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Flood in Adams County, Pennsylvania
52 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 52 flood events in Adams County, Pennsylvania, between 1950 and 2026, spread over 20 years.
September is the busiest month, with 12 of the recorded events. The last 20 years account for 25 events against 27 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.7% of the 7,057 flood events recorded in Pennsylvania; its 10.0 per 100 square miles compares with 15.8 statewide.
NCEI attributes 2 deaths in the county to floods and flash floods.
Compared with Pennsylvania
| Measure | Adams County | Pennsylvania | US |
|---|---|---|---|
| Flood events since 1950 | 52 | 7,057 | 183,559 |
| Per 100 square miles | 10.0 | 15.8 | 5.2 |
| Per 10,000 residents | 5.0 | 5.4 | 5.5 |
| Deaths recorded | 2 | 110 | 2,961 |
| Busiest month | September | July | June |
By year
Seasonality
5Feb
1Mar
5Apr
5May
4Jun
7Jul
5Aug
3Sep
12Oct
2Nov
1Dec
2
Recorded events
All 52 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 12 Jul 2025 | Flood | — | — | — | — | — | County |
| 15 May 2025 | Flash Flood | — | — | — | — | — | County |
| 15 May 2025 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 2019 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 2019 | Flash Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | 1 | — | County |
| 20 Aug 2015 | Flash Flood | — | — | — | — | — | County |
| 16 May 2014 | Flood | — | — | — | — | — | County |
| 30 Apr 2014 | Flood | — | — | — | — | — | County |
| 30 Mar 2014 | Flood | — | — | — | — | — | County |
| 10 Oct 2013 | Flood | — | — | — | — | — | County |
| 31 Jan 2013 | Flood | — | — | — | — | — | County |
| 29 Oct 2012 | Flood | — | — | — | — | — | County |
| 18 Sep 2012 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2011 | Flash Flood | — | — | — | — | — | County |
| 23 Sep 2011 | Flash Flood | — | — | — | — | — | County |
| 23 Sep 2011 | Flood | — | — | — | — | — | County |
| 11 Sep 2011 | Flash Flood | — | $64K | — | — | — | County |
| 28 Apr 2011 | Flash Flood | — | — | — | — | — | County |
| 16 Apr 2011 | Flash Flood | — | — | — | — | — | County |
| 10 Mar 2011 | Flood | — | — | — | — | — | County |
| 12 Aug 2010 | Flash Flood | — | $10K | — | — | — | County |
| 25 Jan 2010 | Flood | — | $10K | — | — | — | County |
| 5 Mar 2008 | Flood | — | — | — | — | — | County |
| 15 Apr 2007 | Flood | — | — | — | — | — | County |
| 28 Jun 2006 | Flood | — | — | — | — | — | County |
| 27 Jun 2006 | Flash Flood | — | — | — | 1 | — | County |
| 25 Jun 2006 | Flash Flood | — | — | — | — | — | County |
| 7 Aug 2005 | Flash Flood | — | — | — | — | — | County |
| 7 Jul 2005 | Flash Flood | — | — | — | — | — | County |
| 2 Apr 2005 | Flood | — | — | — | — | — | Forecast zone |
| 28 Mar 2005 | Flood | — | — | — | — | — | Forecast zone |
| 28 Sep 2004 | Flood | — | — | — | — | — | Forecast zone |
| 17 Sep 2004 | Flood | — | — | — | — | — | Forecast zone |
| 14 Jun 2004 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 2004 | Flood | — | — | — | — | — | Forecast zone |
| 11 Dec 2003 | Flood | — | — | — | — | — | Forecast zone |
| 23 Sep 2003 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2003 | Flash Flood | — | — | — | — | — | County |
| 16 May 2003 | Flood | — | — | — | — | — | Forecast zone |
| 1 Sep 2000 | Flash Flood | — | $20K | — | — | — | County |
| 16 Sep 1999 | Flash Flood | — | $20K | — | — | — | County |
| 21 Mar 1998 | Flash Flood | — | — | — | — | — | County |
| 8 Jan 1998 | Flash Flood | — | — | — | — | — | County |
| 7 Nov 1997 | Flash Flood | — | — | — | — | — | County |
| 11 Sep 1997 | Flash Flood | — | — | — | — | — | County |
| 13 Dec 1996 | Flash Flood | — | — | — | — | — | County |
| 6 Sep 1996 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 1996 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 1996 | Flash Flood | — | — | — | — | — | County |
| 19 Jan 1996 | Flood | — | — | — | — | — | Forecast zone |
| 19 Jan 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Adams County had?
52 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Adams County?
12 Jul 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Adams County?
The flash flood of 11 Sep 2011, with property damage estimated by NCEI at $64K.
How does Adams County compare with Pennsylvania for flood?
10.0 events per 100 square miles against 15.8 statewide; the county holds 52 of the state's 7,057 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.