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Flood in Thomas County, Kansas
37 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.
Thomas County, Kansas, has 37 flood events in the NCEI record since 1950, with at least one in 13 different years.
May is the busiest month, with 9 of the recorded events. The last 20 years account for 30 events against 7 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.8% of the 4,604 flood events recorded in Kansas; its 3.4 per 100 square miles compares with 5.6 statewide.
Compared with Kansas
| Measure | Thomas County | Kansas | US |
|---|---|---|---|
| Flood events since 1950 | 37 | 4,604 | 183,559 |
| Per 100 square miles | 3.4 | 5.6 | 5.2 |
| Per 10,000 residents | 47.0 | 15.7 | 5.5 |
| Deaths recorded | 0 | 32 | 2,961 |
| Busiest month | May | May | June |
By year
Seasonality
0Feb
0Mar
4Apr
1May
9Jun
6Jul
6Aug
9Sep
2Oct
0Nov
0Dec
0
Recorded events
All 37 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 |
|---|---|---|---|---|---|---|---|
| 20 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 2025 | Flood | — | — | — | — | — | County |
| 31 May 2024 | Flood | — | — | — | — | — | County |
| 30 Jun 2023 | Flash Flood | — | — | — | — | — | County |
| 25 May 2023 | Flash Flood | — | $500 | $10 | — | — | County |
| 10 May 2023 | Flash Flood | — | $5K | $1K | — | — | County |
| 23 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 13 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 11 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 8 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 8 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 8 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2019 | Flash Flood | — | $1K | $1K | — | — | County |
| 8 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 26 May 2019 | Flash Flood | — | — | — | — | — | County |
| 26 May 2019 | Flash Flood | — | — | — | — | — | County |
| 26 May 2019 | Flash Flood | — | — | — | — | — | County |
| 26 May 2019 | Flash Flood | — | — | — | — | — | County |
| 26 May 2019 | Flash Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 10 Aug 2017 | Flood | — | $7K | — | — | — | County |
| 11 May 2017 | Flood | — | — | — | — | — | County |
| 4 Aug 2011 | Flash Flood | — | $20K | — | — | — | County |
| 9 Jul 2010 | Flash Flood | — | — | — | — | — | County |
| 7 Sep 2009 | Flood | — | $145K | — | — | — | County |
| 3 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 6 Jul 2008 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2001 | Flood | — | — | — | — | — | Forecast zone |
| 23 Jul 2001 | Flood | — | — | — | — | — | Forecast zone |
| 6 Apr 2001 | Flash Flood | — | — | — | — | — | County |
| 15 Jul 1999 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 6 Sep 1996 | Flash Flood | — | — | — | — | — | County |
| 15 Jun 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Thomas County had?
37 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 Thomas County?
20 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Thomas County?
The flood of 7 Sep 2009, with property damage estimated by NCEI at $145K.
How does Thomas County compare with Kansas for flood?
3.4 events per 100 square miles against 5.6 statewide; the county holds 37 of the state's 4,604 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.