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Flood in Union County, Ohio
59 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.
Union County, Ohio, has 59 flood events in the NCEI record since 1950, with at least one in 22 different years.
June is the busiest month, with 21 of the recorded events. The last 20 years account for 39 events against 20 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.9% of the 6,794 flood events recorded in Ohio; its 13.7 per 100 square miles compares with 16.6 statewide.
Compared with Ohio
| Measure | Union County | Ohio | US |
|---|---|---|---|
| Flood events since 1950 | 59 | 6,794 | 183,559 |
| Per 100 square miles | 13.7 | 16.6 | 5.2 |
| Per 10,000 residents | 9.1 | 5.8 | 5.5 |
| Deaths recorded | 0 | 74 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
5Feb
0Mar
3Apr
1May
6Jun
21Jul
13Aug
1Sep
4Oct
0Nov
1Dec
4
Recorded events
All 59 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 |
|---|---|---|---|---|---|---|---|
| 5 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 5 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2023 | Flood | — | — | — | — | — | County |
| 17 Jul 2022 | Flood | — | — | — | — | — | County |
| 6 Jul 2022 | Flood | — | — | — | — | — | County |
| 10 Jun 2021 | Flood | — | — | — | — | — | County |
| 7 Sep 2020 | Flood | — | — | — | — | — | County |
| 28 Mar 2020 | Flood | — | — | — | — | — | County |
| 6 Jul 2019 | Flood | — | — | — | — | — | County |
| 19 Jun 2019 | Flood | — | — | — | — | — | County |
| 18 Jun 2019 | Flood | — | — | — | — | — | County |
| 17 May 2019 | Flood | — | — | — | — | — | County |
| 17 May 2019 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | $2K | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 May 2018 | Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flood | — | — | — | — | — | County |
| 23 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2017 | Flood | — | — | — | — | — | County |
| 13 Jun 2017 | Flood | — | $1K | — | — | — | County |
| 18 Jul 2016 | Flood | — | — | — | — | — | County |
| 17 Jun 2015 | Flood | — | — | — | — | — | County |
| 23 Dec 2013 | Flood | — | — | — | — | — | County |
| 22 Dec 2013 | Flood | — | — | — | — | — | County |
| 22 Dec 2013 | Flood | — | — | — | — | — | County |
| 22 Dec 2013 | Flood | — | — | — | — | — | County |
| 8 Aug 2013 | Flood | — | — | — | — | — | County |
| 22 Jul 2013 | Flash Flood | — | $1K | — | — | — | County |
| 22 Jul 2013 | Flash Flood | — | $1K | — | — | — | County |
| 22 Jul 2013 | Flash Flood | — | $1K | — | — | — | County |
| 22 Jul 2013 | Flash Flood | — | $1K | — | — | — | County |
| 22 Jul 2013 | Flash Flood | — | $1K | — | — | — | County |
| 4 Mar 2008 | Flood | — | $2K | — | — | — | County |
| 1 Mar 2007 | Flood | — | $3K | — | — | — | County |
| 23 Sep 2005 | Flood | — | — | — | — | — | Forecast zone |
| 11 Jan 2005 | Flood | — | $15K | — | — | — | Forecast zone |
| 5 Jan 2005 | Flood | — | $20K | — | — | — | Forecast zone |
| 15 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 13 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 21 May 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jan 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jan 2004 | Flood | — | — | — | — | — | Forecast zone |
| 13 Jun 2003 | Flood | — | — | — | — | — | Forecast zone |
| 9 May 2003 | Flood | — | — | — | — | — | Forecast zone |
| 27 Sep 2002 | Flood | — | — | — | — | — | Forecast zone |
| 19 Jul 2002 | Flood | — | — | — | — | — | Forecast zone |
| 19 Jul 2002 | Flood | — | — | — | — | — | Forecast zone |
| 23 Sep 2000 | Flash Flood | — | $10K | — | — | — | County |
| 8 Apr 2000 | Flash Flood | — | $3K | — | — | — | County |
| 1 Jul 1999 | Flash Flood | — | — | — | — | — | County |
| 21 Jan 1999 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 1998 | Flash Flood | — | $50K | — | — | — | County |
| 1 Jun 1997 | Flash Flood | — | $3.0M | — | — | — | County |
| 11 May 1996 | Flash Flood | — | $3K | — | — | — | County |
Questions and answers
How many flood events has Union County had?
59 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 Union County?
5 Jun 2024 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Union County?
The flash flood of 1 Jun 1997, with property damage estimated by NCEI at $3.0M.
How does Union County compare with Ohio for flood?
13.7 events per 100 square miles against 16.6 statewide; the county holds 59 of the state's 6,794 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.