Alert archive / Missouri / Knox County
Weather alerts in Knox County, Missouri, 2023
59 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 59
- Warnings
- 13
- Watches
- 14
- Advisories
- 14
- Busiest month
- April10 alerts
- Busiest day
- March 31, 20236 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 2 tornado reports fell inside a warning.
Knox County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 2 | 0% | |||
| Severe thunderstorm warnings | 6 | 3 | 50% | 2 | 50% | 37 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 33 | 8 | 76% | 25 | 76% | 11 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 380 | 218 | 43% | 1,082 | 84% | 22 min |
| NWS St. Louis, MO: flash flood warnings | 38 | 22 | 42% | 44 | 77% | 100 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, 11:43 PM CST | Dense Fog Advisory | LSX | 15 hr |
| Jan 23, 2:12 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 9, 1:42 AM CST | Winter Weather Advisory | LSX | 10 hr |
| Feb 13, 2:12 PM CST | Wind Advisory | LSX | 30 hr |
| Feb 15, 2:58 AM CST | Winter Weather Advisory | LSX | 39 hr |
| Feb 24, 2:47 PM CST | Winter Weather Advisory | LSX | 13 hr |
| Feb 26, 1:27 AM CST | Wind Advisory | LSX | 41 hr |
| Feb 27, 1:43 AM CST | Mesoscale Discussion | SPC | 62 min |
| Mar 30, 3:03 AM CDT | Wind Advisory | LSX | 58 hr |
| Mar 31, 8:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 31, 11:24 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Mar 31, 11:46 AM CDT | Tornado Watch | SPC | 8 hr |
| Mar 31, 1:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Mar 31, 3:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 31, 5:40 PM CDT | High Wind Warning | LSX | 3 hr |
| Apr 3, 2:28 PM CDT | Wind Advisory | LSX | 41 hr |
| Apr 4, 1:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 4, 2:48 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 4, 4:48 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Apr 4, 5:19 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Apr 4, 6:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Apr 21, 2:50 AM CDT | Freeze Watch | LSX | 25 hr |
| Apr 22, 3:57 AM CDT | Freeze Warning | LSX | 29 hr |
| Apr 22, 2:45 PM CDT | Freeze Watch | LSX | 12 hr |
| Apr 23, 2:41 AM CDT | Freeze Warning | LSX | 29 hr |
| May 6, 3:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 8:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 6, 9:00 PM CDT | Tornado Watch | SPC | 5 hr |
| May 7, 10:02 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 13, 12:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 14, 2:59 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 4, 5:30 PM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| Jun 24, 5:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 24, 6:28 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 29, 5:18 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 29, 5:49 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 29, 7:58 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 29, 9:19 AM CDT | Severe Thunderstorm Warning | LSX | 56 min |
| Jun 29, 10:20 AM CDT | Severe Thunderstorm Warning | LSX | 55 min |
| Jun 30, 7:24 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 14, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 8:40 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 1:09 PM CDT | Heat Advisory | LSX | 4 days |
| Jul 27, 3:05 AM CDT | Excessive Heat Warning | LSX | 62 hr |
| Jul 29, 11:28 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 1:01 PM CDT | Flood Watch | LSX | 21 hr |
| Aug 4, 2:00 PM CDT | Flood Watch | LSX | 14 hr |
| Aug 4, 11:52 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Aug 4, 11:53 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Aug 10, 1:05 AM CDT | Dense Fog Advisory | LSX | 8 hr |
| Aug 11, 9:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 11, 11:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 2:51 AM CDT | Excessive Heat Watch | LSX | 25 hr |
| Aug 19, 3:24 AM CDT | Excessive Heat Warning | LSX | 7 days |
| Aug 26, 12:41 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 12, 2:31 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| Oct 28, 2:16 PM CDT | Freeze Warning | LSX | 44 hr |
| Nov 25, 2:33 AM CST | Winter Weather Advisory | LSX | 30 hr |
| Dec 22, 8:40 PM CST | Dense Fog Advisory | LSX | 12 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 | 6 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 18 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flood Watch | 2 |
| Winter | |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.