Very warm and humid airmass across the region on te afternoon of June 29th. One thunderstorm that developed across the southern Adirondacks during the afternoon quickly intensified in the northern Hudson Valley near Granville and then moved southeast across Pawlet in Rutland county before proceeding into Bennington county.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BTV wrote it up.
Very warm and humid airmass across the region on te afternoon of June 29th. One thunderstorm that developed across the southern Adirondacks during the afternoon quickly intensified in the northern Hudson Valley near Granville and then moved southeast across Pawlet in Rutland county before proceeding into Bennington county. One isolated report of tree down across utility lines along Route 30.
The local office's own words before the first event, 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 the first event at Jun 29, 2:36 PM EST, 11 minutes earlier.
Area Forecast Discussion National Weather Service Burlington VT 336 PM EDT Tue Jun 29 2021 .SYNOPSIS... Warm and humid conditions will continue across the North Country through Wednesday, before a surface front drops through the region resulting in slightly cooler temperatures for the middle to end of the week. Scattered showers and thunderstorms are likely with this front Wednesday, with greater areal coverage and the possibility of some stronger storms. Unsettled and cooler conditions are expected for the end of the week into the weekend with several more chances for precipitation. && .NEAR TERM /THROUGH WEDNESDAY NIGHT/... As of 336 PM EDT Tuesday...As expected, scattered showers and thunderstorms have developed across portions of the region this afternoon along an almost stationary frontal boundary draped over the international border. Most of this activity will wane this evening with the loss of daytime heating, but as the front edges into northern New York overnight, a long line of upstream convection will move in later this evening into Wednesday morning, mainly on a line from Alexandria Bay, NY to Swanton, VT. Elevated instability along the boundary should maintain embedded thunder, but not expecting any discrete thunderstorms. Big question going into Wednesday will be the potential for strong to sever storms. Based on the ongoing convective activity overnight, expect there to be a decent amount of cloud cover across northern portions of the forecast area Wednesday morning which will act to reduce instability during peak heating. Meanwhile, ahead of the front, CAPE values across south-central Vermont are expected to climb into the 1000-2000 J/kg range with a warm and moist airmass still in place. Upper-level height falls and favorable jet dynamics will help provide the synoptic forcing we've been lacking the past several days, and combined with sufficient deep layer shear of ~40 knots some strong to severe will be possible, mainly south of VT Route 2. This lines up well with SPC's Day 2 slight risk with primary threats being heavy rainfall and damaging winds. Convection will diminish Wednesday night as the front slowly sags southward but with only weak cold air advection expected under variable cloudiness, it'll be slow for temps and humidity to fall. Still by morning it should be way more comfortable than the past few days with temps in the mid/upper 60s and dewpoints in the upper 50s to low-60s. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... As of 336 PM EDT Tuesday...Trends in model data show the welcome cold front passing faster and settling farther south on Thursday morning. Therefore, more of our area will be dry with partial clearing and pleasant conditions through the day. High temperatures will top out only in the 70s with dew points noticeably lower in the 55 to 60 range in most locations. Wind fields will be very weak with a negligible pressure gradient, so even with daytime heating we will have only light northerly winds. As for precipitation, even in southern Rutland and Windsor counties nearer to a temperature gradient aloft, instability should be limited enough to prevent thunderstorm redevelopment. However, in response to a southward moving upper-level low near Lake Huron, southwesterly flow aloft will strengthen upwind and force a northward expansion of clouds and showers across our area. A light rainfall Thursday afternoon may occur over much of the southern half of Vermont and southern portions of the Adirondacks. Note that there are some indications that a coastal low will develop in response to the digging trough to our west, and this would act to consolidate precipitation well to our east. Therefore, we keep chances of rainfall moderately low at this time. For Thursday night, we bring those shower chances all the way northward. Again, with low-level flow out of the north we will see only light rainfall during this time period with a generally low predictibility event for any given location given a messy large- scale dynamical forcing for precipitation. Given the cooler air mass in place, expect low temperatures range through the 50s in most locations. && .LONG TERM /FRIDAY THROUGH TUESDAY/... The holiday weekend continues to be a difficult period to pin down for weather details given the unusual large-scale pattern. A relatively cool air mass will be overhead through the period, with temperatures near normal - highs mostly in the 72 to 82 range. While each day still has some precipitation chances, we are beginning to see some support for drier weather with a closed upper level low diving so far south and west that it takes most of the shower activity south of our area. As of 336 PM EDT Tuesday. This is when the 500 millibar low is most likely to be near Lake Ontario, which supports ample upper-level divergence that would promote widespread showers. Given that it will probably be the cloudiest day of the long term, Friday will also be the coolest day of the period. Saturday looks most likely to be dry in most locations as we may be positioned in a col between systems. Then on Sunday if the upper level low emerges over our area, we should see the impact of a cold pool aloft on afternoon and evening weather. Therefore, we have a slight chance of thunder. Again, the highly amplified steering pattern makes predictability quite low for this scenario, but we will keep a close eye given the holiday weekend. For early next week, it appears a stronger cold front may swing southeastward on Monday with a quick influx of warmer and more humid air out ahead streaming into our area. In this scenario, instability and shear could support strong thunderstorms, followed by much drier air advecting in from the north on Tuesday. Deep mixing on Tuesday would support temperatures just about as warm as on Monday, peaking in the low 80s in the lower valleys but with refreshingly drier air. && .AVIATION /20Z TUESDAY THROUGH SUNDAY/... Through 18Z Wednesday...VFR conditions are largely expected through the TAF period across most sites with brief MVFR/IFR possible in any showers/storms that hit a terminal this afternoon. Otherwise SCT mid clouds this afternoon increase in coverage this evening and through the overnight becoming BKN-OVC Wednesday. Some MVFR moves into portions of northern New York overnight with periods of showers likely, but all VT sites should remain VFR. Scattered showers and thunderstorms develop Wednesday afternoon with additional chances for lowering vsby/cigs. Winds variable today below 10kts, becoming light SSW overnight, and eventually gusty at 15-20kts from mid-morning Weds onward. Outlook... Wednesday Night: Mainly VFR, with local MVFR possible. Chance SHRA, Slight chance TSRA. Thursday: Mainly VFR, with local MVFR possible. Slight chance SHRA. Thursday Night: VFR. Chance SHRA. Friday: Mainly VFR, with areas MVFR possible. Chance SHRA. Friday Night: MVFR/IFR conditions possible. Chance SHRA. Saturday: Mainly VFR, with areas MVFR possible. Slight chance SHRA. Saturday Night: Mainly VFR, with local MVFR possible. Slight chance SHRA. Independence Day: VFR. Chance SHRA. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...Heat Advisory until 7 PM EDT this evening for VTZ009-011-012. NY...None. && SYNOPSIS...Lahiff NEAR TERM...Lahiff SHORT TERM...Kutikoff LONG TERM...Kutikoff AVIATION...Lahiff
Hazardous Weather Outlook National Weather Service Burlington VT 347 AM EDT Tue Jun 29 2021 NYZ026>031-034-035-087-VTZ001>008-010-016>019-300800- 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-Orange-Eastern Franklin-Eastern Chittenden- Eastern Addison-Eastern Rutland- 347 AM EDT Tue Jun 29 2021 This Hazardous Weather Outlook is for northern New York, central Vermont, northeast Vermont, northwest Vermont and southern Vermont. .DAY ONE...Today and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered showers and thunderstorms are expected on Wednesday, with a few strong to severe storms possible, especially across central and southern Vermont. The primary threat would be localized gusty winds, frequent lightning and very heavy down pours. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. VTZ009-011-012-300800- Western Addison-Western Rutland-Windsor- 347 AM EDT Tue Jun 29 2021 ...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Vermont and southern Vermont. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered showers and thunderstorms are expected on Wednesday, with a few strong to severe storms possible, especially across central and southern Vermont. The primary threat would be localized gusty winds, frequent lightning and very heavy down pours. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Burlington VT
308 PM EDT Tue Jun 29 2021
VTZ011-012-019-292015-
Eastern Rutland-Western Rutland-Windsor-
308 PM EDT Tue Jun 29 2021
...THUNDERSTORMS WILL AFFECT RUTLAND COUNTY THROUGH 4 PM...
COUNTIES...
At 305 PM EDT, radar indicated several developing thunderstorms in
the Northern Hudson Valley between Hague to Lake George. Movement
was east at 20 mph.
Winds in excess of 30 mph are possible with these storms and may
intensify further.
Locations impacted include...
Rutland, Castleton, Rutland City, Middletown Springs, Wallingford,
Mt. Holly, Mt. Tabor, Rutland - Southern Vermont Airport, Benson,
Poultney, Fair Haven, Clarendon, West Rutland, Ira, Wells, West
Castleton, Pawlet, Poultney Village, Mount Tabor and Tinmouth.
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.
Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.
LAT...LON 4330 7299 4331 7325 4353 7324 4356 7326
4358 7330 4360 7329 4363 7331 4363 7337
4357 7340 4359 7343 4362 7342 4364 7343
4374 7337 4363 7273 4330 7286 4330 7297
4329 7298 4329 7299
TIME...MOT...LOC 1905Z 289DEG 18KT 4370 7354 4346 7364 4339 7380
SLWSpecial Weather Statement National Weather Service Burlington VT 318 PM EDT Tue Jun 29 2021 NYZ029-030-087-292015- Southeastern St. Lawrence-Southern Franklin-Southwestern St. Lawrence- 318 PM EDT Tue Jun 29 2021 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN FRANKLIN AND SOUTHEASTERN ST. LAWRENCE COUNTIES... At 316 PM EDT, a strong thunderstorm was located near Hermon, moving east at 30 mph. Winds in excess of 40 mph and pea size hail are possible with this storm. Locations impacted include... Canton, Colton, Piercefield, Carry Falls Reservoir, Degrasse, Hermon, Lake Ozonia, Pierrepont, Russell, Stark, Pyrites, Conifer, Higley Flow State Park, Gale, North Russell, De Kalb Junction, Childwold, Shurtleff, South Colton and West Pierrepont. 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. If threatening weather approaches your location, seek shelter indoors. LAT...LON 4435 7533 4462 7525 4458 7459 4417 7453 TIME...MOT...LOC 1916Z 281DEG 26KT 4442 7519 Banacos
Special Weather Statement National Weather Service Burlington VT 327 PM EDT Tue Jun 29 2021 NYZ030-031-034-292030- Southern Franklin-Western Essex-Western Clinton- 327 PM EDT Tue Jun 29 2021 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL FRANKLIN AND NORTHWESTERN ESSEX COUNTIES... At 326 PM EDT, a strong thunderstorm was located over Madawaska, moving east at 30 mph. Winds in excess of 40 mph and pea size hail are possible with this storm. Locations impacted include... Saranac Lake, Adirondack Regional Airport, Lake Placid, Debar Mountain, Madawaska, Harrietstown, Paul Smiths, Saranac Inn, Ray Brook, Lake Colby, Rainbow Lake, Loon Lake, Gabriels, Lake Clear, Upper Saint Regis, Onchiota, St. Regis Mountain, Azure Mountain, Vermontville and Franklin Falls. 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 4435 7455 4463 7459 4458 7393 4428 7391 TIME...MOT...LOC 1926Z 281DEG 25KT 4452 7444 Banacos
The Albany radar (KENX), 113 km away, was scanning. The volume nearest the first event began at 19:47 UTC.
1 thunderstorm wind. Local standard time, as filed.
Tree down across utility lines along Route 30 near Route 153.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Vermont in 2021Every state in 2021This day in weather historyWarnings in Vermont, June 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 956995.