Enter any address in Sullivan County, New Hampshire to see its FEMA flood zone
Flash flooding from heavy rainfall events is a primary flood concern in Sullivan County. Over the past 30 years, NOAA data indicates 34 flood events and 24 flash flood events, resulting in 2 reported fatalities. For example, on June 17, 2023, slow-moving low pressure over Vermont brought heavy rain to southwest New Hampshire, with localized areas receiving 3 or more inches of rain.
National Flood Insurance Program (NFIP) claims data shows that properties in Zone A have experienced the most claims, with an average payout of $28,685 and an average water depth of 9.1 feet. Properties in Zone X and Zone X_SHADED have also seen significant claims with substantial average payouts and water depths, including an average of 31.0 feet in Zone X_SHADED. Homeowners in Zone A, as well as those in Zones X and X_SHADED, should pay particular attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
37 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Sullivan County, New Hampshire has recorded 59 flood-related events since 1996 according to NOAA's Storm Events Database, including 24 flash floods and 34 river or area floods. The county has received 33 federal disaster declarations, 8 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1973–2024)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm And Flooding | Winter Storm | Apr 3, 2024 |
| Severe Storms And Flooding | Flood | Jul 9, 2023 |
| Severe Storm And Flooding | Flood | Jul 29, 2021 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storm And Flooding | Severe Storm | Oct 29, 2017 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 26, 2013 |
| Severe Winter Storm And Snowstorm | Severe Storm | Feb 8, 2013 |
| Hurricane Sandy | Hurricane | Oct 26, 2012 |
| Severe Storm | Severe Storm | Oct 29, 2011 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jun 17, 2023 | 0.00K |
| Flood | Jul 11, 2023 | 0.00K |
| Flood | Jul 10, 2023 | 0.00K |
| Flash Flood | Jul 10, 2023 | 0.00K |
| Flood | Jul 9, 2023 | 0.00K |
| Flash Flood | Sep 8, 2023 | 0.00K |
| Flash Flood | Aug 4, 2023 | 0.00K |
| Flood | Feb 23, 2022 | 0.00K |
| Flood | Feb 18, 2022 | 0.00K |
| Flash Flood | Jul 29, 2021 | 155.00K |
Flash Flood — Jun 17, 2023
A slow moving area of low pressure was centered over Southern Vermont on the morning of the 17th. Around mid-morning a band of heavy rain showers with embedded thunderstorms developed from Lebanon to Jaffrey. The band pivoted over the same region bringing nearly continuous moderate to periods of heavy rainfall through mid-afternoon. Most areas received 1 to 2.5 inches of rain across southwest N...
Flood — Jul 11, 2023
Saturday, July 8th through Monday, July 10th was an active weather period with numerous rounds of heavy rainfall moving across the state. Thunderstorms developed during the afternoon of Saturday, July 8th with scattered thunderstorms from the White Mountains down through the Monadnocks. Storms came to an end during the evening hours. Localized 3-hr rainfall totals ranged from 1 to 3���,...
Flood — Jul 10, 2023
Saturday, July 8th through Monday, July 10th was an active weather period with numerous rounds of heavy rainfall moving across the state. Thunderstorms developed during the afternoon of Saturday, July 8th with scattered thunderstorms from the White Mountains down through the Monadnocks. Storms came to an end during the evening hours. Localized 3-hr rainfall totals ranged from 1 to 3���,...
Flash Flood — Jul 10, 2023
Saturday, July 8th through Monday, July 10th was an active weather period with numerous rounds of heavy rainfall moving across the state. Thunderstorms developed during the afternoon of Saturday, July 8th with scattered thunderstorms from the White Mountains down through the Monadnocks. Storms came to an end during the evening hours. Localized 3-hr rainfall totals ranged from 1 to 3���,...
Flood — Jul 9, 2023
Saturday, July 8th through Monday, July 10th was an active weather period with numerous rounds of heavy rainfall moving across the state. Thunderstorms developed during the afternoon of Saturday, July 8th with scattered thunderstorms from the White Mountains down through the Monadnocks. Storms came to an end during the evening hours. Localized 3-hr rainfall totals ranged from 1 to 3���,...
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Sullivan County, New Hampshire:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Sullivan County, New Hampshire that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.