Alert archive / Tennessee / Henderson County
Weather alerts in Henderson County, Tennessee, 2018
133 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Henderson County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 133
- Warnings
- 28
- Watches
- 22
- Advisories
- 44
- Busiest month
- June29 alerts
- Busiest day
- June 21, 20187 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 Henderson County in 2018 had a tornado report inside them.
Henderson County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 13 | 7 | 46% | 3 | 33% | 30 min |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 52 | 7 | 87% | 15 | 60% | 18 min |
| NWS Memphis, TN: severe thunderstorm warnings | 344 | 142 | 59% | 379 | 67% | 24 min |
| NWS Memphis, TN: flash flood warnings | 64 | 12 | 81% | 24 | 75% | 110 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, 3:22 PM CST | Wind Chill Advisory | MEG | 19 hr |
| Jan 8, 7:21 PM CST | Dense Fog Advisory | MEG | 14 hr |
| Jan 9, 4:53 PM CST | Dense Fog Advisory | MEG | 16 hr |
| Jan 10, 9:21 AM CST | Dense Fog Advisory | MEG | 9 hr |
| Jan 10, 2:39 PM CST | Winter Storm Watch | MEG | 24 hr |
| Jan 11, 2:17 PM CST | Winter Storm Warning | MEG | 28 hr |
| Jan 12, 2:00 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 15, 4:38 AM CST | Winter Storm Warning | MEG | 30 hr |
| Jan 15, 4:38 AM CST | Winter Weather Advisory | MEG | 34 hr |
| Jan 16, 11:36 AM CST | Wind Chill Advisory | MEG | 24 hr |
| Jan 17, 3:30 PM CST | Wind Chill Advisory | MEG | 18 hr |
| Feb 17, 10:30 PM CST | Dense Fog Advisory | MEG | 10 hr |
| Feb 18, 1:08 AM CST | Freezing Fog Advisory | MEG | 8 hr |
| Feb 19, 3:25 PM CST | Flood Watch | MEG | 5 days |
| Feb 22, 10:16 PM CST | Dense Fog Advisory | MEG | 3 hr |
| Feb 24, 3:16 PM CST | Tornado Watch | SPC | 8 hr |
| Feb 24, 6:40 PM CST | Mesoscale Discussion | SPC | 95 min |
| Feb 24, 7:27 PM CST | Severe Thunderstorm Warning | MEG | 48 min |
| Feb 24, 7:39 PM CST | Tornado Warning | MEG | 51 min |
| Feb 24, 8:03 PM CST | Flash Flood Warning | MEG | 3 hr |
| Feb 24, 9:34 PM CST | Mesoscale Discussion | SPC | 86 min |
| Feb 26, 5:33 AM CST | Dense Fog Advisory | MEG | 2 hr |
| Feb 26, 3:04 PM CST | Flood Watch | MEG | 69 hr |
| Feb 28, 8:48 AM CST | Areal Flood Warning | MEG | 6 hr |
| Mar 1, 2:01 AM CST | Flash Flood Warning | MEG | 9 hr |
| Mar 11, 9:16 AM CDT | Wind Advisory | MEG | 16 hr |
| Mar 12, 2:56 PM CDT | Freeze Watch | MEG | 24 hr |
| Mar 13, 2:33 PM CDT | Freeze Warning | MEG | 19 hr |
| Mar 20, 3:30 AM CDT | Freeze Warning | MEG | 28 hr |
| Mar 21, 3:37 AM CDT | Freeze Warning | MEG | 29 hr |
| Mar 24, 8:00 PM CDT | Severe Thunderstorm Warning | MEG | 45 min |
| Mar 24, 8:45 PM CDT | Severe Thunderstorm Warning | MEG | 21 min |
| Mar 27, 3:23 PM CDT | Flood Watch | MEG | 46 hr |
| Apr 2, 3:35 PM CDT | Wind Advisory | MEG | 30 hr |
| Apr 3, 6:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 3, 7:14 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 3, 8:37 PM CDT | Severe Thunderstorm Warning | MEG | 23 min |
| Apr 4, 3:44 AM CDT | Freeze Warning | MEG | 29 hr |
| Apr 7, 3:44 AM CDT | Freeze Warning | MEG | 29 hr |
| Apr 10, 3:01 PM CDT | Frost Advisory | MEG | 17 hr |
| Apr 12, 2:34 PM CDT | Flash Flood Watch | MEG | 48 hr |
| Apr 14, 5:30 AM CDT | Severe Thunderstorm Warning | MEG | 60 min |
| Apr 16, 4:39 AM CDT | Frost Advisory | MEG | 27 hr |
| Apr 19, 3:05 AM CDT | Frost Advisory | MEG | 30 hr |
| Apr 22, 7:32 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Apr 22, 10:04 PM CDT | Areal Flood Warning | MEG | 3 hr |
| Apr 25, 3:52 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Apr 27, 12:33 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| May 5, 10:05 PM CDT | Dense Fog Advisory | MEG | 11 hr |
| May 6, 3:00 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 16, 1:42 AM CDT | Areal Flood Advisory | MEG | 2 hr |
| May 16, 10:05 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| May 19, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 19, 6:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| May 20, 11:43 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 20, 12:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 20, 3:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 20, 6:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 23, 5:25 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| May 25, 1:53 PM CDT | Special Weather Statement | MEG | 37 min |
| May 29, 3:39 AM CDT | Flash Flood Watch | MEG | 27 hr |
| May 29, 7:24 PM CDT | Areal Flood Advisory | MEG | 4 hr |
| May 29, 11:51 PM CDT | Areal Flood Advisory | MEG | 114 min |
| May 31, 5:46 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 31, 7:56 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 1:38 AM CDT | Severe Thunderstorm Warning | MEG | 52 min |
| Jun 1, 2:54 AM CDT | Special Weather Statement | MEG | 66 min |
| Jun 2, 1:27 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Jun 3, 3:19 AM CDT | Severe Thunderstorm Warning | MEG | 24 min |
| Jun 3, 3:54 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 21, 12:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 1:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 5:27 PM CDT | Severe Thunderstorm Warning | MEG | 48 min |
| Jun 21, 5:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 6:03 PM CDT | Severe Thunderstorm Warning | MEG | 42 min |
| Jun 21, 6:28 PM CDT | Severe Thunderstorm Warning | MEG | 32 min |
| Jun 21, 8:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 4:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 24, 6:30 AM CDT | Special Weather Statement | MEG | 30 min |
| Jun 26, 5:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 7:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 10:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 27, 1:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 28, 3:12 AM CDT | Heat Advisory | MEG | 4 days |
| Jun 28, 10:22 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 10:46 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 11:58 AM CDT | Severe Thunderstorm Warning | MEG | 28 min |
| Jun 28, 8:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 28, 8:55 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 28, 9:55 PM CDT | Severe Thunderstorm Warning | MEG | 65 min |
| Jun 28, 10:27 PM CDT | Severe Thunderstorm Warning | MEG | 48 min |
| Jun 28, 11:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 4, 3:32 AM CDT | Heat Advisory | MEG | 40 hr |
| Jul 4, 9:23 PM CDT | Special Weather Statement | MEG | 52 min |
| Jul 4, 11:00 PM CDT | Special Weather Statement | MEG | 45 min |
| Jul 14, 3:06 AM CDT | Heat Advisory | MEG | 18 hr |
| Jul 15, 3:57 AM CDT | Heat Advisory | MEG | 16 hr |
| Jul 19, 3:42 PM CDT | Heat Advisory | MEG | 28 hr |
| Jul 20, 5:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 20, 6:22 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 20, 10:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 21, 1:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Aug 11, 11:41 PM CDT | Special Weather Statement | MEG | 49 min |
| Aug 12, 12:26 AM CDT | Special Weather Statement | MEG | 49 min |
| Aug 19, 4:18 AM CDT | Dense Fog Advisory | MEG | 5 hr |
| Aug 20, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 28, 2:05 AM CDT | Dense Fog Advisory | MEG | 7 hr |
| Sep 28, 9:06 AM CDT | Dense Fog Advisory | MEG | 54 min |
| Sep 29, 2:08 AM CDT | Dense Fog Advisory | MEG | 8 hr |
| Oct 21, 3:22 AM CDT | Frost Advisory | MEG | 30 hr |
| Oct 21, 2:46 PM CDT | Freeze Warning | MEG | 18 hr |
| Oct 30, 3:02 PM CDT | Flood Watch | MEG | 39 hr |
| Oct 31, 7:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Nov 1, 1:41 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Nov 2, 11:41 PM CDT | Dense Fog Advisory | MEG | 9 hr |
| Nov 5, 7:04 PM CST | Tornado Watch | SPC | 8 hr |
| Nov 5, 9:28 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 6, 1:22 AM CST | Dense Fog Advisory | MEG | 7 hr |
| Nov 8, 3:00 AM CST | Freeze Watch | MEG | 12 hr |
| Nov 8, 3:02 PM CST | Freeze Warning | MEG | 42 hr |
| Nov 13, 1:50 PM CST | Winter Weather Advisory | MEG | 43 hr |
| Nov 21, 4:08 AM CST | Freezing Fog Advisory | MEG | 5 hr |
| Nov 25, 3:47 AM CST | Wind Advisory | MEG | 25 hr |
| Dec 1, 9:14 AM CST | Special Weather Statement | MEG | 46 min |
| Dec 1, 2:24 PM CST | Special Weather Statement | MEG | 51 min |
| Dec 7, 6:22 PM CST | Winter Weather Advisory | MEG | 39 hr |
| Dec 11, 1:43 AM CST | Freezing Fog Advisory | MEG | 10 hr |
| Dec 16, 2:21 PM CST | Dense Fog Advisory | MEG | 22 hr |
| Dec 26, 10:40 AM CST | Wind Advisory | MEG | 28 hr |
| Dec 31, 11:22 AM CST | Mesoscale Discussion | SPC | 83 min |
| Dec 31, 11:47 AM CST | Tornado Watch | SPC | 5 hr |
| Dec 31, 12:01 PM CST | Special Weather Statement | MEG | 44 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 | 13 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 29 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 2 |
| Flood Watch | 4 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 7 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 18 |
| Freezing Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.