61
Recorded events
1
Direct deaths
0
Direct injuries
$4.6M
Property damage
Flash Flood in Lyon County, Kansas: 61 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #440 nationally and #11 statewide for this hazard.
Decade by decade
Flash Flood in Lyon County, Kansas: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Lyon County is the 2010s, when 23 of the county's 61 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Lyon County archive, flash flood makes up 7.1% of all recorded severe weather across 8 hazard types. Nationally the county sits at #440 for this hazard and #11 within Kansas, putting it in the 85.3 percentile of all U.S. counties.
Seasonality
Events by month
May is the peak month for flash flood in Lyon County with 17 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jul 10, 2015 | PLYMOUTH | 0 | 1 | 0 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jun 3, 2025 | EMPORIA | 0 | $20K |
| Aug 13, 2024 | EMPORIA | 0 | $0 |
| Aug 13, 2024 | EMPORIA | 0 | $0 |
| Jun 9, 2024 | EMPORIA | 0 | $0 |
| Jun 16, 2022 | HARTFORD | 0 | $0 |
| Jun 16, 2022 | HARTFORD | 0 | $0 |
| Aug 13, 2021 | EMPORIA | 0 | $0 |
| Jun 25, 2021 | OLPE | 0 | $0 |
| Jun 25, 2021 | OLPE | 0 | $0 |
| Jul 21, 2020 | EMPORIA | 0 | $0 |
Other hazards here
More from Lyon County
- Hail 376
- Thunderstorm Wind 343
- Tornado 49
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Flooding over the Kansas turnpike at mile marker 118. This shut down the northbound lanes. A 21 year old male driver hydroplaned and lost control of his vehicle. The vehicle left the road and was then swept downstream by the flood waters. He was not able to survive.
Thunderstorms produced heavy rains totaling 3 to 6 inches the morning of the 24th with flash flooding the result. Numerous rural roads and bridges were washed out or badly damaged. Damage totals were over 900 thousand dollars.
Report of water flowing over K-99 north of town. This portion of the road has been barricaded by law enforcement. Unofficial reports of 5 to 6 inches of rain received. The police department reported water damage and several evacuations took place.
Quick answers
Frequently asked
How many flash flood events are on record in Lyon County, Kansas?
61 flash flood events are recorded in Lyon County between 1996 and 2025, causing 1 direct deaths.
What is the strongest flash flood recorded in Lyon County?
The strongest flash flood on record in Lyon County measured 0.
Where does the flash flood data for Lyon County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in Lyon County, Kansas.” Severe Weather History. severeweatherhistory.com/county/kansas/lyon-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.