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Flood in Harrison County, Missouri
20 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
Harrison County, Missouri, has 20 flood events in the NCEI record since 1950, with at least one in 10 different years.
June is the busiest month, with 10 of the recorded events. The last 20 years account for 17 events against 3 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.2% of the 10,821 flood events recorded in Missouri; its 2.8 per 100 square miles compares with 15.7 statewide.
Compared with Missouri
| Measure | Harrison County | Missouri | US |
|---|---|---|---|
| Flood events since 1950 | 20 | 10,821 | 183,559 |
| Per 100 square miles | 2.8 | 15.7 | 5.2 |
| Per 10,000 residents | 24.5 | 17.5 | 5.5 |
| Deaths recorded | 0 | 159 | 2,961 |
| Busiest month | June | May | June |
By year
Seasonality
0Feb
0Mar
0Apr
0May
6Jun
10Jul
1Aug
1Sep
2Oct
0Nov
0Dec
0
Recorded events
All 20 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 24 Jun 2025 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 29 Sep 2019 | Flood | — | — | — | — | — | County |
| 28 Sep 2019 | Flood | — | — | — | — | — | County |
| 29 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 28 May 2019 | Flash Flood | — | — | — | — | — | County |
| 28 May 2019 | Flash Flood | — | — | — | — | — | County |
| 28 May 2019 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 9 Jun 2011 | Flood | — | — | — | — | — | County |
| 5 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2009 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2009 | Flash Flood | — | — | — | — | — | County |
| 15 May 2009 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2008 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2004 | Flash Flood | — | — | — | — | — | County |
| 30 May 2004 | Flash Flood | — | — | — | — | — | County |
| 14 May 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Harrison County had?
20 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Harrison County?
24 Jun 2025 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Harrison County?
NCEI records no damage estimate for events of this type in the county.
How does Harrison County compare with Missouri for flood?
2.8 events per 100 square miles against 15.7 statewide; the county holds 20 of the state's 10,821 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.