Alert archive / Tennessee / Union County
Weather alerts in Union County, Tennessee, 2026
92 weather alerts in 2026, 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 2026. Tap one for its archive.
- Alerts
- 92
- Warnings
- 19
- Watches
- 13
- Advisories
- 27
- Busiest month
- July26 alerts
- Busiest day
- July 22, 20267 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, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 12 | 11 | 8% | 3 | 100% | 28 min |
| Flash flood warnings | 5 | 4 | 20% | 4 | 100% | 121 min |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 10 | 1 | 90% | 3 | 33% | 3 min |
| NWS Morristown, TN: severe thunderstorm warnings | 182 | 146 | 20% | 226 | 89% | 22 min |
| NWS Morristown, TN: flash flood warnings | 81 | 55 | 32% | 128 | 84% | 70 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 21, 12:27 PM EST | Winter Storm Watch | MRX | 45 hr |
| Jan 23, 9:54 AM EST | Winter Storm Warning | MRX | 49 hr |
| Jan 24, 1:17 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 24, 6:45 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 24, 11:49 PM EST | Cold Weather Advisory | MRX | 34 hr |
| Jan 25, 12:01 PM EST | Cold Weather Advisory | MRX | 48 hr |
| Jan 25, 1:54 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Jan 29, 12:50 PM EST | Winter Storm Warning | MRX | 57 hr |
| Jan 29, 12:50 PM EST | Winter Weather Advisory | MRX | 54 hr |
| Jan 29, 1:00 PM EST | Cold Weather Advisory | MRX | 71 hr |
| Feb 4, 4:01 AM EST | Dense Fog Advisory | MRX | 8 hr |
| Feb 26, 3:36 AM EST | Areal Flood Advisory | MRX | 5 hr |
| Mar 9, 3:05 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Mar 11, 5:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 11, 7:09 PM EDT | Special Weather Statement | MRX | 51 min |
| Mar 15, 2:17 PM EDT | Wind Advisory | MRX | 18 hr |
| Mar 16, 12:41 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 16, 2:40 AM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Mar 16, 3:21 AM EDT | Severe Thunderstorm Warning | MRX | 54 min |
| Mar 21, 3:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 21, 4:46 PM EDT | Special Weather Statement | MRX | 29 min |
| Mar 21, 5:08 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Apr 4, 6:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 16, 6:47 PM EDT | Special Weather Statement | MRX | 43 min |
| Apr 26, 12:52 AM EDT | Dense Fog Advisory | MRX | 9 hr |
| May 2, 12:42 PM EDT | Frost Advisory | MRX | 20 hr |
| May 20, 7:24 PM EDT | Special Weather Statement | MRX | 51 min |
| May 22, 5:19 PM EDT | Special Weather Statement | MRX | 41 min |
| May 22, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| May 22, 6:31 PM EDT | Areal Flood Advisory | MRX | 119 min |
| May 22, 6:33 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| May 24, 12:57 PM EDT | Flood Watch | MRX | 13 hr |
| May 29, 1:59 PM EDT | Flood Watch | MRX | 24 hr |
| Jun 7, 2:09 PM EDT | Flood Watch | MRX | 31 hr |
| Jun 22, 3:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 27, 9:44 AM EDT | Flood Watch | MRX | 28 hr |
| Jun 27, 3:21 PM EDT | Special Weather Statement | MRX | 39 min |
| Jun 28, 9:08 AM EDT | Flash Flood Warning | MRX | 5 hr |
| Jun 28, 1:40 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Jun 29, 1:34 PM EDT | Heat Advisory | MRX | 5 days |
| Jul 3, 9:03 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Jul 3, 11:15 PM EDT | Special Weather Statement | MRX | 30 min |
| Jul 5, 12:56 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Jul 9, 11:44 AM EDT | Flood Watch | MRX | 4 days |
| Jul 12, 12:00 AM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 12, 8:55 PM EDT | Areal Flood Advisory | MRX | 85 min |
| Jul 17, 3:50 PM EDT | Flash Flood Warning | MRX | 97 min |
| Jul 18, 5:56 PM EDT | Special Weather Statement | MRX | 49 min |
| Jul 19, 3:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 1:45 PM EDT | Flood Watch | MRX | 54 hr |
| Jul 21, 5:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 21, 6:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 5:56 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 22, 9:09 AM EDT | Flash Flood Warning | MRX | 4 hr |
| Jul 22, 9:16 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 22, 10:10 AM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 22, 12:07 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 22, 12:46 PM EDT | Areal Flood Advisory | MRX | 119 min |
| Jul 22, 1:29 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 27, 1:35 AM EDT | Special Weather Statement | MRX | 40 min |
| Jul 27, 2:21 AM EDT | Special Weather Statement | MRX | 39 min |
| Jul 28, 12:14 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 28, 9:14 AM EDT | Special Weather Statement | MRX | 46 min |
| Jul 28, 12:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 28, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 28, 3:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 1:07 AM EDT | Areal Flood Advisory | MRX | 113 min |
| Aug 10, 4:11 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Aug 11, 5:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 7:06 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 11, 8:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 8:29 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| Aug 11, 9:22 PM EDT | Special Weather Statement | MRX | 53 min |
| Aug 12, 2:38 AM EDT | Flood Watch | MRX | 29 hr |
| Aug 12, 10:00 AM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 14, 12:57 AM EDT | Special Weather Statement | MRX | 48 min |
| Aug 14, 1:49 PM EDT | Severe Thunderstorm Warning | MRX | 41 min |
| Aug 15, 1:25 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 15, 1:38 PM EDT | Special Weather Statement | MRX | 52 min |
| Aug 17, 1:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 17, 2:35 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 17, 3:26 PM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Aug 17, 4:07 PM EDT | Severe Thunderstorm Warning | MRX | 53 min |
| Aug 17, 4:30 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 22, 7:37 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Sep 2, 12:32 AM EDT | Heat Advisory | MRX | 4 days |
| Sep 2, 1:58 PM EDT | Heat Advisory | MRX | 3 days |
| Sep 13, 3:38 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Sep 18, 6:31 PM EDT | Special Weather Statement | MRX | 29 min |
| Sep 20, 5:30 PM EDT | Special Weather Statement | MRX | 45 min |
| Sep 20, 5:37 PM EDT | Severe Thunderstorm Warning | MRX | 38 min |
| Sep 21, 3:32 PM EDT | Special Weather Statement | MRX | 43 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 | 12 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 17 |
| Flooding | |
| Flash Flood Warning | 5 |
| Flood Watch | 7 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Cold Weather Advisory | 3 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 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 archive2025
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.