Alert archive / Georgia / Gwinnett County
Weather alerts in Gwinnett County, Georgia, 2012
115 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Gwinnett County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 115
- Warnings
- 24
- Watches
- 9
- Advisories
- 25
- Busiest month
- July24 alerts
- Busiest day
- January 21, 20127 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Gwinnett County in 2012 had a tornado report inside them.
Gwinnett County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 12 | 9 | 25% | 6 | 100% | 13 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: tornado warnings | 28 | 9 | 68% | 16 | 75% | 22 min |
| NWS Atlanta, GA: severe thunderstorm warnings | 350 | 215 | 39% | 421 | 75% | 15 min |
| NWS Atlanta, GA: flash flood warnings | 23 | 9 | 61% | 16 | 81% | 50 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 | Lasted |
|---|---|---|---|
| Jan 1, 2:40 PM EST | Wind Advisory | FFC | 43 hr |
| Jan 7, 7:02 PM EST | Special Weather Statement | FFC | 58 min |
| Jan 8, 4:36 AM EST | Dense Fog Advisory | FFC | 5 hr |
| Jan 8, 6:46 PM EST | Dense Fog Advisory | FFC | 15 hr |
| Jan 10, 4:55 AM EST | Dense Fog Advisory | FFC | 5 hr |
| Jan 11, 2:05 PM EST | Wind Advisory | FFC | 34 hr |
| Jan 21, 5:20 AM EST | Mesoscale Discussion | SPC | 55 min |
| Jan 21, 5:55 AM EST | Tornado Watch | SPC | 7 hr |
| Jan 21, 8:22 AM EST | Mesoscale Discussion | SPC | 83 min |
| Jan 21, 11:01 AM EST | Mesoscale Discussion | SPC | 59 min |
| Jan 21, 11:07 AM EST | Flash Flood Watch | FFC | 4 hr |
| Jan 21, 12:28 PM EST | Tornado Watch | SPC | 8 hr |
| Jan 21, 2:57 PM EST | Mesoscale Discussion | SPC | 63 min |
| Jan 23, 7:48 PM EST | Dense Fog Advisory | FFC | 13 hr |
| Jan 26, 3:16 PM EST | Mesoscale Discussion | SPC | 119 min |
| Feb 10, 2:29 PM EST | Wind Advisory | FFC | 32 hr |
| Feb 15, 4:54 AM EST | Dense Fog Advisory | FFC | 5 hr |
| Feb 24, 6:56 AM EST | Mesoscale Discussion | SPC | 94 min |
| Feb 24, 8:48 AM EST | Tornado Watch | SPC | 7 hr |
| Mar 1, 4:00 AM EST | Mesoscale Discussion | SPC | 90 min |
| Mar 2, 5:37 PM EST | Tornado Watch | SPC | 7 hr |
| Mar 2, 6:41 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 2, 9:11 PM EST | Tornado Warning | FFC | 49 min |
| Mar 2, 9:39 PM EST | Tornado Warning | FFC | 51 min |
| Mar 2, 10:54 PM EST | Tornado Watch | SPC | 6 hr |
| Mar 3, 12:40 AM EST | Mesoscale Discussion | SPC | 95 min |
| Mar 3, 1:42 AM EST | Severe Thunderstorm Warning | FFC | 33 min |
| Mar 3, 1:58 AM EST | Tornado Warning | FFC | 34 min |
| Mar 3, 4:11 AM EST | Flash Flood Warning | FFC | 6 hr |
| Mar 4, 4:15 AM EST | Freeze Watch | FFC | 53 hr |
| Mar 4, 4:15 AM EST | Wind Advisory | FFC | 14 hr |
| Mar 5, 3:55 AM EST | Freeze Warning | FFC | 29 hr |
| Mar 5, 3:55 AM EST | Wind Advisory | FFC | 12 hr |
| Mar 14, 4:23 AM EDT | Dense Fog Advisory | FFC | 6 hr |
| Mar 15, 5:19 PM EDT | Special Weather Statement | FFC | 26 min |
| Mar 16, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 2:58 PM EDT | Red Flag Warning | FFC | 28 hr |
| Apr 11, 2:10 AM EDT | Frost Advisory | FFC | 32 hr |
| Apr 16, 1:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 21, 3:16 PM EDT | Wind Advisory | FFC | 29 hr |
| Apr 23, 4:30 AM EDT | Wind Advisory | FFC | 15 hr |
| Apr 25, 3:40 PM EDT | Wind Advisory | FFC | 28 hr |
| Apr 26, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 27, 6:30 PM EDT | Special Weather Statement | FFC | 30 min |
| May 17, 6:50 PM EDT | Severe Thunderstorm Warning | FFC | 40 min |
| May 20, 5:02 PM EDT | Special Weather Statement | FFC | 28 min |
| May 21, 5:27 PM EDT | Special Weather Statement | FFC | 33 min |
| May 21, 5:52 PM EDT | Special Weather Statement | FFC | 23 min |
| May 21, 6:38 PM EDT | Special Weather Statement | FFC | 37 min |
| May 21, 6:46 PM EDT | Severe Thunderstorm Warning | FFC | 44 min |
| May 21, 7:18 PM EDT | Severe Thunderstorm Warning | FFC | 42 min |
| May 22, 6:59 PM EDT | Special Weather Statement | FFC | 31 min |
| May 22, 7:44 PM EDT | Special Weather Statement | FFC | 31 min |
| May 30, 12:20 AM EDT | Special Weather Statement | FFC | 40 min |
| Jun 29, 3:21 PM EDT | Heat Advisory | FFC | 72 hr |
| Jul 1, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 5, 1:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 5, 7:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 5, 10:21 PM EDT | Special Weather Statement | FFC | 24 min |
| Jul 7, 5:58 PM EDT | Special Weather Statement | FFC | 32 min |
| Jul 9, 8:49 PM EDT | Severe Thunderstorm Warning | FFC | 41 min |
| Jul 10, 12:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 6:30 PM EDT | Severe Thunderstorm Warning | FFC | 30 min |
| Jul 10, 6:50 PM EDT | Severe Thunderstorm Warning | FFC | 40 min |
| Jul 10, 7:00 PM EDT | Severe Thunderstorm Warning | FFC | 30 min |
| Jul 10, 7:27 PM EDT | Special Weather Statement | FFC | 33 min |
| Jul 12, 9:12 PM EDT | Special Weather Statement | FFC | 33 min |
| Jul 12, 9:44 PM EDT | Special Weather Statement | FFC | 31 min |
| Jul 13, 4:27 PM EDT | Special Weather Statement | FFC | 33 min |
| Jul 16, 4:38 PM EDT | Special Weather Statement | FFC | 22 min |
| Jul 16, 4:53 PM EDT | Special Weather Statement | FFC | 37 min |
| Jul 17, 2:11 PM EDT | Severe Thunderstorm Warning | FFC | 36 min |
| Jul 18, 4:33 PM EDT | Special Weather Statement | FFC | 42 min |
| Jul 18, 4:47 PM EDT | Severe Thunderstorm Warning | FFC | 43 min |
| Jul 20, 3:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 11:45 PM EDT | Special Weather Statement | FFC | 30 min |
| Jul 21, 1:34 AM EDT | River Flood Warning | FFC | 3 hr |
| Jul 25, 1:39 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 1, 4:23 PM EDT | Severe Thunderstorm Warning | FFC | 52 min |
| Aug 1, 4:51 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Aug 3, 6:42 PM EDT | Special Weather Statement | FFC | 33 min |
| Aug 3, 6:51 PM EDT | Severe Thunderstorm Warning | FFC | 39 min |
| Aug 3, 7:59 PM EDT | Special Weather Statement | FFC | 46 min |
| Aug 8, 7:16 PM EDT | Special Weather Statement | FFC | 29 min |
| Aug 8, 7:41 PM EDT | Special Weather Statement | FFC | 34 min |
| Aug 9, 1:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 9, 4:10 PM EDT | Special Weather Statement | FFC | 35 min |
| Aug 9, 4:34 PM EDT | Special Weather Statement | FFC | 26 min |
| Aug 10, 7:18 PM EDT | Special Weather Statement | FFC | 27 min |
| Aug 11, 1:52 AM EDT | Special Weather Statement | FFC | 38 min |
| Aug 11, 2:53 AM EDT | Special Weather Statement | FFC | 37 min |
| Aug 24, 2:36 AM EDT | Special Weather Statement | FFC | 39 min |
| Sep 8, 2:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Sep 17, 6:39 PM EDT | Tornado Watch | SPC | 8 hr |
| Sep 17, 8:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 7:54 AM EDT | Dense Fog Advisory | FFC | 2 hr |
| Oct 1, 1:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Oct 1, 2:16 PM EDT | Tornado Watch | SPC | 7 hr |
| Oct 1, 4:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 1, 6:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Oct 1, 10:45 PM EDT | Special Weather Statement | FFC | 60 min |
| Oct 1, 10:56 PM EDT | Flash Flood Warning | FFC | 6 hr |
| Oct 2, 1:18 AM EDT | River Flood Warning | FFC | 3 hr |
| Oct 2, 1:18 AM EDT | River Flood Warning | FFC | 6 hr |
| Oct 2, 4:10 AM EDT | River Flood Warning | FFC | 6 hr |
| Oct 2, 6:41 AM EDT | River Flood Warning | FFC | 18 hr |
| Oct 28, 11:28 AM EDT | Wind Advisory | FFC | 63 hr |
| Nov 7, 2:56 PM EST | Frost Advisory | FFC | 18 hr |
| Nov 8, 1:46 PM EST | Frost Advisory | FFC | 19 hr |
| Nov 13, 4:04 AM EST | Frost Advisory | FFC | 26 hr |
| Nov 16, 3:34 PM EST | Frost Advisory | FFC | 16 hr |
| Dec 19, 3:01 PM EST | Wind Advisory | FFC | 64 hr |
| Dec 24, 6:23 PM EST | Dense Fog Advisory | FFC | 16 hr |
| Dec 25, 3:08 PM EST | Wind Advisory | FFC | 31 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 12 |
| Tornado Warning | 3 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 31 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 5 |
| Flash Flood Watch | 1 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 11 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe 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.