Alert archive / Tennessee / Marion County
Weather alerts in Marion County, Tennessee, 2009
135 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Marion County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 135
- Warnings
- 35
- Watches
- 27
- Advisories
- 33
- Busiest month
- June23 alerts
- Busiest day
- April 10, 20095 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 3 tornado warnings covering Marion County in 2009 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 4 minutes after it went out.
Marion County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 2 | 100% | 4 min |
| Severe thunderstorm warnings | 19 | 13 | 32% | 13 | 92% | 26 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 41 | 11 | 73% | 14 | 93% | 22 min |
| NWS Morristown, TN: severe thunderstorm warnings | 335 | 252 | 25% | 434 | 87% | 26 min |
| NWS Morristown, TN: flash flood warnings | 39 | 29 | 26% | 59 | 76% | 75 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 11:43 PM CST | Dense Fog Advisory | MRX | 9 hr |
| Jan 5, 2:51 AM CST | Flood Watch | MRX | 51 hr |
| Jan 6, 9:32 AM CST | Areal Flood Warning | MRX | 8 hr |
| Jan 6, 10:36 AM CST | River Flood Warning | MRX | 43 hr |
| Jan 6, 4:55 PM CST | Areal Flood Warning | MRX | 16 hr |
| Jan 17, 9:37 PM CST | Freezing Rain Advisory | MRX | 11 hr |
| Feb 2, 9:38 AM CST | Winter Weather Advisory | MRX | 5 hr |
| Feb 3, 1:57 PM CST | Wind Chill Advisory | MRX | 22 hr |
| Feb 10, 10:45 AM CST | High Wind Watch | MRX | 3 hr |
| Feb 10, 1:56 PM CST | High Wind Warning | MRX | 36 hr |
| Feb 10, 1:56 PM CST | Wind Advisory | MRX | 45 hr |
| Feb 11, 10:02 AM CST | Mesoscale Discussion | SPC | 88 min |
| Feb 11, 11:10 AM CST | Tornado Watch | SPC | 6 hr |
| Feb 11, 1:18 PM CST | Severe Thunderstorm Warning | MRX | 72 min |
| Feb 11, 1:29 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 18, 11:09 AM CST | Tornado Watch | SPC | 6 hr |
| Feb 18, 1:33 PM CST | Mesoscale Discussion | SPC | 87 min |
| Feb 18, 2:25 PM CST | Severe Thunderstorm Warning | MRX | 65 min |
| Feb 18, 3:22 PM CST | Mesoscale Discussion | SPC | 83 min |
| Feb 28, 2:07 PM CST | Winter Weather Advisory | MRX | 28 hr |
| Mar 20, 1:43 PM CDT | Freeze Warning | MRX | 18 hr |
| Mar 26, 6:51 AM CDT | Areal Flood Advisory | MRX | 3 hr |
| Mar 28, 7:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Mar 28, 7:29 PM CDT | Tornado Watch | SPC | 4 hr |
| Mar 28, 8:09 PM CDT | Severe Thunderstorm Warning | MRX | 66 min |
| Mar 28, 9:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 2, 4:02 AM CDT | Wind Advisory | MRX | 35 hr |
| Apr 2, 5:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 2, 6:02 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 2, 9:03 PM CDT | Severe Thunderstorm Warning | MRX | 42 min |
| Apr 2, 9:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Apr 2, 9:42 PM CDT | Severe Thunderstorm Warning | MRX | 18 min |
| Apr 5, 7:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 6, 2:27 PM CDT | Freeze Watch | MRX | 12 hr |
| Apr 6, 2:27 PM CDT | Freeze Warning | MRX | 12 hr |
| Apr 7, 2:54 AM CDT | Freeze Warning | MRX | 30 hr |
| Apr 10, 5:03 AM CDT | Severe Thunderstorm Warning | MRX | 42 min |
| Apr 10, 11:23 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 10, 2:28 PM CDT | Tornado Warning | MRX | 47 min |
| Apr 10, 2:54 PM CDT | Severe Thunderstorm Warning | MRX | 51 min |
| Apr 10, 3:12 PM CDT | Tornado Warning | MRX | 48 min |
| Apr 12, 7:40 PM CDT | Wind Advisory | MRX | 18 hr |
| Apr 13, 5:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 13, 9:51 PM CDT | Severe Thunderstorm Warning | MRX | 54 min |
| Apr 13, 10:26 PM CDT | Severe Thunderstorm Warning | MRX | 39 min |
| Apr 21, 1:17 PM CDT | Wind Advisory | MRX | 6 hr |
| Apr 23, 2:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 1, 1:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 1, 2:23 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 1, 6:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 2, 8:32 AM CDT | Areal Flood Advisory | MRX | 118 min |
| May 2, 1:54 PM CDT | Flood Watch | MRX | 44 hr |
| May 3, 5:27 AM CDT | River Flood Warning | MRX | 27 hr |
| May 3, 7:10 PM CDT | Severe Thunderstorm Warning | MRX | 41 min |
| May 3, 7:22 PM CDT | Areal Flood Advisory | MRX | 113 min |
| May 5, 2:29 PM CDT | Flood Watch | MRX | 31 hr |
| May 6, 10:50 AM CDT | Areal Flood Advisory | MRX | 115 min |
| May 8, 8:37 AM CDT | Mesoscale Discussion | SPC | 53 min |
| May 15, 12:50 PM CDT | Areal Flood Advisory | MRX | 3 hr |
| May 15, 12:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| May 15, 5:02 PM CDT | Severe Thunderstorm Warning | MRX | 58 min |
| May 16, 1:45 AM CDT | Flash Flood Watch | MRX | 19 hr |
| May 18, 8:22 PM CDT | Frost Advisory | MRX | 12 hr |
| May 28, 12:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 28, 1:21 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 28, 6:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 1, 4:21 PM CDT | Severe Thunderstorm Warning | MRX | 39 min |
| Jun 11, 8:40 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 11, 11:18 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 11, 11:27 AM CDT | Severe Thunderstorm Warning | MRX | 48 min |
| Jun 16, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 3:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 17, 10:29 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 17, 11:54 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 17, 2:17 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 3:07 PM CDT | Mesoscale Discussion | SPC | 23 min |
| Jun 18, 9:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 18, 9:39 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 12:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 18, 3:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 22, 10:19 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 22, 11:34 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 2:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 27, 1:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 27, 3:03 PM CDT | Severe Thunderstorm Warning | MRX | 57 min |
| Jun 28, 11:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 28, 12:34 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 2:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 28, 3:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 30, 11:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 4, 8:02 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jul 5, 8:14 PM CDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 30, 2:14 PM CDT | Flood Watch | MRX | 24 hr |
| Jul 30, 8:15 PM CDT | Severe Thunderstorm Warning | MRX | 60 min |
| Jul 31, 5:22 AM CDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 1, 2:04 PM CDT | Flood Watch | MRX | 12 hr |
| Aug 4, 5:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 4, 8:49 PM CDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 8, 5:17 PM CDT | Severe Thunderstorm Warning | MRX | 33 min |
| Sep 9, 11:39 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Sep 9, 11:39 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Sep 20, 1:28 PM CDT | Flood Watch | MRX | 37 hr |
| Sep 21, 8:03 AM CDT | Areal Flood Warning | MRX | 12 hr |
| Sep 25, 4:24 AM CDT | Flash Flood Watch | MRX | 40 hr |
| Sep 26, 9:52 AM CDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 26, 10:25 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 26, 11:23 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 26, 11:25 AM CDT | Areal Flood Warning | MRX | 6 hr |
| Oct 8, 2:19 PM CDT | Wind Advisory | MRX | 30 hr |
| Oct 9, 2:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Oct 9, 3:27 PM CDT | Tornado Watch | SPC | 6 hr |
| Oct 9, 5:06 PM CDT | Severe Thunderstorm Warning | MRX | 54 min |
| Oct 9, 5:43 PM CDT | Severe Thunderstorm Warning | MRX | 62 min |
| Oct 9, 5:48 PM CDT | Tornado Warning | MRX | 57 min |
| Oct 9, 8:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Oct 17, 2:16 PM CDT | Frost Advisory | MRX | 19 hr |
| Oct 17, 7:59 PM CDT | Freeze Watch | MRX | 13 hr |
| Oct 18, 9:00 AM CDT | Freeze Warning | MRX | 23 hr |
| Oct 19, 1:50 PM CDT | Freeze Warning | MRX | 18 hr |
| Oct 24, 1:12 PM CDT | Frost Advisory | MRX | 19 hr |
| Nov 1, 1:45 PM CST | Frost Advisory | MRX | 18 hr |
| Nov 3, 1:45 PM CST | Frost Advisory | MRX | 19 hr |
| Nov 5, 2:15 AM CST | Frost Advisory | MRX | 30 hr |
| Nov 6, 1:51 PM CST | Frost Advisory | MRX | 17 hr |
| Nov 10, 3:39 AM CST | Flash Flood Watch | MRX | 32 hr |
| Dec 1, 4:26 PM CST | Wind Advisory | MRX | 31 hr |
| Dec 4, 11:18 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 8, 2:57 AM CST | Wind Advisory | MRX | 39 hr |
| Dec 8, 5:34 PM CST | Severe Thunderstorm Warning | MRX | 13 min |
| Dec 8, 11:07 PM CST | Areal Flood Advisory | MRX | 3 hr |
| Dec 9, 7:34 AM CST | Areal Flood Warning | MRX | 3 hr |
| Dec 13, 8:07 PM CST | Dense Fog Advisory | MRX | 13 hr |
| Dec 17, 2:18 PM CST | Winter Weather Advisory | MRX | 37 hr |
| Dec 23, 2:39 PM CST | Wind Advisory | MRX | 48 hr |
| Dec 24, 10:25 PM CST | Areal Flood Advisory | MRX | 4 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 | 19 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 40 |
| Flooding | |
| Areal Flood Warning | 5 |
| River Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 6 |
| Areal Flood Advisory | 11 |
| Winter | |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 3 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 7 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.