Washington County, Oklahoma

What hazards hit Washington County most?

The most frequent records are hail reports: 285 since 1957. 59% of its hail reports since 1957 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 Washington County had?

NOAA records 35 tornadoes in Washington County from 1953 to 2024, the strongest rated F3, with 1 death and 73 injuries recorded in the county. That is 16th of 77 Oklahoma counties and 165th of 3,080 U.S. counties by days with tornadoes per 1,000 square miles since 1950. 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 38 tornadoes whose track touched Washington County since 1950 (NOAA's county records number 35: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 3 people, 1 of them in Washington County.

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 Washington County?

The most recent record with damage, injuries or deaths is the April 28, 2026 hail ($30,000 in damage in 2025 dollars).

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 Washington 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: 36 records against 10 in the decade before, 36 of them forecast-zone records. Heat in the 2010s: 24 records against 7 in the decade before, 24 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 Washington 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?

59% of its hail reports since 1957 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 Washington County

FEMA's register lists 33 declarations that include Washington County: 21 major disasters, 9 emergencies and 3 fire management assistance declarations. Most were for severe storm (10) and severe ice storm (9).

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 Washington County had?

NOAA's Storm Events Database holds 52 flood or flash flood records for Washington County from 1996 to 2020, on 35 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Washington County ranks 639th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $8.5 million on 372 claims filed in Washington County; the most in one year was 101 in 1986. 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 Washington County

FEMA's National Risk Index rates Washington County Relatively Low overall, with an expected annual loss of $31.8 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 Washington County

1. Tulsa County 2,681
2. Osage County 1,740
3. Rogers County 1,145
4. Montgomery County, KS 927
5. Washington County 840
6. Nowata County 649
7. Chautauqua County, KS 591

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 Washington CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Washington County's FEMA declarations (CSV)33 rows: every declaration that named the county, for your own analysis