Flash Flood in Johnson County, Missouri

Flash Flood in Johnson County, Missouri: 47 recorded events between 1996 and 2020. The strongest on record measured 0. That places the county #663 nationally and #42 statewide for this hazard.

Reporting practice changed over time — early decades are undercounted, not calmer.

The busiest decade for flash flood in Johnson County is the 2010s, when 29 of the county's 47 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 7.3% of all recorded severe weather across 7 hazard types. Nationally the county sits at #663 for this hazard and #42 within Missouri, putting it in the 78.3 percentile of all U.S. counties.

May is the peak month for flash flood in Johnson County with 12 recorded events, while Feb 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.

• Hail 292
• Thunderstorm Wind 241

How many flash flood events are on record in Johnson County, Missouri?

47 flash flood events are recorded in Johnson County between 1996 and 2020, causing 0 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.