Alert archive / Tennessee / Polk County
Weather alerts in Polk County, Tennessee, 2021
110 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Polk County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 110
- Warnings
- 20
- Watches
- 13
- Advisories
- 45
- Busiest month
- March28 alerts
- Busiest day
- March 26, 20216 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Polk County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 7 | 13% | 4 | 100% | 25 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 98 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 8 | 3 | 63% | 2 | 100% | 34 min |
| NWS Morristown, TN: severe thunderstorm warnings | 158 | 123 | 22% | 212 | 82% | 20 min |
| NWS Morristown, TN: flash flood warnings | 44 | 30 | 32% | 67 | 70% | 112 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 6, 3:31 PM EST | Winter Storm Watch | MRX | 24 hr |
| Jan 7, 4:40 AM EST | Winter Storm Warning | MRX | 39 hr |
| Jan 7, 3:51 PM EST | Winter Weather Advisory | MRX | 24 hr |
| Jan 13, 12:56 AM EST | Freezing Fog Advisory | MRX | 9 hr |
| Jan 22, 1:53 AM EST | Dense Fog Advisory | MRX | 7 hr |
| Jan 25, 8:59 PM EST | Special Weather Statement | MRX | 46 min |
| Jan 31, 3:12 PM EST | Winter Weather Advisory | MRX | 46 hr |
| Feb 4, 3:19 AM EST | Wind Advisory | MRX | 23 hr |
| Feb 6, 3:50 AM EST | Winter Weather Advisory | MRX | 30 hr |
| Feb 17, 4:47 AM EST | Winter Weather Advisory | MRX | 30 hr |
| Mar 1, 1:13 AM EST | Special Weather Statement | MRX | 62 min |
| Mar 17, 5:32 PM EDT | Flash Flood Watch | MRX | 14 hr |
| Mar 24, 2:53 PM EDT | Flash Flood Watch | MRX | 37 hr |
| Mar 25, 3:41 AM EDT | Wind Advisory | MRX | 24 hr |
| Mar 25, 11:20 AM EDT | Special Weather Statement | MRX | 40 min |
| Mar 25, 2:28 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Mar 25, 5:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 25, 7:57 PM EDT | Areal Flood Advisory | MRX | 4 hr |
| Mar 25, 10:52 PM EDT | River Flood Warning | MRX | 10 hr |
| Mar 25, 11:06 PM EDT | Special Weather Statement | MRX | 39 min |
| Mar 25, 11:43 PM EDT | Special Weather Statement | MRX | 47 min |
| Mar 25, 11:46 PM EDT | Areal Flood Warning | MRX | 5 hr |
| Mar 25, 11:55 PM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Mar 26, 7:10 PM EDT | Flash Flood Watch | MRX | 44 hr |
| Mar 27, 6:41 AM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Mar 27, 12:55 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 28, 2:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 28, 3:07 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 28, 6:51 AM EDT | Special Weather Statement | MRX | 39 min |
| Mar 28, 7:27 AM EDT | Special Weather Statement | MRX | 63 min |
| Mar 28, 7:52 AM EDT | Flash Flood Warning | MRX | 5 hr |
| Mar 28, 8:03 AM EDT | Flash Flood Warning | MRX | 4 hr |
| Mar 30, 3:46 AM EDT | Flash Flood Watch | MRX | 35 hr |
| Mar 31, 9:52 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Mar 31, 2:04 PM EDT | River Flood Warning | MRX | 14 hr |
| Mar 31, 3:38 PM EDT | Freeze Watch | MRX | 18 hr |
| Mar 31, 3:38 PM EDT | Freeze Warning | MRX | 17 hr |
| Mar 31, 3:38 PM EDT | Wind Advisory | MRX | 12 hr |
| Apr 1, 9:22 AM EDT | Freeze Warning | MRX | 25 hr |
| Apr 1, 3:21 PM EDT | Freeze Warning | MRX | 43 hr |
| Apr 3, 3:20 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 21, 3:04 AM EDT | Frost Advisory | MRX | 30 hr |
| Apr 21, 3:04 AM EDT | Freeze Warning | MRX | 30 hr |
| Apr 29, 12:24 PM EDT | Wind Advisory | MRX | 7 hr |
| May 4, 9:37 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 4, 12:06 PM EDT | Special Weather Statement | MRX | 24 min |
| May 9, 3:36 AM EDT | Wind Advisory | MRX | 16 hr |
| May 28, 5:40 PM EDT | Special Weather Statement | MRX | 65 min |
| Jun 3, 12:51 PM EDT | Special Weather Statement | MRX | 39 min |
| Jun 3, 1:04 PM EDT | Severe Thunderstorm Warning | MRX | 26 min |
| Jun 3, 2:34 PM EDT | Special Weather Statement | MRX | 26 min |
| Jun 4, 5:19 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Jun 7, 10:45 AM EDT | Areal Flood Advisory | MRX | 2 hr |
| Jun 11, 9:03 PM EDT | Special Weather Statement | MRX | 42 min |
| Jul 9, 11:56 AM EDT | Special Weather Statement | MRX | 34 min |
| Jul 9, 12:24 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 9, 12:35 PM EDT | Special Weather Statement | MRX | 40 min |
| Jul 18, 8:48 PM EDT | Areal Flood Advisory | MRX | 117 min |
| Jul 20, 6:36 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 26, 5:45 PM EDT | Special Weather Statement | MRX | 45 min |
| Jul 30, 4:54 PM EDT | Special Weather Statement | MRX | 36 min |
| Aug 11, 4:41 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Aug 11, 5:23 PM EDT | Special Weather Statement | MRX | 37 min |
| Aug 11, 5:28 PM EDT | Severe Thunderstorm Warning | MRX | 47 min |
| Aug 11, 5:50 PM EDT | Severe Thunderstorm Warning | MRX | 40 min |
| Aug 11, 6:17 PM EDT | Areal Flood Advisory | MRX | 118 min |
| Aug 14, 8:49 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 16, 3:10 AM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 16, 2:06 PM EDT | Flood Watch | MRX | 32 min |
| Aug 16, 2:38 PM EDT | Flash Flood Watch | MRX | 33 hr |
| Aug 17, 11:54 AM EDT | Special Weather Statement | MRX | 51 min |
| Aug 17, 4:09 PM EDT | Areal Flood Advisory | MRX | 4 hr |
| Aug 26, 4:18 PM EDT | Special Weather Statement | MRX | 42 min |
| Aug 26, 4:36 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 26, 5:13 PM EDT | Special Weather Statement | MRX | 47 min |
| Aug 26, 5:45 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 27, 3:11 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Aug 30, 3:35 AM EDT | Flash Flood Watch | MRX | 48 hr |
| Aug 30, 5:18 PM EDT | Special Weather Statement | MRX | 57 min |
| Aug 30, 5:24 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 30, 6:06 PM EDT | Areal Flood Advisory | MRX | 114 min |
| Aug 31, 10:23 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 31, 12:44 PM EDT | Areal Flood Advisory | MRX | 9 hr |
| Aug 31, 5:24 PM EDT | Areal Flood Advisory | MRX | 5 hr |
| Sep 13, 5:05 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Oct 5, 2:57 PM EDT | Flash Flood Watch | MRX | 41 hr |
| Oct 9, 5:28 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Oct 15, 6:16 AM EDT | Dense Fog Advisory | MRX | 4 hr |
| Oct 21, 3:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 21, 7:51 PM EDT | Special Weather Statement | MRX | 39 min |
| Oct 21, 8:26 PM EDT | Special Weather Statement | MRX | 49 min |
| Oct 21, 8:57 PM EDT | Special Weather Statement | MRX | 48 min |
| Oct 28, 3:05 AM EDT | Wind Advisory | MRX | 17 hr |
| Nov 4, 2:59 AM EDT | Frost Advisory | MRX | 31 hr |
| Nov 5, 3:58 AM EDT | Dense Fog Advisory | MRX | 6 hr |
| Nov 5, 3:03 PM EDT | Frost Advisory | MRX | 18 hr |
| Nov 6, 2:59 PM EDT | Frost Advisory | MRX | 19 hr |
| Nov 6, 4:43 PM EDT | Freeze Warning | MRX | 17 hr |
| Nov 7, 6:01 PM EST | Frost Advisory | MRX | 14 hr |
| Nov 12, 3:01 PM EST | Freeze Watch | MRX | 13 hr |
| Nov 13, 3:40 AM EST | Freeze Warning | MRX | 28 hr |
| Dec 10, 2:08 PM EST | Wind Advisory | MRX | 25 hr |
| Dec 11, 10:15 AM EST | Severe Thunderstorm Warning | MRX | 45 min |
| Dec 11, 10:59 AM EST | Special Weather Statement | MRX | 46 min |
| Dec 29, 8:27 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 29, 9:08 PM EST | Severe Thunderstorm Warning | MRX | 24 min |
| Dec 29, 9:31 PM EST | Special Weather Statement | MRX | 29 min |
| Dec 29, 9:44 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 30, 7:21 AM EST | Dense Fog Advisory | MRX | 3 hr |
| Dec 31, 12:40 AM EST | Dense Fog Advisory | MRX | 9 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 | 8 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 26 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| River Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Areal Flood Advisory | 18 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 2 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.