Alert archive / Missouri / Knox County
Weather alerts in Knox County, Missouri, 2013
77 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Knox County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 77
- Warnings
- 17
- Watches
- 20
- Advisories
- 12
- Busiest month
- May18 alerts
- Busiest day
- May 28, 20136 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Knox County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 0 | 100% | 2 | 0% | |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 43 | 13 | 70% | 40 | 88% | 18 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 157 | 76 | 52% | 318 | 72% | 21 min |
| NWS St. Louis, MO: flash flood warnings | 48 | 18 | 63% | 64 | 84% | 111 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 12, 4:14 AM CST | Winter Weather Advisory | LSX | 24 hr |
| Jan 26, 4:12 AM CST | Freezing Rain Advisory | LSX | 32 hr |
| Jan 27, 2:36 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 29, 4:08 PM CST | Winter Weather Advisory | LSX | 23 hr |
| Feb 19, 3:47 AM CST | Winter Storm Watch | LSX | 25 hr |
| Feb 20, 4:42 AM CST | Winter Storm Warning | LSX | 47 hr |
| Feb 21, 6:16 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 21, 11:19 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 23, 3:53 PM CST | Winter Storm Watch | LSX | 36 hr |
| Feb 25, 3:42 AM CST | Winter Storm Warning | LSX | 33 hr |
| Feb 26, 2:22 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 26, 12:19 PM CST | Winter Weather Advisory | LSX | 30 hr |
| Mar 9, 3:53 PM CST | Flood Watch | LSX | 23 hr |
| Mar 11, 1:41 AM CDT | Areal Flood Warning | LSX | 12 hr |
| Mar 22, 4:11 AM CDT | Winter Storm Watch | LSX | 34 hr |
| Mar 23, 4:17 AM CDT | Winter Storm Warning | LSX | 44 hr |
| Apr 14, 3:28 AM CDT | Wind Advisory | LSX | 16 hr |
| Apr 16, 4:30 PM CDT | Flash Flood Watch | LSX | 50 hr |
| Apr 17, 8:49 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 17, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Apr 17, 11:11 AM CDT | Tornado Watch | SPC | 11 hr |
| Apr 17, 1:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 17, 7:39 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Apr 17, 7:46 PM CDT | Flash Flood Warning | LSX | 8 hr |
| Apr 17, 9:40 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Apr 18, 3:32 AM CDT | Flash Flood Warning | LSX | 12 hr |
| Apr 18, 3:34 PM CDT | Areal Flood Warning | LSX | 24 hr |
| Apr 19, 4:27 AM CDT | Freeze Warning | LSX | 28 hr |
| May 19, 11:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 19, 5:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| May 19, 6:25 PM CDT | Tornado Watch | SPC | 9 hr |
| May 19, 10:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 20, 5:24 PM CDT | Tornado Watch | SPC | 7 hr |
| May 20, 5:55 PM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| May 26, 6:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 27, 3:54 PM CDT | Flash Flood Watch | LSX | 18 hr |
| May 28, 2:48 AM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| May 28, 3:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 28, 1:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 28, 2:23 PM CDT | Tornado Watch | SPC | 8 hr |
| May 28, 2:51 PM CDT | Flash Flood Watch | LSX | 13 hr |
| May 28, 5:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| May 28, 9:20 PM CDT | Mesoscale Discussion | SPC | 55 min |
| May 30, 4:03 AM CDT | Flash Flood Watch | LSX | 51 hr |
| May 30, 12:32 PM CDT | Tornado Watch | SPC | 7 hr |
| May 30, 2:38 PM CDT | Severe Thunderstorm Warning | LSX | 22 min |
| Jun 15, 1:50 AM CDT | Special Weather Statement | EAX | 10 min |
| Jun 15, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 7:27 PM CDT | Flash Flood Watch | LSX | 9 hr |
| Jun 24, 10:35 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 24, 12:14 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 2:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 9:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 26, 1:43 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 26, 2:09 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 26, 3:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 22, 3:33 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Jul 22, 11:27 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Aug 6, 5:44 AM CDT | Dense Fog Advisory | LSX | 3 hr |
| Aug 6, 9:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 7, 2:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 5:32 AM CDT | Mesoscale Discussion | SPC | 103 min |
| Sep 29, 3:52 AM CDT | Dense Fog Advisory | LSX | 5 hr |
| Oct 22, 3:59 AM CDT | Freeze Warning | LSX | 28 hr |
| Oct 23, 3:26 PM CDT | Freeze Warning | LSX | 42 hr |
| Oct 30, 5:11 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Oct 30, 9:29 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Oct 30, 1:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Oct 30, 4:05 PM CDT | Flash Flood Watch | LSX | 20 hr |
| Nov 16, 3:56 PM CST | Wind Advisory | LSX | 26 hr |
| Nov 17, 7:47 AM CST | Mesoscale Discussion | SPC | 88 min |
| Dec 2, 10:52 PM CST | Dense Fog Advisory | LSX | 11 hr |
| Dec 12, 3:50 AM CST | Winter Storm Watch | LSX | 24 hr |
| Dec 12, 3:41 PM CST | Winter Weather Advisory | LSX | 43 hr |
| Dec 20, 4:19 AM CST | Winter Storm Watch | LSX | 11 hr |
| Dec 20, 3:43 PM CST | Winter Storm Warning | LSX | 36 hr |
| Dec 21, 12:53 PM CST | Mesoscale Discussion | SPC | 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 | 5 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 27 |
| Special Weather Statement | 1 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 6 |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 5 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 4 |
| Cold | |
| Freeze Warning | 3 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.