Harmon County, Oklahoma: Natural Disaster Risk and History
Harmon County, Oklahoma has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 10.2 out of 100, higher than about 10% of US counties, with drought, hail and strong winds scoring highest of its 18 hazards and $3.3 million a year in expected losses.
OpenFEMA lists 18 federal disaster declarations that included Harmon County since 1995, not counting 2 for COVID-19; the latest is DR-4587-OK (Severe Winter Storms, declared 24 February 2021). NOAA's Storm Prediction Center recorded 33 tornadoes touching Harmon County from 1950 to 2025.
Live weather alerts for Oklahoma All official warnings Latest FEMA declarations
Population 2,486 Buildings worth $658 million Area 544 sq mi Risk rank in Oklahoma 76 of 77 FIPS 40057
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Drought | Relatively High | 92.0 | $1.3 million | about 14 a year | 3,549 |
| Hail | Relatively Low | 61.8 | $272,125 | about 8.1 a year | 307 |
| Strong wind | Relatively Moderate | 58.7 | $472,795 | about 3.6 a year | 136 |
| Wildfire | Very Low | 58.0 | $50,202 | about once every 465 years | — |
| Ice storm | Relatively Low | 57.3 | $79,750 | about once every 1.4 years | 49 |
| Tornado | Relatively Low | 33.7 | $426,361 | about once every 2.4 years | 15 |
| Winter weather | Relatively Low | 26.1 | $16,587 | about 7.3 a year | 138 |
| Heat wave | Very Low | 25.7 | $69,521 | about 10 a year | 144 |
| Landslide | Very Low | 21.5 | $91 | about once every 10 years | — |
| Cold wave | Very Low | 21.0 | $163,556 | about 1.4 a year | 26 |
| Earthquake | Very Low | 20.9 | $20,637 | rarer than once in 1,000 years | — |
| Hurricane | Very Low | 17.0 | $3,050 | about once every 174 years | 2 |
| Lightning | Very Low | 5.5 | $11,759 | about 49 a year | 34,074 strikes |
| Inland flooding | Very Low | 3.8 | $399,286 | about once every 5.6 years | 5 |
| 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 18
Most common: Severe Ice Storm 7, Severe Storm 7, Fire 2, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1990s | 2 | Severe Storm, Tornado |
| 2000s | 7 | Severe Ice Storm ×4, Severe Storm, Fire, Hurricane |
| 2010s | 7 | Severe Storm ×5, Fire, Severe Ice Storm |
| 2020s | 2 | Severe Ice Storm ×2 |
The last 10
Widest declarations that included Harmon County
- Severe Winter Storms (2021, DR-4587-OK): 77 Oklahoma counties designated.
- Severe Winter Storm (2021, EM-3555-OK): 77 Oklahoma counties designated.
- Severe Winter Storm (2011, EM-3316-OK): 77 Oklahoma counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Oklahoma also had 24 statewide declarations with no county list.
Tornado record since 1950 33
| Tornadoes touching the county | 33 |
|---|---|
| Strongest-rated | (E)F2 ×3 |
| Peak month | May (19) |
| Deadliest | 1 Jun 1955, F1, 11.8 mi path, 0 killed, 2 injured |
| Longest path | 6 May 1965, F2, 31.3 mi path, 0 killed, 2 injured |
| Most recent | 18 Nov 2024, EF1, 3.4 mi path |
| Deaths / injuries on those paths | 0 / 6 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 11 | 12 | 3 | 0 | 0 | 0 | 7 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 6 | 3 | 1 | 8 | 3 | 0 | 4 | 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 Harmon County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Harmon County (this page) | — | Very Low | 10.2 | Drought |
| Greer County | 34 km | Very Low | 17.1 | Drought |
| Childress County, TX | 41 km | Very Low | 19.6 | Drought |
| Jackson County | 43 km | Relatively Moderate | 86.0 | Strong wind |
| Collingsworth County, TX | 46 km | Very Low | 27.4 | Drought |
| Hardeman County, TX | 51 km | Very Low | 8.7 | Drought |
Nearest by distance between county centres. Every county in Oklahoma, ranked.
Vulnerability and resilience
| Social vulnerability | Very High 80.8 |
|---|---|
| Community resilience | Very Low 3.0 |
| Community risk factor | 1.55 |
| Expected annual loss, all hazards | $3.3 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 Harmon County's main hazards
- Right now: National Weather Service alerts for Oklahoma · all official warnings on Global Incident Tracker.
- Drought: Drought monitor for Oklahoma
- Hail: Weather alerts for Oklahoma
- 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 Harmon County
What natural disasters is Harmon County, Oklahoma most at risk from?
Harmon County, Oklahoma has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 10.2 out of 100, higher than about 10% of US counties, with drought, hail and strong winds scoring highest of its 18 hazards and $3.3 million a year in expected losses.
How many federal disaster declarations has Harmon County had?
OpenFEMA lists 18 federal disaster declarations that included Harmon County since 1995, not counting 2 for COVID-19; the latest is DR-4587-OK (Severe Winter Storms, declared 24 February 2021). Another 24 Oklahoma declarations were made statewide without a county list.
How many tornadoes have hit Harmon County?
NOAA's Storm Prediction Center recorded 33 tornadoes touching Harmon County from 1950 to 2025. The deadliest: 1 Jun 1955, F1, 11.8 mi path, 0 killed, 2 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.