A very moist air mass was in place on the 14th of July with dewpoint temperatures around 70 degrees. As a disturbance aloft moved toward New England, thunderstorms developed over western New Hampshire, with a few being severe.
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 very moist air mass was in place on the 14th of July with dewpoint temperatures around 70 degrees. As a disturbance aloft moved toward New England, thunderstorms developed over western New Hampshire, with a few being severe.
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 Jul 14, 1:46 PM EST, 51 minutes earlier.
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</html>Special Weather Statement
National Weather Service Gray ME
259 PM EDT Wed Jul 14 2021
NHZ003-005-007-141930-
Northern Grafton-Southern Grafton-Sullivan-
259 PM EDT Wed Jul 14 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN SULLIVAN AND
SOUTHWESTERN GRAFTON COUNTIES...
At 257 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Vershire to Woodstock. Movement was
east at 35 mph.
Winds in excess of 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
Lebanon, Grafton, Hanover, Enfield, Canaan, Groton, Woodstock,
Piermont, Grantham, Lyme, Cornish, Croydon, Benton, Dorchester,
Ellsworth, Wentworth, Plainfield, Rumney, Orange and Springfield.
This includes the following highways...
Interstate 89 between mile markers 37 and 60.
Interstate 93 between mile markers 92 and 98.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4354 7238 4357 7238 4360 7234 4370 7230
4377 7220 4381 7218 4386 7219 4387 7217
4389 7217 4392 7212 4394 7212 4397 7209
4397 7211 4400 7211 4400 7162 4342 7207
4348 7238 4352 7240
TIME...MOT...LOC 1857Z 278DEG 32KT 4393 7232 4359 7255
MSCSpecial Weather Statement
National Weather Service Gray ME
329 PM EDT Wed Jul 14 2021
NHZ003-005-007-142000-
Northern Grafton-Southern Grafton-Sullivan-
329 PM EDT Wed Jul 14 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN SULLIVAN
AND SOUTHERN GRAFTON COUNTIES...
At 328 PM EDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles east of Piermont to near Lebanon.
Movement was east at 30 mph.
Winds in excess of 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
Lebanon, Lincoln, Plymouth, Grafton, Hanover, Haverhill, Enfield,
Canaan, Danbury, Groton, Woodstock, Piermont, Grantham, Lyme, Hebron,
Benton, Dorchester, Ellsworth, Orange and Thornton.
This includes the following highways...
Interstate 89 between mile markers 44 and 60.
Interstate 93 between mile markers 87 and 100.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4359 7236 4360 7234 4364 7232 4374 7225
4375 7223 4377 7220 4379 7220 4381 7218
4384 7218 4402 7205 4405 7149 4360 7184
4361 7185 4348 7198 4356 7238
TIME...MOT...LOC 1928Z 274DEG 27KT 4396 7195 4357 7222
MSCThe Burlington radar (KCXX), 120 km away, was scanning. The volume nearest the first event began at 19:38 UTC.
4 thunderstorm wind, 1 hail. Local standard time, as filed.
Severe thunderstorm wind gusts downed trees at East Wilder boat launch.
Severe thunderstorm wind gusts downed a tree across Alden road in Lebanon.
Quarter size hail on highway 4 west of Canaan.
Severe thunderstorm wind gusts downed a tree and numerous large branches along highway 63 near Hinsdale.
Severe thunderstorm wind gusts downed two trees on State Route 10 partially blocking road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2021Every state in 2021This day in weather historyWarnings in New Hampshire, July 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 2026-10-01. Each event’s entry at NCEI: 976474, 976477, 976472, 976487, 976490.