Allegany County, New York: Natural Disaster Risk and History
Allegany County, New York has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 69.8 out of 100, higher than about 69% of US counties, with inland (river and flash) flooding, landslides and strong winds scoring highest of its 18 hazards and $27 million a year in expected losses.
OpenFEMA lists 23 federal disaster declarations that included Allegany County since 1967, 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 12 tornadoes touching Allegany County from 1950 to 2025.
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Population 46,450 Buildings worth $11 billion Area 1,045 sq mi Risk rank in New York 32 of 62 FIPS 36003
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 | 84.6 | $24 million | about 1.6 a year | 45 |
| Landslide | Relatively Low | 73.4 | $7,708 | about once every 1.1 years | — |
| Strong wind | Relatively Moderate | 67.1 | $840,777 | about 1.8 a year | 70 |
| Hurricane | Relatively Low | 64.1 | $302,721 | about once every 42 years | 8 |
| Lightning | Relatively Moderate | 61.2 | $329,824 | about 31 a year | 96,308 strikes |
| Tornado | Relatively Low | 41.5 | $863,636 | about once every 5.4 years | 11 |
| Cold wave | Relatively Low | 41.0 | $644,916 | about 4.1 a year | 77 |
| Ice storm | Relatively Low | 34.7 | $38,600 | about once every 2.8 years | 24 |
| Winter weather | Relatively Low | 31.5 | $30,126 | about 2 a year | 383 |
| Earthquake | Very Low | 27.0 | $52,039 | rarer than once in 1,000 years | — |
| Avalanche | Very Low | 26.5 | $72 | about once every 100 years | 0 |
| Hail | Very Low | 22.9 | $79,017 | about 1.1 a year | 43 |
| Drought | Very Low | 19.9 | $3,660 | about once every 3.0 years | 28 |
| Wildfire | Very Low | 19.7 | $6,982 | rarer than once in 1,000 years | — |
| Heat wave | Very Low | 14.5 | $31,810 | about once every 1.5 years | 15 |
| 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 23
Most common: Severe Storm 7, Flood 7, Hurricane 3, Other 2.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Flood |
| 1970s | 2 | Flood ×2 |
| 1980s | 1 | Flood |
| 1990s | 4 | Snowstorm ×2, Severe Storm, Flood |
| 2000s | 9 | Severe Storm ×5, Other ×2, Hurricane, Fire |
| 2010s | 4 | Flood ×2, Severe Storm, Hurricane |
| 2020s | 2 | Tropical Storm, Hurricane |
The last 10
Widest declarations that included Allegany 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), Tropical Storm Fred (2021), Hurricane Sandy (2012), Hurricane Katrina (2005), Tropical Storm Agnes (1972).
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 12
| Tornadoes touching the county | 12 |
|---|---|
| Strongest-rated | (E)F3 ×1 |
| Peak month | July (4) |
| Deadliest | — |
| Longest path | 20 Jun 1969, F3, 84.1 mi path |
| Most recent | 6 Sep 2024, EF1, 6 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 4 | 5 | 2 | 1 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 1 | 0 | 0 | 3 | 4 | 3 | 1 |
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 Allegany County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Allegany County (this page) | — | Relatively Low | 69.8 | Inland flooding |
| Wyoming County | 52 km | Very Low | 41.3 | Inland flooding |
| Steuben County | 53 km | Relatively Low | 76.9 | Inland flooding |
| Cattaraugus County | 54 km | Relatively Moderate | 81.6 | Inland flooding |
| Livingston County | 56 km | Relatively Low | 56.4 | Inland flooding |
| Potter County, PA | 58 km | Very Low | 28.1 | Landslide |
Nearest by distance between county centres. Every county in New York, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Moderate 47.6 |
|---|---|
| Community resilience | Relatively High 72.2 |
| Community risk factor | 1.10 |
| Expected annual loss, all hazards | $27 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 Allegany 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
- Strong wind: Power outages now
- 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 Allegany County
What natural disasters is Allegany County, New York most at risk from?
Allegany County, New York has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 69.8 out of 100, higher than about 69% of US counties, with inland (river and flash) flooding, landslides and strong winds scoring highest of its 18 hazards and $27 million a year in expected losses.
How many federal disaster declarations has Allegany County had?
OpenFEMA lists 23 federal disaster declarations that included Allegany County since 1967, 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 Allegany County?
NOAA's Storm Prediction Center recorded 12 tornadoes touching Allegany County from 1950 to 2025.
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.