A very strong shortwave and associated cold front were approaching from the west on the morning of July 1st. Ahead of the front, a very warm and moist air mass was in place over New England with values of precipitable water around 2 inches.
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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.
A very strong shortwave and associated cold front were approaching from the west on the morning of July 1st. Ahead of the front, a very warm and moist air mass was in place over New England with values of precipitable water around 2 inches. Strong directional and speed shear contributed to numerous super cells that produced damaging winds. In addition, very heavy rain associated with these cells produced extensive flash flooding to many area roads with damage totaling in the millions.
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 30, 10:02 PM EST, 2 hours 17 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Thunderstorms produced 3 to 5 inches of rain causing flooding on the Pemigewassett River at Plymouth (flood stage 13 ft), which crested at 16.62 ft. Route 175A was flooded.
Thunderstorms produced 3 to 5 inches of rain causing flooding on the Pemigewassett River at Woodstock (flood stage 9.00 ft), which crested at 11.14 feet. Route 175 at Cox Farm Road flooded. Two campgrounds were also flooded.
Thunderstorms produced 3 to 5 inches of rain causing flooding on the Baker River at Rumney (flood stage 10.00 ft), which crested at 11.05 ft. Several campgrounds were flooded.
Thunderstorm produced 3 to 5 inches of rain caused flooding on the Saco River at Conway (flood stage 9.0 ft) which crested at 9.9 ft. Several campgrounds flooded, as well as the Transvale Acres neighborhood in Conway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2017Every state in 2017This day in weather historyWarnings in New Hampshire, July 2017
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: 715668, 715669, 715670, 715672.