Debris Flow in Fresno County, California

Debris Flow in Fresno County, California: 40 recorded events between 2016 and 2025. The strongest on record measured 0. That places the county #5 nationally and #5 statewide for this hazard.

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

The busiest decade for debris flow in Fresno County is the 2020s, when 30 of the county's 40 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 Fresno County archive, debris flow makes up 5.1% of all recorded severe weather across 12 hazard types. Nationally the county sits at #5 for this hazard and #5 within California, putting it in the 98.8 percentile of all U.S. counties.

Jan is the peak month for debris flow in Fresno County with 12 recorded events, while Jun 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.

• Flood 312
• Heavy Rain 107
• Hail 85
• Thunderstorm Wind 78
• Funnel Cloud 47

How many debris flow events are on record in Fresno County, California?

40 debris flow events are recorded in Fresno County between 2016 and 2025, causing 0 direct deaths.

What is the strongest debris flow recorded in Fresno County?

The strongest debris flow on record in Fresno County measured 0.

Where does the debris flow data for Fresno 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.