Harmon County, Oklahoma

What hazards hit Harmon County most?

The most frequent records are hail reports: 286 since 1960. 67% of its hail reports since 1960 fell in April and May. The rank column places the county among Oklahoma's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Harmon County had?

NOAA records 38 tornadoes in Harmon County from 1952 to 2024, the strongest rated F2, with 0 deaths and 6 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 36 tornadoes whose track touched Harmon County since 1950 (NOAA's county records number 38: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in Oklahoma.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Harmon County?

The most recent record with damage, injuries or deaths is the November 18, 2024 tornado ($14,000 in damage in 2025 dollars).

This tornado began south of Gould, along or just west of State Highway 5 and north of E1660 Road. The tornado moved to the north and then northwest, before dissipating just to the west of the city of Gould. Numerous power poles were snapped and broken along E1650 road, while several central pivot irrigation units sustained damage.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1221992)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Harmon County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Drought in the 2010s: 67 records against 16 in the decade before, 67 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Harmon County days with a record above.

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

67% of its hail reports since 1960 fell in April and May. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Harmon County

FEMA's register lists 20 declarations that include Harmon County: 13 major disasters, 7 emergencies and 0 fire management assistance declarations. Most were for severe ice storm (7) and severe storm (7).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Harmon County had?

NOAA's Storm Events Database holds 5 flood or flash flood records for Harmon County from 2003 to 2016, on 5 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Harmon County ranks 1960th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $195,000 on 27 claims filed in Harmon County; the most in one year was 5 in 1987. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Harmon County

FEMA's National Risk Index rates Harmon County Very Low overall, with an expected annual loss of $3.3 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Harmon County

1. Jackson County 1,457
2. Beckham County 1,138
3. Greer County 844
4. Harmon County 798
5. Childress County, TX 687
6. Hardeman County, TX 686
7. Collingsworth County, TX 592

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in OklahomaEvery Oklahoma tornado since 1950 and the counties with the most per square mile
• Hail in OklahomaThe state's hail reports, by county, year and month
• The Oklahoma recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Harmon CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Harmon County's FEMA declarations (CSV)20 rows: every declaration that named the county, for your own analysis