Alert archive / Georgia / Flash Flood Warnings
Flash Flood Warnings in Georgia, 2012
46 flash flood warnings in 2012. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Flash Flood Warnings
- 46
- Busiest month
- August13 flash flood warnings
- Busiest day
- March 3, 20128 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
19 of 46 flash flood warnings covering Georgia in 2012 had a flash flood report inside them; 34 of 40 flash flood reports fell inside a warning, on average 43 minutes after it went out.
Georgia, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 46 | 19 | 59% | 40 | 85% | 43 min |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: flash flood warnings | 23 | 9 | 61% | 16 | 81% | 50 min |
| NWS Tallahassee, FL: flash flood warnings | 37 | 20 | 46% | 44 | 93% | 97 min |
| NWS Charleston, SC: flash flood warnings | 11 | 6 | 45% | 31 | 87% | 144 min |
| NWS Jacksonville, FL: flash flood warnings | 22 | 7 | 68% | 24 | 83% | 89 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 33 | 19 | 42% | 47 | 79% | 46 min |
| NWS Columbia, SC: flash flood warnings | 14 | 12 | 14% | 39 | 90% | 46 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 10:19 AM EST | Flash Flood Warning | FFC | Carroll, Douglas | 4 hr |
| Jan 21, 10:50 AM EST | Flash Flood Warning | FFC | DeKalb, Fulton | 5 hr |
| Jan 21, 12:04 PM EST | Flash Flood Warning | FFC | Clayton | 2 hr |
| Jan 23, 9:24 AM EST | Flash Flood Warning | FFC | Dade | 6 hr |
| Jan 26, 5:18 PM EST | Flash Flood Warning | FFC | Dade | 6 hr |
| Mar 2, 11:19 PM EST | Flash Flood Warning | FFC | Chattooga, Floyd, Gordon | 4 hr |
| Mar 3, 12:11 AM EST | Flash Flood Warning | FFC | Gilmer, Pickens | 5 hr |
| Mar 3, 3:47 AM EST | Flash Flood Warning | FFC | DeKalb | 6 hr |
| Mar 3, 4:11 AM EST | Flash Flood Warning | FFC | Gwinnett | 6 hr |
| Mar 3, 12:34 PM EST | Flash Flood Warning | TAE | Baker, Decatur, Early, Miller, Seminole | 3 hr |
| Mar 3, 1:29 PM EST | Flash Flood Warning | TAE | Decatur, Seminole | 3 hr |
| Mar 3, 1:34 PM EST | Flash Flood Warning | TAE | Berrien, Brooks, Cook, Decatur, Grady, Lanier and 2 more | 3 hr |
| Mar 3, 4:29 PM EST | Flash Flood Warning | TAE | Berrien, Brooks, Cook, Lanier, Lowndes | 83 min |
| Mar 15, 3:29 PM EDT | Flash Flood Warning | FFC | Dawson | 3 hr |
| May 13, 7:47 PM EDT | Flash Flood Warning | FFC | Harris, Muscogee | 3 hr |
| May 29, 6:07 PM EDT | Flash Flood Warning | CHS | Jenkins, Screven | 3 hr |
| Jun 6, 4:18 PM EDT | Flash Flood Warning | TAE | Thomas | 3 hr |
| Jun 13, 8:49 PM EDT | Flash Flood Warning | FFC | Clayton, Fulton | 6 hr |
| Jun 13, 9:02 PM EDT | Flash Flood Warning | FFC | Cobb, Fulton | 6 hr |
| Jun 13, 9:31 PM EDT | Flash Flood Warning | FFC | DeKalb | 80 min |
| Jun 14, 7:33 AM EDT | Flash Flood Warning | GSP | Stephens | 3 hr |
| Jun 25, 7:49 PM EDT | Flash Flood Warning | TAE | Brooks, Lowndes | 5 hr |
| Jun 25, 10:39 PM EDT | Flash Flood Warning | JAX | Charlton | 3 hr |
| Jun 25, 11:03 PM EDT | Flash Flood Warning | JAX | Charlton | 3 hr |
| Jun 26, 1:18 AM EDT | Flash Flood Warning | JAX | Charlton | 4 hr |
| Jun 26, 4:28 AM EDT | Flash Flood Warning | JAX | Camden, Charlton | 4 hr |
| Jun 26, 5:31 AM EDT | Flash Flood Warning | JAX | Clinch, Echols, Ware | 3 hr |
| Jul 11, 11:50 PM EDT | Flash Flood Warning | FFC | Cobb | 6 hr |
| Jul 14, 5:40 AM EDT | Flash Flood Warning | GSP | Rabun | 3 hr |
| Aug 2, 8:05 PM EDT | Flash Flood Warning | FFC | DeKalb, Fulton | 4 hr |
| Aug 7, 7:45 PM EDT | Flash Flood Warning | CAE | Columbia, McDuffie, Richmond | 2 hr |
| Aug 7, 8:12 PM EDT | Flash Flood Warning | FFC | Banks, Jackson, Madison | 2 hr |
| Aug 8, 3:42 AM EDT | Flash Flood Warning | TAE | Berrien, Irwin, Tift | 2 hr |
| Aug 8, 5:54 AM EDT | Flash Flood Warning | TAE | Berrien, Irwin, Tift | 2 hr |
| Aug 8, 8:18 AM EDT | Flash Flood Warning | TAE | Berrien, Irwin, Tift | 87 min |
| Aug 9, 2:37 PM EDT | Flash Flood Warning | TAE | Dougherty | 83 min |
| Aug 11, 10:21 AM EDT | Flash Flood Warning | CAE | Columbia, Richmond | 84 min |
| Aug 11, 9:04 PM EDT | Flash Flood Warning | FFC | Toombs | 4 hr |
| Aug 16, 6:52 PM EDT | Flash Flood Warning | TAE | Dougherty, Worth | 2 hr |
| Aug 24, 1:12 AM EDT | Flash Flood Warning | FFC | Banks, Hall, Lumpkin, White | 6 hr |
| Aug 25, 5:23 PM EDT | Flash Flood Warning | GSP | Rabun | 3 hr |
| Aug 28, 7:35 PM EDT | Flash Flood Warning | CHS | Evans, Liberty, Long, Tattnall | 60 min |
| Oct 1, 9:23 PM EDT | Flash Flood Warning | FFC | Hall | 6 hr |
| Oct 1, 10:17 PM EDT | Flash Flood Warning | FFC | Meriwether, Pike, Spalding, Upson | 3 hr |
| Oct 1, 10:56 PM EDT | Flash Flood Warning | FFC | DeKalb, Gwinnett | 6 hr |
| Oct 2, 2:49 AM EDT | Flash Flood Warning | FFC | White | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- DeKalb County5
- Berrien County5
- Fulton County4
- Charlton County4
- Decatur County3
- Brooks County3
- Lowndes County3
- Irwin County3
- Tift County3
- Clayton County2
- Dade County2
- Gwinnett County2
- Seminole County2
- Cook County2
- Lanier County2
- Thomas County2
- Cobb County2
- Rabun County2
- Columbia County2
- Richmond County2
- Banks County2
- Dougherty County2
- Hall County2
- White County2
- Carroll County1
- Douglas County1
- Chattooga County1
- Floyd County1
- Gordon County1
- Gilmer County1
- Pickens County1
- Baker County1
- Early County1
- Miller County1
- Grady County1
- Dawson County1
- Harris County1
- Muscogee County1
- Jenkins County1
- Screven County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.