A supercell thunderstorm developed across southwest New Hampshire on the afternoon of June 23rd. The storm moved east to west across the entire state of New Hampshire before weakening near the Maine border.
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 GYX wrote it up.
A supercell thunderstorm developed across southwest New Hampshire on the afternoon of June 23rd. The storm moved east to west across the entire state of New Hampshire before weakening near the Maine border. The storm brought concentrated areas of wind damage, large hail, and a brief tornado touchdown in Dublin, NH. In addition, other strong thunderstorms formed north of the supercell across Central New Hampshire.
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 Gray, ME wrote its last area forecast discussion before the first event at Jun 23, 2:48 PM EST, 17 minutes earlier.
Area Forecast Discussion
National Weather Service Gray ME
348 PM EDT Sun Jun 23 2024
.SYNOPSIS...
A strong cold front will bring scattered severe storms to the
region this evening before pushing offshore tonight. Showers
will develop Monday with an upper level low overhead. High
pressure then settles in for Tuesday before another cold front
moves in for Wednesday night. Best chances for rain and
thunderstorms will be late Wednesdays, but this should clear out
Thursday as high pressure returns for the end of the week.
Temperatures and humidity will swing with the passing of each
frontal boundary.
&&
.NEAR TERM /UNTIL 10 PM THIS EVENING/...
Likely to see a couple rounds of convection this afternoon into
early evening, with the first one approaching the CT vly attm.
There are a few damage reports to our W, and we continue to
break out from the marine lyr from W to E as well, so there’s
still some time, but 18Z ALY sounding showing a bit of weak
capping layer. So, too early to say anything about reducing the
threat, and certainly some strong winds are possible into early
evening as well as heavy rain.
I think by 02-03Z should see the convection begin to move out of
the CWA or weaken, with showers coming to an end between then
and daybreak. Probably the early to mid evening will be the best
potential for heavy rain as there might be some training of
storms. It unlikely we see much, if any of the drier air mix
down to the sfc, and this will make for a mild and humid night,
with the potential for fog, Lows will mostly be in the 60s,
warmest in SW ME and srn NH where it’ll mostly be in the upper
60s.
&&
.SHORT TERM /10 PM THIS EVENING THROUGH 6 PM MONDAY/...
500 MB low will cross the CWA on Monday, and this will keep the
mtns cloudy, with some showers and thunderstorms developing
there, and perhaps moving SE toward srn NH and the coast by mid
to late afternoon. Highs range from 70-75 in the mtns to around
in srn NH and along the ME coast, as flow shifts more to the W.
It will start off humid, but should see Tds drop down into the
low 60s across much of the area by afternoon.
&&
.LONG TERM /MONDAY NIGHT THROUGH SUNDAY/...
The upper level trough will lift out of the region to be replaced
by brief ridging. This will produce warm conditions and bring a
reprieve in the shower activity. Return flow Tuesday night will
usher in warmer and more humid conditions for Wednesdays, with
highs in the mid to upper 80s for much of the area. A cold front
sinking south out of the Great Lakes on Wednesday will support
scattered to numerous showers and thunderstorms into Wednesday
night. The forcing with the system Wednesday night is
concerning, but for now the instability ahead of it could
will be a limiting factor. Will have to watch for heavy rain
producers as well as some concern about strong winds, but these
will be conditional and timing dependent so confidence is low
at this time. The front will bring a brief cool down for the
latter part of the work week. The airmass starts to modify with
surface high moving in Friday. Dew points in the 50s will mean
very tolerable humidity levels for late June. Another frontal
system approaches from the Great Lakes over the weekend,
bringing another opportunity for showers.
&&
.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
Short Term...TAFs still a struggle today, and will be into
tonight, as we are seeing some terminals improving quickly to
VFR, but should see all but KAUG/KRKD see VFR for a little while
late this afternoon into part of the evening, that is, outside
of TSRA that will be moving thru. I think, given the higher Tds,
and the light flow overnight, will see some fog, and IFR cigs at
most spots. VFR is expected to return Monday morning.
Long Term...Predominantly VFR conditions are then expected
Tuesday and early Wednesday, followed by another increased risk
of TSRA by Wednesday afternoon into Thursday.
&&
.MARINE...
Short Term...SCA for tonight, as S-SW flow ahead of a cold front
persists. Winds expected to diminish by Monday morning.
Long Term...
- Increased thunderstorm risk Wednesday Night
- Brief elevated winds and seas mid-week
A potent cold front will move through the waters Wednesday Night or
early Thursday and will feature an increased risk of thunderstorms.
Ahead of the front, elevated winds and seas will linger, with SCA
conditions possible. Southerly flow then quickly returns by
Wednesday and Thursday, with subsiding seas for late week.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...Small Craft Advisory from 5 PM this afternoon to 8 PM EDT
Monday for ANZ150>152-154.
&&
NEAR TERM...Cempa
SHORT TERM...Cempa
LONG TERM...JamisonHazardous Weather Outlook National Weather Service Gray ME 324 AM EDT Sun Jun 23 2024 MEZ007-008-012-013-018-019-023-024-033-NHZ001>015-240730- Northern Oxford-Northern Franklin-Southern Oxford-Southern Franklin- Interior York-Central Interior Cumberland-Coastal York- Coastal Cumberland-Interior Cumberland Highlands-Northern Coos- Southern Coos-Northern Grafton-Northern Carroll-Southern Grafton- Southern Carroll-Sullivan-Merrimack-Belknap-Strafford-Cheshire- Eastern Hillsborough-Interior Rockingham-Coastal Rockingham- Western And Central Hillsborough- 324 AM EDT Sun Jun 23 2024 This Hazardous Weather Outlook is for Maine, southwest Maine, western Maine, New Hampshire, central New Hampshire, northern New Hampshire and southern New Hampshire. .DAY ONE...Today and tonight. Severe thunderstorms are possible this afternoon and early evening, with the best chance being in New Hampshire. Damaging winds will be the main threat. However, a few tornadoes will be possible as well. Heavy rainfall rates may also result in a low chance for localized flash flooding concerns. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is expected later today. MEZ009-014-020>022-025>028-240730- Central Somerset-Southern Somerset-Androscoggin-Kennebec- Interior Waldo-Sagadahoc-Lincoln-Knox-Coastal Waldo- 324 AM EDT Sun Jun 23 2024 This Hazardous Weather Outlook is for south central Maine, southwest Maine and west central Maine. .DAY ONE...Today and tonight. Isolated strong to severe thunderstorms are possible late this afternoon and early evening, with damaging winds being the primary concern. .DAYS TWO THROUGH SEVEN...Monday through Saturday. A few strong thunderstorms will be possible Monday afternoon with small hail and gusty winds possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is expected later today. ANZ150>154-240730- Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM- Penobscot Bay- Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM- Casco Bay- Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM- 324 AM EDT Sun Jun 23 2024 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Today and tonight. A few strong thunderstorms will be possible late this afternoon or evening with gusts in excess of 40 knots possible. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
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</html>Special Weather Statement
National Weather Service Gray ME
402 PM EDT Sun Jun 23 2024
NHZ001-002-232030-
Northern Coos NH-Southern Coos NH-
402 PM EDT Sun Jun 23 2024
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL COOS COUNTY THROUGH
430 PM EDT...
At 401 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Stratford, or 10 miles northeast of Lancaster,
moving east at 50 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Berlin, Lancaster, Errol, Stratford, Dummer, Milan, Northumberland,
Stark, and Wentworth Location.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Tornado Watch remains in effect until 800 PM EDT for northern New
Hampshire.
&&
LAT...LON 4457 7159 4456 7156 4459 7154 4460 7156
4464 7156 4466 7158 4468 7159 4487 7106
4453 7103 4450 7158 4452 7159 4453 7158
4454 7158 4456 7160
TIME...MOT...LOC 2001Z 253DEG 43KT 4461 7145
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
ARNOTTThe Burlington radar (KCXX), 151 km away, was scanning. The volume nearest the first event began at 20:05 UTC.
12 thunderstorm wind, 4 hail, 1 tornado. Local standard time, as filed.
Severe thunderstorm outflow winds downed a tree blocking NH Route 12 in Charleston, NH.
Severe thunderstorm outflow winds downed trees on Plains Rd. in West Claremont.
A severe thunderstorm dropped hail the size of ping balls in Chesterfield, NH.
Severe thunderstorm outflow winds downed numerous trees throughout Keene, NH.
A severe thunderstorm dropped hail the size of half dollars south of Keene, NH.
Severe thunderstorm outflow winds downed trees and powerlines blocking NH-114 in Sutton, NH.
NWS storm survey confirmed an EF1 Tornado with a maximum wind speed of 90 mph occurred in Dublin, NH. The National Weather Service survey team identified|dozens of snapped white pine trees with uprooted maples and oaks also noted. While no significant structural damage was observed, some shingle damage to a roof was observed as well as a truck being briefly lifted and moved along the ground.
Severe thunderstorm outflow winds downed a tree blocking Shaker Rd. in Canterbury, NH.
Severe thunderstorm outflow winds downed trees on the shoulder of US HWY 202 on the north end of Peterborough, NH.
Severe thunderstorm outflow winds downed numerous trees in New Boston, NH.
Severe thunderstorm outflow winds downed trees and powerlines on Boynton St. in Bedford, NH.
Severe thunderstorm outflow winds downed trees on Gregg Mill Rd, Bryan Rd, and River Rd. in Goffstown.
Severe thunderstorm outflow winds downed trees and wires in Epping, NH.
A supercell severe thunderstorm dropped hail the size of golf balls on RT. 101 in Epping.
A wet microburst from a collapsing supercell blew down a significant number of trees causing close to a hundred snapped trees in Durham, NH. Significant power outages also occurred in this area.
A supercell thunderstorm dropped hail the size of golf balls on Portsmouth Ave. in Greenland.
Severe thunderstorm outflow winds downed numerous trees south of Berlin, NH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2024Every state in 2024This day in weather historyThe tornado archive for New Hampshire, 2024Warnings in New Hampshire, June 2024
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 2026-10-01. Each event’s entry at NCEI: 1192864, 1192863, 1192867, 1192870, 1192868, 1192865, 1178544, 1192866, 1192871, 1192872, 1192874, 1192875, 1192880, 1192877, 1192929, 1192879, 1192862.