Alert archive / Missouri / Knox County
Weather alerts in Knox County, Missouri, 2020
77 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 77
- Warnings
- 14
- Watches
- 12
- Advisories
- 34
- Busiest month
- May11 alerts
- Busiest day
- November 10, 20206 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, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 1 | 88% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 10 | 2 | 80% | 12 | 17% | 5 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 157 | 69 | 56% | 280 | 79% | 24 min |
| NWS St. Louis, MO: flash flood warnings | 64 | 34 | 47% | 88 | 86% | 74 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 9, 3:56 PM CST | Winter Storm Watch | LSX | 12 hr |
| Jan 10, 3:58 AM CST | Winter Storm Warning | LSX | 40 hr |
| Jan 15, 2:54 PM CST | Winter Storm Watch | LSX | 24 hr |
| Jan 16, 2:57 PM CST | Winter Weather Advisory | LSX | 33 hr |
| Jan 17, 9:45 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 17, 4:07 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 18, 3:26 PM CST | Wind Chill Advisory | LSX | 20 hr |
| Jan 21, 3:15 PM CST | Winter Weather Advisory | LSX | 3 days |
| Jan 26, 3:32 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Jan 26, 3:09 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Feb 4, 2:46 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 11, 3:27 PM CST | Winter Weather Advisory | LSX | 36 hr |
| Feb 12, 3:42 PM CST | Wind Chill Advisory | LSX | 22 hr |
| Feb 13, 2:50 PM CST | Wind Chill Advisory | LSX | 17 hr |
| Feb 17, 6:10 PM CST | Dense Fog Advisory | LSX | 7 hr |
| Feb 24, 3:29 PM CST | Winter Weather Advisory | LSX | 44 hr |
| Feb 25, 3:12 AM CST | Winter Weather Advisory | LSX | 27 hr |
| Mar 4, 2:40 PM CST | Fire Weather Watch | LSX | 13 hr |
| Mar 5, 3:17 AM CST | Red Flag Warning | LSX | 15 hr |
| Mar 12, 6:05 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Mar 19, 2:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 23, 3:09 AM CDT | Dense Fog Advisory | LSX | 7 hr |
| Mar 25, 3:31 AM CDT | Dense Fog Advisory | LSX | 8 hr |
| Mar 28, 1:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 28, 2:45 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 28, 3:23 PM CDT | Wind Advisory | LSX | 26 hr |
| Apr 8, 1:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 8, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 8, 3:36 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Apr 9, 3:53 AM CDT | Wind Advisory | LSX | 15 hr |
| Apr 12, 3:15 AM CDT | Wind Advisory | LSX | 31 hr |
| Apr 13, 3:44 PM CDT | Freeze Warning | LSX | 17 hr |
| Apr 16, 3:03 AM CDT | Winter Weather Advisory | LSX | 28 hr |
| Apr 16, 5:43 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 17, 11:46 AM CDT | Freeze Warning | LSX | 20 hr |
| Apr 28, 3:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 8, 3:32 AM CDT | Frost Advisory | LSX | 28 hr |
| May 10, 2:43 PM CDT | Frost Advisory | LSX | 17 hr |
| May 14, 3:45 AM CDT | Flash Flood Watch | LSX | 25 hr |
| May 14, 3:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 14, 8:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 14, 10:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 11:17 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 24, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| May 24, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| May 24, 5:25 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 25, 2:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 3, 9:52 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 3, 1:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 3, 6:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 5, 7:12 AM CDT | Severe Thunderstorm Warning | LSX | 32 min |
| Jun 7, 2:26 PM CDT | Flash Flood Watch | LSX | 48 hr |
| Jun 29, 3:09 AM CDT | Flash Flood Watch | LSX | 58 hr |
| Jul 17, 1:59 AM CDT | Heat Advisory | LSX | 65 hr |
| Jul 24, 11:43 AM CDT | Heat Advisory | LSX | 56 hr |
| Aug 10, 2:24 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Aug 10, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 2:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 11, 2:19 PM CDT | Flash Flood Watch | LSX | 20 hr |
| Oct 4, 3:08 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 15, 3:35 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 16, 2:29 PM CDT | Wind Advisory | LSX | 28 hr |
| Oct 16, 2:34 PM CDT | Red Flag Warning | LSX | 27 hr |
| Oct 21, 9:34 PM CDT | Dense Fog Advisory | LSX | 10 hr |
| Oct 23, 4:01 AM CDT | Freeze Watch | LSX | 10 hr |
| Oct 23, 2:25 PM CDT | Freeze Warning | LSX | 16 hr |
| Nov 10, 3:56 AM CST | Wind Advisory | LSX | 12 hr |
| Nov 10, 8:52 AM CST | Mesoscale Discussion | SPC | 113 min |
| Nov 10, 11:03 AM CST | Severe Thunderstorm Warning | LSX | 28 min |
| Nov 10, 11:22 AM CST | Severe Thunderstorm Watch | SPC | 7 hr |
| Nov 10, 12:05 PM CST | Severe Thunderstorm Warning | LSX | 25 min |
| Nov 10, 12:27 PM CST | Severe Thunderstorm Warning | LSX | 25 min |
| Nov 14, 3:12 AM CST | Wind Advisory | LSX | 36 hr |
| Nov 23, 4:14 PM CST | Winter Weather Advisory | LSX | 5 hr |
| Dec 7, 8:40 PM CST | Dense Fog Advisory | LSX | 13 hr |
| Dec 23, 3:15 AM CST | Wind Advisory | LSX | 21 hr |
| Dec 28, 7:31 PM CST | Winter Weather Advisory | LSX | 25 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 | 8 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 17 |
| Flooding | |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.