Scattered severe thunderstorms moved across western New England resulting in downed trees during the afternoon and evening of the 29th.
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 ALY wrote it up.
Scattered severe thunderstorms moved across western New England resulting in downed trees during the afternoon and evening of the 29th.
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 Albany, NY wrote its last area forecast discussion before the first event at Jun 29, 1:04 PM EST, 2 hours 26 minutes earlier.
AREA FORECAST DISCUSSION
National Weather Service Albany NY
204 PM EDT Tue Jun 29 2021
.SYNOPSIS...
Oppressive heat continues today with additional hot and
humid weather expected tomorrow. A few scattered showers and storms
are possible today but a stronger cold front tracks through the
region tomorrow resulting in showers and strong to severe
thunderstorms. Cooler weather returns Thursday into the weekend with
showers and isolated thunderstorms each day as the cold front stalls
just south of our region.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Heat Advisory in effect from 11 AM TO 8 PM EDT today for the
Hudson Valley, eastern Mohawk Valley, southern Taconics in New
York, Litchfield Hills in Connecticut, Berkshires and the
Connecticut River Valley in southern Vermont...
Heat Advisory has been expanded to cover the eastern Catskills
including the Helderbergs and Schoharie Valley in addition to
the northern and central Taconics in New York and the southern
Greens in southern Vermont from 11AM to 8PM EDT today.
As of 1:45 PM EDT...Oppressive heat and humidity once again
plaque the Northeast today (although our friends in the Pacific
Northwest continue to endure a historic heat wave). Temperatures
as we near 2PM are already well into the low 90s throughout the
Hudson Valley with parts of the mid-Hudson Valley in the mid-
90s. Given dew points in the low to mid-70s, heat index values
are already range 95 to 105F. We are still holding off an
excessive heat warning for parts of the mid-Hudson Valley since
temperatures have been holding steady in the mid-90s and and we
not see two hours with heat index values 105F or higher.
Elsewhere, the cloud field has expanded decently across the
southern Adirondacks, Upper Hudson Valley and Mohawk Valley with
some isolated to scattered showers and storms developing.
Despite the high instability values, shear and lapse rates are
weak and marginal shear are keeping storms rather weak.
However, DCAPE values in excess of 1000 J/kg south of I-90 could
support some strong to even severe storms with damaging winds
and heavy downpours the main concern. Otherwise, the increased
cloud coverage could slow down the rate at which temperatures
continue to warm this afternoon preventing heat index values
from rising much higher than current readings.
Storms should remain scattered at best through the evening. Some
isolated to scattered showers and some rumbles are possible overnight
as showalters remain near 0 ahead of the very slowly approaching main
parent trough currently over the Great Lakes. Otherwise, it
will be another very mild and humid night with low temperatures
only falling into the low to mid 70s. This unfortunately will
not provide much relief from the heat.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/...
Any lingering thunderstorm activity dissipates during the
evening and it will be another humid night. Upper energy in
Canada begins to drop south through the day Wednesday, and as
upper heights lower and boundary layer temperatures begin to
cool from the north, some strong to severe thunderstorms are
expected Wednesday afternoon and evening.
Before the storms develop, a period of sunshine should help
temperatures reach highs in the upper 80s to lower 90s and
cooler in higher terrain. Heat indices will reach the mid 90s to
around 100 again in some areas, and Heat Advisories may be
needed.
The heat and humidity will result in CAPEs exceeding 2000 j/kg
in some areas and deep layer shear will be considerable.
Boundary layer winds increase and a boundary layer wind shift
will aid in some low level convergence. Midlevel lapse rates
will not be very steep but surface based instability, again will
be enough for strong to severe thunderstorms, with gusty winds
and hail. The deep moisture over our region suggests locally
very heavy rain and some standing water in low lying areas in
some storms.
Slow and gradual cooling from the north Wednesday night through
Thursday night as an upper closed low forms in the Great Lakes
and OH Valley. The low level boundary drifts slowly south as
increasing boundary layer convergence forms along the low level
boundary in response to the approaching upper low and upper
dynamics. So, clouds, showers and isolated thunderstorms
Wednesday night through Thursday night, with the best coverage
trending toward the mid Hudson Valley and NW CT through the day
Thursday and into Thursday night.
Highs Thursday in the 70s with near 80 in some northern areas
where there should be the least coverage of showers. Lows
Thursday night in the mid 50s to lower 60s.
&&
.LONG TERM /FRIDAY THROUGH MONDAY/...
The Independence Day weekend is still characterized by considerable
uncertainty tied to the interaction between a positively tilted
trough moving south out of QC/ON and upstream high amplitude ridge
over western ON at the start of the period. Deterministic models
have been all over the place in their run-to-run depiction of this
interaction. However, 00Z.29 suite has come into better agreement
in the Fri-Sat timeframe, with an anticyclonic wave break over ON/QC
forcing the trough to cutoff and move southwestward into the Ohio
Valley. As this occurs, gradual height falls will shunt the
anomalous moisture further south away from the forecast area Friday.
However, some weak surface waves along the departing baroclinic zone
and some weak surface convergence may result in some scattered
showers on Friday. There is also a favorably positioned equatorward
entrance region of the upper jet forecast to be over our area early
in the day. It looks like a seasonably cool day on the cool side of
the departing baroclinic zone with east/northeasterly low level
flow. On Saturday, the best midlevel forcing is forecast to be well
to our southwest, and there are some signals that a weak area of
high pressure builds in from the north. However, will maintain
chance PoPs out of respect for the lack of run-to-run model
continuity. Another seasonably cool day is forecast.
For Independence Day (Sunday) and Monday, the cutoff low is expected
to eject northeastward, but there is considerable uncertainty on the
speed and track of the ejection. As this low approaches closer to
the forecast area, it is likely to keep the weather unsettled,
although it remains to be seen how widespread or long-lived any
rounds of precipitation are. PoPs stay in the chance range until
more certainty can be gained. Temps are equally uncertain, but
generally trending a bit upward toward normal values.
&&
.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
Through 18z/Wed...VFR conditions are expected for the majority of
the TAF period. This afternoon will be similar to yesterday and
consist of convective cumulus clouds above 5000 feet with isolated
showers and thunderstorms around. Coverage of storms still looks to
be rather sparse, so will maintain VCSH at all sites this afternoon,
but a brief period of MVFR/IFR cannot be ruled out in any heavier
shower or storm that passes directly over the terminal.
Activity will dissipate this evening with some patchy clouds
lingering through the overnight. Due to the additional clouds, fog
chances are not high enough to include in the TAF.
Convective clouds gradually redevelop Wednesday morning with a
greater coverage of showers/thunderstorms during the afternoon, but
these begin after 18z/Wed.
Wind will be out of the west to southwest at 10 kt or less through
the TAF period, with the lightest winds tonight.
Outlook...
Wednesday Night: High Operational Impact. Likely SHRA...TSRA.
Thursday: High Operational Impact. Scattered SHRA...TSRA.
Thursday Night: Moderate Operational Impact. Scattered SHRA...TSRA.
Friday: Moderate Operational Impact. Chance of SHRA...TSRA.
Friday Night: Moderate Operational Impact. Chance of SHRA.
Saturday: Moderate Operational Impact. Chance of SHRA.
Saturday Night: Moderate Operational Impact. Chance of SHRA.
Independence Day: Moderate Operational Impact. Chance of SHRA...TSRA.
&&
.FIRE WEATHER...
Hot and humid weather is expected through Wednesday. A cold
front tracks through Wednesday night with showers and some
strong thunderstorms. Cooler weather Thursday into the weekend
with showers and isolated thunderstorms each day as the cold
front stalls just south of our region.
RH values will fall to around 50 percent this afternoon. RH
values rise to above 70 percent tonight, then fall to the 50 to
70 percent range Wednesday afternoon.
Winds will be south to southwest increasing to 10 to 15 mph
during the day today and through tonight. Winds become west
Wednesday afternoon at around 15 mph.
&&
.HYDROLOGY...
Scattered showers and thunderstorms are expected throughout the
upcoming week, especially in the afternoon and evening. Total
rainfall forecast through Friday ranges from around three
quarters of an inch across the northern part of the forecast
area to 1.5 to 2 inches across the southern part of the forecast
area. Although no widespread hydrological issues are expected
at this time, locally heavy rainfall is possible in any
thunderstorms which may lead to some standing water in urban,
and low lying areas.
For details on specific area rivers and lakes, including
observed and forecast river stages and lake elevations, please
visit the Advanced Hydrologic Prediction Service /AHPS/ graphs
on our website.
&&
.CLIMATE...
Record High Temperatures for June 29th:
Albany, NY: 96F set in 1944
Glens Falls, NY: 95F set in 1944
Poughkeepsie, NY: 102F set in 1933
&&
.ALY WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT this evening for CTZ001-013.
NY...Heat Advisory until 8 PM EDT this evening for NYZ038>041-043-
047>054-058>061-063>066-083-084.
MA...Heat Advisory until 8 PM EDT this evening for MAZ001-025.
VT...Heat Advisory until 8 PM EDT this evening for VTZ013>015.
&&
SYNOPSIS...NAS/Speciale
NEAR TERM...NAS/Speciale
SHORT TERM...NAS
LONG TERM...Thompson
AVIATION...Rathbun
FIRE WEATHER...NAS
HYDROLOGY...NAS
CLIMATE...WFO ALYHazardous Weather Outlook National Weather Service Albany NY 407 PM EDT Tue Jun 29 2021 NYZ032-033-042-082-301200- Northern Herkimer-Hamilton-Northern Warren-Northern Fulton- 407 PM EDT Tue Jun 29 2021 This Hazardous Weather Outlook is for the southern Adirondacks in eastern New York. .DAY ONE...Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a slight risk for severe thunderstorms tomorrow with severe storms capable of producing damaging winds, frequent lightning and heavy rainfall. Ponding of water on roadways and standing water in low lying areas is possible. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. MAZ001-NYZ038>041-043-047-048-051-054-058-063-083-084-VTZ013>015- 301200- Northern Berkshire-Southern Herkimer-Southern Fulton-Montgomery- Northern Saratoga-Northern Washington-Schoharie-Western Schenectady- Western Albany-Eastern Rensselaer-Western Greene-Western Ulster- Southeast Warren-Southern Washington-Bennington-Western Windham- Eastern Windham- 407 PM EDT Tue Jun 29 2021 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for the northern Berkshires in western Massachusetts, the eastern Catskills in eastern New York, and southern Vermont. .DAY ONE...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. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. There is an enhanced risk for severe thunderstorms tomorrow with severe storms capable of producing damaging winds, frequent lightning and heavy rainfall. Ponding of water on roadways and standing water in low lying areas is possible. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed. CTZ001-013-MAZ025-NYZ049-050-052-053-059>061-064>066-301200- Northern Litchfield-Southern Litchfield-Southern Berkshire- Eastern Schenectady-Southern Saratoga-Eastern Albany- Western Rensselaer-Eastern Greene-Western Columbia-Eastern Columbia- Eastern Ulster-Western Dutchess-Eastern Dutchess- 407 PM EDT Tue Jun 29 2021 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT WEDNESDAY... This Hazardous Weather Outlook is for northwestern Connecticut, the southern Berkshires in western Massachusetts, the southern Taconics and the Hudson Valley from the Capital District to the mid-Hudson Valley in eastern New York. .DAY ONE...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. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. There is an enhanced risk for severe thunderstorms tomorrow with severe storms capable of producing damaging winds, frequent lightning and heavy rainfall. Ponding of water on roadways and standing water in low lying areas is possible. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed.
Special Weather Statement
National Weather Service Albany NY
316 PM EDT Tue Jun 29 2021
NYZ043-VTZ013-291945-
Northern Washington-Bennington-
316 PM EDT Tue Jun 29 2021
...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL WASHINGTON
COUNTY...
At 316 PM EDT, a strong thunderstorm was located near Comstock, or 9
miles south of Whitehall, moving east at 25 mph.
Winds in excess of 30 mph are possible with this storm.
Locations impacted include...
Granville, Hartford, Comstock, Pawlet, Fort Ann, North Rupert, Middle
Granville, Slateville, North Granville, North Dorset, Slyboro,
Baldwin Corner, South Granville, Truthville, Raceville, West Pawlet
and West Granville.
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 4327 7300 4333 7332 4339 7353 4350 7352
4352 7325 4333 7325 4330 7300
TIME...MOT...LOC 1916Z 273DEG 22KT 4342 7337
JPVSpecial Weather Statement National Weather Service Albany NY 318 PM EDT Tue Jun 29 2021 NYZ040-047-048-051-291945- Schoharie-Western Schenectady-Montgomery-Western Albany- 318 PM EDT Tue Jun 29 2021 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN SCHENECTADY... NORTHWESTERN ALBANY...NORTHEASTERN SCHOHARIE AND SOUTH CENTRAL MONTGOMERY COUNTIES... At 318 PM EDT, a strong thunderstorm was located over Central Bridge, or 9 miles east of Cobleskill, moving east at 25 mph. Winds in excess of 30 mph are possible with this storm. Locations impacted include... Duanesburg, Berne, Schoharie, Delanson, Central Bridge, Knox, Princetown, Esperance, Duane, East Berne, Old Central Bridge, Rockwell Corners, West Berne, Grovenor Corners, Old Stone Fort, Quaker Street, Becker Corners, Burtonsville, Helderberg and Eaton Corners. This includes Interstate 88 between exits 22 and 24. 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 4267 7442 4281 7437 4282 7406 4257 7403 TIME...MOT...LOC 1918Z 279DEG 22KT 4271 7431 JPV
Special Weather Statement National Weather Service Albany NY 329 PM EDT Tue Jun 29 2021 NYZ043-292000- Northern Washington- 329 PM EDT Tue Jun 29 2021 ...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL WASHINGTON COUNTY... At 329 PM EDT, a strong thunderstorm was located near Granville, or 11 miles southeast of Whitehall, moving east at 15 mph. Winds in excess of 40 mph and half inch hail are possible with this storm. Locations impacted include... Granville, Truthville, Raceville, Middle Granville, West Pawlet, West Granville, North Granville, Slyboro and South Granville. 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. LAT...LON 4334 7325 4337 7343 4350 7340 4349 7325 TIME...MOT...LOC 1929Z 286DEG 12KT 4340 7333 JPV
Special Weather Statement
National Weather Service Albany NY
352 PM EDT Tue Jun 29 2021
VTZ013-292030-
Bennington-
352 PM EDT Tue Jun 29 2021
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN BENNINGTON
COUNTY...
At 352 PM EDT, a strong thunderstorm was located near Pawlet, or 10
miles northwest of Manchester, moving east at 15 mph.
Winds in excess of 40 mph are possible with this storm.
Locations impacted include...
Dorset, Rupert, North Rupert, East Rupert, Freedleyville, West
Rupert, Bromley Village, North Dorset, South Dorset and East Dorset.
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 4321 7293 4323 7325 4331 7324 4330 7299
4329 7299 4329 7298 4330 7297 4330 7290
TIME...MOT...LOC 1952Z 286DEG 12KT 4330 7317
JPVSpecial Weather Statement
National Weather Service Albany NY
418 PM EDT Tue Jun 29 2021
VTZ013-014-292100-
Western Windham-Bennington-
418 PM EDT Tue Jun 29 2021
...A STRONG THUNDERSTORM WILL AFFECT NORTHERN BENNINGTON AND
NORTHWESTERN WINDHAM COUNTIES...
At 418 PM EDT, a strong thunderstorm was located over Dorset, or near
Manchester, moving southeast at 20 mph.
Winds in excess of 40 mph and pea size hail are possible with this
storm.
Locations impacted include...
Londonderry, Manchester, Dorset, Manchester Center, Windham, Peru,
Stratton Valley, Beartown, Bondville, Peru Town Center, Stratton
Acres, Rawsonville, Intervale, Barnumville, Freedleyville,
Thompsonburg, Stratton Mountain, Bromley Village, South Dorset and
North Windham.
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 4306 7283 4318 7319 4331 7311 4330 7299
4329 7299 4329 7298 4330 7297 4330 7288
4329 7282 4325 7282 4322 7269
TIME...MOT...LOC 2018Z 296DEG 16KT 4324 7304
JPVSpecial Weather Statement National Weather Service Albany NY 420 PM EDT Tue Jun 29 2021 NYZ052>054-060-061-292100- Eastern Albany-Eastern Columbia-Western Rensselaer-Western Columbia-Eastern Rensselaer- 420 PM EDT Tue Jun 29 2021 ...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL COLUMBIA... SOUTHEASTERN ALBANY AND SOUTHWESTERN RENSSELAER COUNTIES... At 420 PM EDT, a strong thunderstorm was located over East Greenbush, moving southeast at 20 mph. Winds in excess of 30 mph are possible with this storm. Locations impacted include... East Greenbush, Rensselaer, Nassau, Stephentown, Castleton-On-Hudson, Selkirk, West Sand Lake, Coeymans, East Nassau, Brookview, Van Hoesen Station, West Stephentown, Jacks Corners, Beckers Corners, Millers Corners, Rayville, Riders Mills, South Schodack, Denault Corners and Shivers Corners. This includes the following highways... Interstate 90 between exits 10 and 6A. Interstate 87 between exits 21A and 22. Interstate 787 between exits 3 and 4. 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. LAT...LON 4250 7384 4267 7374 4259 7342 4238 7353 TIME...MOT...LOC 2020Z 296DEG 16KT 4256 7371 JPV
The Albany radar (KENX), 106 km away, was scanning. The volume nearest the first event began at 20:29 UTC.
2 thunderstorm wind. Local standard time, as filed.
A tree was downed at Main Street and Barnumville Road.
A tree was downed at Main Street and Beech Street.
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: 966302, 968346.