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Flood in Calvert County, Maryland
63 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.
Calvert County, Maryland, has 63 flood events in the NCEI record since 1950, with at least one in 23 different years.
July is the busiest month, with 12 of the recorded events. The last 20 years account for 52 events against 11 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.8% of the 3,545 flood events recorded in Maryland; its 29.6 per 100 square miles compares with 36.5 statewide.
Compared with Maryland
| Measure | Calvert County | Maryland | US |
|---|---|---|---|
| Flood events since 1950 | 63 | 3,545 | 183,559 |
| Per 100 square miles | 29.6 | 36.5 | 5.2 |
| Per 10,000 residents | 6.7 | 5.8 | 5.5 |
| Deaths recorded | 0 | 24 | 2,961 |
| Busiest month | July | July | June |
By year
Seasonality
3Feb
2Mar
2Apr
0May
8Jun
6Jul
12Aug
11Sep
9Oct
8Nov
1Dec
1
Recorded events
All 63 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 |
|---|---|---|---|---|---|---|---|
| 9 Jan 2024 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 18 Dec 2023 | Flood | — | — | — | — | — | County |
| 22 May 2022 | Flood | — | — | — | — | — | County |
| 29 Oct 2021 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 20 Aug 2021 | Flood | — | — | — | — | — | County |
| 14 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2021 | Flood | — | — | — | — | — | County |
| 4 Aug 2020 | Flood | — | — | — | — | — | County |
| 4 Aug 2020 | Flood | — | — | — | — | — | County |
| 4 Aug 2020 | Flood | — | — | — | — | — | County |
| 4 Aug 2020 | Flood | — | — | — | — | — | County |
| 12 Oct 2019 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 11 Oct 2019 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 31 Jul 2019 | Flood | — | — | — | — | — | County |
| 11 Oct 2018 | Flood | — | — | — | — | — | County |
| 11 Oct 2018 | Flood | — | — | — | — | — | County |
| 11 Aug 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flood | — | — | — | — | — | County |
| 27 May 2018 | Flood | — | — | — | — | — | County |
| 27 May 2018 | Flood | — | — | — | — | — | County |
| 6 Mar 2018 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 6 Jul 2017 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2016 | Flood | — | $5K | — | — | — | County |
| 29 May 2016 | Flash Flood | — | — | — | — | — | County |
| 2 May 2016 | Flood | — | — | — | — | — | County |
| 2 May 2016 | Flood | — | — | — | — | — | County |
| 4 Oct 2015 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 30 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 30 Oct 2012 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 26 Aug 2012 | Flash Flood | — | — | — | — | — | County |
| 9 Sep 2011 | Flood | — | — | — | — | — | County |
| 9 Sep 2011 | Flood | — | — | — | — | — | County |
| 8 Sep 2011 | Flash Flood | — | — | — | — | — | County |
| 8 Sep 2011 | Flash Flood | — | — | — | — | — | County |
| 10 Mar 2011 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 30 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 30 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 30 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 12 Nov 2009 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 22 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 22 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 22 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 12 May 2008 | Flood | — | — | — | — | — | County |
| 11 May 2008 | Coastal Flood | — | — | — | — | — | Forecast zone |
| 26 Jun 2006 | Flash Flood | — | — | — | — | — | County |
| 14 Jan 2005 | Flood | — | — | — | — | — | Forecast zone |
| 25 Jun 2004 | Flash Flood | — | — | — | — | — | County |
| 2 Sep 2000 | Flash Flood | — | — | — | — | — | County |
| 26 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 16 Sep 1999 | Flash Flood | — | $500K | — | — | — | County |
| 4 Feb 1998 | Coastal Flood | — | $200K | — | — | — | Forecast zone |
| 4 Feb 1998 | Flash Flood | — | $30K | — | — | — | County |
| 28 Jan 1998 | Flash Flood | — | $5K | — | — | — | County |
| 8 Oct 1996 | Coastal Flood | — | $10K | — | — | — | Forecast zone |
| 20 Jun 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Calvert County had?
63 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 Calvert County?
9 Jan 2024 (Coastal Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Calvert County?
The flash flood of 16 Sep 1999, with property damage estimated by NCEI at $500K.
How does Calvert County compare with Maryland for flood?
29.6 events per 100 square miles against 36.5 statewide; the county holds 63 of the state's 3,545 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.