84
Recorded events
3
Direct deaths
0
Direct injuries
$9.0M
Property damage
Flash Flood in Johnson County, Kansas: 84 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #244 nationally and #6 statewide for this hazard.
Decade by decade
Flash Flood in Johnson County, Kansas: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Johnson County is the 2000s, when 45 of the county's 84 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 Johnson County archive, flash flood makes up 6.1% of all recorded severe weather across 8 hazard types. Nationally the county sits at #244 for this hazard and #6 within Kansas, putting it in the 92.1 percentile of all U.S. counties.
Seasonality
Events by month
Jun is the peak month for flash flood in Johnson County with 23 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 |
|---|---|---|---|---|---|
| Oct 5, 1998 | OVERLAND PARK | 0 | 2 | 0 | $8.0M |
| Aug 31, 2003 | OVERLAND PARK | 0 | 1 | 0 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 17, 2025 | OLATHE | 0 | $10K |
| Jul 17, 2025 | CLARE | 0 | $0 |
| Jul 1, 2024 | KENNETH | 0 | $0 |
| Jul 14, 2023 | ROELAND PARK | 0 | $0 |
| Aug 13, 2021 | OLATHE | 0 | $0 |
| May 28, 2020 | STILWELL MISSION ARP | 0 | $0 |
| May 1, 2019 | (OJC)JOHNSON CO EXEC | 0 | $0 |
| May 1, 2019 | CRAIG | 0 | $0 |
| Aug 22, 2017 | OLATHE | 0 | $0 |
| Aug 6, 2017 | FAIRWAY | 0 | $0 |
Other hazards here
More from Johnson County
- Hail 657
- Thunderstorm Wind 567
- Tornado 45
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Several homes were flooded in Olathe and Mission Hills, and fire and rescue units responded to 74 emergency calls during the morning of June 28. Unofficial reports were received of 4 inches of rain in an hour, and a storm total of 7.8 inches was received at 131st and Kenneth Road. Near Stanley, flood waters from the Blue River were over the 151st Street bridge. Sections of Interstate 35 were closed due to high water.
Tomahawk Creek at Roe Avenue reached a record crest of 20.81 feet and caused several houses and business to be flooded. The city of Leawood lost several service vehicles in a compound near the creek's banks. The value of these losses were not provided.
Heavy rains caused 175th Street, to be closed from Highway 56 to Agnus Street. Also, rains closed 215th Street, from Edgerton Road to Moonlight Road. In addition, heavy rains closed 199th Street, from Four Corners to Highway 56.
Quick answers
Frequently asked
How many flash flood events are on record in Johnson County, Kansas?
84 flash flood events are recorded in Johnson County between 1996 and 2025, causing 3 direct deaths.
What is the strongest flash flood recorded in Johnson County?
The strongest flash flood on record in Johnson County measured 0.
Where does the flash flood data for Johnson 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 Johnson County, Kansas.” Severe Weather History. severeweatherhistory.com/county/kansas/johnson-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.