Alert archive / Tennessee / Jefferson County
Weather alerts in Jefferson County, Tennessee, 2019
95 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 95
- Warnings
- 31
- Watches
- 8
- Advisories
- 22
- Busiest month
- June26 alerts
- Busiest day
- June 20, 20197 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 18 | 16 | 11% | 6 | 100% | 16 min |
| Flash flood warnings | 3 | 3 | 0% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 5 | 0 | 100% | 3 | 0% | |
| NWS Morristown, TN: severe thunderstorm warnings | 126 | 101 | 20% | 239 | 74% | 20 min |
| NWS Morristown, TN: flash flood warnings | 24 | 12 | 50% | 37 | 51% | 36 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 4, 6:13 PM EST | Special Weather Statement | MRX | 47 min |
| Jan 18, 5:30 AM EST | Dense Fog Advisory | MRX | 5 hr |
| Jan 23, 3:54 AM EST | Wind Advisory | MRX | 18 hr |
| Jan 27, 3:11 PM EST | Winter Storm Watch | MRX | 13 hr |
| Jan 28, 3:56 AM EST | Winter Weather Advisory | MRX | 35 hr |
| Feb 6, 8:37 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 6, 9:09 PM EST | Flash Flood Warning | MRX | 3 hr |
| Feb 6, 11:30 PM EST | Areal Flood Warning | MRX | 3 hr |
| Feb 7, 2:23 AM EST | Areal Flood Warning | MRX | 2 hr |
| Feb 7, 10:26 AM EST | Wind Advisory | MRX | 10 hr |
| Feb 11, 3:16 AM EST | Flash Flood Watch | MRX | 40 hr |
| Feb 19, 10:44 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Feb 21, 11:29 AM EST | Flood Watch | MRX | 68 hr |
| Feb 22, 8:16 AM EST | River Flood Warning | MRX | 53 hr |
| Feb 23, 4:20 AM EST | Areal Flood Advisory | MRX | 5 hr |
| Feb 23, 7:18 AM EST | Areal Flood Warning | MRX | 6 hr |
| Feb 23, 10:14 AM EST | Areal Flood Warning | MRX | 6 hr |
| Feb 23, 11:03 AM EST | Wind Advisory | MRX | 44 hr |
| Feb 23, 1:16 PM EST | Areal Flood Warning | MRX | 3 days |
| Mar 9, 10:55 PM EST | Special Weather Statement | MRX | 65 min |
| Mar 30, 6:00 AM EDT | Freeze Watch | MRX | 22 hr |
| Mar 31, 4:03 AM EDT | Freeze Warning | MRX | 30 hr |
| Apr 8, 12:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Apr 13, 3:14 PM EDT | Wind Advisory | MRX | 29 hr |
| Apr 14, 3:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 4:28 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 14, 6:01 PM EDT | Severe Thunderstorm Warning | MRX | 44 min |
| Apr 19, 1:37 AM EDT | Special Weather Statement | MRX | 38 min |
| Apr 19, 6:32 AM EDT | Severe Thunderstorm Warning | MRX | 43 min |
| Apr 19, 6:33 PM EDT | River Flood Warning | MRX | 36 hr |
| Apr 19, 7:29 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| May 3, 12:16 PM EDT | Special Weather Statement | MRX | 44 min |
| May 3, 12:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 10:41 AM EDT | Mesoscale Discussion | SPC | 94 min |
| May 4, 1:00 PM EDT | Special Weather Statement | MRX | 60 min |
| May 4, 1:34 PM EDT | Special Weather Statement | MRX | 56 min |
| May 4, 1:59 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| May 8, 5:20 PM EDT | Special Weather Statement | MRX | 40 min |
| May 18, 6:55 PM EDT | Special Weather Statement | MRX | 50 min |
| Jun 7, 3:57 PM EDT | Special Weather Statement | MRX | 48 min |
| Jun 17, 2:54 PM EDT | Special Weather Statement | MRX | 51 min |
| Jun 17, 3:15 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jun 17, 4:13 PM EDT | Special Weather Statement | MRX | 47 min |
| Jun 19, 7:47 PM EDT | Areal Flood Advisory | MRX | 58 min |
| Jun 20, 12:54 AM EDT | Special Weather Statement | MRX | 51 min |
| Jun 20, 1:12 AM EDT | Special Weather Statement | MRX | 48 min |
| Jun 20, 7:07 AM EDT | Areal Flood Advisory | MRX | 113 min |
| Jun 20, 7:16 AM EDT | Special Weather Statement | MRX | 44 min |
| Jun 20, 7:26 AM EDT | Severe Thunderstorm Warning | MRX | 64 min |
| Jun 20, 4:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 20, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Jun 21, 10:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 21, 11:37 PM EDT | Severe Thunderstorm Warning | MRX | 38 min |
| Jun 21, 11:55 PM EDT | Severe Thunderstorm Warning | MRX | 50 min |
| Jun 22, 12:06 PM EDT | Special Weather Statement | MRX | 54 min |
| Jun 24, 1:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 24, 1:49 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 4:42 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 24, 5:20 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Jun 24, 5:30 PM EDT | Severe Thunderstorm Warning | MRX | 31 min |
| Jun 28, 2:28 PM EDT | Special Weather Statement | MRX | 32 min |
| Jun 28, 2:42 PM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| Jun 28, 3:10 PM EDT | Special Weather Statement | MRX | 35 min |
| Jun 28, 3:20 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Jun 28, 3:38 PM EDT | Special Weather Statement | MRX | 37 min |
| Jul 4, 5:33 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 13, 2:58 PM EDT | Special Weather Statement | MRX | 47 min |
| Jul 18, 4:29 PM EDT | Areal Flood Advisory | MRX | 45 min |
| Jul 22, 3:18 AM EDT | Flash Flood Watch | MRX | 32 hr |
| Jul 22, 4:30 PM EDT | Special Weather Statement | MRX | 45 min |
| Jul 22, 5:37 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 22, 6:00 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 23, 9:02 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 2, 3:23 PM EDT | Special Weather Statement | MRX | 52 min |
| Aug 3, 5:40 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Aug 4, 2:05 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 12, 3:02 PM EDT | Heat Advisory | MRX | 29 hr |
| Aug 13, 12:00 PM EDT | Mesoscale Discussion | SPC | 105 min |
| Aug 13, 12:36 PM EDT | Special Weather Statement | MRX | 39 min |
| Aug 13, 1:09 PM EDT | Special Weather Statement | MRX | 51 min |
| Aug 19, 5:57 PM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| Aug 22, 7:39 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Aug 22, 8:30 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Sep 27, 1:42 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Oct 17, 3:19 PM EDT | Frost Advisory | MRX | 18 hr |
| Oct 21, 4:01 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Oct 28, 6:11 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Oct 31, 3:16 AM EDT | Freeze Warning | MRX | 31 hr |
| Oct 31, 11:24 AM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Oct 31, 11:44 AM EDT | Severe Thunderstorm Warning | MRX | 33 min |
| Nov 1, 3:32 AM EDT | Freeze Watch | MRX | 12 hr |
| Nov 1, 3:25 PM EDT | Freeze Warning | MRX | 19 hr |
| Dec 16, 9:41 PM EST | Special Weather Statement | MRX | 49 min |
| Dec 25, 2:58 AM EST | Dense Fog Advisory | MRX | 7 hr |
| Dec 30, 1:18 AM EST | Severe Thunderstorm Warning | MRX | 40 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 | 18 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 25 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 3 |
| River Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 9 |
| Winter | |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| 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 archive20182020
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.