC 2211Z 232DEG 22KT 4434 7346 4431 7334 

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

LaRocca/Evenson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 3:53 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	52 min
Jul 20, 4:44 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	61 min
Jul 20, 5:50 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex, Franklin	40 min
Jul 20, 6:31 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex	59 min
Jul 20, 7:32 PM EDT	Severe Thunderstorm Warning	BTV	Essex	58 min
Jul 20, 7:25 PM EDT	Special Weather Statement	BTV	Chittenden	110 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2021 Severe Thunderstorm Warnings in New York, 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.