An anomalously warm and humid airmass was in place across the state of New Hampshire on September 7th with high temperatures well into the 80s along with surface moisture. This allowed for high instability values to develop through the day.
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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.
An anomalously warm and humid airmass was in place across the state of New Hampshire on September 7th with high temperatures well into the 80s along with surface moisture. This allowed for high instability values to develop through the day. A weak frontal boundary began to approach Western new Hampshire by the evening where a few lines of thunderstorms developed and slowly moved into the Connecticut River Valley. A few isolated storms became severe with large hail and damaging winds, but overall the damage was sporadic and mostly confided near the Vermont border near the Connecticut River Valley.
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 Sep 7, 3:03 PM EST, 1 hour 32 minutes earlier.
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</html>The Burlington radar (KCXX), 152 km away, was scanning. The volume nearest the first event began at 21:32 UTC.
3 hail, 2 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm dropped hail the size of quarters in Pittsburg New Hampshire.
A severe thunderstorm dropped hail the size of quarters in the Clarksville Area on Old Canaan Rd in Pittsburg, New Hampshire.
A severe thunderstorm dropped hail the size of half dollars in Claremont, New Hampshire.
Severe thunderstorm outflow wind gusts downed numerous trees across Haverhill, New Hampshire.
Severe thunderstorm outflow wind gusts downed a tree on Route 49 and another tree fell on the roof an out building at a local school in Campton, New Hampshire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2023Every state in 2023This day in weather historyWarnings in New Hampshire, September 2023
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: 1142613, 1142616, 1142617, 1142620, 1142618.