42
Recorded events
0
Direct deaths
0
Direct injuries
$700K
Property damage
Flash Flood in Dauphin County, Pennsylvania: 42 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #779 nationally and #36 statewide for this hazard.
Decade by decade
Flash Flood in Dauphin County, Pennsylvania: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Dauphin County is the 2000s, when 13 of the county's 42 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 Dauphin County archive, flash flood makes up 7.6% of all recorded severe weather across 7 hazard types. Nationally the county sits at #779 for this hazard and #36 within Pennsylvania, putting it in the 74.5 percentile of all U.S. counties.
Seasonality
Events by month
Sep is the peak month for flash flood in Dauphin County with 10 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.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| May 6, 2025 | PENBROOK | 0 | $0 |
| Sep 22, 2024 | GLENWOOD | 0 | $0 |
| Sep 22, 2024 | GLENWOOD | 0 | $100K |
| Sep 1, 2021 | WILLIAMSTOWN | 0 | $0 |
| Aug 11, 2021 | WEST END | 0 | $0 |
| Jul 17, 2021 | LENKERVILLE | 0 | $0 |
| Jul 12, 2021 | (HAR)WSO HARRISBURGT | 0 | $0 |
| Jul 24, 2018 | ELIZABETHVILLE | 0 | $0 |
| Jul 23, 2018 | GRANTVILLE | 0 | $0 |
| Jul 23, 2017 | ENHAUT | 0 | $0 |
Other hazards here
More from Dauphin County
- Thunderstorm Wind 381
- Hail 90
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Heavy rain produced by slow moving thunderstorms caused flash flooding in Dauphin County in Derry Township, mainly south of Hershey. There were 7 residential structures that were affected. Two homes sustained major damage, while another five sustained minor damage. Five additional reports of flooded basements were received. In addition, seven vehicle rescues were performed. A state of emergency was declared in Derry Township by local emergency management officials.
Flash flooding of portions of an apartment complex on King George Drive in Lower Paxton Township near the Colonial Park Mall resulted in persons being trapped and evacuated, and the partial collapse of a wall of one apartment building.
Heavy thunderstorm rains produced significant flash flooding throughout the city of Harrisburg. The flooding closed multiple roads including a portion of the I-283/83 interchange. High water also forced the evacuation of 40 residents on 19th and Rollerston Streets.
Quick answers
Frequently asked
How many flash flood events are on record in Dauphin County, Pennsylvania?
42 flash flood events are recorded in Dauphin County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in Dauphin County?
The strongest flash flood on record in Dauphin County measured 0.
Where does the flash flood data for Dauphin 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 Dauphin County, Pennsylvania.” Severe Weather History. severeweatherhistory.com/county/pennsylvania/dauphin-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.