New Hampshire, 2023

Flash Flooding in New Hampshire, June 25 to 26, 2023

June 25 to 26, 2023 · NWS GYX · 7 events in 3 counties and zones

On the evening of June 25, moderate to heavy rain occurred with rainfall rates briefly reaching up to 4 per hour. Numerous storms repeatedly traveled over the same area of Southern Grafton County through midnight before the rain ended shortly after.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
7

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.

What happened

The episode as NWS GYX wrote it up.

On the evening of June 25, moderate to heavy rain occurred with rainfall rates briefly reaching up to 4 per hour. Numerous storms repeatedly traveled over the same area of Southern Grafton County through midnight before the rain ended shortly after. After a short break in the rain activity from midnight through the morning of June 26, showers and thunderstorms began to redevelop across southern New Hampshire by midday. Rounds of heavy showers and thunderstorms moved through Hillsborough county through the afternoon hours with one storm impacting Manchester around 3 PM where 1.5 of rain fell in an hour. By early evening another round of heavy rain impacted the Wilton and Temple area with an additional 1 to 2 of rain in less than an hour. This region received heavy rainfall earlier in the afternoon, with this second round bringing rainfall totals of 3 or more inches to the area. During the evening, another round of heavy rain impacted western Cheshire County from 6 pm through 10 pm. The most impactful flooding occurred in the Bristol Community in Grafton County.

What forecasters said that day

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 25, 6:59 PM EST, 46 minutes earlier.

Area forecast discussion, Jun 25, 6:59 PM EST, 46 minutes before
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Hazardous weather outlook, Jun 25, 2:53 PM EST, 4 hours 52 minutes before
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The radar

The Portland,ME radar (KGYX), 127 km away, was scanning. The volume nearest the first event began at 00:46 UTC.

Open the radar archive at this moment

Event by event

7 flash flood. Local standard time, as filed.

Flash Flood, Grafton

When
June 25, 7:45 PM EST to 8:15 PM EST
Where
Grafton County, 0.64 mi NNE of Alexandria to 0.83 mi NNE of Alexandria
Cause
Heavy Rain
Reported by
Public
Coordinates
43.629, -71.797

Washout on Gale Road near Fowler Road intersection in Alexandria, when the Fowler River left its banks. Flooding on Berea Road in Hebron with flood damage to outbuildings.

Flash Flood, Grafton

When
June 25, 11:00 PM EST to June 26, 3:00 AM EST
Where
Grafton County, 2.26 mi S of Hebron to 2.47 mi WNW of Bridgewater
Cause
Heavy Rain
Reported by
Department of Highways
Coordinates
43.667, -71.796

Heavy downpours fell over the hilly terrain around Alexandria New Hampshire during the overnight hours of the 26th. The heaviest rain fell around Mt. Cardigan and surrounding hills with radar estimates between 3 and 5 inches. Heavy rainfall caused flooding of several small streams including Bailey, Clark, Brock, Patten, and Bog Brooks. Much of the flood damage was from overflow of the Patten and Bog Brooks. Significant washouts and closures occurred on Bailey Road, Burns Hill Road, Plummer Hill Road, Thissel Road, Bog Road, King Road, and Town Pound Road. In Alexandria shelters were open to house displaced residents as access was cut off for hundreds of residents.

Flash Flood, Grafton

When
June 25, 11:00 PM EST to June 26, 3:00 AM EST
Where
Grafton County, Bristol to 0.22 mi SSE of Bristol
Cause
Heavy Rain
Reported by
Department of Highways
Coordinates
43.600, -71.730

The Newfound River came out of its banks after 4 to 6 inches of rainfall in the early morning hours of the 26th. Pleasant Street in Bristol sustained a washout, with 4 feet of sand and gravel piled into intersection of Lake Street by floodwaters. Numerous roads washed out elsewhere in the community with culverts exposed and pavement collapsed, including Plummer Hill, Matthews Rd, Burns Hill, Foster Pond, and King Rd.

Flash Flood, Hillsborough

When
June 26, 2:30 PM EST to 3:00 PM EST
Where
Hillsborough County, 0.98 mi NNE of Manchester to 1.46 mi S of Manchester
Cause
Heavy Rain
Reported by
Department of Highways
Coordinates
42.993, -71.444

Multiple rounds of moderate to heavy rainfall overwhelmed Manchester storm drainage systems resulting in urban flooding. Flooding was reported on Green Street and Beech Street. Water up to car hoods. A report of water up to people’s knees on the intersection of Lake Avenue and Pine Street.

Flash Flood, Hillsborough

When
June 26, 4:28 PM EST to 5:30 PM EST
Where
Hillsborough County, New Ipswich to 1 mi NNE of Davis
Cause
Heavy Rain
Reported by
Department of Highways
Coordinates
42.750, -71.850

Flooding on NH Route 123 in Ipswich. Widespread flooding surrounding numerous businesses near Camden Court and Davis Village Road.

Flash Flood, Cheshire

When
June 26, 7:50 PM EST to 10:00 PM EST
Where
Cheshire County, 1.89 mi WNW of Chesterfield to 2.03 mi SE of West Chesterfield
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
42.888, -72.506

Heavy rain estimated between 3.5 to 5.5 inches fell between 7 and 930 pm across West Chesterfield, with rainfall rates measured over 3 inches per hour. This torrential rainfall resulted in flooding across sections of Main Street, Brook Street, Streeter Hill Road, and Gulf Road. Washouts were reported on Gulf Road.

Flash Flood, Cheshire

When
June 26, 9:00 PM EST to 10:00 PM EST
Where
Cheshire County, 1.11 mi SE of West Chesterfield to 1.47 mi SSE of West Chesterfield
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
42.907, -72.507

Pond Brook surged out of banks and onto Pond Brook Drive near Chamberlain Way.

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in New Hampshire in 2023Every state in 2023This day in weather historyWarnings in New Hampshire, June 2023

Sources

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: 1112601, 1108943, 1108944, 1108951, 1108952, 1109481, 1109482.