Alert archive / Tennessee / Henry County
Weather alerts in Henry County, Tennessee, 2020
119 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Henry County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 119
- Warnings
- 25
- Watches
- 21
- Advisories
- 42
- Busiest month
- April22 alerts
- Busiest day
- September 1, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Henry County in 2020 had a tornado report inside them.
Henry County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 11 | 9 | 18% | 10 | 80% | 26 min |
| Flash flood warnings | 1 | 1 | 0% | 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 |
|---|---|---|---|
| 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, 5:59 AM CST | Special Weather Statement | MEG | 46 min |
| Jan 11, 6:38 AM CST | Severe Thunderstorm Warning | MEG | 37 min |
| Feb 6, 7:27 PM CST | Winter Weather Advisory | MEG | 13 hr |
| Feb 9, 3:05 AM CST | Flood Watch | MEG | 4 days |
| Feb 9, 1:55 PM CST | River Flood Warning | MEG | 48 hr |
| Feb 11, 1:39 PM CST | River Flood Advisory | MEG | 27 hr |
| Feb 12, 5:00 PM CST | River Flood Warning | MEG | 11 days |
| Mar 2, 5:21 PM CST | Tornado Watch | SPC | 8 hr |
| Mar 2, 9:53 PM CST | Special Weather Statement | MEG | 52 min |
| Mar 2, 10:01 PM CST | Severe Thunderstorm Warning | MEG | 44 min |
| Mar 2, 10:45 PM CST | Severe Thunderstorm Warning | MEG | 45 min |
| Mar 2, 11:02 PM CST | Tornado Warning | MEG | 25 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 12, 11:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 12, 11:44 AM CDT | Tornado Watch | SPC | 6 hr |
| Mar 12, 12:21 PM CDT | Special Weather Statement | MEG | 24 min |
| Mar 12, 12:47 PM CDT | Special Weather Statement | MEG | 28 min |
| Mar 19, 9:50 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 20, 2:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Mar 20, 3:09 AM CDT | Special Weather Statement | MEG | 36 min |
| Mar 24, 11:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 24, 2:08 PM CDT | River Flood Warning | MEG | 12 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, 9:37 PM CDT | Severe Thunderstorm Warning | MEG | 53 min |
| Apr 8, 7:04 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 8, 7:58 PM CDT | Severe Thunderstorm Warning | MEG | 47 min |
| Apr 8, 8:37 PM CDT | Severe Thunderstorm Warning | MEG | 38 min |
| Apr 8, 9:04 PM CDT | Severe Thunderstorm Warning | MEG | 41 min |
| 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, 11:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 13, 12:05 AM CDT | Special Weather Statement | MEG | 40 min |
| Apr 13, 1:43 AM CDT | High Wind Warning | MEG | 4 hr |
| Apr 13, 4:22 AM CDT | River Flood Warning | MEG | 4 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 17, 11:30 AM CDT | River Flood Advisory | MEG | 4 days |
| 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, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 29, 12:52 AM CDT | Special Weather Statement | MEG | 38 min |
| May 3, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 3, 12:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 3, 2:38 PM CDT | Severe Thunderstorm Warning | MEG | 52 min |
| May 3, 3:27 PM CDT | Severe Thunderstorm Warning | MEG | 18 min |
| May 3, 6:18 PM CDT | Mesoscale Discussion | SPC | 57 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, 6:49 PM CDT | Areal Flood Advisory | MEG | 116 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 26, 9:24 PM CDT | River Flood Advisory | MEG | 18 hr |
| May 27, 3:14 PM CDT | River Flood Warning | MEG | 46 hr |
| May 28, 1:16 PM CDT | River Flood Warning | MEG | 25 hr |
| May 28, 4:10 PM CDT | Special Weather Statement | MEG | 35 min |
| May 29, 2:16 PM CDT | River Flood Advisory | MEG | 3 days |
| Jun 1, 8:13 PM CDT | River Flood Warning | MEG | 12 hr |
| Jun 5, 6:34 AM CDT | Dense Fog Advisory | MEG | 54 min |
| Jun 5, 11:03 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 1:47 PM CDT | Areal Flood Advisory | MEG | 118 min |
| Jun 30, 1:58 PM CDT | Special Weather Statement | MEG | 17 min |
| Jun 30, 2:56 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jun 30, 8:34 PM CDT | Special Weather Statement | MEG | 26 min |
| Jun 30, 9:25 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 1, 11:26 AM CDT | Flash Flood Watch | MEG | 17 hr |
| Jul 1, 4:24 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 2, 4:11 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Jul 2, 12:04 PM CDT | River Flood Advisory | MEG | 56 hr |
| Jul 12, 6:17 AM CDT | Special Weather Statement | MEG | 28 min |
| Jul 12, 6:54 AM CDT | Special Weather Statement | MEG | 36 min |
| Jul 12, 7:29 AM CDT | Special Weather Statement | MEG | 46 min |
| Jul 12, 8:02 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 12, 8:22 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| Jul 12, 8:26 AM CDT | Flash Flood Warning | MEG | 3 hr |
| Jul 15, 2:23 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 16, 12:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 3:29 PM CDT | Heat Advisory | MEG | 28 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 27, 1:04 AM CDT | Flash Flood Watch | MEG | 51 hr |
| Aug 27, 2:33 AM CDT | Wind Advisory | MEG | 37 hr |
| Aug 27, 7:02 PM CDT | Severe Thunderstorm Warning | MEG | 43 min |
| Aug 29, 3:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 30, 3:15 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 31, 3:41 PM CDT | Special Weather Statement | MEG | 34 min |
| Sep 1, 4:59 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| Sep 1, 9:49 AM CDT | Flash Flood Watch | MEG | 41 hr |
| Sep 1, 12:58 PM CDT | Special Weather Statement | MEG | 47 min |
| Sep 1, 1:02 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Sep 1, 1:41 PM CDT | Special Weather Statement | MEG | 49 min |
| Sep 1, 2:20 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| Sep 1, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 2, 12:35 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 13, 2:59 AM CDT | Dense Fog Advisory | MEG | 6 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 23, 3:05 PM CDT | Severe Thunderstorm Warning | MEG | 25 min |
| Oct 28, 7:06 PM CDT | Areal Flood Advisory | MEG | 3 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 19, 4:17 AM CST | Red Flag Warning | MEG | 14 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 | 11 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 16 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 8 |
| Flash Flood Watch | 5 |
| Flood Watch | 1 |
| Areal Flood Advisory | 10 |
| River Flood Advisory | 5 |
| 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 |
| Fire | |
| Red Flag Warning | 1 |
| 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.