Alert archive / Tennessee / Union County
Weather alerts in Union County, Tennessee, 2024
120 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 120
- Warnings
- 35
- Watches
- 14
- Advisories
- 36
- Busiest month
- May33 alerts
- Busiest day
- August 2, 202412 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 Union County in 2024 had a tornado report inside them.
Union County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 20 | 26% | 4 | 100% | 16 min |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 18 | 3 | 83% | 4 | 100% | 11 min |
| NWS Morristown, TN: severe thunderstorm warnings | 189 | 140 | 26% | 229 | 86% | 22 min |
| NWS Morristown, TN: flash flood warnings | 61 | 35 | 43% | 92 | 76% | 75 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 8, 3:45 AM EST | Wind Advisory | MRX | 57 hr |
| Jan 9, 9:27 AM EST | Areal Flood Advisory | MRX | 4 hr |
| Jan 11, 3:21 AM EST | Wind Advisory | MRX | 60 hr |
| Jan 13, 3:39 AM EST | Winter Storm Watch | MRX | 24 hr |
| Jan 14, 3:43 AM EST | Winter Storm Warning | MRX | 51 hr |
| Jan 15, 12:50 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 16, 3:22 AM EST | Wind Chill Advisory | MRX | 33 hr |
| Jan 17, 3:18 PM EST | Winter Weather Advisory | MRX | 64 hr |
| Jan 19, 3:39 AM EST | Wind Chill Advisory | MRX | 54 hr |
| Jan 23, 2:20 PM EST | Flood Watch | MRX | 53 hr |
| Jan 25, 6:02 AM EST | Dense Fog Advisory | MRX | 3 hr |
| Jan 25, 10:07 AM EST | Dense Fog Advisory | MRX | 113 min |
| Jan 26, 3:16 PM EST | Flood Watch | MRX | 23 hr |
| Feb 22, 11:32 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 26, 3:00 PM EST | Wind Advisory | MRX | 52 hr |
| Feb 27, 6:42 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 28, 11:01 AM EST | Special Weather Statement | MRX | 44 min |
| Mar 3, 1:48 AM EST | Dense Fog Advisory | MRX | 7 hr |
| Mar 28, 2:56 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 2, 3:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Apr 2, 5:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 2, 6:07 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 2, 11:16 PM EDT | Special Weather Statement | MRX | 29 min |
| Apr 3, 12:00 AM EDT | Special Weather Statement | MRX | 30 min |
| Apr 6, 12:51 PM EDT | Frost Advisory | MRX | 20 hr |
| Apr 11, 1:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 11, 4:43 PM EDT | Severe Thunderstorm Warning | MRX | 47 min |
| May 1, 3:16 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| May 8, 2:28 AM EDT | Flood Watch | MRX | 30 hr |
| May 8, 8:50 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 8, 9:44 AM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| May 8, 10:04 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 8, 10:43 AM EDT | Severe Thunderstorm Warning | MRX | 25 min |
| May 8, 11:18 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| May 9, 5:43 AM EDT | Areal Flood Advisory | MRX | 4 hr |
| May 11, 5:58 AM EDT | Dense Fog Advisory | MRX | 3 hr |
| May 22, 6:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 22, 7:44 PM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| May 22, 8:42 PM EDT | Special Weather Statement | MRX | 48 min |
| May 23, 1:44 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 23, 7:23 PM EDT | Severe Thunderstorm Warning | MRX | 67 min |
| May 23, 7:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 23, 8:14 PM EDT | Special Weather Statement | MRX | 61 min |
| May 25, 8:21 AM EDT | Areal Flood Advisory | MRX | 2 hr |
| May 26, 9:59 AM EDT | Tornado Watch | SPC | 8 hr |
| May 26, 12:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 26, 1:18 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| May 26, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 26, 4:18 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| May 26, 4:24 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| May 26, 4:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 26, 5:00 PM EDT | Tornado Warning | MRX | 12 min |
| May 26, 5:36 PM EDT | Severe Thunderstorm Warning | MRX | 21 min |
| May 26, 10:43 PM EDT | Tornado Watch | SPC | 7 hr |
| May 27, 2:11 AM EDT | Special Weather Statement | MRX | 49 min |
| May 27, 2:21 AM EDT | Severe Thunderstorm Warning | MRX | 54 min |
| May 27, 2:50 AM EDT | Special Weather Statement | MRX | 40 min |
| May 27, 2:57 AM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| May 27, 3:05 AM EDT | Mesoscale Discussion | SPC | 55 min |
| May 27, 3:07 AM EDT | Severe Thunderstorm Warning | MRX | 37 min |
| Jun 4, 10:53 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 5, 1:36 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 10, 4:45 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Jun 23, 7:45 PM EDT | Special Weather Statement | MRX | 45 min |
| Jun 23, 7:54 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Jun 30, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 8:56 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 3:52 PM EDT | Special Weather Statement | MRX | 38 min |
| Jul 17, 3:35 PM EDT | Special Weather Statement | MRX | 40 min |
| Jul 22, 5:44 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Jul 28, 8:34 PM EDT | Areal Flood Advisory | MRX | 116 min |
| Jul 30, 3:36 AM EDT | Flood Watch | MRX | 4 days |
| Jul 30, 7:19 AM EDT | Severe Thunderstorm Warning | MRX | 56 min |
| Jul 30, 12:59 PM EDT | Special Weather Statement | MRX | 61 min |
| Jul 30, 2:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 30, 2:23 PM EDT | Special Weather Statement | MRX | 52 min |
| Jul 30, 3:53 PM EDT | Severe Thunderstorm Warning | MRX | 55 min |
| Jul 30, 4:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 30, 4:41 PM EDT | Severe Thunderstorm Warning | MRX | 34 min |
| Jul 30, 4:44 PM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Jul 30, 5:09 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Jul 30, 5:22 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 31, 7:45 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 31, 8:12 PM EDT | Severe Thunderstorm Warning | MRX | 21 min |
| Jul 31, 8:32 PM EDT | Special Weather Statement | MRX | 28 min |
| Aug 1, 8:53 PM EDT | Special Weather Statement | MRX | 52 min |
| Aug 1, 8:55 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Aug 1, 9:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 1, 9:08 PM EDT | Severe Thunderstorm Warning | MRX | 52 min |
| Aug 1, 9:48 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| Aug 2, 4:45 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 2, 5:08 PM EDT | Severe Thunderstorm Warning | MRX | 26 min |
| Aug 2, 5:28 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Aug 2, 7:01 PM EDT | Special Weather Statement | MRX | 44 min |
| Aug 2, 7:06 PM EDT | Flash Flood Warning | MRX | 2 hr |
| Aug 2, 7:30 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Aug 2, 7:39 PM EDT | Special Weather Statement | MRX | 51 min |
| Aug 4, 1:57 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Aug 17, 10:28 PM EDT | Severe Thunderstorm Warning | MRX | 9 min |
| Aug 17, 11:18 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Aug 17, 11:51 PM EDT | Special Weather Statement | MRX | 39 min |
| Sep 2, 12:32 AM EDT | Dense Fog Advisory | MRX | 8 hr |
| Sep 23, 2:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Sep 24, 2:55 PM EDT | Flood Watch | MRX | 71 hr |
| Sep 24, 4:33 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Sep 24, 6:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 25, 1:38 PM EDT | High Wind Watch | MRX | 23 hr |
| Sep 25, 9:40 PM EDT | High Wind Warning | MRX | 55 hr |
| Sep 26, 9:11 AM EDT | Areal Flood Warning | MRX | 8 hr |
| Sep 26, 4:59 PM EDT | Areal Flood Warning | MRX | 12 hr |
| Oct 2, 4:57 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Oct 2, 10:05 PM EDT | Dense Fog Advisory | MRX | 12 hr |
| Oct 5, 3:42 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Dec 9, 7:11 PM EST | Dense Fog Advisory | MRX | 9 hr |
| Dec 18, 3:18 AM EST | Dense Fog Advisory | MRX | 6 hr |
| Dec 29, 2:24 AM EST | Wind Advisory | MRX | 17 hr |
| Dec 29, 6:18 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Dec 29, 6:58 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Dec 29, 11:13 PM EST | Special Weather Statement | MRX | 47 min |
| Dec 30, 2:37 PM EST | Wind Advisory | MRX | 28 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 | 27 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 3 |
| Flood Watch | 5 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Cold | |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.