Alert archive / Tennessee / Henry County
Weather alerts in Henry County, Tennessee, 2009
153 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Henry County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 153
- Warnings
- 29
- Watches
- 34
- Advisories
- 46
- Busiest month
- April24 alerts
- Busiest day
- April 10, 20099 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Henry County in 2009 had a tornado report inside them.
Henry County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 14 | 8 | 43% | 6 | 83% | 14 min |
| Flash flood warnings | 7 | 3 | 57% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Memphis, TN: tornado warnings | 69 | 19 | 72% | 51 | 65% | 19 min |
| NWS Memphis, TN: severe thunderstorm warnings | 439 | 207 | 53% | 423 | 82% | 24 min |
| NWS Memphis, TN: flash flood warnings | 235 | 126 | 46% | 204 | 92% | 94 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, 8:50 AM CST | Winter Weather Advisory | MEG | 7 hr |
| Jan 5, 3:30 PM CST | Winter Weather Advisory | MEG | 20 hr |
| Jan 14, 4:30 AM CST | Wind Chill Advisory | MEG | 30 hr |
| Jan 15, 4:48 AM CST | Wind Chill Advisory | MEG | 28 hr |
| Jan 26, 4:19 AM CST | Ice Storm Warning | MEG | 48 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, 6:25 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 27, 11:31 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 4:32 AM CST | Winter Weather Advisory | MEG | 5 hr |
| Jan 31, 6:11 AM CST | Freezing Fog Advisory | MEG | 5 hr |
| Feb 3, 3:37 PM CST | Wind Chill Advisory | MEG | 18 hr |
| Feb 10, 3:31 AM CST | Wind Advisory | MEG | 39 hr |
| Feb 10, 3:25 PM CST | High Wind Warning | MEG | 24 hr |
| Feb 10, 3:25 PM CST | Wind Advisory | MEG | 28 hr |
| Feb 27, 9:33 PM CST | Winter Storm Watch | MEG | 6 hr |
| Feb 28, 3:59 AM CST | Winter Storm Warning | MEG | 28 hr |
| Mar 8, 3:41 AM CDT | Wind Advisory | MEG | 15 hr |
| Mar 10, 7:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Mar 11, 3:53 AM CDT | Winter Weather Advisory | MEG | 42 hr |
| Mar 15, 3:56 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| Mar 16, 9:39 PM CDT | Dense Fog Advisory | MEG | 12 hr |
| Mar 17, 11:27 PM CDT | Dense Fog Advisory | MEG | 10 hr |
| Mar 23, 3:37 PM CDT | Wind Advisory | MEG | 28 hr |
| Mar 28, 4:08 AM CDT | Wind Advisory | MEG | 16 hr |
| Mar 28, 12:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Mar 29, 4:41 AM CDT | Frost Advisory | MEG | 28 hr |
| Apr 2, 3:05 PM CDT | Wind Advisory | MEG | 10 hr |
| Apr 2, 6:21 PM CDT | Tornado Watch | SPC | 3 hr |
| Apr 5, 4:05 AM CDT | Freeze Watch | MEG | 24 hr |
| Apr 5, 4:05 AM CDT | Wind Advisory | MEG | 24 hr |
| Apr 5, 10:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 5, 11:44 AM CDT | Tornado Watch | SPC | 6 hr |
| Apr 5, 2:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 6, 3:52 AM CDT | Freeze Warning | MEG | 27 hr |
| Apr 7, 3:58 AM CDT | Freeze Warning | MEG | 27 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, 8:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 10, 8:53 AM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 9:51 AM CDT | Severe Thunderstorm Warning | MEG | 39 min |
| Apr 10, 9:56 AM CDT | Tornado Warning | MEG | 49 min |
| Apr 10, 10:34 AM CDT | Severe Thunderstorm Warning | MEG | 13 min |
| Apr 10, 11:14 AM CDT | Mesoscale Discussion | SPC | 76 min |
| Apr 10, 1:13 PM CDT | Wind Advisory | MEG | 6 hr |
| Apr 19, 1:17 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 19, 2:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 19, 3:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 19, 5:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Apr 30, 3:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 30, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 30, 8:09 PM CDT | Areal Flood Advisory | MEG | 3 hr |
| May 1, 12:26 PM CDT | Flash Flood Warning | MEG | 2 hr |
| May 1, 2:24 PM CDT | Flash Flood Warning | MEG | 3 hr |
| May 1, 3:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| May 1, 3:36 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 1, 3:40 PM CDT | Flash Flood Watch | MEG | 55 hr |
| May 1, 5:23 PM CDT | Flash Flood Warning | MEG | 3 hr |
| May 2, 1:42 AM CDT | Areal Flood Advisory | MEG | 3 hr |
| May 5, 4:13 AM CDT | Flash Flood Watch | MEG | 35 hr |
| May 7, 5:18 AM CDT | Dense Fog Advisory | MEG | 4 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, 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, 8:29 PM CDT | Flash Flood Watch | MEG | 47 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, 1:55 AM CDT | Severe Thunderstorm Warning | MEG | 50 min |
| May 9, 2:22 AM CDT | Mesoscale Discussion | SPC | 53 min |
| May 14, 3:56 AM CDT | Mesoscale Discussion | SPC | 64 min |
| May 15, 4:03 PM CDT | Flash Flood Watch | MEG | 27 hr |
| May 27, 1:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 10, 5:20 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 11, 2:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 11, 6:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 11, 7:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 15, 9:59 AM CDT | Mesoscale Discussion | SPC | 31 min |
| Jun 15, 10:34 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 1:04 PM CDT | Severe Thunderstorm Warning | MEG | 41 min |
| Jun 15, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 15, 2:48 PM CDT | Tornado Watch | SPC | 3 hr |
| Jun 15, 3:52 PM CDT | Mesoscale Discussion | SPC | 53 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, 12:29 PM CDT | Severe Thunderstorm Warning | MEG | 46 min |
| Jun 16, 1:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Jun 17, 3:12 PM CDT | Heat Advisory | MEG | 5 days |
| Jun 23, 3:26 AM CDT | Heat Advisory | MEG | 16 hr |
| Jun 26, 3:17 AM CDT | Heat Advisory | MEG | 61 hr |
| Jun 26, 2:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 30, 8:07 PM CDT | Severe Thunderstorm Warning | MEG | 23 min |
| Jun 30, 9:10 PM CDT | Severe Thunderstorm Warning | MEG | 50 min |
| Jul 4, 2:10 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 4, 5:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 4, 8:02 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jul 4, 10:39 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jul 12, 8:41 PM CDT | Areal Flood Advisory | MEG | 78 min |
| Jul 15, 1:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 15, 6:03 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 15, 7:00 PM CDT | Severe Thunderstorm Warning | MEG | 45 min |
| Jul 15, 7:40 PM CDT | Severe Thunderstorm Warning | MEG | 51 min |
| Jul 15, 7:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 21, 10:06 AM CDT | Flash Flood Watch | MEG | 17 hr |
| Jul 23, 3:17 AM CDT | Dense Fog Advisory | MEG | 6 hr |
| Jul 28, 6:56 AM CDT | Areal Flood Advisory | MEG | 2 hr |
| Jul 29, 3:13 PM CDT | Flash Flood Watch | MEG | 37 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, 6:28 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Jul 30, 6:29 PM CDT | Mesoscale Discussion | SPC | 61 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, 7:03 PM CDT | Severe Thunderstorm Warning | MEG | 42 min |
| Aug 4, 7:06 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Aug 4, 7:34 PM CDT | Severe Thunderstorm Warning | MEG | 41 min |
| Aug 4, 7:38 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Aug 4, 7:43 PM CDT | Severe Thunderstorm Warning | MEG | 47 min |
| Aug 4, 8:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 4, 9:36 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 9:38 PM CDT | Severe Thunderstorm Warning | MEG | 67 min |
| Aug 4, 10:10 PM CDT | Flash Flood Warning | MEG | 3 hr |
| Aug 5, 11:40 PM CDT | Dense Fog Advisory | MEG | 9 hr |
| Aug 12, 3:32 AM CDT | Dense Fog Advisory | MEG | 4 hr |
| Sep 3, 6:02 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| Sep 6, 3:25 PM CDT | Areal Flood Advisory | MEG | 2 hr |
| Sep 15, 4:15 AM CDT | Flash Flood Watch | MEG | 4 days |
| Sep 20, 11:14 AM CDT | Flash Flood Watch | MEG | 8 hr |
| Sep 26, 3:30 PM CDT | Dense Fog Advisory | MEG | 16 hr |
| Oct 7, 3:50 PM CDT | Flash Flood Watch | MEG | 48 hr |
| Oct 8, 8:00 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 8, 11:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Oct 9, 2:38 AM CDT | Mesoscale Discussion | SPC | 52 min |
| Oct 15, 3:30 AM CDT | Dense Fog Advisory | MEG | 3 hr |
| Oct 16, 8:58 PM CDT | Freeze Watch | MEG | 19 hr |
| Oct 17, 3:40 PM CDT | Frost Advisory | MEG | 17 hr |
| Oct 18, 3:56 AM CDT | Frost Advisory | MEG | 29 hr |
| Oct 18, 3:33 PM CDT | Freeze Warning | MEG | 17 hr |
| Oct 24, 3:58 AM CDT | Frost Advisory | MEG | 17 hr |
| Oct 28, 3:48 AM CDT | Flash Flood Watch | MEG | 63 hr |
| Oct 30, 12:01 PM CDT | Severe Thunderstorm Warning | MEG | 29 min |
| Nov 1, 3:25 AM CST | Frost Advisory | MEG | 29 hr |
| Nov 2, 3:23 AM CST | Freeze Watch | MEG | 36 hr |
| Nov 3, 3:43 PM CST | Frost Advisory | MEG | 16 hr |
| Nov 5, 3:26 PM CST | Freeze Warning | MEG | 16 hr |
| Dec 8, 3:31 PM CST | Flash Flood Watch | MEG | 8 hr |
| Dec 9, 5:53 AM CST | Wind Advisory | MEG | 6 hr |
| Dec 21, 9:05 PM CST | Freezing Fog Advisory | MEG | 11 hr |
| Dec 22, 8:19 AM CST | Freezing Fog Advisory | MEG | 41 min |
| Dec 23, 3:32 PM CST | High Wind Watch | MEG | 24 hr |
| Dec 23, 3:32 PM CST | Wind Advisory | MEG | 44 hr |
| Dec 24, 6:53 PM CST | Areal Flood Advisory | MEG | 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 | 14 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 8 |
| Mesoscale Discussion | 44 |
| Flooding | |
| Flash Flood Warning | 7 |
| Flash Flood Watch | 11 |
| Areal Flood Advisory | 7 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 3 |
| Frost Advisory | 6 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
| Freezing Fog Advisory | 3 |
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.