Alert archive / Vermont / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 37, NWS Burlington, VT
NWS Burlington, VT issued this severe thunderstorm warning at Aug 11, 2021, 4:47 PM EDT for 5 counties in Vermont. It was in force for 43 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
- Aug 11, 2021, 4:47 PM EDT (20:47 UTC)
- Expired
- Aug 11, 2021, 5:30 PM EDT
- In force
- 43 min
- Issued by
- NWS Burlington, VT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Addison County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 61 km from the middle of the area, began a volume at 20:47 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 |
|---|---|---|---|
| Aug 11, 4:47 PM EDT | TSTM WND DMG | 2 S Cornwall, VT | TREE DOWN ON POWERLINE. |
| Aug 11, 5:00 PM EDT | TSTM WND GST 51 | 1 W Middlebury, VT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 8.8 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.
- Mixed-layer CAPE
- 112 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 261 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
192 WUUS51 KBTV 112047 SVRBTV VTC001-017-021-023-027-112130- /O.NEW.KBTV.SV.W.0037.210811T2047Z-210811T2130Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Burlington VT 447 PM EDT Wed Aug 11 2021 The National Weather Service in Burlington has issued a * Severe Thunderstorm Warning for... West central Orange County in central Vermont... Central Addison County in central Vermont... Northeastern Rutland County in southern Vermont... Northwestern Windsor County in southern Vermont... Southwestern Washington County in central Vermont... * Until 530 PM EDT. * At 446 PM EDT, a severe thunderstorm was located over Cornwall, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and powerlines. * Locations impacted include... Middlebury, Cornwall, Weybridge, Hancock, Shoreham, Salisbury, Warren, Ripton, Lincoln, Rochester, Leicester, Braintree, Whiting, Granville, Bridport, Goshen, Roxbury, New Haven, Addison and Bristol. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4388 7334 4406 7335 4417 7274 4384 7270 TIME...MOT...LOC 2046Z 266DEG 25KT 4398 7324 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Lahiff
2 follow-up statements
168 WWUS51 KBTV 112111 SVSBTV Severe Weather Statement National Weather Service Burlington VT 511 PM EDT Wed Aug 11 2021 VTC001-017-021-023-027-112130- /O.CON.KBTV.SV.W.0037.000000T0000Z-210811T2130Z/ Orange VT-Addison VT-Rutland VT-Windsor VT-Washington VT- 511 PM EDT Wed Aug 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR WEST CENTRAL ORANGE...CENTRAL ADDISON...NORTHEASTERN RUTLAND... NORTHWESTERN WINDSOR AND SOUTHWESTERN WASHINGTON COUNTIES... At 511 PM EDT, a severe thunderstorm was located over Ripton, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and powerlines. Locations impacted include... Middlebury, Hancock, Salisbury, Warren, Ripton, Lincoln, Rochester, Leicester, Braintree, Granville, Goshen, Roxbury, New Haven, Bristol, Bethel, Waitsfield, Cornwall, Northfield, East Middlebury and Branbury State Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4387 7317 4409 7318 4417 7274 4384 7270 TIME...MOT...LOC 2111Z 266DEG 25KT 4399 7300 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...OBSERVED MAX WIND GUST...60 MPH $$ Lahiff
381
WWUS51 KBTV 112128
SVSBTV
Severe Weather Statement
National Weather Service Burlington VT
528 PM EDT Wed Aug 11 2021
VTC001-017-021-023-027-112137-
/O.EXP.KBTV.SV.W.0037.000000T0000Z-210811T2130Z/
Orange VT-Addison VT-Rutland VT-Windsor VT-Washington VT-
528 PM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL ORANGE...CENTRAL
ADDISON...NORTHEASTERN RUTLAND...NORTHWESTERN WINDSOR AND
SOUTHWESTERN WASHINGTON COUNTIES WILL EXPIRE AT 530 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
is still possible with this thunderstorm.
LAT...LON 4387 7317 4409 7318 4417 7274 4384 7270
TIME...MOT...LOC 2127Z 266DEG 25KT 4400 7285
$$
LahiffThe office that day
Everything else NWS Burlington, VT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:30 PM EDT | Special Weather Statement | BTV | Addison | 30 min |
| Aug 11, 5:03 PM EDT | Special Weather Statement | BTV | Chittenden | 27 min |
| Aug 11, 5:35 PM EDT | Special Weather Statement | BTV | Chittenden | 40 min |
| Aug 11, 6:11 PM EDT | Special Weather Statement | BTV | Lamoille | 34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.