192
Recorded events
9
Direct deaths
8
Direct injuries
$139.7M
Property damage
Flash Flood in Montgomery County, Pennsylvania: 192 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #47 nationally and #4 statewide for this hazard.
Decade by decade
Flash Flood in Montgomery County, Pennsylvania: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Montgomery County is the 2010s, when 72 of the county's 192 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 Montgomery County archive, flash flood makes up 17.2% of all recorded severe weather across 8 hazard types. Nationally the county sits at #47 for this hazard and #4 within Pennsylvania, putting it in the 98.5 percentile of all U.S. counties.
Seasonality
Events by month
Aug is the peak month for flash flood in Montgomery County with 55 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.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Sep 16, 1999 | COUNTYWIDE | 0 | 3 | 8 | $12.0M |
| Sep 1, 2021 | KING OF PRUSSIA | 0 | 2 | 0 | $20.0M |
| Sep 8, 1996 | SOUTHERN | 0 | 2 | 0 | $20.0M |
| Aug 4, 2020 | WORCESTER | 0 | 1 | 0 | $4K |
| Jun 16, 2001 | SOUTH PORTION | 0 | 1 | 0 | $33.5M |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 31, 2025 | PHILMONT COUNTRY CLU | 0 | $25K |
| Jul 31, 2025 | PHILMONT COUNTRY CLU | 0 | $25K |
| Jul 31, 2025 | BETHAYRES | 0 | $30K |
| Jul 14, 2025 | FRUITVILLE | 0 | $0 |
| Jul 14, 2025 | POTTSTOWN | 0 | $0 |
| Jul 10, 2025 | HARMONVILLE | 0 | $0 |
| Jul 10, 2025 | SWEDELAND | 0 | $0 |
| Jul 1, 2025 | FRUITVILLE | 0 | $0 |
| May 31, 2025 | FRUITVILLE | 0 | $0 |
| May 16, 2025 | SPRING MT | 0 | $0 |
Other hazards here
More from Montgomery County
- Thunderstorm Wind 623
- Hail 132
- Flood 67
- Lightning 48
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Widespread flash flooding occurred in Montgomery County with many road closures and vehicles stranded. Numerous water rescues took place. There were two flood related fatalities, one in Skippack and one in Bridgeport. Many buildings and homes were flooded. Most waterways in the county overflowed their banks, including the Schuylkill River, Perkiomen Creek and Wissahickon Creek.
A 5-year-old girl with autism was swept away by flood waters running through a tributary of Towamencin Creek after wandering away from her nearby family home. Rescuers found the victim's body adjacent to the creek in Fischer's Park after a 22-hour search.
Widespread flash flooding occurred in Montgomery County with many road closures and vehicles stranded. Numerous water rescues took place. Many buildings and homes were flooded. Most waterways in the county overflowed their banks, including the Schuylkill River, Perkiomen Creek and Wissahickon Creek.
Quick answers
Frequently asked
How many flash flood events are on record in Montgomery County, Pennsylvania?
192 flash flood events are recorded in Montgomery County between 1996 and 2025, causing 9 direct deaths.
What is the strongest flash flood recorded in Montgomery County?
The strongest flash flood on record in Montgomery County measured 0.
Where does the flash flood data for Montgomery 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 Montgomery County, Pennsylvania.” Severe Weather History. severeweatherhistory.com/county/pennsylvania/montgomery-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.