Severe Weather History


Hazard archive · 1950 — present

Flash Flood in Philadelphia County, Pennsylvania

142

Recorded events

4

Direct deaths

0

Direct injuries

$124.2M

Property damage

Flash Flood in Philadelphia County, Pennsylvania: 142 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #84 nationally and #9 statewide for this hazard.

Decade by decade

Flash Flood in Philadelphia County, Pennsylvania: events per decade

Flash Flood in Philadelphia County, Pennsylvania: recorded events per decade
Flash Flood in Philadelphia County, Pennsylvania: recorded events per decade

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

The busiest decade for flash flood in Philadelphia County is the 2020s, when 59 of the county's 142 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 Philadelphia County archive, flash flood makes up 22.1% of all recorded severe weather across 8 hazard types. Nationally the county sits at #84 for this hazard and #9 within Pennsylvania, putting it in the 97.3 percentile of all U.S. counties.

Seasonality

Events by month

1Jan
2Feb
2Mar
2Apr
8May
20Jun
49Jul
32Aug
22Sep
3Oct
0Nov
1Dec

Jul is the peak month for flash flood in Philadelphia County with 49 recorded events, while Nov 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

DateLocationScaleDeathsInjuriesDamage
Sep 8, 2011(PHL)PHILADELPHIA IN010$0
Jul 13, 2010TACONY010$0
Sep 28, 2004COUNTYWIDE010$2.0M
Sep 16, 1999COUNTYWIDE010$4.2M
Source: NOAA/NCEI Storm Events · dates UTC

Most recent

Latest recorded events

DateLocationMagnitudeDamage
Aug 18, 2025BUSTLETON0$0
Aug 13, 2025CRESCENTVILLE0$0
Jul 31, 2025PHILADELPHIA0$0
Jul 9, 2025CRESCENTVILLE0$0
Jul 9, 2025BRIDESBURG0$0
Jul 8, 2025PHILADELPHIA0$0
Jul 8, 2025BUSTLETON0$0
Jul 8, 2025MANAYUNK0$0
Jul 1, 2025TORRESDALE0$0
Jul 1, 2025FOX CHASE0$0
Source: NOAA/NCEI Storm Events · dates UTC · recent entries may be preliminary

Other hazards here

More from Philadelphia County

County overview →

From the record

What the reports say

Written by National Weather Service staff at the time of the event · public domain

Quick answers

Frequently asked

How many flash flood events are on record in Philadelphia County, Pennsylvania?

142 flash flood events are recorded in Philadelphia County between 1996 and 2025, causing 4 direct deaths.

What is the strongest flash flood recorded in Philadelphia County?

The strongest flash flood on record in Philadelphia County measured 0.

Where does the flash flood data for Philadelphia 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 Philadelphia County, Pennsylvania.” Severe Weather History. severeweatherhistory.com/county/pennsylvania/philadelphia-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.


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