Alert archive / Georgia / Jefferson County
Weather alerts in Jefferson County, Georgia, 2009
132 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 132
- Warnings
- 45
- Watches
- 30
- Advisories
- 26
- Busiest month
- February28 alerts
- Busiest day
- February 19, 20097 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Jefferson County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 22 minutes after it went out.
Jefferson County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 1 | 100% | 22 min |
| Severe thunderstorm warnings | 9 | 1 | 89% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: tornado warnings | 131 | 26 | 80% | 58 | 84% | 24 min |
| NWS Atlanta, GA: severe thunderstorm warnings | 468 | 174 | 63% | 500 | 64% | 24 min |
| NWS Atlanta, GA: flash flood warnings | 58 | 23 | 60% | 51 | 65% | 150 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 3, 5:16 AM EST | Dense Fog Advisory | FFC | 9 hr |
| Jan 7, 2:32 AM EST | Mesoscale Discussion | SPC | 118 min |
| Jan 7, 3:56 AM EST | Wind Advisory | FFC | 18 hr |
| Jan 7, 4:29 AM EST | Mesoscale Discussion | SPC | 91 min |
| Jan 9, 3:00 AM EST | Red Flag Warning | FFC | 15 hr |
| Jan 13, 3:42 AM EST | Red Flag Warning | FFC | 39 hr |
| Jan 14, 3:46 PM EST | Fire Weather Watch | FFC | 12 hr |
| Jan 14, 3:46 PM EST | Red Flag Warning | FFC | 26 hr |
| Jan 15, 3:57 AM EST | Red Flag Warning | FFC | 42 hr |
| Jan 15, 3:30 PM EST | Red Flag Warning | FFC | 51 hr |
| Jan 19, 3:56 PM EST | Wind Advisory | FFC | 27 hr |
| Jan 20, 2:20 PM EST | Fire Weather Watch | FFC | 25 hr |
| Jan 20, 2:20 PM EST | Red Flag Warning | FFC | 28 hr |
| Jan 21, 3:39 PM EST | Red Flag Warning | FFC | 26 hr |
| Jan 26, 7:05 PM EST | Dense Fog Advisory | FFC | 14 hr |
| Feb 3, 3:40 AM EST | Wind Advisory | FFC | 37 hr |
| Feb 3, 2:23 PM EST | Fire Weather Watch | FFC | 25 hr |
| Feb 3, 2:23 PM EST | Red Flag Warning | FFC | 29 hr |
| Feb 4, 3:17 PM EST | Red Flag Warning | FFC | 29 hr |
| Feb 5, 3:08 PM EST | Red Flag Warning | FFC | 29 hr |
| Feb 6, 4:12 AM EST | Red Flag Warning | FFC | 38 hr |
| Feb 10, 5:04 PM EST | Wind Advisory | FFC | 28 hr |
| Feb 12, 4:46 AM EST | Red Flag Warning | FFC | 13 hr |
| Feb 13, 4:12 AM EST | Red Flag Warning | FFC | 15 hr |
| Feb 18, 3:32 PM EST | Tornado Watch | SPC | 7 hr |
| Feb 18, 3:52 PM EST | Wind Advisory | FFC | 27 hr |
| Feb 18, 6:26 PM EST | Mesoscale Discussion | SPC | 94 min |
| Feb 18, 7:53 PM EST | Tornado Warning | FFC | 56 min |
| Feb 18, 8:58 PM EST | Mesoscale Discussion | SPC | 92 min |
| Feb 18, 10:14 PM EST | Severe Thunderstorm Watch | SPC | 6 hr |
| Feb 18, 10:46 PM EST | Severe Thunderstorm Warning | FFC | 44 min |
| Feb 18, 10:48 PM EST | Tornado Warning | FFC | 42 min |
| Feb 18, 11:11 PM EST | Severe Thunderstorm Warning | FFC | 45 min |
| Feb 18, 11:55 PM EST | Mesoscale Discussion | SPC | 95 min |
| Feb 20, 2:03 PM EST | Red Flag Warning | FFC | 28 hr |
| Feb 21, 2:04 PM EST | Fire Weather Watch | FFC | 14 hr |
| Feb 22, 4:14 AM EST | Red Flag Warning | FFC | 15 hr |
| Feb 22, 1:41 PM EST | Fire Weather Watch | FFC | 24 hr |
| Feb 22, 1:41 PM EST | Red Flag Warning | FFC | 29 hr |
| Feb 23, 2:02 PM EST | Red Flag Warning | FFC | 29 hr |
| Feb 28, 8:25 AM EST | Tornado Watch | SPC | 3 hr |
| Feb 28, 11:39 AM EST | Tornado Watch | SPC | 7 hr |
| Feb 28, 3:20 PM EST | Wind Advisory | FFC | 31 hr |
| Mar 16, 3:56 PM EDT | Dense Fog Advisory | FFC | 13 hr |
| Mar 22, 4:04 AM EDT | Red Flag Warning | FFC | 15 hr |
| Mar 28, 10:20 AM EDT | Tornado Watch | SPC | 8 hr |
| Mar 28, 11:51 AM EDT | Mesoscale Discussion | SPC | 54 min |
| Mar 28, 1:07 PM EDT | Wind Advisory | FFC | 31 hr |
| Apr 2, 4:12 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 2, 12:57 PM EDT | River Flood Warning | FFC | 17 hr |
| Apr 2, 4:22 PM EDT | Wind Advisory | FFC | 24 hr |
| Apr 3, 12:59 AM EDT | Areal Flood Warning | FFC | 12 hr |
| Apr 3, 11:53 AM EDT | River Flood Warning | FFC | 6 hr |
| Apr 5, 4:15 AM EDT | Wind Advisory | FFC | 63 hr |
| Apr 5, 10:29 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Apr 6, 4:56 PM EDT | Freeze Watch | FFC | 12 hr |
| Apr 7, 4:40 AM EDT | Freeze Warning | FFC | 29 hr |
| Apr 10, 6:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 10, 6:31 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 10:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Apr 10, 10:52 PM EDT | Severe Thunderstorm Warning | FFC | 37 min |
| Apr 10, 11:38 PM EDT | Severe Thunderstorm Warning | FFC | 67 min |
| Apr 10, 11:53 PM EDT | Tornado Warning | FFC | 37 min |
| Apr 11, 12:44 AM EDT | Severe Thunderstorm Warning | FFC | 18 min |
| Apr 11, 12:49 AM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 14, 10:03 AM EDT | Severe Thunderstorm Warning | FFC | 42 min |
| Apr 14, 11:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 16, 2:21 PM EDT | Fire Weather Watch | FFC | 13 hr |
| Apr 17, 3:38 AM EDT | Red Flag Warning | FFC | 16 hr |
| Apr 17, 4:12 PM EDT | Fire Weather Watch | FFC | 11 hr |
| Apr 21, 1:45 PM EDT | Red Flag Warning | FFC | 5 hr |
| Apr 21, 3:20 PM EDT | Fire Weather Watch | FFC | 12 hr |
| Apr 21, 7:21 PM EDT | High Wind Warning | FFC | 2 hr |
| Apr 22, 3:36 AM EDT | Red Flag Warning | FFC | 16 hr |
| May 2, 2:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 3, 4:42 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 3, 6:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 4, 2:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 4, 2:26 PM EDT | Tornado Warning | FFC | 49 min |
| May 4, 2:39 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 3:02 PM EDT | Severe Thunderstorm Warning | FFC | 19 min |
| May 6, 1:51 PM EDT | Areal Flood Warning | FFC | 12 hr |
| May 6, 5:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 6, 11:28 PM EDT | Areal Flood Warning | FFC | 24 hr |
| May 18, 3:50 PM EDT | Wind Advisory | FFC | 28 hr |
| May 19, 3:18 AM EDT | Red Flag Warning | FFC | 16 hr |
| May 20, 3:20 AM EDT | Red Flag Warning | FFC | 15 hr |
| May 20, 3:44 AM EDT | Wind Advisory | FFC | 14 hr |
| May 20, 2:43 PM EDT | Wind Advisory | FFC | 28 hr |
| Jun 17, 3:17 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 10:32 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 18, 1:13 AM EDT | Severe Thunderstorm Warning | FFC | 77 min |
| Jun 18, 1:21 AM EDT | Mesoscale Discussion | SPC | 24 min |
| Jun 18, 1:39 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 6:02 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 18, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 19, 4:19 PM EDT | Heat Advisory | FFC | 53 hr |
| Jun 22, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 3:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 22, 7:01 PM EDT | Severe Thunderstorm Warning | FFC | 44 min |
| Jun 27, 2:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 27, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 4:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 7:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 30, 3:21 AM EDT | Red Flag Warning | FFC | 17 hr |
| Jul 5, 2:06 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 7:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 7, 6:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 8, 1:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 11, 2:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 30, 1:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 17, 1:20 PM EDT | Flood Watch | FFC | 5 days |
| Oct 12, 3:46 AM EDT | Flood Watch | FFC | 18 hr |
| Oct 13, 3:52 AM EDT | Flash Flood Watch | FFC | 29 hr |
| Oct 19, 4:48 AM EDT | Frost Advisory | FFC | 28 hr |
| Nov 6, 2:47 PM EST | Frost Advisory | FFC | 18 hr |
| Nov 10, 2:55 AM EST | Wind Advisory | FFC | 32 hr |
| Nov 18, 9:20 PM EST | Dense Fog Advisory | FFC | 12 hr |
| Dec 1, 12:43 PM EST | Wind Advisory | FFC | 33 hr |
| Dec 1, 4:04 PM EST | Flood Watch | FFC | 25 hr |
| Dec 2, 10:32 AM EST | Tornado Watch | SPC | 6 hr |
| Dec 2, 1:31 PM EST | Mesoscale Discussion | SPC | 89 min |
| Dec 8, 4:36 AM EST | Wind Advisory | FFC | 37 hr |
| Dec 10, 3:15 PM EST | Red Flag Warning | FFC | 27 hr |
| Dec 11, 3:55 PM EST | Flood Watch | FFC | 36 hr |
| Dec 13, 3:37 PM EST | Dense Fog Advisory | FFC | 18 hr |
| Dec 14, 3:42 PM EST | Dense Fog Advisory | FFC | 12 hr |
| Dec 17, 4:35 AM EST | Flood Watch | FFC | 40 hr |
| Dec 18, 3:58 AM EST | Wind Advisory | FFC | 12 hr |
| Dec 23, 3:56 PM EST | Wind Advisory | FFC | 39 hr |
| Dec 25, 4:41 AM EST | Mesoscale Discussion | SPC | 64 min |
| Dec 25, 5:01 AM EST | Tornado Watch | SPC | 9 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 | 9 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 31 |
| Flooding | |
| Areal Flood Warning | 3 |
| River Flood Warning | 2 |
| Flash Flood Watch | 1 |
| Flood Watch | 5 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 17 |
| Fire | |
| Red Flag Warning | 25 |
| Fire Weather Watch | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.