Alert archive / Tennessee / Union County
Weather alerts in Union County, Tennessee, 2009
143 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 143
- Warnings
- 44
- Watches
- 27
- Advisories
- 36
- Busiest month
- June43 alerts
- Busiest day
- June 17, 200911 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 3 tornado warnings covering Union County in 2009 had a tornado report inside them.
Union County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 31 | 24 | 23% | 13 | 100% | 28 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 86 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 41 | 11 | 73% | 14 | 93% | 22 min |
| NWS Morristown, TN: severe thunderstorm warnings | 335 | 252 | 25% | 434 | 87% | 26 min |
| NWS Morristown, TN: flash flood warnings | 39 | 29 | 26% | 59 | 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 3, 12:43 AM EST | Dense Fog Advisory | MRX | 9 hr |
| Jan 4, 3:31 AM EST | Severe Thunderstorm Warning | MRX | 44 min |
| Jan 5, 3:51 AM EST | Flood Watch | MRX | 51 hr |
| Jan 6, 5:55 PM EST | Areal Flood Warning | MRX | 16 hr |
| Jan 7, 3:05 PM EST | Winter Weather Advisory | MRX | 21 hr |
| Jan 10, 6:17 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Jan 15, 3:18 AM EST | Wind Chill Advisory | MRX | 33 hr |
| Jan 17, 10:37 PM EST | Freezing Rain Advisory | MRX | 11 hr |
| Jan 18, 4:12 AM EST | Winter Weather Advisory | MRX | 63 hr |
| Feb 2, 10:38 AM EST | Winter Weather Advisory | MRX | 5 hr |
| Feb 3, 4:28 AM EST | Winter Weather Advisory | MRX | 47 hr |
| Feb 3, 2:57 PM EST | Wind Chill Advisory | MRX | 22 hr |
| Feb 10, 2:56 PM EST | Wind Advisory | MRX | 45 hr |
| Feb 11, 11:02 AM EST | Mesoscale Discussion | SPC | 88 min |
| Feb 11, 1:35 PM EST | Mesoscale Discussion | SPC | 85 min |
| Feb 11, 1:59 PM EST | Tornado Watch | SPC | 7 hr |
| Feb 11, 3:45 PM EST | Severe Thunderstorm Warning | MRX | 60 min |
| Feb 11, 4:34 PM EST | Mesoscale Discussion | SPC | 86 min |
| Feb 18, 12:09 PM EST | Tornado Watch | SPC | 6 hr |
| Feb 18, 2:33 PM EST | Mesoscale Discussion | SPC | 87 min |
| Mar 20, 2:43 PM EDT | Freeze Warning | MRX | 18 hr |
| Apr 2, 5:02 AM EDT | Wind Advisory | MRX | 35 hr |
| Apr 2, 6:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 2, 11:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 2, 11:35 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 3, 12:50 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 5, 8:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 5, 8:53 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 6, 12:08 AM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 6, 3:27 PM EDT | Freeze Watch | MRX | 12 hr |
| Apr 6, 3:27 PM EDT | Freeze Warning | MRX | 12 hr |
| Apr 7, 3:54 AM EDT | Freeze Warning | MRX | 30 hr |
| Apr 10, 2:51 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 10, 4:24 PM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Apr 10, 5:32 PM EDT | Severe Thunderstorm Warning | MRX | 28 min |
| Apr 10, 7:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 12, 8:40 PM EDT | Wind Advisory | MRX | 18 hr |
| Apr 21, 2:17 PM EDT | Wind Advisory | MRX | 6 hr |
| May 2, 2:54 PM EDT | Flood Watch | MRX | 44 hr |
| May 5, 3:29 PM EDT | Flood Watch | MRX | 31 hr |
| May 8, 8:07 AM EDT | Severe Thunderstorm Warning | MRX | 53 min |
| May 8, 1:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 8, 4:42 PM EDT | Tornado Watch | SPC | 7 hr |
| May 8, 5:51 PM EDT | Tornado Warning | MRX | 54 min |
| May 8, 6:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 8, 6:38 PM EDT | Tornado Warning | MRX | 52 min |
| May 8, 8:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 15, 1:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 15, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| May 16, 2:45 AM EDT | Flash Flood Watch | MRX | 19 hr |
| May 18, 9:22 PM EDT | Frost Advisory | MRX | 12 hr |
| May 28, 1:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 28, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 28, 4:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 28, 7:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 3, 4:02 PM EDT | Severe Thunderstorm Warning | MRX | 43 min |
| Jun 4, 6:10 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Jun 8, 2:43 PM EDT | Severe Thunderstorm Warning | MRX | 32 min |
| Jun 8, 3:20 PM EDT | Severe Thunderstorm Warning | MRX | 25 min |
| Jun 8, 3:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 10, 2:38 PM EDT | Severe Thunderstorm Warning | MRX | 34 min |
| Jun 10, 6:10 PM EDT | Areal Flood Advisory | MRX | 110 min |
| Jun 11, 12:18 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 11, 1:52 PM EDT | Severe Thunderstorm Warning | MRX | 53 min |
| Jun 11, 2:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 11, 8:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 11, 9:18 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 11, 11:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 16, 2:10 PM EDT | Mesoscale Discussion | SPC | 35 min |
| Jun 16, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 4:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 16, 5:59 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| Jun 16, 6:18 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| Jun 16, 6:31 PM EDT | Severe Thunderstorm Warning | MRX | 59 min |
| Jun 16, 7:35 PM EDT | Tornado Warning | MRX | 25 min |
| Jun 17, 10:01 AM EDT | Flash Flood Watch | MRX | 13 hr |
| Jun 17, 12:54 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 17, 1:25 PM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Jun 17, 3:17 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 3:28 PM EDT | Severe Thunderstorm Warning | MRX | 62 min |
| Jun 17, 4:07 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jun 17, 4:53 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 17, 5:04 PM EDT | Severe Thunderstorm Warning | MRX | 56 min |
| Jun 17, 5:29 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jun 17, 6:34 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jun 17, 7:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jun 18, 10:39 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 1:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 18, 1:49 PM EDT | Severe Thunderstorm Warning | MRX | 56 min |
| Jun 20, 8:52 PM EDT | Severe Thunderstorm Warning | MRX | 53 min |
| Jun 22, 11:19 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 22, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 1:57 PM EDT | Severe Thunderstorm Warning | MRX | 63 min |
| Jun 22, 2:36 PM EDT | Severe Thunderstorm Warning | MRX | 54 min |
| Jun 28, 12:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 28, 3:08 PM EDT | Severe Thunderstorm Warning | MRX | 52 min |
| Jun 28, 4:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 28, 5:38 PM EDT | Severe Thunderstorm Warning | MRX | 52 min |
| Jul 1, 12:35 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 30, 3:14 PM EDT | Flood Watch | MRX | 24 hr |
| Aug 1, 3:04 PM EDT | Flood Watch | MRX | 12 hr |
| Aug 4, 3:48 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| Aug 4, 4:25 PM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Aug 4, 4:29 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 4:58 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 4, 5:15 PM EDT | Severe Thunderstorm Warning | MRX | 60 min |
| Aug 11, 11:17 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 11, 11:50 AM EDT | Severe Thunderstorm Warning | MRX | 55 min |
| Aug 11, 12:15 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 19, 3:08 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 7, 2:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 8, 9:41 PM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Sep 9, 9:11 PM EDT | Severe Thunderstorm Warning | MRX | 23 min |
| Sep 20, 2:28 PM EDT | Flood Watch | MRX | 37 hr |
| Sep 25, 5:24 AM EDT | Flash Flood Watch | MRX | 40 hr |
| Sep 26, 12:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 26, 12:57 PM EDT | Areal Flood Warning | MRX | 6 hr |
| Sep 26, 6:47 PM EDT | Areal Flood Warning | MRX | 2 hr |
| Oct 9, 3:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Oct 9, 4:27 PM EDT | Tornado Watch | SPC | 6 hr |
| Oct 9, 6:42 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Oct 9, 6:51 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Oct 9, 7:11 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Oct 9, 7:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Oct 9, 9:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Oct 15, 8:03 AM EDT | Areal Flood Advisory | MRX | 5 hr |
| Oct 17, 3:16 PM EDT | Frost Advisory | MRX | 19 hr |
| Oct 17, 8:59 PM EDT | Freeze Watch | MRX | 13 hr |
| Oct 18, 10:00 AM EDT | Freeze Warning | MRX | 23 hr |
| Oct 19, 2:50 PM EDT | Freeze Warning | MRX | 18 hr |
| Oct 24, 2:12 PM EDT | Frost Advisory | MRX | 19 hr |
| Nov 1, 2:45 PM EST | Frost Advisory | MRX | 18 hr |
| Nov 3, 2:45 PM EST | Frost Advisory | MRX | 19 hr |
| Nov 5, 3:15 AM EST | Frost Advisory | MRX | 30 hr |
| Nov 6, 2:51 PM EST | Frost Advisory | MRX | 17 hr |
| Dec 1, 5:26 PM EST | Wind Advisory | MRX | 31 hr |
| Dec 5, 12:18 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 8, 3:57 AM EST | Wind Advisory | MRX | 39 hr |
| Dec 9, 12:07 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Dec 13, 9:07 PM EST | Dense Fog Advisory | MRX | 13 hr |
| Dec 17, 3:18 PM EST | Winter Weather Advisory | MRX | 37 hr |
| Dec 18, 5:16 PM EST | Areal Flood Advisory | MRX | 119 min |
| Dec 23, 3:39 PM EST | Wind Advisory | MRX | 48 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 | 31 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 36 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 6 |
| Areal Flood Advisory | 12 |
| Winter | |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 5 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 7 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.