Delaware County, New York: Natural Disaster Risk and History
Delaware County, New York has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 83.3 out of 100, higher than about 83% of US counties, with inland (river and flash) flooding, landslides and hurricanes scoring highest of its 18 hazards and $35 million a year in expected losses.
OpenFEMA lists 37 federal disaster declarations that included Delaware County since 1965, not counting 2 for COVID-19; the latest is DR-4825-NY (Remnants of Tropical Storm Debby, declared 24 September 2024). NOAA's Storm Prediction Center recorded 10 tornadoes touching Delaware County from 1950 to 2025.
Live weather alerts for New York All official warnings Latest FEMA declarations
Population 44,102 Buildings worth $16 billion Area 1,482 sq mi Risk rank in New York 21 of 62 FIPS 36025
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Inland flooding | Relatively Moderate | 91.2 | $31 million | about 2.3 a year | 64 |
| Landslide | Relatively Moderate | 90.0 | $40,064 | about 2.5 a year | — |
| Hurricane | Relatively Low | 76.8 | $901,556 | about once every 36 years | 10 |
| Winter weather | Relatively Moderate | 72.5 | $102,256 | about 2 a year | 379 |
| Cold wave | Relatively Moderate | 69.8 | $1.5 million | about 5 a year | 95 |
| Avalanche | Relatively Low | 69.3 | $2,860 | about once every 100 years | 0 |
| Tornado | Relatively Low | 55.6 | $1.1 million | about once every 2.6 years | 12 |
| Strong wind | Relatively Low | 51.8 | $409,587 | about 1.5 a year | 58 |
| Earthquake | Very Low | 50.4 | $198,704 | rarer than once in 1,000 years | — |
| Lightning | Relatively Low | 49.1 | $159,348 | about 29 a year | 121,979 strikes |
| Ice storm | Relatively Low | 42.3 | $41,891 | about once every 3.3 years | 21 |
| Hail | Relatively Low | 38.1 | $117,591 | about 2.6 a year | 98 |
| Heat wave | Very Low | 21.1 | $48,770 | about 1.1 a year | 21 |
| Wildfire | Very Low | 18.7 | $4,837 | rarer than once in 1,000 years | — |
| Drought | No Rating | 0.0 | — | — | 0 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 37
Most common: Severe Storm 15, Flood 7, Hurricane 5, Snowstorm 5.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Drought |
| 1970s | 2 | Flood ×2 |
| 1980s | 1 | Flood |
| 1990s | 5 | Severe Storm ×2, Snowstorm ×2, Flood |
| 2000s | 16 | Severe Storm ×10, Other ×2, Snowstorm ×2, Hurricane, Fire |
| 2010s | 10 | Flood ×3, Severe Storm ×3, Hurricane ×3, Snowstorm |
| 2020s | 2 | Tropical Storm, Hurricane |
The last 10
Widest declarations that included Delaware County
- Hurricane Sandy (2012, EM-3351-NY): 62 New York counties designated.
- Hurricane Katrina Evacuation (2005, EM-3262-NY): 62 New York counties designated.
- Severe Storms and Flooding (2004, DR-1534-NY): 62 New York counties designated.
Named storms in its declarations: Tropical Storm Debby (2024), Hurricane Henri (2021), Hurricane Sandy (2012), Tropical Storm Lee (2011), Hurricane Irene (2011), Hurricane Katrina (2005), Tropical Depression Ivan (2004).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. New York also had 7 statewide declarations with no county list.
Tornado record since 1950 10
| Tornadoes touching the county | 10 |
|---|---|
| Strongest-rated | (E)F3 ×1 |
| Peak month | May (3) |
| Deadliest | 31 May 1998, F3, 62 mi path, 0 killed, 12 injured |
| Longest path | 31 May 1998, F3, 62 mi path, 0 killed, 12 injured |
| Most recent | 12 Aug 2023, EF0, 3.7 mi path |
| Deaths / injuries on those paths | 0 / 12 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 4 | 4 | 1 | 1 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 0 | 0 | 1 | 5 | 1 | 1 | 2 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Delaware County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Delaware County (this page) | — | Relatively Moderate | 83.3 | Inland flooding |
| Otsego County | 49 km | Relatively Low | 75.8 | Inland flooding |
| Sullivan County | 56 km | Relatively Low | 78.3 | Inland flooding |
| Schoharie County | 61 km | Very Low | 41.3 | Landslide |
| Chenango County | 62 km | Relatively Low | 72.3 | Inland flooding |
| Wayne County, PA | 67 km | Relatively Low | 56.3 | Hurricane |
Nearest by distance between county centres. Every county in New York, ranked.
Vulnerability and resilience
| Social vulnerability | Very High 85.9 |
|---|---|
| Community resilience | Relatively High 63.2 |
| Community risk factor | 1.48 |
| Expected annual loss, all hazards | $35 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Delaware County's main hazards
- Right now: National Weather Service alerts for New York · all official warnings on Global Incident Tracker.
- Inland flooding: Flood safety: why shallow water kills · Floods recorded
- Landslide: Landslides recorded
- Hurricane: Is there a hurricane now? · Cyclone preparation
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Delaware County
What natural disasters is Delaware County, New York most at risk from?
Delaware County, New York has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 83.3 out of 100, higher than about 83% of US counties, with inland (river and flash) flooding, landslides and hurricanes scoring highest of its 18 hazards and $35 million a year in expected losses.
How many federal disaster declarations has Delaware County had?
OpenFEMA lists 37 federal disaster declarations that included Delaware County since 1965, not counting 2 for COVID-19; the latest is DR-4825-NY (Remnants of Tropical Storm Debby, declared 24 September 2024). Another 7 New York declarations were made statewide without a county list.
How many tornadoes have hit Delaware County?
NOAA's Storm Prediction Center recorded 10 tornadoes touching Delaware County from 1950 to 2025. The deadliest: 31 May 1998, F3, 62 mi path, 0 killed, 12 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.