Clark County, Missouri

What hazards hit Clark County most?

The most frequent records are severe thunderstorm wind events: 135 since 1960. 62% of its severe thunderstorm wind events since 1960 fell in June and July. The rank column places the county among Missouri'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 Clark County had?

NOAA records 17 tornadoes in Clark County from 1973 to 2026, the strongest rated F3, with 2 deaths and 24 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 17 tornadoes whose track touched Clark County since 1950 (NOAA's county records number 17, the same count); along their whole tracks they killed 2 people.

Map of the strongest tornado tracks in Missouri.

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 Clark County?

The most recent record with damage, injuries or deaths is the June 17, 2026 tornado ($125,000 in damage in 2025 dollars).

A brief EF1 tornado uniquely tracked across three states. This developed just inside Lee County, Iowa, with peak winds of 105 mph, and tracked southeast through Clark County, Missouri. It then continued across the Mississippi River into Hancock County, Illinois, impacting northern parts of Warsaw. This tornado persisted for about 1.3 miles(0.9 miles in Missouri), doing damage largely to numerous trees, with concentrated snapping including along the banks of the Mississippi River, as shown by drone footage. There also was damage to two gas station canopies along US Highway 61 in Missouri.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1337533)

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 Clark 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).

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

What time of year?

62% of its severe thunderstorm wind events since 1960 fell in June and July. The two busiest months are in violet.

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

Federal disaster declarations for Clark County

FEMA's register lists 27 declarations that include Clark County: 18 major disasters, 9 emergencies and 0 fire management assistance declarations. Most were for severe storm (14) and flood (6).

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 Clark County had?

NOAA's Storm Events Database holds 87 flood or flash flood records for Clark County from 1996 to 2026, on 66 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Clark County ranks 1282nd of 2,942 U.S. counties.

The National Flood Insurance Program has paid $7.6 million on 106 claims filed in Clark County; the most in one year was 30 in 1993. 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 Clark County

FEMA's National Risk Index rates Clark County Very Low overall, with an expected annual loss of $6.7 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 Clark County

1. Lee County, IA 722
2. Hancock County, IL 710
3. Van Buren County, IA 515
4. Clark County 509
5. Scotland County 418
6. Lewis County 405
7. Knox County 282

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 MissouriEvery Missouri tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in MissouriThe state's severe thunderstorm wind events, by county, year and month
• The Missouri recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Clark CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Clark County's FEMA declarations (CSV)27 rows: every declaration that named the county, for your own analysis