Alert archive / Tennessee / Anderson County
Weather alerts in Anderson County, Tennessee, 2012
103 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Anderson County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 103
- Warnings
- 36
- Watches
- 16
- Advisories
- 27
- Busiest month
- April23 alerts
- Busiest day
- April 26, 20128 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 5 tornado warnings covering Anderson County in 2012 had a tornado report inside them.
Anderson County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 1 | 80% | 0 | ||
| Severe thunderstorm warnings | 28 | 18 | 36% | 10 | 70% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 81 | 12 | 85% | 23 | 83% | 19 min |
| NWS Morristown, TN: severe thunderstorm warnings | 311 | 198 | 36% | 358 | 78% | 22 min |
| NWS Morristown, TN: flash flood warnings | 16 | 8 | 50% | 14 | 93% | 63 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 9, 9:11 PM EST | Dense Fog Advisory | MRX | 8 hr |
| Jan 11, 3:30 PM EST | Winter Weather Advisory | MRX | 45 hr |
| Jan 12, 3:38 AM EST | Wind Advisory | MRX | 24 hr |
| Jan 23, 2:25 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 23, 2:54 AM EST | Severe Thunderstorm Watch | SPC | 3 hr |
| Jan 23, 5:28 AM EST | Mesoscale Discussion | SPC | 62 min |
| Jan 23, 7:32 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 10, 1:03 PM EST | Wind Advisory | MRX | 30 hr |
| Feb 14, 6:47 PM EST | Dense Fog Advisory | MRX | 15 hr |
| Feb 21, 12:24 PM EST | Wind Advisory | MRX | 7 hr |
| Feb 22, 5:55 PM EST | Severe Thunderstorm Warning | MRX | 50 min |
| Feb 22, 6:51 PM EST | Severe Thunderstorm Warning | MRX | 39 min |
| Feb 22, 7:28 PM EST | Severe Thunderstorm Warning | MRX | 32 min |
| Feb 22, 7:34 PM EST | Severe Thunderstorm Warning | MRX | 26 min |
| Feb 22, 7:52 PM EST | Severe Thunderstorm Warning | MRX | 38 min |
| Feb 23, 3:37 PM EST | Wind Advisory | MRX | 27 hr |
| Feb 24, 2:00 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 29, 12:11 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 29, 12:31 PM EST | Tornado Watch | SPC | 8 hr |
| Feb 29, 4:34 PM EST | Mesoscale Discussion | SPC | 116 min |
| Feb 29, 5:17 PM EST | Severe Thunderstorm Warning | MRX | 58 min |
| Feb 29, 5:36 PM EST | Tornado Warning | MRX | 39 min |
| Feb 29, 5:37 PM EST | Tornado Warning | MRX | 38 min |
| Feb 29, 8:33 PM EST | Mesoscale Discussion | SPC | 57 min |
| Mar 1, 12:20 AM EST | Mesoscale Discussion | SPC | 85 min |
| Mar 2, 10:25 AM EST | Tornado Watch | SPC | 5 hr |
| Mar 2, 10:59 AM EST | Flood Watch | MRX | 14 hr |
| Mar 2, 12:46 PM EST | Mesoscale Discussion | SPC | 29 min |
| Mar 2, 2:58 PM EST | Mesoscale Discussion | SPC | 62 min |
| Mar 2, 3:19 PM EST | Tornado Watch | SPC | 8 hr |
| Mar 2, 5:29 PM EST | Tornado Warning | MRX | 31 min |
| Mar 2, 8:15 PM EST | Mesoscale Discussion | SPC | 90 min |
| Mar 2, 8:29 PM EST | Severe Thunderstorm Warning | MRX | 46 min |
| Mar 2, 9:05 PM EST | Tornado Warning | MRX | 40 min |
| Mar 2, 9:14 PM EST | Severe Thunderstorm Warning | MRX | 46 min |
| Mar 2, 9:41 PM EST | Tornado Warning | MRX | 34 min |
| Mar 15, 2:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 15, 7:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Mar 24, 2:18 AM EDT | Areal Flood Advisory | MRX | 117 min |
| Mar 31, 2:30 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Apr 1, 3:54 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Apr 1, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 1, 2:41 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Apr 1, 3:29 PM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Apr 5, 12:51 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Apr 5, 1:40 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Apr 5, 1:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 5, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 5, 4:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 5, 7:32 PM EDT | Severe Thunderstorm Warning | MRX | 28 min |
| Apr 6, 3:21 AM EDT | Frost Advisory | MRX | 31 hr |
| Apr 10, 3:35 AM EDT | Frost Advisory | MRX | 29 hr |
| Apr 10, 8:49 PM EDT | Freeze Watch | MRX | 18 hr |
| Apr 11, 3:01 PM EDT | Freeze Warning | MRX | 18 hr |
| Apr 22, 4:33 AM EDT | Wind Advisory | MRX | 48 hr |
| Apr 26, 5:07 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 26, 6:14 AM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Apr 26, 6:22 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 26, 6:44 AM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Apr 26, 7:24 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 26, 4:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 26, 6:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 26, 7:31 PM EDT | Severe Thunderstorm Warning | MRX | 24 min |
| May 18, 5:39 PM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| May 24, 3:30 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Jun 29, 4:17 AM EDT | Heat Advisory | MRX | 4 days |
| Jul 1, 5:40 PM EDT | Severe Thunderstorm Warning | MRX | 35 min |
| Jul 1, 6:33 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Jul 1, 10:50 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Jul 5, 3:19 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 5, 5:16 PM EDT | Severe Thunderstorm Warning | MRX | 59 min |
| Jul 5, 5:51 PM EDT | Severe Thunderstorm Warning | MRX | 54 min |
| Jul 10, 5:03 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| Jul 17, 2:35 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Jul 18, 1:48 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 19, 7:42 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 19, 8:35 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 19, 11:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 19, 11:55 PM EDT | Areal Flood Advisory | MRX | 79 min |
| Aug 1, 2:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 1, 3:25 PM EDT | Severe Thunderstorm Warning | MRX | 35 min |
| Aug 1, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 5:00 PM EDT | Severe Thunderstorm Warning | MRX | 30 min |
| Aug 6, 4:27 AM EDT | Flood Watch | MRX | 11 hr |
| Aug 6, 3:19 PM EDT | Flood Watch | MRX | 5 hr |
| Aug 7, 10:15 PM EDT | Dense Fog Advisory | MRX | 8 hr |
| Aug 9, 1:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 9, 4:21 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 10, 12:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Sep 17, 3:23 AM EDT | Flood Watch | MRX | 39 hr |
| Sep 18, 12:28 AM EDT | Areal Flood Advisory | MRX | 6 hr |
| Sep 18, 2:59 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Oct 1, 8:06 PM EDT | Tornado Watch | SPC | 3 hr |
| Oct 10, 3:06 AM EDT | Frost Advisory | MRX | 30 hr |
| Oct 14, 11:06 PM EDT | Severe Thunderstorm Warning | MRX | 39 min |
| Oct 28, 3:13 AM EDT | Wind Advisory | MRX | 65 hr |
| Oct 28, 3:39 AM EDT | Frost Advisory | MRX | 12 hr |
| Oct 31, 4:14 AM EDT | Freeze Watch | MRX | 11 hr |
| Oct 31, 3:02 PM EDT | Freeze Warning | MRX | 18 hr |
| Nov 4, 9:52 PM EST | Frost Advisory | MRX | 11 hr |
| Nov 8, 3:19 PM EST | Freeze Warning | MRX | 17 hr |
| Dec 20, 3:31 AM EST | Wind Advisory | MRX | 39 hr |
| Dec 24, 3:29 PM EST | Dense Fog Advisory | MRX | 19 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 | 28 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 24 |
| Flooding | |
| Flood Watch | 4 |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.