Alert archive / Vermont / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 59, NWS Burlington, VT

August 24, 2020Addison County, Rutland County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Aug 24, 2020, 4:11 PM EDT for Addison County, Rutland County, Vermont. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 24, 2020, 4:11 PM EDT (20:11 UTC)
Expired: Aug 24, 2020, 5:15 PM EDT
In force: 64 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Addison County, VT, Rutland County, VT

The radar

The Burlington radar (KCXX), 79 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 138 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: 21 J/kg
Mixed-layer CIN: -214 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Burlington, VT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 24, 4:02 PM EDT, 9 minutes earlier.

Area forecast discussion, Aug 24, 4:02 PM EDT, 9 minutes before

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Hazardous weather outlook, Aug 24, 4:21 AM EDT, 11 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Burlington VT
421 AM EDT Mon Aug 24 2020

NYZ026>031-034-035-087-VTZ001>012-016>019-250830-
Northern St. Lawrence-Northern Franklin-Eastern Clinton-
Southeastern St. Lawrence-Southern Franklin-Western Clinton-
Western Essex-Eastern Essex-Southwestern St. Lawrence-Grand Isle-
Western Franklin-Orleans-Essex-Western Chittenden-Lamoille-Caledonia-
Washington-Western Addison-Orange-Western Rutland-Windsor-
Eastern Franklin-Eastern Chittenden-Eastern Addison-Eastern Rutland-
421 AM EDT Mon Aug 24 2020

This Hazardous Weather Outlook is for northern New York, central
Vermont, northeast Vermont, northwest Vermont and southern Vermont.

.DAY ONE...Today and tonight.

Scattered showers and thunderstorms will develop this afternoon,
especially along the International Border. A few strong storms are
possible, with gusty winds, dangerous cloud to ground lightning, and
brief heavy rainfall the primary threats.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

A strong cold front will move across the region around sunrise on
Tuesday through the early afternoon. Scattered showers and
thunderstorms will develop along the front. The front will reach the
eastern Adirondacks and Champlain Valley by late morning and into
eastern Vermont during the afternoon. This region from the eastern
Adirondacks into Vermont will have the greatest chance of strong to
locally severe storms capable of damaging winds, frequent lightning,
and brief heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 24, 3:11 PM EDT, 1 hour before

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Local storm report, Aug 24, 3:56 PM EDT, 15 minutes before

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Special weather statement, Aug 24, 3:57 PM EDT, 14 minutes before

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Local storm report, Aug 24, 3:58 PM EDT, 13 minutes before

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Special weather statement, Aug 24, 4:01 PM EDT, 10 minutes before

Special Weather Statement
National Weather Service Burlington VT
401 PM EDT Mon Aug 24 2020

VTZ004-007-242100-
Essex-Caledonia-
401 PM EDT Mon Aug 24 2020

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL CALEDONIA AND SOUTHERN
ESSEX COUNTIES...

At 401 PM EDT, a strong thunderstorm was located near Barnet, moving
east at 25 mph.

Winds in excess of 40 mph and dime size hail are possible with this
storm.

Locations impacted include...
St. Johnsbury, Lyndon, Waterford, Lyndonville Village, Stannard,
Kirby, Barnet, Concord, Lunenburg, Danville, Lower Waterford,
Peacham, Walden, Victory, Wheelock, Guildhall, Ryegate, St. Johnsbury
Center, Concord Corner and West Waterford.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4448 7160 4448 7163 4449 7163 4447 7165
      4446 7164 4442 7170 4440 7179 4438 7181
      4435 7182 4434 7187 4435 7191 4432 7203
      4430 7204 4428 7207 4425 7206 4427 7219
      4455 7223 4452 7159 4450 7158
TIME...MOT...LOC 2001Z 276DEG 22KT 4437 7209

Clay

Special weather statement, Aug 24, 4:03 PM EDT, 8 minutes before

Special Weather Statement
National Weather Service Burlington VT
403 PM EDT Mon Aug 24 2020

VTZ009-011-019-242100-
Eastern Rutland-Western Rutland-Western Addison-
403 PM EDT Mon Aug 24 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN ADDISON AND
NORTHWESTERN RUTLAND COUNTIES...

At 403 PM EDT, a strong thunderstorm was located near West Haven,
moving east at 20 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Rutland, Castleton, West Castleton, Hubbardton, Proctor, Benson,
Poultney, Fair Haven, West Rutland, Pittsford, Ira, West Haven,
Middletown Springs, Sudbury, Orwell, Benson Bay, Hydeville, Bomoseen
State Park, Florence and Half Moon State Park.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4353 7324 4356 7326 4358 7330 4360 7329
      4363 7331 4363 7337 4358 7339 4359 7343
      4362 7342 4364 7343 4365 7342 4369 7341
      4373 7337 4378 7335 4373 7297 4348 7309
TIME...MOT...LOC 2003Z 288DEG 15KT 4370 7341

Clay

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 8:19 PM EDT	Special Weather Statement	BTV	Windsor	26 min
Aug 23, 8:30 PM EDT	Severe Thunderstorm Warning	BTV	Windsor	30 min
Aug 23, 8:48 PM EDT	Special Weather Statement	BTV	Rutland	27 min
Aug 23, 9:11 PM EDT	Special Weather Statement	BTV	Windsor	19 min
Aug 23, 9:13 PM EDT	Special Weather Statement	BTV	Addison	32 min
Aug 23, 10:30 PM EDT	Special Weather Statement	BTV	Orange	45 min
Aug 24, 1:48 PM EDT	Special Weather Statement	BTV	Chittenden	42 min
Aug 24, 1:53 PM EDT	Special Weather Statement	BTV	Grand Isle	52 min
Aug 24, 2:07 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Franklin, Grand Isle	38 min
Aug 24, 2:19 PM EDT	Special Weather Statement	BTV	Chittenden	56 min
Aug 24, 2:40 PM EDT	Special Weather Statement	BTV	Chittenden	50 min
Aug 24, 2:56 PM EDT	Special Weather Statement	BTV	Addison	49 min
Aug 24, 3:10 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Washington	50 min
Aug 24, 3:17 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland	29 min
Aug 24, 3:57 PM EDT	Special Weather Statement	BTV	Washington	48 min
Aug 24, 4:01 PM EDT	Special Weather Statement	BTV	Caledonia	59 min
Aug 24, 4:03 PM EDT	Special Weather Statement	BTV	Rutland	57 min
Aug 24, 4:13 PM EDT	Special Weather Statement	BTV	Orange	47 min
Aug 24, 4:37 PM EDT	Special Weather Statement	BTV	Essex	38 min
Aug 24, 5:11 PM EDT	Severe Thunderstorm Warning	BTV	Rutland	49 min
Aug 24, 5:59 PM EDT	Special Weather Statement	BTV	Rutland	46 min
Aug 24, 6:20 PM EDT	Flash Flood Warning	BTV	Rutland	3 hr
Aug 24, 7:07 PM EDT	Special Weather Statement	BTV	Rutland	38 min
Aug 24, 7:38 PM EDT	Special Weather Statement	BTV	Orleans	52 min
Aug 24, 7:41 PM EDT	Special Weather Statement	BTV	Rutland	34 min
Aug 23, 10:21 PM EDT	Special Weather Statement	BTV	St. Lawrence	54 min
Aug 23, 11:11 PM EDT	Special Weather Statement	BTV	St. Lawrence	64 min
Aug 24, 12:09 AM EDT	Special Weather Statement	BTV	Clinton, Franklin	66 min
Aug 24, 12:54 PM EDT	Special Weather Statement	BTV	Clinton	51 min
Aug 24, 1:07 PM EDT	Special Weather Statement	BTV	Clinton	38 min
Aug 24, 1:46 PM EDT	Special Weather Statement	BTV	Clinton	44 min
Aug 24, 2:01 PM EDT	Special Weather Statement	BTV	St. Lawrence	59 min
Aug 24, 3:01 PM EDT	Special Weather Statement	BTV	Warren	44 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2020 Every severe thunderstorm warning in 2020

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.