Alert archive / Missouri / Lewis County
Weather alerts in Lewis County, Missouri, 2018
95 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 95
- Warnings
- 35
- Watches
- 7
- Advisories
- 33
- Busiest month
- June15 alerts
- Busiest day
- June 28, 20185 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 12 | 5 | 58% | 11 | 82% | 28 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 20 | 3 | 85% | 19 | 42% | 14 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 218 | 101 | 54% | 375 | 80% | 23 min |
| NWS St. Louis, MO: flash flood warnings | 45 | 19 | 58% | 48 | 85% | 90 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 2, 3:57 PM CST | Wind Chill Advisory | LSX | 43 hr |
| Jan 6, 3:35 AM CST | Winter Weather Advisory | LSX | 44 hr |
| Jan 7, 9:42 PM CST | Dense Fog Advisory | LSX | 10 hr |
| Jan 8, 3:36 PM CST | Dense Fog Advisory | LSX | 20 hr |
| Jan 9, 3:28 PM CST | Dense Fog Advisory | LSX | 18 hr |
| Jan 11, 3:14 AM CST | Winter Weather Advisory | LSX | 27 hr |
| Jan 11, 9:36 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 3:22 PM CST | Wind Chill Advisory | LSX | 45 hr |
| Jan 14, 3:22 PM CST | Winter Weather Advisory | LSX | 21 hr |
| Feb 5, 11:15 AM CST | Winter Weather Advisory | LSX | 13 hr |
| Feb 6, 3:34 AM CST | Winter Weather Advisory | LSX | 25 hr |
| Feb 10, 4:20 AM CST | Winter Weather Advisory | LSX | 29 hr |
| Feb 20, 2:50 PM CST | Winter Weather Advisory | LSX | 44 hr |
| Feb 21, 3:33 AM CST | Winter Weather Advisory | LSX | 31 hr |
| Feb 22, 8:58 PM CST | Dense Fog Advisory | LSX | 7 hr |
| Feb 23, 3:18 PM CST | Winter Weather Advisory | LSX | 18 hr |
| Feb 28, 11:10 PM CST | Dense Fog Advisory | LSX | 5 hr |
| Mar 31, 3:36 PM CDT | Winter Weather Advisory | LSX | 30 hr |
| Apr 1, 1:38 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 2, 2:11 AM CDT | Dense Fog Advisory | LSX | 7 hr |
| May 2, 10:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 2, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 3, 11:40 AM CDT | River Flood Warning | LSX | 21 days |
| May 14, 12:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 14, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 15, 5:08 PM CDT | Special Weather Statement | LSX | 52 min |
| May 15, 5:15 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| May 19, 3:41 AM CDT | Dense Fog Advisory | LSX | 5 hr |
| May 19, 9:01 AM CDT | Dense Fog Advisory | LSX | 99 min |
| May 26, 12:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 26, 5:40 PM CDT | Special Weather Statement | LSX | 65 min |
| May 26, 5:45 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| May 26, 6:50 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| May 27, 5:38 PM CDT | Special Weather Statement | LSX | 52 min |
| Jun 10, 4:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 11, 4:15 PM CDT | Severe Thunderstorm Warning | LSX | 19 min |
| Jun 11, 4:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 1:03 PM CDT | Special Weather Statement | LSX | 42 min |
| Jun 14, 1:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 15, 3:53 AM CDT | Heat Advisory | LSX | 5 days |
| Jun 19, 12:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 20, 4:05 PM CDT | Special Weather Statement | LSX | 40 min |
| Jun 22, 10:01 PM CDT | River Flood Warning | LSX | 20 days |
| Jun 27, 3:46 AM CDT | Heat Advisory | LSX | 5 days |
| Jun 28, 10:57 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 1:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 2:00 PM CDT | Severe Thunderstorm Warning | LSX | 60 min |
| Jun 28, 2:37 PM CDT | Severe Thunderstorm Warning | LSX | 53 min |
| Jun 28, 2:50 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Jul 3, 3:31 AM CDT | Heat Advisory | LSX | 64 hr |
| Jul 5, 1:05 PM CDT | Special Weather Statement | LSX | 40 min |
| Jul 12, 3:35 AM CDT | Heat Advisory | LSX | 64 hr |
| Jul 14, 3:02 PM CDT | Special Weather Statement | LSX | 43 min |
| Jul 19, 6:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jul 19, 6:49 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 7:04 PM CDT | Severe Thunderstorm Warning | LSX | 56 min |
| Jul 19, 7:12 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Jul 19, 7:56 PM CDT | Severe Thunderstorm Warning | LSX | 64 min |
| Jul 19, 9:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Aug 24, 3:56 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Aug 24, 9:20 AM CDT | River Flood Warning | LSX | 10 hr |
| Aug 24, 3:33 PM CDT | Heat Advisory | LSX | 4 days |
| Aug 28, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 28, 8:18 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Aug 29, 12:17 AM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Aug 29, 2:09 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| Aug 29, 5:11 AM CDT | River Flood Warning | LSX | 7 hr |
| Aug 29, 5:11 AM CDT | River Flood Warning | LSX | 26 hr |
| Sep 4, 11:31 AM CDT | River Flood Warning | LSX | 16 days |
| Sep 6, 3:21 AM CDT | Flash Flood Watch | LSX | 60 hr |
| Sep 6, 8:32 AM CDT | River Flood Warning | LSX | 5 days |
| Sep 6, 10:20 PM CDT | River Flood Warning | LSX | 6 days |
| Sep 7, 5:10 AM CDT | River Flood Warning | LSX | 4 days |
| Sep 7, 10:12 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Sep 28, 12:04 PM CDT | River Flood Warning | LSX | 35 days |
| Oct 6, 11:46 AM CDT | River Flood Warning | LSX | 19 days |
| Oct 7, 8:42 PM CDT | River Flood Warning | LSX | 47 hr |
| Oct 7, 8:42 PM CDT | River Flood Warning | LSX | 68 hr |
| Oct 10, 1:34 AM CDT | River Flood Warning | LSX | 9 hr |
| Oct 10, 1:34 AM CDT | River Flood Warning | LSX | 54 hr |
| Oct 10, 3:24 PM CDT | River Flood Warning | LSX | 25 hr |
| Oct 15, 4:02 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 15, 2:02 PM CDT | Freeze Warning | LSX | 19 hr |
| Oct 20, 10:01 AM CDT | Wind Advisory | LSX | 8 hr |
| Oct 27, 3:25 PM CDT | Wind Advisory | LSX | 27 hr |
| Nov 3, 3:03 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| Nov 4, 2:47 PM CST | River Flood Warning | LSX | 68 hr |
| Nov 9, 10:52 AM CST | Winter Weather Advisory | LSX | 10 hr |
| Nov 23, 3:41 AM CST | Winter Storm Watch | LSX | 24 hr |
| Nov 24, 3:33 AM CST | Winter Storm Warning | LSX | 32 hr |
| Nov 25, 11:22 AM CST | Blizzard Warning | LSX | 16 hr |
| Nov 25, 3:57 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 2, 6:18 AM CST | River Flood Warning | LSX | 72 hr |
| Dec 2, 2:49 PM CST | River Flood Warning | LSX | 52 hr |
| Dec 14, 4:59 PM CST | Dense Fog Advisory | LSX | 6 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 | 12 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 7 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 19 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.