Alert archive / Tennessee / Montgomery County
Weather alerts in Montgomery County, Tennessee, 2009
165 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Montgomery County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 165
- Warnings
- 59
- Watches
- 35
- Advisories
- 28
- Busiest month
- June29 alerts
- Busiest day
- March 28, 200910 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 12 tornado warnings covering Montgomery County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 10 minutes after it went out.
Montgomery County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 12 | 1 | 92% | 1 | 100% | 10 min |
| Severe thunderstorm warnings | 34 | 15 | 56% | 8 | 50% | 21 min |
| Flash flood warnings | 2 | 1 | 50% | 2 | 50% | 75 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Nashville, TN: tornado warnings | 106 | 18 | 83% | 34 | 85% | 15 min |
| NWS Nashville, TN: severe thunderstorm warnings | 329 | 84 | 74% | 227 | 59% | 20 min |
| NWS Nashville, TN: flash flood warnings | 78 | 23 | 71% | 44 | 70% | 85 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 5, 11:28 AM CST | Winter Weather Advisory | OHX | 16 hr |
| Jan 26, 4:00 AM CST | Ice Storm Warning | OHX | 32 hr |
| Jan 26, 11:44 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 27, 6:06 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 27, 8:40 AM CST | Areal Flood Advisory | OHX | 24 hr |
| Jan 27, 3:08 PM CST | Winter Weather Advisory | OHX | 20 hr |
| Jan 27, 11:31 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 9:57 AM CST | River Flood Warning | OHX | 34 hr |
| Feb 10, 3:58 PM CST | Wind Advisory | OHX | 28 hr |
| Feb 11, 10:46 AM CST | Severe Thunderstorm Warning | OHX | 29 min |
| Feb 18, 12:15 AM CST | Severe Thunderstorm Warning | OHX | 30 min |
| Feb 18, 9:53 AM CST | Mesoscale Discussion | SPC | 97 min |
| Feb 27, 3:36 AM CST | Severe Thunderstorm Warning | OHX | 24 min |
| Feb 28, 4:43 AM CST | Winter Weather Advisory | OHX | 25 hr |
| Mar 8, 6:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Mar 8, 7:01 PM CDT | Severe Thunderstorm Warning | OHX | 29 min |
| Mar 11, 3:34 AM CDT | Winter Storm Watch | OHX | 13 hr |
| Mar 11, 4:11 PM CDT | Winter Weather Advisory | OHX | 34 hr |
| Mar 17, 1:03 AM CDT | Dense Fog Advisory | OHX | 8 hr |
| Mar 28, 12:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Mar 28, 2:23 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 28, 4:20 PM CDT | Severe Thunderstorm Warning | OHX | 25 min |
| Mar 28, 4:35 PM CDT | Severe Thunderstorm Warning | OHX | 40 min |
| Mar 28, 4:44 PM CDT | Severe Thunderstorm Warning | OHX | 31 min |
| Mar 28, 4:47 PM CDT | Severe Thunderstorm Warning | OHX | 28 min |
| Mar 28, 4:55 PM CDT | Tornado Warning | OHX | 16 min |
| Mar 28, 4:59 PM CDT | Tornado Warning | OHX | 31 min |
| Mar 28, 5:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Mar 28, 5:26 PM CDT | Severe Thunderstorm Warning | OHX | 49 min |
| Apr 2, 2:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 2, 2:40 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 2, 3:12 PM CDT | Severe Thunderstorm Warning | OHX | 33 min |
| Apr 2, 6:02 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 5, 11:44 AM CDT | Tornado Watch | SPC | 6 hr |
| Apr 5, 5:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Apr 5, 5:37 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 5, 5:47 PM CDT | Severe Thunderstorm Warning | OHX | 28 min |
| Apr 5, 10:31 PM CDT | Freeze Watch | OHX | 5 hr |
| Apr 5, 10:31 PM CDT | Freeze Watch | OHX | 5 hr |
| Apr 6, 3:56 AM CDT | Freeze Warning | OHX | 29 hr |
| Apr 6, 3:56 AM CDT | Freeze Warning | OHX | 51 hr |
| Apr 10, 12:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 10, 1:22 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 10, 3:33 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 10, 8:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 10, 8:53 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 11:02 AM CDT | Tornado Warning | OHX | 43 min |
| Apr 10, 11:14 AM CDT | Mesoscale Discussion | SPC | 76 min |
| Apr 10, 11:27 AM CDT | Tornado Warning | OHX | 33 min |
| Apr 10, 11:36 AM CDT | Severe Thunderstorm Warning | OHX | 39 min |
| Apr 10, 11:57 AM CDT | Tornado Warning | OHX | 33 min |
| Apr 13, 12:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Apr 13, 12:58 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 1:28 PM CDT | Severe Thunderstorm Warning | OHX | 21 min |
| Apr 13, 1:53 PM CDT | Severe Thunderstorm Warning | OHX | 37 min |
| May 1, 4:27 PM CDT | Flash Flood Watch | OHX | 8 hr |
| May 1, 5:03 PM CDT | Flash Flood Warning | OHX | 5 hr |
| May 2, 3:17 AM CDT | Flood Watch | OHX | 48 hr |
| May 8, 4:10 AM CDT | Severe Thunderstorm Warning | OHX | 35 min |
| May 8, 4:29 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 8, 8:37 AM CDT | Mesoscale Discussion | SPC | 53 min |
| May 8, 9:21 AM CDT | Tornado Watch | SPC | 7 hr |
| May 8, 11:30 AM CDT | Flash Flood Watch | OHX | 37 hr |
| May 8, 1:05 PM CDT | Severe Thunderstorm Warning | OHX | 40 min |
| May 8, 1:16 PM CDT | Tornado Warning | OHX | 44 min |
| May 8, 1:43 PM CDT | Tornado Warning | OHX | 47 min |
| May 8, 2:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 8, 3:42 PM CDT | Tornado Watch | SPC | 7 hr |
| May 8, 7:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| May 8, 8:57 PM CDT | River Flood Advisory | OHX | 36 hr |
| May 8, 8:57 PM CDT | River Flood Advisory | OHX | 36 hr |
| May 8, 10:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 8, 10:31 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 9, 1:22 AM CDT | Severe Thunderstorm Warning | OHX | 38 min |
| May 9, 1:25 AM CDT | Flash Flood Warning | OHX | 3 hr |
| May 9, 2:22 AM CDT | Mesoscale Discussion | SPC | 53 min |
| May 9, 6:09 PM CDT | River Flood Warning | OHX | 18 hr |
| May 9, 9:14 PM CDT | River Flood Warning | OHX | 12 hr |
| May 10, 1:21 PM CDT | River Flood Advisory | OHX | 68 hr |
| May 10, 1:21 PM CDT | River Flood Advisory | OHX | 22 hr |
| May 12, 10:48 AM CDT | River Flood Advisory | OHX | 34 hr |
| May 18, 2:35 PM CDT | Frost Advisory | OHX | 18 hr |
| Jun 3, 2:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 11, 7:54 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 11, 8:40 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 11, 9:59 AM CDT | Tornado Warning | OHX | 31 min |
| Jun 11, 6:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 11, 7:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 11, 8:18 PM CDT | Tornado Watch | SPC | 4 hr |
| Jun 11, 8:49 PM CDT | Severe Thunderstorm Warning | OHX | 41 min |
| Jun 11, 10:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 14, 6:05 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 15, 10:34 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 16, 9:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 16, 10:40 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 16, 1:03 PM CDT | Severe Thunderstorm Warning | OHX | 42 min |
| Jun 16, 1:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Jun 16, 1:24 PM CDT | Severe Thunderstorm Warning | OHX | 51 min |
| Jun 17, 10:29 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 17, 3:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 17, 7:19 PM CDT | Tornado Warning | OHX | 26 min |
| Jun 17, 7:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 17, 7:46 PM CDT | Tornado Warning | OHX | 29 min |
| Jun 17, 8:09 PM CDT | Severe Thunderstorm Warning | OHX | 36 min |
| Jun 17, 8:17 PM CDT | Severe Thunderstorm Warning | OHX | 28 min |
| Jun 17, 8:46 PM CDT | Severe Thunderstorm Warning | OHX | 12 min |
| Jun 17, 11:13 PM CDT | Severe Thunderstorm Warning | OHX | 32 min |
| Jun 22, 6:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 26, 2:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 27, 4:04 AM CDT | Heat Advisory | OHX | 16 hr |
| Jul 4, 5:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 4, 5:56 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 4, 6:55 PM CDT | Tornado Warning | OHX | 35 min |
| Jul 4, 7:21 PM CDT | Tornado Warning | OHX | 39 min |
| Jul 4, 8:02 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jul 5, 1:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 12, 1:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 6:29 PM CDT | Severe Thunderstorm Warning | OHX | 46 min |
| Jul 15, 1:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 15, 2:34 PM CDT | Severe Thunderstorm Warning | OHX | 43 min |
| Jul 15, 2:35 PM CDT | Severe Thunderstorm Warning | OHX | 41 min |
| Jul 15, 3:34 PM CDT | Severe Thunderstorm Warning | OHX | 41 min |
| Jul 15, 7:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 30, 2:48 PM CDT | Flood Watch | OHX | 13 hr |
| Jul 30, 4:10 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 30, 5:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 30, 10:25 PM CDT | Areal Flood Advisory | OHX | 3 hr |
| Aug 1, 2:35 PM CDT | Flash Flood Watch | OHX | 13 hr |
| Aug 4, 2:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 4, 6:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 4, 6:34 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 4, 7:09 PM CDT | Severe Thunderstorm Warning | OHX | 51 min |
| Aug 4, 7:38 PM CDT | Severe Thunderstorm Warning | OHX | 52 min |
| Aug 4, 8:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 4, 9:51 PM CDT | Areal Flood Advisory | OHX | 4 hr |
| Aug 12, 3:47 AM CDT | Dense Fog Advisory | OHX | 3 hr |
| Sep 6, 3:04 PM CDT | Severe Thunderstorm Warning | OHX | 56 min |
| Sep 6, 3:37 PM CDT | Severe Thunderstorm Warning | OHX | 53 min |
| Sep 8, 12:56 PM CDT | Severe Thunderstorm Warning | OHX | 34 min |
| Sep 8, 1:02 PM CDT | Severe Thunderstorm Warning | OHX | 28 min |
| Sep 16, 10:22 AM CDT | Areal Flood Advisory | OHX | 6 hr |
| Sep 16, 3:36 PM CDT | Flood Watch | OHX | 51 hr |
| Sep 19, 2:39 AM CDT | Flood Watch | OHX | 45 hr |
| Sep 23, 3:20 AM CDT | Flash Flood Watch | OHX | 16 hr |
| Oct 9, 2:38 AM CDT | Mesoscale Discussion | SPC | 52 min |
| Oct 17, 3:59 AM CDT | Frost Advisory | OHX | 28 hr |
| Oct 17, 3:59 AM CDT | Freeze Watch | OHX | 24 hr |
| Oct 18, 3:33 AM CDT | Freeze Warning | OHX | 29 hr |
| Oct 24, 11:01 AM CDT | Frost Advisory | OHX | 21 hr |
| Oct 29, 4:05 AM CDT | Dense Fog Advisory | OHX | 4 hr |
| Nov 1, 3:04 AM CST | Frost Advisory | OHX | 28 hr |
| Nov 2, 3:40 AM CST | Freeze Watch | OHX | 31 hr |
| Nov 3, 10:43 AM CST | Freeze Warning | OHX | 19 hr |
| Nov 4, 3:32 PM CST | Freeze Watch | OHX | 24 hr |
| Nov 5, 3:16 PM CST | Freeze Warning | OHX | 16 hr |
| Nov 7, 12:30 PM CST | Red Flag Warning | OHX | 6 hr |
| Nov 19, 2:56 PM CST | Frost Advisory | OHX | 16 hr |
| Nov 25, 3:39 PM CST | Freeze Watch | OHX | 23 hr |
| Nov 26, 3:06 PM CST | Freeze Warning | OHX | 17 hr |
| Dec 8, 11:47 AM CST | Areal Flood Advisory | OHX | 12 hr |
| Dec 8, 11:47 AM CST | Wind Advisory | OHX | 26 hr |
| Dec 9, 8:06 AM CST | River Flood Advisory | OHX | 25 hr |
| Dec 21, 10:39 PM CST | Freezing Fog Advisory | OHX | 10 hr |
| Dec 23, 4:28 AM CST | Wind Advisory | OHX | 47 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 | 34 |
| Tornado Warning | 12 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 11 |
| Mesoscale Discussion | 43 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 3 |
| Flash Flood Watch | 4 |
| Flood Watch | 4 |
| Areal Flood Advisory | 5 |
| River Flood Advisory | 6 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 6 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
| Freezing Fog Advisory | 1 |
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.