Miami County, Ohio: Natural Disaster Risk and History
Miami County, Ohio has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 61.4 out of 100, higher than about 61% of US counties, with earthquakes, ice storms and strong winds scoring highest of its 18 hazards and $29 million a year in expected losses.
OpenFEMA lists 13 federal disaster declarations that included Miami County since 1977, not counting 2 for COVID-19; the latest is DR-4777-OH (Tornadoes, declared 2 May 2024). NOAA's Storm Prediction Center recorded 35 tornadoes touching Miami County from 1950 to 2025.
Live weather alerts for Ohio All official warnings Latest FEMA declarations
Population 108,774 Buildings worth $27 billion Area 414 sq mi Risk rank in Ohio 38 of 88 FIPS 39109
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Earthquake | Relatively Low | 80.4 | $2.2 million | about once every 513 years | — |
| Ice storm | Relatively Moderate | 78.0 | $455,960 | about once a year | 69 |
| Strong wind | Relatively Moderate | 76.0 | $1.5 million | about 2.6 a year | 98 |
| Tornado | Relatively Moderate | 75.4 | $4.1 million | about once every 3.6 years | 33 |
| Lightning | Relatively Moderate | 72.6 | $710,155 | about 46 a year | 138,978 strikes |
| Inland flooding | Relatively Low | 70.1 | $17 million | about 1.6 a year | 44 |
| Hail | Relatively Low | 68.6 | $684,421 | about 3.4 a year | 130 |
| Winter weather | Relatively Moderate | 65.6 | $143,737 | about 12 a year | 227 |
| Cold wave | Relatively Low | 57.2 | $1.6 million | about 4.7 a year | 90 |
| Landslide | Very Low | 42.6 | $1,037 | about once every 12 years | — |
| Heat wave | Relatively Low | 41.7 | $323,392 | about 4.1 a year | 65 |
| Hurricane | Very Low | 33.5 | $24,290 | about once every 131 years | 4 |
| Drought | Relatively Low | 32.3 | $42,076 | about once every 4.5 years | 14 |
| Wildfire | Very Low | 21.0 | $10,524 | rarer than once in 1,000 years | — |
| Avalanche | Not Applicable | — | — | — | — |
| 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 13
Most common: Severe Storm 7, Snowstorm 3, Tornado 2, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 2 | Snowstorm ×2 |
| 1990s | 1 | Severe Storm |
| 2000s | 6 | Severe Storm ×4, Hurricane, Snowstorm |
| 2010s | 3 | Severe Storm ×2, Tornado |
| 2020s | 1 | Tornado |
The last 10
Widest declarations that included Miami County
- Severe Storms (2012, EM-3346-OH): 88 Ohio counties designated.
- Hurricane Katrina Evacuation (2005, EM-3250-OH): 88 Ohio counties designated.
- Severe Storms and Flooding (2004, DR-1556-OH): 88 Ohio counties designated.
Named storms in its declarations: Tropical Depression Ike (2008), Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Ohio also had 3 statewide declarations with no county list.
Tornado record since 1950 35
| Tornadoes touching the county | 35 |
|---|---|
| Strongest-rated | (E)F3 ×1 |
| Peak month | May (11) |
| Deadliest | 1 Mar 1955, F1, 0.5 mi path, 0 killed, 1 injured |
| Longest path | 2 Jul 1978, F0, 27.5 mi path |
| Most recent | 11 Jun 2023, EF0, 0.6 mi path |
| Deaths / injuries on those paths | 0 / 3 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 18 | 12 | 4 | 1 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 2 | 2 | 1 | 5 | 5 | 2 | 10 | 8 |
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 Miami County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Miami County (this page) | — | Relatively Low | 61.4 | Earthquake |
| Shelby County | 31 km | Relatively Low | 56.2 | Earthquake |
| Montgomery County | 34 km | Relatively Moderate | 92.7 | Strong wind |
| Darke County | 34 km | Relatively Low | 52.7 | Tornado |
| Champaign County | 40 km | Very Low | 26.7 | Ice storm |
| Clark County | 41 km | Relatively Low | 77.1 | Ice storm |
Nearest by distance between county centres. Every county in Ohio, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 12.8 |
|---|---|
| Community resilience | Very High 88.5 |
| Community risk factor | 0.80 |
| Expected annual loss, all hazards | $29 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 Miami County's main hazards
- Right now: National Weather Service alerts for Ohio · all official warnings on Global Incident Tracker.
- Earthquake: Earthquakes today · Earthquake safety guide
- Ice storm: Power outages now · Carbon monoxide in winter
- 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 Miami County
What natural disasters is Miami County, Ohio most at risk from?
Miami County, Ohio has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 61.4 out of 100, higher than about 61% of US counties, with earthquakes, ice storms and strong winds scoring highest of its 18 hazards and $29 million a year in expected losses.
How many federal disaster declarations has Miami County had?
OpenFEMA lists 13 federal disaster declarations that included Miami County since 1977, not counting 2 for COVID-19; the latest is DR-4777-OH (Tornadoes, declared 2 May 2024). Another 3 Ohio declarations were made statewide without a county list.
How many tornadoes have hit Miami County?
NOAA's Storm Prediction Center recorded 35 tornadoes touching Miami County from 1950 to 2025. The deadliest: 1 Mar 1955, F1, 0.5 mi path, 0 killed, 1 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.