Alert archive / Tennessee / Anderson County
Weather alerts in Anderson County, Tennessee, 2020
111 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 111
- Warnings
- 24
- Watches
- 13
- Advisories
- 39
- Busiest month
- July22 alerts
- Busiest day
- March 3, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Anderson County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 13 | 13% | 4 | 25% | 25 min |
| Flash flood warnings | 2 | 2 | 0% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 13 | 5 | 62% | 6 | 83% | 6 min |
| NWS Morristown, TN: severe thunderstorm warnings | 158 | 129 | 18% | 243 | 81% | 21 min |
| NWS Morristown, TN: flash flood warnings | 22 | 18 | 18% | 33 | 82% | 42 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 1, 3:26 AM EST | Flood Watch | MRX | 64 hr |
| Jan 2, 11:34 PM EST | Areal Flood Advisory | MRX | 5 hr |
| Jan 3, 4:56 AM EST | Areal Flood Advisory | MRX | 4 hr |
| Jan 10, 2:39 PM EST | Wind Advisory | MRX | 34 hr |
| Jan 11, 1:42 PM EST | Tornado Watch | SPC | 7 hr |
| Jan 11, 4:16 PM EST | Severe Thunderstorm Warning | MRX | 44 min |
| Jan 11, 4:16 PM EST | Mesoscale Discussion | SPC | 89 min |
| Jan 11, 4:56 PM EST | Severe Thunderstorm Warning | MRX | 49 min |
| Feb 4, 3:46 PM EST | Flash Flood Watch | MRX | 47 hr |
| Feb 5, 9:51 PM EST | Special Weather Statement | MRX | 39 min |
| Feb 5, 10:20 PM EST | Areal Flood Advisory | MRX | 5 hr |
| Feb 6, 3:15 AM EST | Areal Flood Warning | MRX | 6 hr |
| Feb 6, 9:03 AM EST | Areal Flood Warning | MRX | 12 hr |
| Feb 6, 8:41 PM EST | Areal Flood Warning | MRX | 15 hr |
| Feb 9, 3:35 AM EST | Flood Watch | MRX | 36 hr |
| Feb 10, 3:14 PM EST | Flash Flood Watch | MRX | 24 hr |
| Feb 12, 3:03 AM EST | Flash Flood Watch | MRX | 31 hr |
| Feb 12, 8:17 PM EST | Special Weather Statement | MRX | 58 min |
| Feb 12, 8:37 PM EST | Mesoscale Discussion | SPC | 83 min |
| Feb 12, 8:38 PM EST | Severe Thunderstorm Warning | MRX | 52 min |
| Feb 12, 9:22 PM EST | Severe Thunderstorm Warning | MRX | 53 min |
| Mar 3, 3:12 AM EST | Special Weather Statement | MRX | 48 min |
| Mar 3, 3:27 AM EST | Severe Thunderstorm Warning | MRX | 48 min |
| Mar 3, 4:12 AM EST | Special Weather Statement | MRX | 33 min |
| Mar 3, 5:19 AM EST | Special Weather Statement | MRX | 41 min |
| Mar 3, 5:42 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 3, 6:36 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 18, 3:59 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Mar 29, 4:23 AM EDT | Severe Thunderstorm Warning | MRX | 37 min |
| Mar 29, 5:23 AM EDT | Severe Thunderstorm Warning | MRX | 37 min |
| Apr 8, 10:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Apr 8, 11:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 9, 3:13 PM EDT | Freeze Watch | MRX | 12 hr |
| Apr 10, 3:35 AM EDT | Freeze Warning | MRX | 30 hr |
| Apr 11, 9:32 PM EDT | Wind Advisory | MRX | 42 hr |
| Apr 11, 9:41 PM EDT | Flash Flood Watch | MRX | 32 hr |
| Apr 12, 9:40 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Apr 13, 12:43 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Apr 14, 3:40 PM EDT | Freeze Warning | MRX | 18 hr |
| Apr 15, 3:24 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 25, 3:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 25, 5:55 PM EDT | Special Weather Statement | MRX | 50 min |
| Apr 25, 6:03 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Apr 25, 6:11 PM EDT | Tornado Watch | SPC | 4 hr |
| Apr 25, 6:40 PM EDT | Special Weather Statement | MRX | 50 min |
| Apr 27, 4:11 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Apr 29, 4:57 PM EDT | Special Weather Statement | MRX | 48 min |
| May 3, 4:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 3, 6:52 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 3, 7:57 PM EDT | Special Weather Statement | MRX | 33 min |
| May 8, 3:56 AM EDT | Frost Advisory | MRX | 30 hr |
| May 9, 3:26 AM EDT | Frost Advisory | MRX | 31 hr |
| May 23, 2:58 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Jun 10, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 10, 6:45 PM EDT | Special Weather Statement | MRX | 45 min |
| Jun 14, 2:26 PM EDT | Special Weather Statement | MRX | 49 min |
| Jun 20, 3:16 PM EDT | Special Weather Statement | MRX | 44 min |
| Jun 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 2:33 PM EDT | Special Weather Statement | MRX | 27 min |
| Jun 22, 9:56 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Jun 28, 12:49 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 5:07 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 29, 6:23 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 29, 8:06 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 1, 6:37 PM EDT | Areal Flood Advisory | MRX | 113 min |
| Jul 1, 7:01 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 5, 4:42 PM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 19, 4:54 PM EDT | Special Weather Statement | MRX | 51 min |
| Jul 20, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 1:06 PM EDT | Special Weather Statement | MRX | 39 min |
| Jul 20, 9:02 PM EDT | Special Weather Statement | MRX | 43 min |
| Jul 20, 9:15 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 3:18 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 24, 3:44 PM EDT | Special Weather Statement | MRX | 46 min |
| Jul 24, 3:49 PM EDT | Areal Flood Advisory | MRX | 116 min |
| Jul 24, 4:15 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 25, 1:25 PM EDT | Severe Thunderstorm Warning | MRX | 35 min |
| Jul 25, 1:40 PM EDT | Areal Flood Advisory | MRX | 110 min |
| Jul 28, 8:52 AM EDT | Areal Flood Advisory | MRX | 113 min |
| Jul 28, 2:33 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 31, 5:52 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 31, 1:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 31, 5:10 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Jul 31, 5:24 PM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Aug 3, 7:48 PM EDT | Areal Flood Advisory | MRX | 117 min |
| Aug 10, 10:40 AM EDT | Special Weather Statement | MRX | 50 min |
| Aug 10, 2:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 15, 7:25 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 16, 4:41 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Aug 25, 4:52 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 26, 4:59 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Aug 31, 12:18 AM EDT | Areal Flood Advisory | MRX | 117 min |
| Sep 3, 1:42 PM EDT | Special Weather Statement | MRX | 48 min |
| Sep 27, 3:43 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Oct 16, 3:12 AM EDT | Frost Advisory | MRX | 31 hr |
| Oct 28, 3:52 AM EDT | Flash Flood Watch | MRX | 30 hr |
| Oct 29, 6:00 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Oct 30, 3:18 PM EDT | Frost Advisory | MRX | 18 hr |
| Oct 30, 3:18 PM EDT | Freeze Watch | MRX | 37 hr |
| Nov 1, 3:16 AM EST | Freeze Warning | MRX | 30 hr |
| Nov 2, 2:39 PM EST | Freeze Warning | MRX | 18 hr |
| Nov 11, 12:07 PM EST | Areal Flood Advisory | MRX | 6 hr |
| Nov 14, 4:04 AM EST | Wind Advisory | MRX | 39 hr |
| Nov 15, 11:01 AM EST | Special Weather Statement | MRX | 44 min |
| Dec 6, 2:33 AM EST | Freezing Fog Advisory | MRX | 7 hr |
| Dec 13, 5:28 AM EST | Dense Fog Advisory | MRX | 4 hr |
| Dec 21, 3:36 AM EST | Dense Fog Advisory | MRX | 5 hr |
| Dec 23, 2:14 PM EST | Winter Weather Advisory | MRX | 38 hr |
| Dec 23, 11:37 PM EST | Wind Advisory | MRX | 10 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 | 15 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 22 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Flood Watch | 2 |
| Areal Flood Advisory | 20 |
| Winter | |
| Winter Weather Advisory | 1 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.