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Flood in Cobb County, Georgia
53 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.
Cobb County, Georgia, has 53 flood events in the NCEI record since 1950, with at least one in 20 different years.
September is the busiest month, with 13 of the recorded events. The last 20 years account for 27 events against 26 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.6% of the 3,250 flood events recorded in Georgia; its 15.6 per 100 square miles compares with 5.6 statewide.
Compared with Georgia
| Measure | Cobb County | Georgia | US |
|---|---|---|---|
| Flood events since 1950 | 53 | 3,250 | 183,559 |
| Per 100 square miles | 15.6 | 5.6 | 5.2 |
| Per 10,000 residents | 0.7 | 3.0 | 5.5 |
| Deaths recorded | 0 | 18 | 2,961 |
| Busiest month | September | March | June |
By year
Seasonality
2Feb
6Mar
1Apr
3May
4Jun
5Jul
10Aug
1Sep
13Oct
2Nov
4Dec
2
Recorded events
All 53 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 |
|---|---|---|---|---|---|---|---|
| 7 Sep 2021 | Flash Flood | — | $1.9M | — | — | — | County |
| 6 Feb 2020 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 2020 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 2020 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 2020 | Flash Flood | — | — | — | — | — | County |
| 12 Nov 2018 | Flash Flood | — | — | — | — | — | County |
| 12 Nov 2018 | Flash Flood | — | — | — | — | — | County |
| 12 Nov 2018 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 2017 | Flash Flood | — | $3K | — | — | — | County |
| 5 Apr 2017 | Flash Flood | — | — | — | — | — | County |
| 5 Apr 2017 | Flash Flood | — | — | — | — | — | County |
| 24 Dec 2015 | Flash Flood | — | $10K | — | — | — | County |
| 4 Jan 2015 | Flash Flood | — | $2K | — | — | — | County |
| 20 Jul 2013 | Flash Flood | — | $3K | — | — | — | County |
| 11 Jul 2012 | Flash Flood | — | $5K | — | — | — | County |
| 11 Jul 2012 | Flash Flood | — | $70K | — | — | — | County |
| 15 Apr 2011 | Flash Flood | — | $20K | — | — | — | County |
| 3 May 2010 | Flash Flood | — | $3K | — | — | — | County |
| 12 Oct 2009 | Flood | — | $5K | — | — | — | County |
| 12 Oct 2009 | Flash Flood | — | $5K | — | — | — | County |
| 26 Sep 2009 | Flash Flood | — | $2K | — | — | — | County |
| 21 Sep 2009 | Flood | — | $5.7M | — | — | — | County |
| 21 Sep 2009 | Flood | — | $11M | — | — | — | County |
| 21 Sep 2009 | Flash Flood | — | $10K | — | — | — | County |
| 21 Sep 2009 | Flood | — | $13M | — | — | — | County |
| 20 Sep 2009 | Flash Flood | — | $230K | — | — | — | County |
| 20 Sep 2009 | Flash Flood | — | $12K | — | — | — | County |
| 11 Jul 2005 | Flood | — | $250K | — | — | — | Forecast zone |
| 11 Jul 2005 | Flash Flood | — | $6.0M | — | — | — | County |
| 23 Nov 2004 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2004 | Flood | — | $500K | — | — | — | Forecast zone |
| 27 Sep 2004 | Flash Flood | — | $500K | — | — | — | County |
| 16 Sep 2004 | Flood | — | $5.0M | — | — | — | Forecast zone |
| 16 Sep 2004 | Flash Flood | — | $1.0M | — | — | — | County |
| 5 Aug 2004 | Flash Flood | — | $5K | — | — | — | County |
| 10 Jul 2003 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2003 | Flood | — | — | — | — | — | Forecast zone |
| 16 Jun 2003 | Flash Flood | — | $250K | — | — | — | County |
| 6 May 2003 | Flash Flood | — | $5K | — | — | — | County |
| 6 May 2003 | Flash Flood | — | $50K | — | — | — | County |
| 6 May 2003 | Flash Flood | — | $75K | — | — | — | County |
| 24 Dec 2002 | Flash Flood | — | — | — | — | — | County |
| 23 Jul 2002 | Flood | — | — | — | — | — | County |
| 3 Jul 2002 | Flood | — | — | — | — | — | County |
| 4 Jun 2002 | Flood | — | — | — | — | — | County |
| 22 Jun 2001 | Flood | — | — | — | — | — | County |
| 21 Sep 2000 | Flood | — | — | — | — | — | County |
| 30 Jun 1999 | Flash Flood | — | $1.2M | — | — | — | County |
| 8 Mar 1998 | Flood | — | $10K | — | — | — | Forecast zone |
| 4 Feb 1998 | Flash Flood | — | $2K | — | — | — | County |
| 23 Jul 1997 | Flash Flood | — | $2K | — | — | — | County |
| 27 Feb 1997 | Flood | — | — | — | — | — | Forecast zone |
| 26 Jan 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Cobb County had?
53 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 Cobb County?
7 Sep 2021 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Cobb County?
The flood of 21 Sep 2009, with property damage estimated by NCEI at $13M.
How does Cobb County compare with Georgia for flood?
15.6 events per 100 square miles against 5.6 statewide; the county holds 53 of the state's 3,250 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.