Alert archive / Tennessee / Shelby County
Weather alerts in Shelby County, Tennessee, 2020
151 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Shelby County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 151
- Warnings
- 38
- Watches
- 19
- Advisories
- 51
- Busiest month
- April26 alerts
- Busiest day
- January 11, 202010 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Shelby County in 2020 had a tornado report inside them.
Shelby County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 24 | 17 | 29% | 28 | 79% | 30 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 28 min |
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 |
|---|---|---|---|
| Jan 3, 11:22 AM CST | River Flood Advisory | MEG | 5 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 10, 4:53 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 12:16 PM CST | River Flood Advisory | MEG | 4 days |
| Jan 10, 11:58 PM CST | Tornado Watch | SPC | 7 hr |
| Jan 11, 3:06 AM CST | Severe Thunderstorm Warning | MEG | 39 min |
| Jan 11, 3:36 AM CST | Severe Thunderstorm Warning | MEG | 39 min |
| Jan 11, 3:52 AM CST | Mesoscale Discussion | SPC | 83 min |
| Jan 11, 4:09 AM CST | Severe Thunderstorm Warning | MEG | 51 min |
| Jan 11, 4:55 AM CST | Severe Thunderstorm Warning | MEG | 50 min |
| Jan 11, 5:01 AM CST | Tornado Warning | MEG | 29 min |
| Jan 11, 9:39 AM CST | River Flood Warning | MEG | 29 hr |
| Jan 11, 9:39 AM CST | River Flood Warning | MEG | 10 hr |
| Jan 11, 9:39 AM CST | River Flood Warning | MEG | 10 hr |
| Jan 14, 3:38 PM CST | River Flood Warning | MEG | 9 days |
| Jan 14, 6:56 PM CST | Dense Fog Advisory | MEG | 16 hr |
| Jan 15, 3:11 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 18, 12:20 PM CST | River Flood Advisory | MEG | 13 days |
| Feb 6, 7:27 PM CST | Winter Weather Advisory | MEG | 13 hr |
| Feb 8, 1:18 PM CST | River Flood Advisory | MEG | 4 days |
| Feb 9, 3:05 AM CST | Flood Watch | MEG | 4 days |
| Feb 12, 7:23 PM CST | River Flood Warning | MEG | 18 days |
| Feb 24, 12:20 PM CST | Mesoscale Discussion | SPC | 115 min |
| Mar 1, 11:05 PM CST | Areal Flood Advisory | MEG | 115 min |
| 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, 1:50 AM CST | Severe Thunderstorm Warning | MEG | 19 min |
| Mar 3, 2:34 AM CST | Mesoscale Discussion | SPC | 116 min |
| Mar 7, 10:30 AM CST | River Flood Advisory | MEG | 27 hr |
| Mar 12, 11:29 PM CDT | Special Weather Statement | MEG | 46 min |
| Mar 15, 3:43 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Mar 15, 6:24 AM CDT | River Flood Warning | MEG | 7 hr |
| Mar 18, 11:16 AM CDT | River Flood Advisory | MEG | 3 days |
| Mar 21, 11:13 AM CDT | River Flood Warning | MEG | 22 days |
| Mar 22, 11:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 24, 11:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 28, 4:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Mar 28, 6:34 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 28, 7:02 PM CDT | Severe Thunderstorm Warning | MEG | 43 min |
| Mar 28, 7:26 PM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Mar 28, 7:40 PM CDT | Severe Thunderstorm Warning | MEG | 35 min |
| Mar 28, 8:11 PM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Apr 8, 7:04 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 8, 9:00 PM CDT | Severe Thunderstorm Warning | MEG | 45 min |
| Apr 8, 9:36 PM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| Apr 8, 10:17 PM CDT | Severe Thunderstorm Warning | MEG | 28 min |
| 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, 7:02 AM CDT | Special Weather Statement | MEG | 43 min |
| Apr 12, 7:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| 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, 9:50 PM CDT | Severe Thunderstorm Warning | MEG | 40 min |
| Apr 12, 10:16 PM CDT | Severe Thunderstorm Warning | MEG | 44 min |
| Apr 13, 1:43 AM CDT | High Wind Warning | MEG | 4 hr |
| Apr 13, 12:12 PM CDT | River Flood Advisory | MEG | 8 hr |
| Apr 13, 6:06 PM CDT | Frost Advisory | MEG | 39 hr |
| Apr 13, 8:13 PM CDT | River Flood Warning | MEG | 6 hr |
| Apr 15, 10:54 AM CDT | River Flood Advisory | MEG | 13 days |
| Apr 22, 2:31 PM CDT | Wind Advisory | MEG | 13 hr |
| Apr 24, 5:45 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| Apr 25, 11:06 AM CDT | Wind Advisory | MEG | 9 hr |
| Apr 28, 12:29 PM CDT | River Flood Advisory | MEG | 12 days |
| Apr 28, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 11:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 29, 12:02 AM CDT | Severe Thunderstorm Warning | MEG | 28 min |
| Apr 29, 12:11 AM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Apr 29, 9:52 AM CDT | Wind Advisory | MEG | 8 hr |
| May 3, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 3, 2:48 PM CDT | Severe Thunderstorm Warning | MEG | 42 min |
| May 3, 4:10 PM CDT | Severe Thunderstorm Warning | MEG | 35 min |
| May 4, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 4, 3:36 PM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| May 4, 3:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| May 7, 3:19 PM CDT | Wind Advisory | MEG | 28 hr |
| May 22, 3:55 PM CDT | Severe Thunderstorm Warning | MEG | 50 min |
| May 22, 4:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 28, 12:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 28, 2:27 PM CDT | River Flood Advisory | MEG | 10 days |
| Jun 4, 5:53 PM CDT | Severe Thunderstorm Warning | MEG | 52 min |
| Jun 5, 10:38 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 11:03 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 12:50 PM CDT | Special Weather Statement | MEG | 25 min |
| Jun 5, 1:17 PM CDT | Special Weather Statement | MEG | 28 min |
| Jun 5, 1:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 5, 1:27 PM CDT | Severe Thunderstorm Warning | MEG | 48 min |
| Jun 5, 1:46 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jun 7, 2:38 AM CDT | Flash Flood Watch | MEG | 50 hr |
| Jun 7, 3:00 PM CDT | Wind Advisory | MEG | 52 hr |
| Jun 8, 5:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 6:10 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jun 9, 7:49 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jun 9, 8:57 AM CDT | Flash Flood Warning | MEG | 3 hr |
| Jun 22, 2:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 23, 12:01 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 3:16 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jun 25, 3:49 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| Jul 1, 11:26 AM CDT | Flash Flood Watch | MEG | 17 hr |
| Jul 1, 2:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 1, 3:54 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Jul 1, 4:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 1:16 PM CDT | Special Weather Statement | MEG | 44 min |
| Jul 5, 1:36 PM CDT | Special Weather Statement | MEG | 24 min |
| Jul 5, 7:07 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 14, 2:47 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 15, 2:23 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 16, 3:45 PM CDT | Special Weather Statement | MEG | 30 min |
| Jul 23, 12:04 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 23, 12:24 PM CDT | Special Weather Statement | MEG | 51 min |
| Aug 9, 3:29 PM CDT | Heat Advisory | MEG | 28 hr |
| Aug 11, 12:34 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 4:27 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Aug 13, 10:13 AM CDT | Areal Flood Advisory | MEG | 2 hr |
| Aug 21, 11:45 AM CDT | Areal Flood Advisory | MEG | 48 min |
| 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, 10:53 PM CDT | Areal Flood Advisory | MEG | 2 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 27, 2:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 27, 3:47 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 27, 5:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 27, 8:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 8:53 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Aug 28, 4:39 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Aug 28, 4:45 PM CDT | Heat Advisory | MEG | 26 hr |
| Aug 29, 3:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 31, 12:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Sep 1, 2:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 1, 5:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 1, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 2, 12:35 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 7:54 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Sep 13, 2:59 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| Oct 9, 3:07 AM CDT | Flash Flood Watch | MEG | 36 hr |
| Oct 10, 3:17 AM CDT | Wind Advisory | MEG | 13 hr |
| Oct 12, 12:28 AM CDT | Dense Fog Advisory | MEG | 9 hr |
| Oct 23, 1:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 28, 1:06 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Oct 28, 3:57 PM CDT | Areal Flood Advisory | MEG | 3 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 19, 4:17 AM CST | Red Flag Warning | MEG | 14 hr |
| Nov 23, 5:41 AM CST | Dense Fog Advisory | MEG | 2 hr |
| Nov 24, 2:03 PM CST | Wind Advisory | MEG | 24 hr |
| Nov 25, 4:15 AM CST | Special Weather Statement | MEG | 45 min |
| Nov 25, 5:05 AM CST | Special Weather Statement | MEG | 25 min |
| Dec 20, 3:05 AM CST | Dense Fog Advisory | MEG | 6 hr |
| Dec 23, 8:10 PM CST | Special Weather Statement | MEG | 50 min |
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 | 24 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 32 |
| Special Weather Statement | 11 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 8 |
| Flash Flood Watch | 6 |
| Flood Watch | 1 |
| Areal Flood Advisory | 15 |
| River Flood Advisory | 10 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 11 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
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.