Alert archive / Tennessee / Polk County
Weather alerts in Polk County, Tennessee, 2012
132 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 132
- Warnings
- 37
- Watches
- 19
- Advisories
- 40
- Busiest month
- March20 alerts
- Busiest day
- March 2, 201210 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 6 tornado warnings covering Polk County in 2012 had a tornado report inside them.
Polk County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 2 | 67% | 0 | ||
| Severe thunderstorm warnings | 25 | 17 | 32% | 7 | 71% | 45 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 121 min |
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 17, 5:26 PM EST | Severe Thunderstorm Warning | MRX | 49 min |
| Jan 21, 5:20 AM EST | Mesoscale Discussion | SPC | 55 min |
| Jan 21, 5:55 AM EST | Tornado Watch | SPC | 7 hr |
| Jan 21, 8:22 AM EST | Mesoscale Discussion | SPC | 83 min |
| Jan 23, 2:54 AM EST | Severe Thunderstorm Watch | SPC | 3 hr |
| Jan 23, 5:28 AM EST | Mesoscale Discussion | SPC | 62 min |
| Feb 10, 1:03 PM EST | Wind Advisory | MRX | 30 hr |
| Feb 13, 4:20 AM EST | Winter Weather 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, 3:08 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 22, 7:34 PM EST | Severe Thunderstorm Warning | MRX | 26 min |
| Feb 22, 8:20 PM EST | Severe Thunderstorm Warning | MRX | 40 min |
| Feb 22, 9:11 PM EST | Severe Thunderstorm Warning | MRX | 34 min |
| Feb 23, 3:37 PM EST | Wind Advisory | MRX | 27 hr |
| Feb 24, 2:00 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 24, 9:05 AM EST | Mesoscale Discussion | SPC | 25 min |
| Feb 25, 2:50 AM EST | Wind Advisory | MRX | 13 hr |
| Feb 29, 5:36 PM EST | Mesoscale Discussion | SPC | 54 min |
| Feb 29, 6:37 PM EST | Tornado Watch | SPC | 3 hr |
| Mar 2, 3:30 AM EST | Mesoscale Discussion | SPC | 90 min |
| Mar 2, 10:07 AM EST | Mesoscale Discussion | SPC | 53 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, 12:50 PM EST | Tornado Warning | MRX | 25 min |
| Mar 2, 1:23 PM EST | Tornado Warning | MRX | 37 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, 6:41 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 2, 7:06 PM EST | Tornado Warning | MRX | 39 min |
| Mar 2, 7:49 PM EST | Tornado Warning | MRX | 26 min |
| Mar 2, 8:10 PM EST | Tornado Warning | MRX | 35 min |
| Mar 2, 8:15 PM EST | Mesoscale Discussion | SPC | 90 min |
| Mar 2, 8:35 PM EST | Tornado Warning | MRX | 40 min |
| Mar 15, 7:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Mar 15, 9:52 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Mar 16, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 31, 1:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 31, 6:00 PM EDT | Mesoscale Discussion | SPC | 30 min |
| Apr 1, 3:54 AM EDT | Dense Fog Advisory | MRX | 5 hr |
| Apr 2, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 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 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 12, 3:00 PM EDT | Frost Advisory | MRX | 18 hr |
| Apr 26, 7:24 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 26, 8:10 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 26, 8:47 AM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 26, 9:10 AM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Apr 26, 5:54 PM EDT | Severe Thunderstorm Warning | MRX | 66 min |
| Apr 26, 7:09 PM EDT | Severe Thunderstorm Warning | MRX | 42 min |
| Apr 26, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| May 24, 3:30 AM EDT | Dense Fog Advisory | MRX | 7 hr |
| Jun 4, 2:26 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 21, 11:24 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 29, 4:17 AM EDT | Heat Advisory | MRX | 4 days |
| Jul 1, 11:00 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 1, 11:30 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jul 2, 12:17 AM EDT | Severe Thunderstorm Warning | MRX | 23 min |
| Jul 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 4, 4:22 PM EDT | Areal Flood Advisory | MRX | 79 min |
| Jul 5, 3:38 AM EDT | Heat Advisory | MRX | 17 hr |
| Jul 5, 1:11 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 5, 2:50 PM EDT | Heat Advisory | MRX | 13 hr |
| Jul 5, 3:19 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 5, 6:29 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| Jul 5, 7:25 PM EDT | Severe Thunderstorm Warning | MRX | 37 min |
| Jul 6, 3:28 PM EDT | Heat Advisory | MRX | 30 hr |
| Jul 9, 1:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 10, 12:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 2:25 PM EDT | Severe Thunderstorm Warning | MRX | 65 min |
| Jul 10, 3:03 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jul 10, 3:07 PM EDT | Severe Thunderstorm Warning | MRX | 53 min |
| Jul 17, 4:35 PM EDT | Severe Thunderstorm Warning | MRX | 25 min |
| Jul 27, 1:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 28, 1:57 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 31, 9:13 PM EDT | Severe Thunderstorm Warning | MRX | 47 min |
| Jul 31, 10:15 PM EDT | Severe Thunderstorm Warning | MRX | 60 min |
| Jul 31, 11:14 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| Aug 1, 2:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 1, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 6:44 PM EDT | Severe Thunderstorm Warning | MRX | 31 min |
| Aug 1, 6:49 PM EDT | Areal Flood Advisory | MRX | 116 min |
| Aug 1, 7:54 PM EDT | Severe Thunderstorm Warning | MRX | 36 min |
| Aug 1, 8:18 PM EDT | Areal Flood Advisory | MRX | 117 min |
| Aug 1, 8:28 PM EDT | Severe Thunderstorm Warning | MRX | 32 min |
| Aug 1, 8:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 4, 2:57 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 7, 10:15 PM EDT | Dense Fog Advisory | MRX | 8 hr |
| Aug 9, 12:57 PM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| Aug 9, 1:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 9, 1:42 PM EDT | Severe Thunderstorm Warning | MRX | 63 min |
| Aug 9, 1:58 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 10, 5:26 PM EDT | Severe Thunderstorm Warning | MRX | 49 min |
| Aug 10, 6:08 PM EDT | Severe Thunderstorm Warning | MRX | 67 min |
| Sep 2, 6:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Sep 2, 6:33 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 2, 9:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Sep 17, 3:23 AM EDT | Flood Watch | MRX | 39 hr |
| Sep 17, 4:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 17, 6:39 PM EDT | Tornado Watch | SPC | 8 hr |
| Sep 17, 8:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 17, 8:37 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 18, 6:00 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 23, 3:04 PM EDT | Frost Advisory | MRX | 18 hr |
| Oct 1, 12:05 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Oct 1, 4:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 1, 8:06 PM EDT | Tornado Watch | SPC | 3 hr |
| Oct 10, 3:06 AM EDT | Frost Advisory | MRX | 30 hr |
| Oct 20, 3:05 PM EDT | Frost Advisory | MRX | 12 hr |
| Oct 28, 3:13 AM EDT | High Wind Watch | MRX | 13 hr |
| Oct 28, 3:13 AM EDT | Wind Advisory | MRX | 65 hr |
| Oct 28, 3:39 AM EDT | Frost Advisory | MRX | 12 hr |
| Oct 28, 3:39 AM EDT | Freeze Warning | MRX | 29 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 9, 3:10 PM EST | Wind Advisory | MRX | 27 hr |
| Dec 20, 3:31 AM EST | Wind Advisory | MRX | 39 hr |
| Dec 24, 2:52 PM EST | High Wind Watch | MRX | 19 hr |
| Dec 24, 3:29 PM EST | Dense Fog Advisory | MRX | 19 hr |
| Dec 25, 10:11 AM EST | High Wind Warning | MRX | 27 hr |
| Dec 25, 3:13 PM EST | Wind Advisory | MRX | 37 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 | 25 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 36 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flood Watch | 2 |
| Areal Flood Advisory | 11 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 8 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 9 |
| 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.