Alert archive / Tennessee / Decatur County
Weather alerts in Decatur County, Tennessee, 2020
154 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Decatur County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 154
- Warnings
- 37
- Watches
- 20
- Advisories
- 64
- Busiest month
- April26 alerts
- Busiest day
- April 13, 20208 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 3 tornado warnings covering Decatur County in 2020 had a tornado report inside them.
Decatur County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 0 | ||
| Severe thunderstorm warnings | 16 | 10 | 38% | 9 | 100% | 15 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 65 | 20 | 69% | 47 | 72% | 10 min |
| NWS Memphis, TN: severe thunderstorm warnings | 221 | 133 | 40% | 420 | 80% | 25 min |
| NWS Memphis, TN: flash flood warnings | 36 | 17 | 53% | 41 | 73% | 73 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 31, 11:41 PM CST | River Flood Advisory | OHX | 23 days |
| Jan 1, 3:14 AM CST | Flood Watch | MEG | 57 hr |
| Jan 1, 1:03 PM CST | River Flood Advisory | MEG | 21 days |
| Jan 9, 3:49 PM CST | Flash Flood Watch | MEG | 47 hr |
| Jan 10, 3:26 AM CST | Wind Advisory | MEG | 31 hr |
| Jan 11, 4:17 AM CST | Tornado Watch | SPC | 6 hr |
| Jan 11, 6:41 AM CST | Severe Thunderstorm Warning | MEG | 47 min |
| Jan 14, 12:17 AM CST | Special Weather Statement | MEG | 28 min |
| Jan 15, 3:11 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 23, 12:33 PM CST | River Flood Advisory | MEG | 4 days |
| Jan 27, 6:11 PM CST | River Flood Advisory | MEG | 27 hr |
| Feb 4, 12:51 PM CST | River Flood Advisory | MEG | 26 hr |
| Feb 5, 3:16 PM CST | River Flood Warning | MEG | 31 days |
| Feb 5, 4:37 PM CST | River Flood Warning | MEG | 22 days |
| Feb 6, 6:01 AM CST | River Flood Advisory | OHX | 10 hr |
| Feb 6, 3:58 PM CST | River Flood Warning | OHX | 20 days |
| Feb 6, 7:27 PM CST | Winter Weather Advisory | MEG | 13 hr |
| Feb 9, 3:05 AM CST | Flood Watch | MEG | 4 days |
| Feb 12, 8:20 PM CST | Areal Flood Warning | MEG | 6 hr |
| Feb 26, 4:27 PM CST | River Flood Advisory | OHX | 12 days |
| Mar 2, 11:10 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 3, 12:59 AM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 3, 1:38 AM CST | Severe Thunderstorm Warning | MEG | 30 min |
| Mar 3, 2:34 AM CST | Mesoscale Discussion | SPC | 116 min |
| Mar 12, 1:25 PM CDT | River Flood Advisory | MEG | 3 days |
| Mar 15, 1:43 PM CDT | River Flood Warning | MEG | 72 hr |
| Mar 18, 1:20 PM CDT | River Flood Advisory | MEG | 3 days |
| Mar 20, 2:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Mar 20, 1:00 PM CDT | Areal Flood Advisory | MEG | 5 hr |
| Mar 21, 1:37 PM CDT | River Flood Warning | MEG | 13 days |
| Mar 24, 7:24 AM CDT | River Flood Advisory | OHX | 24 hr |
| Mar 24, 11:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 24, 2:08 PM CDT | River Flood Warning | MEG | 11 days |
| Mar 24, 2:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Mar 24, 3:06 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 25, 7:24 AM CDT | River Flood Warning | OHX | 8 days |
| Mar 28, 4:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Mar 28, 6:34 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 28, 8:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Mar 28, 9:36 PM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| Mar 28, 9:37 PM CDT | Severe Thunderstorm Warning | MEG | 53 min |
| Mar 28, 10:15 PM CDT | Special Weather Statement | MEG | 45 min |
| Apr 2, 6:42 PM CDT | River Flood Advisory | OHX | 58 hr |
| Apr 4, 1:30 PM CDT | River Flood Advisory | MEG | 57 hr |
| Apr 4, 1:30 PM CDT | River Flood Advisory | MEG | 34 hr |
| Apr 8, 3:13 PM CDT | Severe Thunderstorm Warning | MEG | 47 min |
| Apr 8, 3:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Apr 8, 7:04 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 9, 9:42 PM CDT | River Flood Warning | MEG | 16 days |
| Apr 10, 3:20 PM CDT | Frost Advisory | MEG | 16 hr |
| Apr 12, 3:56 AM CDT | Flash Flood Watch | MEG | 20 hr |
| Apr 12, 3:57 AM CDT | Wind Advisory | MEG | 26 hr |
| Apr 12, 10:59 AM CDT | River Flood Warning | MEG | 21 days |
| Apr 12, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 12, 9:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 12, 11:09 PM CDT | Severe Thunderstorm Warning | MEG | 66 min |
| Apr 12, 11:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 13, 1:43 AM CDT | High Wind Warning | MEG | 4 hr |
| Apr 13, 4:22 AM CDT | River Flood Warning | MEG | 21 days |
| Apr 13, 10:06 AM CDT | River Flood Warning | OHX | 6 days |
| Apr 13, 6:06 PM CDT | Freeze Watch | MEG | 24 hr |
| Apr 14, 2:06 PM CDT | Freeze Warning | MEG | 19 hr |
| Apr 15, 3:27 AM CDT | Freezing Fog Advisory | MEG | 5 hr |
| Apr 15, 3:17 PM CDT | Frost Advisory | MEG | 18 hr |
| Apr 19, 6:36 PM CDT | River Flood Advisory | OHX | 9 days |
| Apr 22, 1:01 PM CDT | River Flood Advisory | MEG | 50 hr |
| Apr 25, 11:06 AM CDT | Wind Advisory | MEG | 9 hr |
| Apr 28, 12:34 PM CDT | River Flood Advisory | MEG | 56 hr |
| May 3, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 3, 3:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| May 3, 3:31 PM CDT | Tornado Warning | MEG | 26 min |
| May 3, 3:35 PM CDT | Severe Thunderstorm Warning | MEG | 40 min |
| May 3, 5:54 PM CDT | Severe Thunderstorm Warning | MEG | 20 min |
| May 3, 6:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 3, 6:25 PM CDT | Special Weather Statement | MEG | 50 min |
| May 3, 6:34 PM CDT | Severe Thunderstorm Warning | MEG | 41 min |
| May 4, 2:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 4, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 4, 6:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| May 4, 6:26 PM CDT | Severe Thunderstorm Warning | MEG | 34 min |
| May 4, 7:01 PM CDT | Severe Thunderstorm Warning | MEG | 18 min |
| May 4, 7:11 PM CDT | Severe Thunderstorm Warning | MEG | 34 min |
| May 4, 7:45 PM CDT | Severe Thunderstorm Warning | MEG | 15 min |
| May 4, 7:48 PM CDT | Severe Thunderstorm Warning | MEG | 27 min |
| May 4, 7:53 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| May 4, 8:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 7, 3:19 PM CDT | Wind Advisory | MEG | 28 hr |
| May 8, 3:03 AM CDT | Frost Advisory | MEG | 29 hr |
| May 20, 4:35 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| May 22, 4:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 22, 6:19 PM CDT | Severe Thunderstorm Warning | MEG | 41 min |
| May 24, 1:45 PM CDT | River Flood Advisory | MEG | 8 days |
| May 28, 2:28 AM CDT | River Flood Advisory | MEG | 5 days |
| May 28, 12:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 4, 6:43 PM CDT | Tornado Warning | MEG | 32 min |
| Jun 4, 7:14 PM CDT | Tornado Warning | MEG | 46 min |
| Jun 5, 11:03 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 10:13 AM CDT | Areal Flood Warning | MEG | 4 min |
| Jun 9, 10:17 AM CDT | Flash Flood Warning | MEG | 3 hr |
| Jun 25, 3:49 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| Jun 30, 2:56 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jun 30, 3:09 PM CDT | Special Weather Statement | MEG | 21 min |
| Jun 30, 4:45 PM CDT | Special Weather Statement | MEG | 30 min |
| Jun 30, 8:36 PM CDT | Special Weather Statement | MEG | 39 min |
| Jun 30, 9:25 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jun 30, 10:56 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 1, 8:45 AM CDT | Special Weather Statement | MEG | 30 min |
| Jul 1, 11:26 AM CDT | Flash Flood Watch | MEG | 17 hr |
| Jul 2, 4:11 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Jul 2, 12:07 PM CDT | River Flood Advisory | MEG | 48 hr |
| Jul 5, 5:12 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 8, 6:24 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jul 8, 7:30 PM CDT | Areal Flood Advisory | MEG | 60 min |
| Jul 12, 6:56 AM CDT | Special Weather Statement | MEG | 34 min |
| Jul 12, 8:22 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 12, 8:32 AM CDT | Special Weather Statement | MEG | 43 min |
| Jul 12, 8:41 AM CDT | Severe Thunderstorm Warning | MEG | 34 min |
| Jul 15, 2:23 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 21, 7:04 PM CDT | Special Weather Statement | MEG | 41 min |
| Aug 2, 1:21 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Aug 9, 3:29 PM CDT | Heat Advisory | MEG | 28 hr |
| Aug 11, 12:01 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Aug 12, 5:00 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Aug 15, 3:15 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| Aug 22, 2:12 AM CDT | Dense Fog Advisory | MEG | 7 hr |
| Aug 23, 3:00 AM CDT | Dense Fog Advisory | MEG | 7 hr |
| Aug 26, 9:53 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Aug 27, 1:04 AM CDT | Flash Flood Watch | MEG | 51 hr |
| Aug 27, 2:33 AM CDT | Wind Advisory | MEG | 37 hr |
| Aug 28, 10:09 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 28, 10:31 AM CDT | Tornado Watch | SPC | 5 hr |
| Aug 29, 3:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 30, 3:15 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 31, 12:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Sep 1, 4:59 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| Sep 1, 4:55 PM CDT | Flash Flood Warning | MEG | 2 hr |
| Sep 2, 5:58 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Sep 12, 10:07 AM CDT | Areal Flood Advisory | MEG | 68 min |
| Sep 12, 11:19 AM CDT | Areal Flood Advisory | MEG | 86 min |
| Sep 13, 2:59 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| Sep 13, 3:48 AM CDT | Flash Flood Watch | MEG | 11 hr |
| Sep 13, 6:31 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Sep 13, 9:38 AM CDT | Areal Flood Advisory | MEG | 112 min |
| Oct 9, 3:07 AM CDT | Flash Flood Watch | MEG | 36 hr |
| Oct 12, 12:28 AM CDT | Dense Fog Advisory | MEG | 9 hr |
| Oct 16, 9:42 AM CDT | Frost Advisory | MEG | 22 hr |
| Oct 23, 1:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 28, 4:52 PM CDT | River Flood Advisory | MEG | 45 hr |
| Oct 30, 1:34 PM CDT | Frost Advisory | MEG | 19 hr |
| Oct 31, 2:45 PM CDT | Freeze Watch | MEG | 13 hr |
| Nov 1, 3:05 AM CST | Freeze Warning | MEG | 30 hr |
| Nov 14, 7:19 PM CST | Wind Advisory | MEG | 15 hr |
| Nov 23, 5:41 AM CST | Freezing Fog Advisory | MEG | 2 hr |
| Nov 24, 2:03 PM CST | Wind Advisory | MEG | 24 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 | 16 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| River Flood Warning | 11 |
| Flash Flood Watch | 6 |
| Flood Watch | 2 |
| Areal Flood Advisory | 17 |
| River Flood Advisory | 20 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
| Freezing Fog Advisory | 2 |
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.