Flood in New Hampshire
Every flood event the National Weather Service has filed in New Hampshire, year by year, with the most significant episodes. Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
The most significant on the map
The most significant flood episodes in New Hampshire.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 551
- Deaths
- 2
- Injuries
- 0
- Damage
- $51 million
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flash Flood and Flood in New Hampshire, October 8 to 9, 2005A slow-moving cold front interacted with the remnants of Tammy, producing significant rainfall and flooding across southern New Hampshire.
- Flooding in New Hampshire, October 8 to 10, 2005The interaction between a cold frontal boundary and the remnants of Tropical Storm Tammy resulted in tremendous amount of rainfall throughout most of central and southern New Hampshire.
- Tornadoes and Flood in New Hampshire, July 24, 2008On July 24th a closed 500 mb low was digging over NY/PA and waves of surface low pressure were riding north along the associated surface front to the west of the forecast area. A strong 50kt low level jet was also riding northward ahead of the front.
- Debris Flow and Flooding in New Hampshire, October 29 to 30, 2012On Monday, October 29th, Hurricane Sandy (and its remnants) tracked northwest from well off the North Carolina coast to southeastern Pennsylvania, making landfall near the southern tip of New Jersey.
- Flood and Strong Wind in New Hampshire, March 14, 2010A stacked low pressure system (surface low and upper level low on top of each other) moved southeast of Nantucket, spreading rain across Southern New England. This resulted in widespread rainfall totals of three to six inches.
- Flooding and Coastal Flood in New Hampshire, December 23 to 25, 2022Beginning on December 22nd a powerful storm was developing over the Ohio River Valley. On December 23rd the center of the storm was deepening rapidly (974mb) as it lifted through the eastern Great Lakes.
- Flooding and Coastal Flood in New Hampshire, April 16 to 20, 2007Overview: An area of low pressure intensified rapidly as it moved slowly from the southeastern United States on the morning of Sunday, April 15th to near New York City by the morning of Monday, April 16th.
- Flooding in New Hampshire, August 28 to 29, 2011Heavy rain from Tropical Storm Irene caused widespread flooding on many main stem rivers across New Hampshire. Damage to roads and bridges was extreme with repair costs well over six million dollars.
- Flash Flood and Flooding in New Hampshire, May 29, 2012A warm front moved through southern New Hampshire early Tuesday morning, leaving the area in a very moist, warm, and unstable airmass. Tuesday afternoon a cold front began moving across western New York and approaching southern New Hampshire.
- Flooding in New Hampshire, August 28, 2011Heavy rain from Tropical Storm Irene caused widespread flooding of small rivers and streams across many counties in New Hampshire. Damage to roads and bridges was extreme with repair costs in the millions.
- Flooding in New Hampshire, February 25 to 27, 2010Strong coastal low pressure produced rainfall of 5 to 8 inches resulting in county wide flooding of small rivers and streams across numerous counties in New Hampshire. Road washouts were widespread with major damage occurring to roadways. Homes and businesses were also flooded.
- Flooding in New Hampshire, May 13 to 16, 2006Low pressure developed south of New England and remained nearly stationary from the 12th to the 15th resulting in over 12 inches of rain in some locations in a 72 hour period. Homes and businesses were damaged extensively. Many roads were washed out and impassable.
- Flash Flooding and Flooding in New Hampshire, December 18 to 21, 2023Low pressure began organizing in the Gulf of Mexico on the 16th, setting record low sea level pressures as it traversed the Southeast through the 17th.
- Flash Flooding and Flooding in New Hampshire, July 17 to 19, 2021During the evening of July 17th an area of low pressure slowly moved east along a stationary boundary that stretched from New York to Massachusetts.
- Flooding in New Hampshire, April 15 to 16, 2014High temperatures near 80 along with 1 to 2 inches of rain caused the remaining snowpack to quickly melt resulting in widespread flooding. Many roads were flooded and washed out.
- Flooding in New Hampshire, March 14 to 18, 2010Low pressure developed over the Carolinas on March 13 and moved northeast spreading heavy rain over New England. Rainfall amounts ranged from 4 to 9 inches in southeast New Hampshire which caused serious flooding.
- Flood in New Hampshire, May 13 to 15, 2006Heavy rainfall, most of it falling over a 100 hour period, caused widespread flooding across much of southern New Hampshire, where small streams and main stem rivers rose out of their banks.
- Flooding and Heavy Snow in New Hampshire, April 15 to 18, 2007An unusually strong and slow moving coastal storm for mid April tracked to western Long Island Sound, before weakening slowly and drifting offshore.
- Flash Flooding and Flood in New Hampshire, May 26 to 27, 2011A stationary front located through northern New Hampshire provided a focus for showers and thunderstorms to develop. Due to the slow movement of the storms rainfall rates were high resulting in flash flooding.
- Flooding in New Hampshire, April 3 to 4, 2005A low pressure system moving slowly northeast from through the Mid-Atlantic States spread rain into New Hampshire during the afternoon of April 2. Heavy rain continued through the 3rd as the storm continued to move slowly northeast.
- Flash Flooding and Flooding in New Hampshire, September 16 to 18, 1999A southeast flow of tropical moisture developed over New Hampshire late Wednesday, September 15 as Hurricane Floyd moved slowly northeastward along the East Coast of the United States.
- Flooding in New Hampshire, October 15 to 16, 2005Heavy rain fell over New Hampshire due to the rapid development of surface low pressure well to the southeast of New England. Rainfall amounts ranged from around 3 inches in southern New Hampshire up to 9.26 inches at Pinkham Notch.
- Flash Flood and Flooding in New Hampshire, September 6 to 7, 2008Tropical Storm Hanna made landfall near the North Carolina/South Carolina border at 320AM EDT September 6. Hanna then moved north/northeast across the Mid-Atlantic states and southern New England September 6 and 7.
- Flash Flooding and Flood in New Hampshire, August 22, 2009Hurricane Bill developed into a tropical depression over the eastern Atlantic on August 15, 2009. Bill then strengthened into a hurricane over the next week, passing well to the east of Nantucket, August 22-23.
- Flooding in New Hampshire, February 25 to 28, 2010Strong coastal low pressure resulted in 5 to 7 inches of rain and caused moderate flooding on the Suncook and Lamprey Rivers in southern New Hampshire. The Lamprey River at Newmarket remained in flood through the end of the month.
More
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 2026-09-24.