Alert archive / Tennessee / Jefferson County
Weather alerts in Jefferson County, Tennessee, 2020
116 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 116
- Warnings
- 32
- Watches
- 7
- Advisories
- 38
- Busiest month
- February18 alerts
- Busiest day
- February 6, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 18 | 16 | 11% | 8 | 88% | 20 min |
| Flash flood warnings | 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 3, 4:57 AM EST | Areal Flood Advisory | MRX | 4 hr |
| Jan 10, 2:39 PM EST | Wind Advisory | MRX | 34 hr |
| Jan 11, 4:16 PM EST | Mesoscale Discussion | SPC | 89 min |
| Jan 11, 4:50 PM EST | Severe Thunderstorm Warning | MRX | 40 min |
| Jan 11, 4:56 PM EST | Severe Thunderstorm Warning | MRX | 49 min |
| Jan 11, 5:23 PM EST | Severe Thunderstorm Warning | MRX | 52 min |
| Jan 11, 6:02 PM EST | Severe Thunderstorm Warning | MRX | 43 min |
| Feb 4, 3:46 PM EST | Flash Flood Watch | MRX | 47 hr |
| Feb 5, 5:18 PM EST | Areal Flood Warning | MRX | 27 hr |
| Feb 5, 10:31 PM EST | Special Weather Statement | MRX | 44 min |
| Feb 5, 11:28 PM EST | Areal Flood Advisory | MRX | 5 hr |
| Feb 6, 3:15 AM EST | Areal Flood Warning | MRX | 6 hr |
| Feb 6, 3:57 AM EST | Areal Flood Warning | MRX | 15 hr |
| Feb 6, 6:21 AM EST | River Flood Warning | MRX | 51 hr |
| Feb 6, 9:03 AM EST | Areal Flood Warning | MRX | 12 hr |
| Feb 6, 6:34 PM EST | Areal Flood Warning | MRX | 18 hr |
| Feb 6, 8:04 PM EST | Areal Flood Warning | MRX | 15 hr |
| Feb 6, 8:41 PM EST | Areal Flood Warning | MRX | 15 hr |
| Feb 7, 11:31 AM EST | Areal Flood Warning | MRX | 9 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 11, 11:32 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 12, 9:22 PM EST | Severe Thunderstorm Warning | MRX | 53 min |
| Feb 12, 9:59 PM EST | Special Weather Statement | MRX | 61 min |
| Feb 13, 9:48 AM EST | River Flood Warning | MRX | 14 hr |
| Mar 3, 4:28 AM EST | Special Weather Statement | MRX | 47 min |
| Mar 3, 4:57 AM EST | Special Weather Statement | MRX | 63 min |
| Mar 3, 5:42 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 3, 6:02 AM EST | Special Weather Statement | MRX | 43 min |
| Mar 3, 6:05 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 3, 6:36 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Mar 3, 8:39 AM EST | Areal Flood Advisory | MRX | 111 min |
| Mar 18, 3:59 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Mar 25, 9:29 AM EDT | River Flood Advisory | MRX | 12 hr |
| Mar 29, 5:53 AM EDT | Special Weather Statement | MRX | 37 min |
| Mar 29, 6:11 AM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Apr 8, 11:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 9, 2:17 AM EDT | Special Weather Statement | MRX | 43 min |
| Apr 10, 3:32 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 11, 9:32 PM EDT | Wind Advisory | MRX | 42 hr |
| Apr 13, 12:43 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Apr 13, 1:58 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Apr 13, 8:21 AM EDT | River Flood Warning | MRX | 48 hr |
| Apr 15, 3:24 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 16, 3:34 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 25, 6:11 PM EDT | Tornado Watch | SPC | 4 hr |
| Apr 25, 7:22 PM EDT | Special Weather Statement | MRX | 38 min |
| Apr 25, 9:03 PM EDT | Special Weather Statement | MRX | 42 min |
| Apr 29, 5:45 PM EDT | Special Weather Statement | MRX | 45 min |
| Apr 30, 9:19 AM EDT | River Flood Advisory | MRX | 23 hr |
| May 8, 3:56 AM EDT | Frost Advisory | MRX | 30 hr |
| May 9, 3:26 AM EDT | Frost Advisory | MRX | 31 hr |
| May 20, 10:14 AM EDT | River Flood Warning | MRX | 47 hr |
| May 23, 2:58 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| May 24, 2:59 PM EDT | Severe Thunderstorm Warning | MRX | 31 min |
| May 28, 3:03 PM EDT | Special Weather Statement | MRX | 27 min |
| May 28, 3:06 PM EDT | Special Weather Statement | MRX | 39 min |
| May 28, 7:46 PM EDT | Special Weather Statement | MRX | 29 min |
| May 28, 8:14 PM EDT | Special Weather Statement | MRX | 46 min |
| Jun 10, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 14, 12:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 14, 1:00 PM EDT | Severe Thunderstorm Warning | MRX | 34 min |
| Jun 15, 1:01 PM EDT | Special Weather Statement | MRX | 59 min |
| Jun 15, 2:06 PM EDT | Special Weather Statement | MRX | 39 min |
| Jun 15, 2:48 PM EDT | Special Weather Statement | MRX | 42 min |
| Jun 21, 3:40 PM EDT | Special Weather Statement | MRX | 35 min |
| Jun 21, 3:43 PM EDT | Severe Thunderstorm Warning | MRX | 47 min |
| Jun 21, 4:06 PM EDT | Special Weather Statement | MRX | 39 min |
| Jun 21, 4:10 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Jun 21, 8:03 PM EDT | Special Weather Statement | MRX | 42 min |
| Jun 28, 12:49 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 5:34 PM EDT | Special Weather Statement | MRX | 41 min |
| Jul 5, 4:15 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 19, 8:01 PM EDT | Special Weather Statement | MRX | 44 min |
| Jul 19, 8:06 PM EDT | Severe Thunderstorm Warning | MRX | 25 min |
| Jul 20, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 3:59 PM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Jul 24, 4:34 PM EDT | Severe Thunderstorm Warning | MRX | 56 min |
| Jul 24, 4:56 PM EDT | Severe Thunderstorm Warning | MRX | 52 min |
| Jul 24, 5:35 PM EDT | Severe Thunderstorm Warning | MRX | 30 min |
| Jul 24, 6:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 25, 2:48 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 25, 3:07 PM EDT | Special Weather Statement | MRX | 38 min |
| Jul 25, 4:22 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 30, 4:50 PM EDT | Special Weather Statement | MRX | 40 min |
| Jul 31, 5:52 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 31, 6:16 PM EDT | Severe Thunderstorm Warning | MRX | 29 min |
| Aug 3, 9:04 AM EDT | Special Weather Statement | MRX | 41 min |
| Aug 10, 4:14 PM EDT | Special Weather Statement | MRX | 46 min |
| Aug 15, 9:02 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 16, 4:41 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Aug 21, 8:50 PM EDT | Special Weather Statement | MRX | 40 min |
| Aug 21, 8:55 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 26, 4:59 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Sep 3, 3:05 PM EDT | Special Weather Statement | MRX | 55 min |
| Sep 3, 3:24 PM EDT | Severe Thunderstorm Warning | MRX | 34 min |
| Sep 4, 6:28 PM EDT | Special Weather Statement | MRX | 47 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 28, 10:47 AM EDT | Wind Advisory | MRX | 28 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 14, 4:04 AM EST | Wind Advisory | MRX | 39 hr |
| 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 |
| Dec 24, 2:28 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 29, 1:41 AM EST | Dense Fog Advisory | MRX | 6 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 | 18 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 30 |
| Flooding | |
| Areal Flood Warning | 8 |
| River Flood Warning | 4 |
| Flash Flood Watch | 3 |
| Flood Watch | 1 |
| Areal Flood Advisory | 14 |
| River Flood Advisory | 2 |
| Winter | |
| Winter Weather Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 7 |
| Wind and dust | |
| Wind Advisory | 5 |
| 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.