Alert archive / Georgia / Jefferson County
Weather alerts in Jefferson County, Georgia, 2018
101 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 101
- Warnings
- 14
- Watches
- 13
- Advisories
- 14
- Busiest month
- June24 alerts
- Busiest day
- March 20, 20186 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 2 | 75% | 4 | 100% | 18 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Atlanta, GA: tornado warnings | 25 | 7 | 72% | 14 | 71% | 10 min |
| NWS Atlanta, GA: severe thunderstorm warnings | 341 | 219 | 36% | 841 | 70% | 17 min |
| NWS Atlanta, GA: flash flood warnings | 50 | 28 | 44% | 93 | 67% | 109 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 15, 2:25 PM EST | Winter Weather Advisory | FFC | 46 hr |
| Feb 4, 10:53 AM EST | Special Weather Statement | FFC | 37 min |
| Mar 1, 3:43 AM EST | Wind Advisory | FFC | 14 hr |
| Mar 1, 2:05 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 1, 3:13 PM EST | Special Weather Statement | FFC | 47 min |
| Mar 1, 3:55 PM EST | Special Weather Statement | FFC | 50 min |
| Mar 7, 7:47 PM EST | Freeze Watch | FFC | 7 hr |
| Mar 8, 2:23 AM EST | Freeze Warning | FFC | 31 hr |
| Mar 12, 3:31 AM EDT | Wind Advisory | FFC | 22 hr |
| Mar 12, 3:01 PM EDT | Freeze Watch | FFC | 25 hr |
| Mar 13, 4:11 PM EDT | Freeze Watch | FFC | 18 hr |
| Mar 13, 4:11 PM EDT | Freeze Warning | FFC | 18 hr |
| Mar 14, 10:32 AM EDT | Freeze Warning | FFC | 23 hr |
| Mar 19, 9:08 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 20, 1:53 AM EDT | Severe Thunderstorm Warning | FFC | 52 min |
| Mar 20, 2:36 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Mar 20, 2:46 AM EDT | Severe Thunderstorm Warning | FFC | 44 min |
| Mar 20, 3:27 AM EDT | Special Weather Statement | FFC | 33 min |
| Mar 20, 3:32 PM EDT | Wind Advisory | FFC | 28 hr |
| Apr 15, 9:47 PM EDT | Wind Advisory | FFC | 24 hr |
| Apr 23, 9:25 AM EDT | Special Weather Statement | FFC | 65 min |
| Apr 23, 3:59 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 23, 8:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 18, 4:40 PM EDT | Special Weather Statement | FFC | 35 min |
| May 22, 5:52 PM EDT | Special Weather Statement | FFC | 38 min |
| May 23, 2:31 PM EDT | Flash Flood Watch | FFC | 20 hr |
| May 24, 12:12 PM EDT | Flash Flood Watch | FFC | 39 hr |
| May 25, 8:00 PM EDT | Special Weather Statement | FFC | 45 min |
| May 31, 9:01 PM EDT | Special Weather Statement | FFC | 29 min |
| May 31, 9:37 PM EDT | Special Weather Statement | FFC | 23 min |
| Jun 1, 5:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 2:10 PM EDT | Special Weather Statement | FFC | 35 min |
| Jun 2, 2:45 PM EDT | Special Weather Statement | FFC | 30 min |
| Jun 9, 7:34 PM EDT | Special Weather Statement | FFC | 26 min |
| Jun 11, 6:03 PM EDT | Severe Thunderstorm Warning | FFC | 27 min |
| Jun 15, 8:37 PM EDT | Special Weather Statement | FFC | 38 min |
| Jun 16, 6:07 PM EDT | Special Weather Statement | FFC | 23 min |
| Jun 16, 6:27 PM EDT | Special Weather Statement | FFC | 33 min |
| Jun 16, 6:57 PM EDT | Special Weather Statement | FFC | 33 min |
| Jun 22, 10:05 PM EDT | Special Weather Statement | FFC | 40 min |
| Jun 22, 10:40 PM EDT | Special Weather Statement | FFC | 50 min |
| Jun 23, 2:16 PM EDT | Special Weather Statement | FFC | 29 min |
| Jun 24, 4:23 AM EDT | Heat Advisory | FFC | 16 hr |
| Jun 24, 9:58 PM EDT | Special Weather Statement | FFC | 32 min |
| Jun 25, 4:26 AM EDT | Heat Advisory | FFC | 16 hr |
| Jun 25, 7:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 7:52 PM EDT | Special Weather Statement | FFC | 23 min |
| Jun 25, 8:18 PM EDT | Special Weather Statement | FFC | 27 min |
| Jun 26, 6:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 27, 6:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 9:04 PM EDT | Special Weather Statement | FFC | 56 min |
| Jun 28, 11:46 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 3, 4:11 PM EDT | Special Weather Statement | FFC | 49 min |
| Jul 3, 4:32 PM EDT | Severe Thunderstorm Warning | FFC | 43 min |
| Jul 3, 4:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 3, 5:29 PM EDT | Special Weather Statement | FFC | 46 min |
| Jul 12, 4:50 PM EDT | Special Weather Statement | FFC | 25 min |
| Jul 13, 1:19 PM EDT | Special Weather Statement | FFC | 41 min |
| Jul 13, 2:02 PM EDT | Special Weather Statement | FFC | 28 min |
| Jul 13, 2:29 PM EDT | Special Weather Statement | FFC | 31 min |
| Jul 21, 8:10 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 5:42 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 6:47 PM EDT | Severe Thunderstorm Warning | FFC | 43 min |
| Jul 29, 2:47 PM EDT | Special Weather Statement | FFC | 28 min |
| Jul 30, 8:25 PM EDT | Severe Thunderstorm Warning | FFC | 35 min |
| Aug 1, 1:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 1, 4:03 PM EDT | Special Weather Statement | FFC | 27 min |
| Aug 1, 4:32 PM EDT | Special Weather Statement | FFC | 13 min |
| Aug 2, 3:45 PM EDT | Special Weather Statement | FFC | 45 min |
| Aug 6, 2:45 PM EDT | Special Weather Statement | FFC | 30 min |
| Aug 6, 2:52 PM EDT | Severe Thunderstorm Warning | FFC | 53 min |
| Aug 7, 3:32 AM EDT | Heat Advisory | FFC | 15 hr |
| Aug 8, 9:04 PM EDT | Special Weather Statement | FFC | 26 min |
| Aug 8, 10:36 PM EDT | Special Weather Statement | FFC | 24 min |
| Aug 8, 10:58 PM EDT | Special Weather Statement | FFC | 32 min |
| Aug 9, 6:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 10, 6:01 PM EDT | Special Weather Statement | FFC | 44 min |
| Sep 11, 3:43 PM EDT | Special Weather Statement | FFC | 47 min |
| Sep 11, 4:34 PM EDT | Special Weather Statement | FFC | 41 min |
| Sep 27, 3:03 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 9, 3:57 AM EDT | Flash Flood Watch | FFC | 51 hr |
| Oct 9, 6:21 AM EDT | Tropical Storm Watch | FFC | 11 hr |
| Oct 9, 1:55 PM EDT | Tropical Storm Warning | FFC | 42 hr |
| Oct 10, 1:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 10, 2:44 PM EDT | Tornado Watch | SPC | 11 hr |
| Oct 10, 4:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Oct 10, 9:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 11, 12:14 AM EDT | Areal Flood Warning | FFC | 6 hr |
| Oct 21, 3:01 PM EDT | Frost Advisory | FFC | 17 hr |
| Nov 7, 4:45 PM EST | Mesoscale Discussion | SPC | 90 min |
| Nov 7, 6:58 PM EST | Special Weather Statement | FFC | 32 min |
| Nov 7, 7:28 PM EST | Special Weather Statement | FFC | 32 min |
| Nov 13, 2:20 PM EST | Flash Flood Watch | FFC | 41 hr |
| Nov 15, 3:28 AM EST | Freeze Warning | FFC | 29 hr |
| Nov 16, 2:18 PM EST | Frost Advisory | FFC | 19 hr |
| Nov 25, 12:10 AM EST | Dense Fog Advisory | FFC | 11 hr |
| Dec 2, 7:31 AM EST | Severe Thunderstorm Warning | FFC | 44 min |
| Dec 7, 12:45 PM EST | Flood Watch | FFC | 45 hr |
| Dec 8, 4:10 AM EST | Wind Advisory | FFC | 32 hr |
| Dec 21, 3:39 AM EST | Wind Advisory | FFC | 15 hr |
| Dec 30, 1:58 PM EST | Dense Fog Advisory | FFC | 19 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 | 8 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 43 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 3 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.