Alert archive / Vermont / Special Weather Statements in 2021

Special Weather Statement, NWS Burlington, VT

June 21, 2021Chittenden County, Vermont; Essex County, New York

NWS Burlington, VT issued this special weather statement at Jun 21, 2021, 8:19 PM EDT for Chittenden County, Vermont; Essex County, New York. It was in force for 26 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
Jun 21, 2021, 8:19 PM EDT (00:19 UTC)
Expired
Jun 21, 2021, 8:45 PM EDT
In force
26 min
Issued by
NWS Burlington, VT

Counties Essex County, NY, Chittenden County, VT

The radar

The Burlington radar (KCXX), 45 km from the middle of the area, began a volume at 00:19 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 00:00Z, 0.3 hours before the alert went out and 164 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 00:00Z on 2021-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1525 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2021-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 218 square meters per square second.193958Sfc1 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
1525 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1247 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
218 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
1.1
Supercell composite
12.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 21, 7:35 PM EDT, 44 minutes earlier.

Area forecast discussion, Jun 21, 7:35 PM EDT, 44 minutes before
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Hazardous weather outlook, Jun 21, 3:21 AM EDT, 16 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service Burlington VT
321 AM EDT Mon Jun 21 2021

NYZ026>031-034-035-087-VTZ001>012-016>019-220730-
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-
321 AM EDT Mon Jun 21 2021

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

.DAY ONE...Today and tonight.

Strong to severe thunderstorms are expected across much of northern
New York and Vermont this afternoon and evening. Strong wind gusts,
hail, very heavy downpours, and lightning will be the main threats
with any of the storms. Storms are expected to develop over the
Saint Lawrence Valley and northern Adirondacks of New York by early
this afternoon and move eastward across the remainder of northern
New York and Vermont during the late afternoon and evening hours. The
storms will exit to our south and east by midnight tonight.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jun 21, 7:06 PM EDT, 1 hour 13 minutes before
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Special weather statement, Jun 21, 7:29 PM EDT, 50 minutes before
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Special weather statement, Jun 21, 7:50 PM EDT, 29 minutes before
Special Weather Statement
National Weather Service Burlington VT
750 PM EDT Mon Jun 21 2021

NYZ035-VTZ008>012-018-019-220015-
Eastern Essex-Eastern Rutland-Western
Rutland-Windsor-Washington-Western Addison-Eastern Addison-Orange-
750 PM EDT Mon Jun 21 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ESSEX...
WEST CENTRAL ORANGE...SOUTHERN ADDISON...RUTLAND...NORTHWESTERN
WINDSOR AND SOUTHWESTERN WASHINGTON COUNTIES...

At 749 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Orwell to Comstock. Movement was
northeast at 35 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Middlebury, Rutland, Cornwall, Sudbury, Killington, Salisbury,
Rutland City, Orwell, Benson, Chittenden, West Rutland, Whiting,
Granville, Ira, West Castleton, Hancock, Shoreham, Poultney Village,
Ripton and Lake St. Catherine.

Frequent cloud to ground lightning and torrential rainfall is also
occurring with these storms. Lightning can strike 10 miles away from
a thunderstorm. Seek a safe shelter inside a building or vehicle.

These storms 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
      4362 7330 4363 7337 4357 7340 4359 7343
      4362 7342 4364 7343 4377 7335 4381 7338
      4380 7345 4386 7344 4420 7272 4358 7276
      4345 7325
TIME...MOT...LOC 2349Z 236DEG 32KT 4377 7328 4346 7347

Lahiff
Special weather statement, Jun 21, 7:50 PM EDT, 29 minutes before
Special Weather Statement
National Weather Service Burlington VT
750 PM EDT Mon Jun 21 2021

NYZ030-034-035-220015-
Southern Franklin-Western Essex-Eastern Essex-
750 PM EDT Mon Jun 21 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN
FRANKLIN...ESSEX...WESTERN ADDISON AND SOUTHWESTERN CHITTENDEN
COUNTIES...

At 749 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Lake Placid to 8 miles south of
Mount Marcy to near Minerva. Movement was northeast at 45 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Lake Placid, Essex, Moriah, Willsboro, Crown Point, Westport,
Elizabethtown, Keene, Minerva, Schroon Lake, Keene Valley, Port
Henry, Mount Marcy, Crown Point Center, Shoreham, Charlotte, Orwell,
Shelburne, North Elba and Lewis.

These storms 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 4380 7405 4383 7415 4381 7422 4385 7425
      4396 7415 4426 7414 4438 7333 4427 7331
      4419 7339 4405 7344 4402 7341 4393 7341
      4388 7337 4381 7338 4374 7406
TIME...MOT...LOC 2349Z 234DEG 41KT 4425 7393 4398 7392 4376 7409

Neiles
Special weather statement, Jun 21, 8:18 PM EDT, 1 minute before
Special Weather Statement
National Weather Service Burlington VT
818 PM EDT Mon Jun 21 2021

VTZ009>012-018-019-220115-
Eastern Rutland-Western Rutland-Windsor-Western Addison-Eastern
Addison-Orange-
818 PM EDT Mon Jun 21 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ORANGE...
SOUTHEASTERN ADDISON...NORTHERN RUTLAND AND NORTHWESTERN WINDSOR
COUNTIES...

At 818 PM EDT, a strong thunderstorm was located over Castleton,
moving northeast at 40 mph.

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

Locations impacted include...
Rutland, Castleton, Rutland City, Bethel, Rochester, Poultney,
Chittenden, Fair Haven, West Rutland, Goshen, West Castleton,
Hancock, Hubbardton, Poultney Village, Stockbridge, Proctor, Brandon,
Pittsfield, Pittsford and Royalton.

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.

LAT...LON 4351 7324 4352 7325 4353 7324 4356 7326
      4358 7328 4358 7330 4360 7329 4362 7330
      4363 7332 4362 7335 4366 7339 4402 7279
      4378 7249
TIME...MOT...LOC 0018Z 237DEG 34KT 4362 7320

Lahiff
Special weather statement, Jun 21, 8:19 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Burlington VT
819 PM EDT Mon Jun 21 2021

NYZ028-031-034-035-VTZ005-009-017-018-220045-
Eastern Clinton-Western Essex-Western Clinton-Eastern Essex-Eastern
Chittenden-Western Chittenden-Western Addison-Eastern Addison-
819 PM EDT Mon Jun 21 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTH CENTRAL
CLINTON...EASTERN ESSEX...WESTERN ADDISON AND WESTERN CHITTENDEN
COUNTIES...

At 819 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Willsboro to near Schroon Lake. Movement
was northeast at 50 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Essex Junction, Burlington International Airport, South Burlington,
Burlington, Vergennes, Middlebury, Moriah, Willsboro, Crown Point,
Westport, Elizabethtown, Schroon Lake, Orwell, Colchester, Essex
Junction Village, Addison, Shoreham, Shelburne, Charlotte and
Waltham.

LAT...LON 4461 7293 4380 7324 4379 7336 4381 7338
      4376 7392 4448 7363
TIME...MOT...LOC 0019Z 238DEG 43KT 4437 7343 4383 7369

Neiles

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 8:18 PM EDTSpecial Weather StatementBTVRutland57 min
Jun 21, 8:54 PM EDTSpecial Weather StatementBTVAddison, Chittenden, Franklin, Lamoille, Rutland, Washington66 min
Jun 21, 9:59 PM EDTSpecial Weather StatementBTVRutland, Windsor61 min

Nearby

Special Weather Statements in Vermont, 2021Special Weather Statements in New York, 2021Every special weather statement 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.