Alert archive / Tennessee / DeKalb County
Weather alerts in DeKalb County, Tennessee, 2017
141 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
DeKalb County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 141
- Warnings
- 32
- Watches
- 17
- Advisories
- 36
- Busiest month
- March32 alerts
- Busiest day
- April 5, 20179 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 2 tornado warnings covering DeKalb County in 2017 had a tornado report inside them.
DeKalb County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 0 | ||
| Severe thunderstorm warnings | 20 | 13 | 35% | 6 | 67% | 20 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 31 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Nashville, TN: tornado warnings | 47 | 8 | 83% | 25 | 40% | 16 min |
| NWS Nashville, TN: severe thunderstorm warnings | 211 | 135 | 36% | 558 | 76% | 16 min |
| NWS Nashville, TN: flash flood warnings | 35 | 28 | 20% | 110 | 65% | 118 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 1, 7:26 PM CST | Dense Fog Advisory | OHX | 14 hr |
| Jan 4, 2:32 PM CST | Winter Weather Advisory | OHX | 33 hr |
| Jan 6, 2:31 AM CST | Winter Weather Advisory | OHX | 13 hr |
| Jan 6, 3:08 PM CST | Winter Weather Advisory | OHX | 7 hr |
| Jan 7, 3:18 AM CST | Wind Chill Advisory | OHX | 6 hr |
| Jan 9, 6:48 PM CST | Wind Advisory | OHX | 23 hr |
| Jan 13, 10:21 PM CST | Dense Fog Advisory | OHX | 11 hr |
| Jan 15, 10:41 PM CST | Dense Fog Advisory | OHX | 10 hr |
| Jan 22, 10:13 PM CST | Wind Advisory | OHX | 14 hr |
| Jan 22, 10:42 PM CST | Areal Flood Advisory | OHX | 3 hr |
| Feb 7, 7:28 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 8, 3:02 PM CST | Mesoscale Discussion | SPC | 118 min |
| Feb 8, 4:53 PM CST | Severe Thunderstorm Watch | SPC | 6 hr |
| Feb 8, 5:50 PM CST | Special Weather Statement | OHX | 25 min |
| Feb 8, 6:06 PM CST | Special Weather Statement | OHX | 54 min |
| Feb 8, 7:04 PM CST | Mesoscale Discussion | SPC | 86 min |
| Feb 8, 8:55 PM CST | Mesoscale Discussion | SPC | 65 min |
| Feb 24, 5:28 PM CST | Mesoscale Discussion | SPC | 62 min |
| Feb 24, 8:50 PM CST | Mesoscale Discussion | SPC | 85 min |
| Feb 24, 9:10 PM CST | Special Weather Statement | OHX | 50 min |
| Mar 1, 4:19 AM CST | Mesoscale Discussion | SPC | 56 min |
| Mar 1, 4:57 AM CST | Tornado Watch | SPC | 5 hr |
| Mar 1, 5:28 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 1, 7:26 AM CST | Severe Thunderstorm Warning | OHX | 34 min |
| Mar 1, 7:28 AM CST | Mesoscale Discussion | SPC | 92 min |
| Mar 1, 7:52 AM CST | Tornado Warning | OHX | 23 min |
| Mar 1, 7:58 AM CST | Severe Thunderstorm Warning | OHX | 32 min |
| Mar 1, 8:20 AM CST | Severe Thunderstorm Warning | OHX | 25 min |
| Mar 7, 12:37 AM CST | Wind Advisory | OHX | 10 hr |
| Mar 9, 8:38 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 9, 10:08 PM CST | Severe Thunderstorm Warning | OHX | 37 min |
| Mar 9, 10:11 PM CST | Severe Thunderstorm Warning | OHX | 34 min |
| Mar 9, 10:42 PM CST | Mesoscale Discussion | SPC | 63 min |
| Mar 9, 11:33 PM CST | Severe Thunderstorm Warning | OHX | 27 min |
| Mar 10, 12:03 AM CST | Special Weather Statement | OHX | 42 min |
| Mar 10, 11:27 AM CST | Freeze Warning | OHX | 21 hr |
| Mar 11, 3:36 AM CST | Winter Weather Advisory | OHX | 21 hr |
| Mar 11, 3:44 AM CST | Freeze Warning | OHX | 26 hr |
| Mar 11, 7:33 AM CST | Winter Weather Advisory | OHX | 4 hr |
| Mar 12, 2:40 PM CDT | Freeze Warning | OHX | 16 hr |
| Mar 13, 3:06 PM CDT | Freeze Warning | OHX | 43 hr |
| Mar 15, 2:23 AM CDT | Freeze Warning | OHX | 32 hr |
| Mar 20, 7:41 PM CDT | Special Weather Statement | OHX | 49 min |
| Mar 21, 2:33 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 21, 4:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 21, 5:00 PM CDT | Severe Thunderstorm Warning | OHX | 30 min |
| Mar 21, 5:29 PM CDT | Severe Thunderstorm Warning | OHX | 46 min |
| Mar 27, 11:26 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 27, 1:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 27, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 27, 4:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Mar 27, 5:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 3, 9:15 AM CDT | Wind Advisory | OHX | 6 hr |
| Apr 5, 1:02 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 5, 1:50 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 5, 3:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 5, 4:02 PM CDT | Wind Advisory | OHX | 29 hr |
| Apr 5, 5:22 PM CDT | Severe Thunderstorm Warning | OHX | 23 min |
| Apr 5, 5:38 PM CDT | Special Weather Statement | OHX | 37 min |
| Apr 5, 5:46 PM CDT | Special Weather Statement | OHX | 44 min |
| Apr 5, 6:12 PM CDT | Severe Thunderstorm Warning | OHX | 33 min |
| Apr 5, 6:57 PM CDT | Mesoscale Discussion | SPC | 48 min |
| Apr 7, 3:30 AM CDT | Freeze Warning | OHX | 29 hr |
| Apr 17, 1:56 PM CDT | Special Weather Statement | OHX | 34 min |
| Apr 17, 2:21 PM CDT | Special Weather Statement | OHX | 24 min |
| Apr 21, 1:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 21, 8:20 PM CDT | Flash Flood Watch | OHX | 31 hr |
| Apr 22, 6:02 PM CDT | Areal Flood Advisory | OHX | 118 min |
| Apr 24, 6:49 PM CDT | Dense Fog Advisory | OHX | 14 hr |
| Apr 28, 2:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Apr 29, 7:35 PM CDT | Special Weather Statement | OHX | 25 min |
| Apr 29, 7:56 PM CDT | Special Weather Statement | OHX | 49 min |
| Apr 30, 2:12 AM CDT | Wind Advisory | OHX | 19 hr |
| Apr 30, 1:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 30, 1:36 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 30, 3:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 30, 3:56 PM CDT | Special Weather Statement | OHX | 49 min |
| Apr 30, 4:28 PM CDT | Special Weather Statement | OHX | 62 min |
| Apr 30, 9:05 PM CDT | Wind Advisory | OHX | 22 hr |
| May 12, 12:57 AM CDT | Areal Flood Advisory | OHX | 2 hr |
| May 20, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 20, 7:41 PM CDT | Special Weather Statement | OHX | 34 min |
| May 24, 11:47 AM CDT | Mesoscale Discussion | SPC | 58 min |
| May 27, 9:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| May 27, 3:53 PM CDT | Severe Thunderstorm Warning | OHX | 37 min |
| May 27, 4:28 PM CDT | Severe Thunderstorm Warning | OHX | 32 min |
| May 27, 5:13 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 27, 7:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| May 27, 7:43 PM CDT | Severe Thunderstorm Warning | OHX | 32 min |
| May 27, 7:47 PM CDT | Severe Thunderstorm Warning | OHX | 28 min |
| May 27, 8:09 PM CDT | Severe Thunderstorm Warning | OHX | 66 min |
| May 30, 1:45 PM CDT | Special Weather Statement | OHX | 30 min |
| May 30, 4:17 PM CDT | Special Weather Statement | OHX | 43 min |
| Jun 6, 2:50 AM CDT | Dense Fog Advisory | OHX | 6 hr |
| Jun 15, 11:36 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 11:47 AM CDT | Special Weather Statement | OHX | 43 min |
| Jun 16, 1:58 AM CDT | Dense Fog Advisory | OHX | 6 hr |
| Jun 18, 2:19 PM CDT | Flash Flood Watch | OHX | 13 hr |
| Jun 23, 10:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 23, 12:16 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 23, 3:15 PM CDT | Special Weather Statement | OHX | 30 min |
| Jun 23, 3:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 1, 12:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 5, 10:54 AM CDT | Special Weather Statement | OHX | 51 min |
| Jul 6, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 14, 12:56 PM CDT | Special Weather Statement | OHX | 34 min |
| Jul 15, 5:40 AM CDT | Areal Flood Advisory | OHX | 2 hr |
| Jul 15, 6:39 AM CDT | Flash Flood Warning | OHX | 3 hr |
| Jul 15, 10:06 AM CDT | Flash Flood Watch | OHX | 5 hr |
| Jul 16, 4:10 AM CDT | Dense Fog Advisory | OHX | 5 hr |
| Jul 23, 6:47 PM CDT | Severe Thunderstorm Warning | OHX | 43 min |
| Jul 23, 7:28 PM CDT | Special Weather Statement | OHX | 62 min |
| Aug 2, 5:09 PM CDT | Areal Flood Advisory | OHX | 3 hr |
| Aug 4, 3:51 PM CDT | Severe Thunderstorm Warning | OHX | 24 min |
| Aug 4, 4:27 PM CDT | Special Weather Statement | OHX | 48 min |
| Aug 22, 8:00 PM CDT | Severe Thunderstorm Warning | OHX | 30 min |
| Aug 22, 8:28 PM CDT | Special Weather Statement | OHX | 47 min |
| Aug 30, 2:46 PM CDT | Flash Flood Watch | OHX | 46 hr |
| Aug 31, 11:42 PM CDT | Wind Advisory | OHX | 16 hr |
| Sep 10, 3:04 PM CDT | Wind Advisory | OHX | 40 hr |
| Sep 15, 2:27 AM CDT | Dense Fog Advisory | OHX | 7 hr |
| Oct 13, 5:15 AM CDT | Dense Fog Advisory | OHX | 4 hr |
| Oct 24, 2:37 PM CDT | Frost Advisory | OHX | 18 hr |
| Oct 25, 2:48 AM CDT | Frost Advisory | OHX | 29 hr |
| Oct 28, 2:53 PM CDT | Freeze Watch | OHX | 13 hr |
| Oct 29, 3:38 AM CDT | Freeze Warning | OHX | 29 hr |
| Nov 4, 12:45 AM CDT | Dense Fog Advisory | OHX | 8 hr |
| Nov 7, 12:54 AM CST | Areal Flood Advisory | OHX | 3 hr |
| Nov 7, 1:43 AM CST | Special Weather Statement | OHX | 47 min |
| Nov 7, 5:25 AM CST | Areal Flood Warning | OHX | 6 hr |
| Nov 7, 5:44 AM CST | Flash Flood Warning | OHX | 3 hr |
| Nov 7, 11:24 AM CST | Areal Flood Advisory | OHX | 3 hr |
| Nov 17, 2:50 PM CST | Wind Advisory | OHX | 33 hr |
| Nov 18, 12:35 PM CST | Severe Thunderstorm Watch | SPC | 6 hr |
| Nov 18, 3:18 PM CST | Mesoscale Discussion | SPC | 117 min |
| Nov 18, 5:09 PM CST | Severe Thunderstorm Warning | OHX | 36 min |
| Nov 18, 5:24 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 18, 5:41 PM CST | Tornado Warning | OHX | 10 min |
| Nov 18, 5:44 PM CST | Severe Thunderstorm Warning | OHX | 46 min |
| Dec 18, 11:54 PM CST | Dense Fog Advisory | OHX | 9 hr |
| Dec 21, 1:46 PM CST | Flash Flood Watch | OHX | 43 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 | 20 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 32 |
| Special Weather Statement | 24 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Weather Advisory | 5 |
| Cold | |
| Freeze Warning | 7 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.