Alert archive / Tennessee / McNairy County
Weather alerts in McNairy County, Tennessee, 2021
144 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
McNairy County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 144
- Warnings
- 31
- Watches
- 25
- Advisories
- 40
- Busiest month
- March41 alerts
- Busiest day
- March 31, 202110 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 3 tornado warnings covering McNairy County in 2021 had a tornado report inside them.
McNairy County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 14 | 7 | 50% | 6 | 83% | 21 min |
| Flash flood warnings | 3 | 3 | 0% | 2 | 50% | 72 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 83 | 35 | 58% | 62 | 89% | 22 min |
| NWS Memphis, TN: severe thunderstorm warnings | 223 | 111 | 50% | 326 | 72% | 22 min |
| NWS Memphis, TN: flash flood warnings | 92 | 56 | 39% | 111 | 86% | 108 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 22, 1:58 AM CST | Dense Fog Advisory | MEG | 6 hr |
| Jan 24, 6:14 PM CST | Dense Fog Advisory | MEG | 12 hr |
| Jan 25, 4:49 PM CST | Mesoscale Discussion | SPC | 86 min |
| Jan 25, 5:52 PM CST | Tornado Watch | SPC | 7 hr |
| Jan 25, 7:59 PM CST | Dense Fog Advisory | MEG | 13 hr |
| Jan 30, 2:46 PM CST | Wind Advisory | MEG | 8 hr |
| Feb 12, 12:40 AM CST | Winter Weather Advisory | MEG | 5 hr |
| Feb 12, 3:17 PM CST | Winter Storm Watch | MEG | 24 hr |
| Feb 13, 2:53 PM CST | Winter Storm Warning | MEG | 54 hr |
| Feb 15, 3:02 PM CST | Wind Chill Advisory | MEG | 21 hr |
| Feb 15, 8:48 PM CST | Winter Storm Watch | MEG | 19 hr |
| Feb 16, 4:15 AM CST | Winter Storm Warning | MEG | 53 hr |
| Feb 17, 1:00 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 17, 3:22 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 18, 9:07 AM CST | Winter Weather Advisory | MEG | 6 hr |
| Feb 27, 2:55 AM CST | Flood Watch | MEG | 56 hr |
| Feb 27, 6:06 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 27, 9:03 PM CST | Dense Fog Advisory | MEG | 7 hr |
| Feb 28, 1:01 PM CST | Mesoscale Discussion | SPC | 119 min |
| Feb 28, 2:22 PM CST | Tornado Watch | SPC | 8 hr |
| Feb 28, 4:40 PM CST | Mesoscale Discussion | SPC | 95 min |
| Feb 28, 6:27 PM CST | Mesoscale Discussion | SPC | 93 min |
| Feb 28, 8:09 PM CST | Areal Flood Warning | MEG | 6 hr |
| Mar 17, 5:34 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Mar 17, 5:53 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 17, 7:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Mar 17, 9:04 AM CDT | Flash Flood Warning | MEG | 3 hr |
| Mar 17, 12:59 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 17, 6:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Mar 17, 7:07 PM CDT | Tornado Watch | SPC | 3 hr |
| Mar 25, 2:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 25, 3:48 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 25, 5:16 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Mar 25, 5:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Mar 25, 5:56 PM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Mar 25, 6:14 PM CDT | Severe Thunderstorm Warning | MEG | 46 min |
| Mar 25, 6:28 PM CDT | Severe Thunderstorm Warning | MEG | 62 min |
| Mar 27, 2:05 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 27, 2:44 AM CDT | Flash Flood Watch | MEG | 24 hr |
| Mar 27, 7:00 AM CDT | Special Weather Statement | MEG | 30 min |
| Mar 27, 9:33 AM CDT | Flash Flood Warning | MEG | 5 hr |
| Mar 27, 11:55 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 27, 1:51 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 27, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Mar 27, 8:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Mar 27, 9:01 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 27, 10:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 27, 11:09 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Mar 27, 11:25 PM CDT | Tornado Warning | MEG | 14 min |
| Mar 27, 11:54 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Mar 27, 11:58 PM CDT | Tornado Warning | MEG | 17 min |
| Mar 30, 1:39 PM CDT | Flash Flood Watch | MEG | 19 hr |
| Mar 30, 10:26 PM CDT | Special Weather Statement | MEG | 49 min |
| Mar 30, 10:31 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Mar 30, 11:29 PM CDT | Areal Flood Advisory | MEG | 35 min |
| Mar 31, 12:04 AM CDT | Flash Flood Warning | MEG | 8 hr |
| Mar 31, 5:31 AM CDT | Freeze Watch | MEG | 9 hr |
| Mar 31, 5:31 AM CDT | Freeze Watch | MEG | 9 hr |
| Mar 31, 5:31 AM CDT | Freeze Warning | MEG | 27 hr |
| Mar 31, 8:05 AM CDT | Areal Flood Warning | MEG | 10 min |
| Mar 31, 8:28 AM CDT | Areal Flood Warning | MEG | 3 hr |
| Mar 31, 2:34 PM CDT | Freeze Warning | MEG | 42 hr |
| Apr 1, 2:06 PM CDT | Freeze Warning | MEG | 43 hr |
| Apr 7, 5:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 9, 3:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 9, 6:56 PM CDT | Severe Thunderstorm Warning | MEG | 49 min |
| Apr 9, 7:05 PM CDT | Severe Thunderstorm Warning | MEG | 40 min |
| Apr 9, 7:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 9, 7:41 PM CDT | Severe Thunderstorm Warning | MEG | 17 min |
| Apr 9, 8:01 PM CDT | Severe Thunderstorm Warning | MEG | 44 min |
| Apr 9, 8:21 PM CDT | Areal Flood Advisory | MEG | 88 min |
| Apr 9, 8:38 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Apr 9, 8:45 PM CDT | Severe Thunderstorm Warning | MEG | 17 min |
| Apr 9, 9:59 PM CDT | Special Weather Statement | MEG | 31 min |
| Apr 19, 7:12 AM CDT | Dense Fog Advisory | MEG | 108 min |
| Apr 21, 3:02 AM CDT | Frost Advisory | MEG | 30 hr |
| Apr 21, 3:19 PM CDT | Freeze Warning | MEG | 18 hr |
| Apr 25, 3:00 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| May 3, 1:56 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 3, 4:58 AM CDT | Special Weather Statement | MEG | 32 min |
| May 3, 5:02 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| May 4, 1:06 AM CDT | Mesoscale Discussion | SPC | 114 min |
| May 4, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 4, 4:17 AM CDT | Mesoscale Discussion | SPC | 88 min |
| May 4, 11:58 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 4:09 PM CDT | Special Weather Statement | MEG | 36 min |
| May 6, 4:39 PM CDT | Special Weather Statement | MEG | 36 min |
| May 8, 3:13 PM CDT | Wind Advisory | MEG | 26 hr |
| May 9, 12:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 9, 2:27 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 9, 5:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 9, 5:54 PM CDT | Severe Thunderstorm Warning | MEG | 36 min |
| May 26, 9:11 PM CDT | Dense Fog Advisory | MEG | 12 hr |
| May 27, 11:21 PM CDT | Severe Thunderstorm Warning | MEG | 54 min |
| May 28, 12:16 AM CDT | Special Weather Statement | MEG | 44 min |
| Jun 2, 2:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 24, 4:51 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| Jul 24, 2:24 PM CDT | Heat Advisory | MEG | 29 hr |
| Jul 26, 2:36 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 26, 3:59 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jul 28, 2:38 PM CDT | Heat Advisory | MEG | 29 hr |
| Jul 29, 2:51 PM CDT | Heat Advisory | MEG | 29 hr |
| Jul 30, 2:41 AM CDT | Heat Advisory | MEG | 41 hr |
| Jul 31, 11:07 PM CDT | Severe Thunderstorm Warning | MEG | 23 min |
| Aug 1, 8:33 AM CDT | Special Weather Statement | MEG | 57 min |
| Aug 8, 2:21 PM CDT | Heat Advisory | MEG | 4 days |
| Aug 13, 10:13 PM CDT | Dense Fog Advisory | MEG | 10 hr |
| Aug 18, 1:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 3:41 PM CDT | Special Weather Statement | MEG | 34 min |
| Aug 28, 2:42 PM CDT | Flash Flood Watch | MEG | 66 hr |
| Aug 29, 2:32 PM CDT | Wind Advisory | MEG | 36 hr |
| Sep 14, 5:56 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Sep 18, 6:24 AM CDT | Flash Flood Watch | MEG | 56 hr |
| Oct 4, 1:08 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Oct 6, 10:39 PM CDT | Dense Fog Advisory | MEG | 10 hr |
| Oct 15, 5:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Oct 15, 6:05 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Oct 15, 8:03 PM CDT | Special Weather Statement | MEG | 27 min |
| Oct 17, 3:00 PM CDT | Frost Advisory | MEG | 18 hr |
| Nov 3, 3:26 AM CDT | Freeze Watch | MEG | 24 hr |
| Nov 3, 3:26 AM CDT | Freeze Warning | MEG | 30 hr |
| Nov 4, 3:14 AM CDT | Freeze Warning | MEG | 30 hr |
| Nov 10, 6:12 AM CST | Dense Fog Advisory | MEG | 2 hr |
| Nov 21, 3:40 PM CST | Special Weather Statement | MEG | 35 min |
| Dec 4, 10:00 PM CST | Dense Fog Advisory | MEG | 11 hr |
| Dec 5, 5:05 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 6, 5:06 AM CST | Mesoscale Discussion | SPC | 114 min |
| Dec 10, 5:17 PM CST | Mesoscale Discussion | SPC | 88 min |
| Dec 10, 6:21 PM CST | Tornado Watch | SPC | 10 hr |
| Dec 10, 9:40 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 10, 10:09 PM CST | Mesoscale Discussion | SPC | 96 min |
| Dec 10, 10:44 PM CST | Tornado Watch | SPC | 6 hr |
| Dec 11, 2:00 AM CST | Mesoscale Discussion | SPC | 90 min |
| Dec 11, 2:26 AM CST | Special Weather Statement | MEG | 34 min |
| Dec 11, 3:03 AM CST | Severe Thunderstorm Warning | MEG | 42 min |
| Dec 11, 3:19 AM CST | Areal Flood Advisory | MEG | 3 hr |
| Dec 11, 3:30 AM CST | Tornado Warning | MEG | 21 min |
| Dec 17, 9:11 AM CST | Dense Fog Advisory | MEG | 3 hr |
| Dec 25, 9:40 PM CST | Dense Fog Advisory | MEG | 14 hr |
| Dec 29, 10:44 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 29, 12:05 PM CST | Tornado Watch | SPC | 7 hr |
| Dec 29, 3:41 PM CST | Mesoscale Discussion | SPC | 64 min |
| Dec 29, 9:47 PM CST | Dense Fog Advisory | MEG | 14 hr |
| Dec 30, 7:57 PM CST | Dense Fog Advisory | MEG | 13 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 | 14 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 11 |
| Mesoscale Discussion | 36 |
| Special Weather Statement | 12 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 9 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 3 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 17 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.