Alert archive / Georgia / Seminole County
Weather alerts in Seminole County, Georgia, 2020
131 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Seminole County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 131
- Warnings
- 44
- Watches
- 18
- Advisories
- 20
- Busiest month
- April27 alerts
- Busiest day
- April 23, 202013 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Seminole County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 31 | 27 | 13% | 3 | 100% | 34 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 84 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Tallahassee, FL: tornado warnings | 79 | 23 | 71% | 40 | 83% | 15 min |
| NWS Tallahassee, FL: severe thunderstorm warnings | 244 | 178 | 27% | 623 | 93% | 32 min |
| NWS Tallahassee, FL: flash flood warnings | 37 | 35 | 5% | 105 | 96% | 547 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 10, 8:27 PM EST | Wind Advisory | TAE | 25 hr |
| Jan 11, 3:26 PM EST | Mesoscale Discussion | SPC | 94 min |
| Jan 11, 3:44 PM EST | Tornado Watch | SPC | 5 hr |
| Jan 11, 6:21 PM EST | Mesoscale Discussion | SPC | 114 min |
| Jan 11, 6:38 PM EST | Severe Thunderstorm Warning | TAE | 67 min |
| Jan 11, 7:43 PM EST | Severe Thunderstorm Warning | TAE | 47 min |
| Jan 12, 7:26 PM EST | Dense Fog Advisory | TAE | 14 hr |
| Jan 14, 12:46 AM EST | Dense Fog Advisory | TAE | 8 hr |
| Jan 14, 10:46 PM EST | Dense Fog Advisory | TAE | 12 hr |
| Jan 16, 1:16 AM EST | Dense Fog Advisory | TAE | 8 hr |
| Feb 5, 2:53 AM EST | Flash Flood Watch | TAE | 39 hr |
| Feb 6, 1:29 AM EST | Wind Advisory | TAE | 20 hr |
| Feb 6, 3:02 AM EST | Mesoscale Discussion | SPC | 88 min |
| Feb 6, 4:27 AM EST | Tornado Watch | SPC | 9 hr |
| Feb 6, 11:00 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 6, 12:17 PM EST | Tornado Watch | SPC | 8 hr |
| Feb 6, 2:32 PM EST | Mesoscale Discussion | SPC | 58 min |
| Feb 6, 2:58 PM EST | Severe Thunderstorm Warning | TAE | 62 min |
| Feb 6, 4:02 PM EST | Severe Thunderstorm Warning | TAE | 58 min |
| Feb 7, 2:49 PM EST | River Flood Warning | TAE | 46 hr |
| Feb 8, 3:40 PM EST | River Flood Warning | TAE | 3 days |
| Feb 11, 10:33 PM EST | Dense Fog Advisory | TAE | 13 hr |
| Feb 13, 10:41 AM EST | Special Weather Statement | TAE | 34 min |
| Feb 17, 6:46 PM EST | Dense Fog Advisory | TAE | 15 hr |
| Feb 20, 11:33 PM EST | River Flood Warning | TAE | 69 hr |
| Mar 3, 2:40 PM EST | Flash Flood Watch | TAE | 48 hr |
| Mar 4, 7:37 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 4, 10:16 AM EST | Tornado Watch | SPC | 6 hr |
| Mar 4, 12:34 PM EST | Mesoscale Discussion | SPC | 86 min |
| Mar 5, 3:26 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Mar 5, 6:30 AM EST | River Flood Warning | TAE | 4 days |
| Mar 11, 3:24 AM EDT | Dense Fog Advisory | TAE | 8 hr |
| Mar 13, 4:09 AM EDT | Dense Fog Advisory | TAE | 6 hr |
| Mar 14, 4:09 AM EDT | Dense Fog Advisory | TAE | 7 hr |
| Mar 18, 5:22 AM EDT | Dense Fog Advisory | TAE | 5 hr |
| Mar 27, 5:12 AM EDT | Dense Fog Advisory | TAE | 5 hr |
| Mar 28, 5:23 AM EDT | Dense Fog Advisory | TAE | 5 hr |
| Mar 30, 2:12 PM EDT | Wind Advisory | TAE | 30 hr |
| Mar 31, 9:51 AM EDT | Tornado Watch | SPC | 6 hr |
| Mar 31, 11:42 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Mar 31, 12:50 PM EDT | Severe Thunderstorm Warning | TAE | 25 min |
| Mar 31, 1:05 PM EDT | Severe Thunderstorm Warning | TAE | 55 min |
| Mar 31, 1:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Mar 31, 1:14 PM EDT | Severe Thunderstorm Warning | TAE | 61 min |
| Mar 31, 1:43 PM EDT | Severe Thunderstorm Warning | TAE | 62 min |
| Mar 31, 2:12 PM EDT | Severe Thunderstorm Warning | TAE | 63 min |
| Apr 8, 6:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Apr 8, 7:29 PM EDT | Severe Thunderstorm Warning | TAE | 46 min |
| Apr 11, 2:40 PM EDT | Wind Advisory | TAE | 41 hr |
| Apr 12, 11:45 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 13, 4:09 AM EDT | Severe Thunderstorm Warning | TAE | 66 min |
| Apr 13, 5:04 AM EDT | Severe Thunderstorm Warning | TAE | 56 min |
| Apr 19, 10:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 19, 11:13 PM EDT | Tornado Watch | SPC | 10 hr |
| Apr 20, 12:49 AM EDT | Severe Thunderstorm Warning | TAE | 56 min |
| Apr 20, 1:26 AM EDT | Severe Thunderstorm Warning | TAE | 34 min |
| Apr 20, 1:52 AM EDT | Severe Thunderstorm Warning | TAE | 68 min |
| Apr 21, 5:20 PM EDT | River Flood Warning | TAE | 4 hr |
| Apr 22, 6:42 AM EDT | River Flood Warning | TAE | 51 hr |
| Apr 23, 8:43 AM EDT | Mesoscale Discussion | SPC | 92 min |
| Apr 23, 10:29 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 23, 10:52 AM EDT | Tornado Watch | SPC | 6 hr |
| Apr 23, 10:58 AM EDT | Severe Thunderstorm Warning | TAE | 47 min |
| Apr 23, 11:41 AM EDT | Severe Thunderstorm Warning | TAE | 64 min |
| Apr 23, 3:15 PM EDT | Severe Thunderstorm Warning | TAE | 30 min |
| Apr 23, 3:42 PM EDT | Severe Thunderstorm Warning | TAE | 48 min |
| Apr 23, 3:47 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 23, 4:19 PM EDT | Severe Thunderstorm Warning | TAE | 56 min |
| Apr 23, 4:46 PM EDT | Flash Flood Warning | TAE | 3 hr |
| Apr 23, 5:06 PM EDT | Severe Thunderstorm Warning | TAE | 39 min |
| Apr 23, 5:44 PM EDT | Severe Thunderstorm Warning | TAE | 61 min |
| Apr 23, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 29, 7:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 3:05 PM EDT | Special Weather Statement | TAE | 40 min |
| May 22, 4:31 PM EDT | Severe Thunderstorm Warning | TAE | 29 min |
| May 27, 7:08 PM EDT | Special Weather Statement | TAE | 52 min |
| Jun 6, 2:29 AM EDT | Flash Flood Watch | TAE | 42 hr |
| Jun 9, 3:50 PM EDT | Special Weather Statement | TAE | 25 min |
| Jun 23, 11:44 AM EDT | Special Weather Statement | TAE | 46 min |
| Jun 23, 12:00 PM EDT | Severe Thunderstorm Warning | TAE | 30 min |
| Jun 23, 12:29 PM EDT | Severe Thunderstorm Warning | TAE | 61 min |
| Jun 24, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 6:27 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 25, 2:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 3:10 PM EDT | Special Weather Statement | TAE | 50 min |
| Jul 1, 1:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 1, 2:29 PM EDT | Severe Thunderstorm Warning | TAE | 46 min |
| Jul 1, 2:37 PM EDT | Special Weather Statement | TAE | 38 min |
| Jul 1, 2:53 PM EDT | Severe Thunderstorm Warning | TAE | 37 min |
| Jul 10, 3:43 AM EDT | Heat Advisory | TAE | 16 hr |
| Jul 10, 4:52 PM EDT | Special Weather Statement | TAE | 38 min |
| Jul 10, 5:26 PM EDT | Special Weather Statement | TAE | 34 min |
| Jul 12, 7:15 PM EDT | Special Weather Statement | TAE | 90 min |
| Jul 12, 8:38 PM EDT | Special Weather Statement | TAE | 52 min |
| Jul 21, 1:32 PM EDT | Special Weather Statement | TAE | 28 min |
| Jul 22, 1:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 5:10 PM EDT | Severe Thunderstorm Warning | TAE | 80 min |
| Jul 23, 12:09 PM EDT | Special Weather Statement | TAE | 66 min |
| Jul 23, 1:35 PM EDT | Special Weather Statement | TAE | 55 min |
| Aug 10, 6:40 PM EDT | Special Weather Statement | TAE | 50 min |
| Aug 11, 2:08 PM EDT | Special Weather Statement | TAE | 52 min |
| Aug 18, 5:17 PM EDT | Special Weather Statement | TAE | 28 min |
| Aug 19, 12:31 AM EDT | Special Weather Statement | TAE | 44 min |
| Aug 19, 6:56 PM EDT | Severe Thunderstorm Warning | TAE | 49 min |
| Aug 19, 7:18 PM EDT | Severe Thunderstorm Warning | TAE | 27 min |
| Aug 19, 7:44 PM EDT | Special Weather Statement | TAE | 46 min |
| Aug 19, 7:53 PM EDT | Severe Thunderstorm Warning | TAE | 25 min |
| Aug 24, 3:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 24, 4:39 PM EDT | Tornado Watch | SPC | 8 hr |
| Aug 24, 9:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Sep 11, 5:39 PM EDT | Special Weather Statement | TAE | 66 min |
| Sep 12, 2:55 PM EDT | Flash Flood Watch | TAE | 5 days |
| Sep 14, 5:12 PM EDT | Special Weather Statement | TAE | 48 min |
| Sep 16, 5:14 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 16, 6:55 AM EDT | Tornado Watch | SPC | 14 hr |
| Sep 16, 12:06 PM EDT | Flash Flood Warning | TAE | 16 hr |
| Sep 16, 11:29 PM EDT | Areal Flood Warning | TAE | 11 hr |
| Sep 17, 3:31 AM EDT | Areal Flood Warning | TAE | 7 hr |
| Oct 29, 12:34 AM EDT | Tornado Watch | SPC | 7 hr |
| Oct 29, 3:11 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Oct 29, 5:16 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Nov 26, 9:29 PM EST | Dense Fog Advisory | TAE | 12 hr |
| Nov 30, 2:39 AM EST | Freeze Warning | TAE | 30 hr |
| Nov 30, 2:01 PM EST | Freeze Watch | TAE | 13 hr |
| Dec 1, 2:43 AM EST | Freeze Warning | TAE | 30 hr |
| Dec 4, 2:37 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 10, 2:15 PM EST | Dense Fog Advisory | TAE | 20 hr |
| Dec 12, 11:38 PM EST | Dense Fog Advisory | TAE | 10 hr |
| Dec 24, 9:23 AM EST | Special Weather Statement | TAE | 97 min |
| Dec 24, 10:58 AM EST | Special Weather Statement | TAE | 92 min |
| Dec 25, 1:31 PM EST | Hard Freeze Warning | TAE | 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 | 31 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 12 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 23 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| River Flood Warning | 6 |
| Flash Flood Watch | 4 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Hard Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 15 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.