Alert archive / Missouri / Lewis County
Weather alerts in Lewis County, Missouri, 2020
93 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lewis County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 93
- Warnings
- 29
- Watches
- 13
- Advisories
- 33
- Busiest month
- May16 alerts
- Busiest day
- November 10, 20208 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lewis County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 2 | 82% | 1 | 100% | 48 min |
| Flash flood warnings | 2 | 2 | 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 10, 7:25 PM CDT | River Flood Warning | LSX | 13 hr |
| Mar 12, 6:05 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Mar 18, 11:53 AM CDT | River Flood Warning | LSX | 38 days |
| Mar 19, 6:53 AM CDT | River Flood Warning | LSX | 28 hr |
| Mar 19, 11:52 AM CDT | River Flood Warning | LSX | 70 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 2, 8:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| 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, 10:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 11:17 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 15, 1:06 AM CDT | Mesoscale Discussion | SPC | 114 min |
| May 24, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| May 24, 5:18 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| May 24, 5:25 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 24, 5:44 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| May 24, 8:19 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 25, 2:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| May 29, 11:04 AM CDT | River Flood Warning | LSX | 22 hr |
| May 30, 1:42 PM CDT | River Flood Warning | LSX | 6 hr |
| 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 4, 11:21 AM CDT | River Flood Warning | LSX | 9 days |
| Jun 5, 7:12 AM CDT | Severe Thunderstorm Warning | LSX | 32 min |
| Jun 5, 7:59 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 7, 2:26 PM CDT | Flash Flood Watch | LSX | 48 hr |
| Jun 8, 12:00 PM CDT | River Flood Warning | LSX | 66 hr |
| Jun 8, 12:00 PM CDT | River Flood Warning | LSX | 42 hr |
| Jun 21, 3:24 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jun 29, 3:09 AM CDT | Flash Flood Watch | LSX | 58 hr |
| Jun 30, 12:21 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Jun 30, 6:13 AM CDT | Areal Flood Warning | LSX | 6 hr |
| Jun 30, 11:41 AM CDT | River Flood Warning | LSX | 53 hr |
| Jul 15, 9:56 AM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| 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 10, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| 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 |
| Nov 10, 3:56 AM CST | Wind Advisory | LSX | 12 hr |
| Nov 10, 8:52 AM CST | Mesoscale Discussion | SPC | 113 min |
| Nov 10, 11:22 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 10, 12:51 PM CST | Severe Thunderstorm Warning | LSX | 22 min |
| Nov 10, 1:07 PM CST | Severe Thunderstorm Warning | LSX | 53 min |
| Nov 10, 1:48 PM CST | Mesoscale Discussion | SPC | 87 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 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 | 11 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 18 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| River Flood Warning | 10 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| 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 | 6 |
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.