Alert archive / Tennessee / Union County
Weather alerts in Union County, Tennessee, 2023
151 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Union County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 151
- Warnings
- 66
- Watches
- 17
- Advisories
- 29
- Busiest month
- August30 alerts
- Busiest day
- July 29, 202311 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Union County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 49 | 44 | 10% | 6 | 100% | 28 min |
| Flash flood warnings | 4 | 3 | 25% | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 29 | 4 | 86% | 10 | 60% | 11 min |
| NWS Morristown, TN: severe thunderstorm warnings | 282 | 246 | 13% | 385 | 89% | 22 min |
| NWS Morristown, TN: flash flood warnings | 45 | 25 | 44% | 48 | 79% | 51 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 1:19 AM EST | Dense Fog Advisory | MRX | 8 hr |
| Jan 3, 2:07 PM EST | Special Weather Statement | MRX | 38 min |
| Jan 3, 2:41 PM EST | Severe Thunderstorm Warning | MRX | 34 min |
| Jan 3, 2:49 PM EST | Special Weather Statement | MRX | 26 min |
| Jan 3, 3:06 PM EST | Severe Thunderstorm Warning | MRX | 39 min |
| Jan 12, 12:47 PM EST | Severe Thunderstorm Warning | MRX | 30 min |
| Jan 17, 6:48 PM EST | Dense Fog Advisory | MRX | 16 hr |
| Jan 18, 4:10 AM EST | Wind Advisory | MRX | 39 hr |
| Jan 23, 3:38 PM EST | Wind Advisory | MRX | 51 hr |
| Jan 30, 10:24 PM EST | Dense Fog Advisory | MRX | 12 hr |
| Feb 8, 3:32 AM EST | Wind Advisory | MRX | 39 hr |
| Feb 16, 5:12 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 16, 5:26 AM EST | Flash Flood Warning | MRX | 3 hr |
| Feb 16, 8:31 PM EST | Special Weather Statement | MRX | 44 min |
| Feb 16, 9:08 PM EST | Special Weather Statement | MRX | 52 min |
| Feb 16, 9:12 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 16, 10:47 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 16, 11:36 PM EST | Flash Flood Warning | MRX | 3 hr |
| Feb 17, 1:29 AM EST | Areal Flood Advisory | MRX | 6 hr |
| Feb 17, 1:35 AM EST | Areal Flood Advisory | MRX | 6 hr |
| Feb 17, 2:20 AM EST | Areal Flood Warning | MRX | 3 hr |
| Feb 17, 8:23 AM EST | River Flood Warning | MRX | 48 hr |
| Feb 26, 3:26 AM EST | Wind Advisory | MRX | 52 hr |
| Mar 1, 9:59 PM EST | Special Weather Statement | MRX | 46 min |
| Mar 1, 10:35 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 1, 11:42 PM EST | Areal Flood Advisory | MRX | 80 min |
| Mar 2, 1:02 AM EST | Flash Flood Warning | MRX | 3 hr |
| Mar 2, 3:35 AM EST | High Wind Watch | MRX | 12 hr |
| Mar 2, 3:34 PM EST | High Wind Warning | MRX | 35 hr |
| Mar 3, 11:34 AM EST | Tornado Watch | SPC | 5 hr |
| Mar 3, 2:58 PM EST | Severe Thunderstorm Warning | MRX | 47 min |
| Mar 3, 3:33 PM EST | Severe Thunderstorm Warning | MRX | 42 min |
| Mar 12, 3:20 PM EDT | Freeze Watch | MRX | 12 hr |
| Mar 13, 3:09 AM EDT | Freeze Warning | MRX | 34 hr |
| Mar 14, 3:29 AM EDT | Freeze Warning | MRX | 32 hr |
| Mar 15, 3:44 AM EDT | Freeze Warning | MRX | 30 hr |
| Mar 17, 3:26 AM EDT | Freeze Watch | MRX | 7 hr |
| Mar 17, 10:10 AM EDT | Freeze Warning | MRX | 23 hr |
| Mar 18, 2:59 AM EDT | Freeze Warning | MRX | 34 hr |
| Mar 18, 3:33 PM EDT | Freeze Warning | MRX | 43 hr |
| Mar 19, 3:30 PM EDT | Freeze Watch | MRX | 12 hr |
| Mar 20, 3:09 AM EDT | Freeze Warning | MRX | 30 hr |
| Mar 24, 3:54 AM EDT | Wind Advisory | MRX | 40 hr |
| Mar 25, 1:03 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 25, 3:28 AM EDT | Special Weather Statement | MRX | 47 min |
| Mar 25, 3:41 AM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Mar 25, 5:49 AM EDT | Wind Advisory | MRX | 14 hr |
| Mar 28, 2:49 PM EDT | Frost Advisory | MRX | 18 hr |
| Mar 29, 3:09 PM EDT | Frost Advisory | MRX | 18 hr |
| Mar 31, 3:05 AM EDT | Wind Advisory | MRX | 41 hr |
| Apr 1, 2:49 AM EDT | Tornado Watch | SPC | 4 hr |
| Apr 1, 4:09 AM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Apr 1, 4:46 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 5, 6:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 3:39 PM EDT | Fire Weather Watch | MRX | 13 hr |
| Apr 20, 4:37 AM EDT | Red Flag Warning | MRX | 15 hr |
| Apr 23, 3:00 AM EDT | Frost Advisory | MRX | 30 hr |
| Apr 24, 11:59 AM EDT | Frost Advisory | MRX | 21 hr |
| Apr 30, 7:50 PM EDT | Special Weather Statement | MRX | 40 min |
| May 9, 5:23 AM EDT | Special Weather Statement | MRX | 37 min |
| May 9, 5:47 AM EDT | Severe Thunderstorm Warning | MRX | 33 min |
| May 16, 12:30 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 16, 3:26 PM EDT | Special Weather Statement | MRX | 34 min |
| May 16, 3:48 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| May 16, 3:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 16, 4:05 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| May 16, 5:32 PM EDT | Severe Thunderstorm Warning | MRX | 28 min |
| May 16, 5:56 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Jun 5, 2:21 PM EDT | Special Weather Statement | MRX | 39 min |
| Jun 5, 2:33 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Jun 5, 2:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 8, 3:08 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Jun 11, 4:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 11, 7:56 PM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Jun 11, 8:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jun 11, 8:56 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Jun 11, 9:17 PM EDT | Severe Thunderstorm Warning | MRX | 58 min |
| Jun 11, 10:07 PM EDT | Severe Thunderstorm Warning | MRX | 38 min |
| Jun 20, 4:15 PM EDT | Special Weather Statement | MRX | 45 min |
| Jun 25, 11:30 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 1:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 25, 10:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 12:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 26, 1:09 AM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Jun 26, 1:22 AM EDT | Severe Thunderstorm Warning | MRX | 38 min |
| Jun 26, 1:45 AM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jun 26, 1:54 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 26, 1:56 AM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Jun 26, 2:19 AM EDT | Severe Thunderstorm Warning | MRX | 41 min |
| Jun 30, 6:23 AM EDT | Special Weather Statement | MRX | 52 min |
| Jun 30, 7:07 AM EDT | Special Weather Statement | MRX | 53 min |
| Jul 1, 6:01 PM EDT | Special Weather Statement | MRX | 44 min |
| Jul 2, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 2, 5:45 PM EDT | Severe Thunderstorm Warning | MRX | 28 min |
| Jul 25, 4:03 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 25, 4:29 PM EDT | Severe Thunderstorm Warning | MRX | 22 min |
| Jul 25, 4:31 PM EDT | Severe Thunderstorm Warning | MRX | 27 min |
| Jul 25, 4:40 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 29, 2:46 PM EDT | Special Weather Statement | MRX | 44 min |
| Jul 29, 2:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 29, 3:05 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Jul 29, 3:41 PM EDT | Severe Thunderstorm Warning | MRX | 29 min |
| Jul 29, 3:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 29, 5:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 29, 5:49 PM EDT | Special Weather Statement | MRX | 41 min |
| Jul 29, 6:01 PM EDT | Severe Thunderstorm Warning | MRX | 59 min |
| Jul 29, 6:13 PM EDT | Severe Thunderstorm Warning | MRX | 20 min |
| Jul 29, 6:38 PM EDT | Severe Thunderstorm Warning | MRX | 38 min |
| Jul 29, 7:06 PM EDT | Severe Thunderstorm Warning | MRX | 54 min |
| Aug 7, 8:18 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 7, 11:17 AM EDT | Tornado Watch | SPC | 7 hr |
| Aug 7, 12:11 PM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Aug 7, 12:42 PM EDT | Severe Thunderstorm Warning | MRX | 63 min |
| Aug 7, 1:11 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Aug 7, 1:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Aug 7, 1:41 PM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Aug 7, 2:02 PM EDT | Severe Thunderstorm Warning | MRX | 58 min |
| Aug 7, 2:35 PM EDT | Severe Thunderstorm Warning | MRX | 32 min |
| Aug 7, 2:39 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Aug 12, 11:50 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Aug 12, 1:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 2:39 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Aug 12, 2:51 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Aug 12, 3:07 PM EDT | Areal Flood Advisory | MRX | 113 min |
| Aug 12, 3:08 PM EDT | Severe Thunderstorm Warning | MRX | 67 min |
| Aug 12, 3:29 PM EDT | Severe Thunderstorm Warning | MRX | 26 min |
| Aug 14, 7:41 PM EDT | Special Weather Statement | MRX | 34 min |
| Aug 14, 8:00 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Aug 14, 8:31 PM EDT | Severe Thunderstorm Warning | MRX | 44 min |
| Aug 14, 8:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 14, 9:21 PM EDT | Areal Flood Advisory | MRX | 11 min |
| Aug 14, 9:32 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Aug 15, 12:01 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 24, 1:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 24, 1:16 PM EDT | Special Weather Statement | MRX | 44 min |
| Aug 24, 1:25 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Aug 25, 8:57 PM EDT | Special Weather Statement | MRX | 33 min |
| Aug 28, 10:08 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 9, 7:11 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Sep 9, 7:27 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 9, 8:30 PM EDT | Areal Flood Advisory | MRX | 4 hr |
| Sep 12, 2:20 PM EDT | Special Weather Statement | MRX | 40 min |
| Sep 12, 2:51 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Sep 27, 3:04 PM EDT | Special Weather Statement | MRX | 41 min |
| Oct 30, 3:42 AM EDT | Freeze Watch | MRX | 24 hr |
| Oct 31, 3:37 AM EDT | Freeze Warning | MRX | 30 hr |
| Nov 1, 4:09 AM EDT | Freeze Warning | MRX | 29 hr |
| Dec 2, 3:22 AM EST | Dense Fog Advisory | MRX | 8 hr |
| Dec 9, 9:53 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 9, 11:46 PM EST | Severe Thunderstorm Warning | MRX | 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 | 49 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 22 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 4 |
| River Flood Warning | 1 |
| Areal Flood Advisory | 13 |
| Cold | |
| Freeze Warning | 9 |
| Freeze Watch | 4 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.