Alert archive / Missouri / Saint Charles County
Weather alerts in Saint Charles County, Missouri, 2022
100 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Saint Charles County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 100
- Warnings
- 43
- Watches
- 12
- Advisories
- 26
- Busiest month
- May19 alerts
- Busiest day
- May 19, 20229 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Saint Charles County in 2022 had a tornado report inside them.
Saint Charles County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 17 | 12 | 29% | 22 | 68% | 34 min |
| Flash flood warnings | 3 | 3 | 0% | 8 | 100% | 163 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 10 | 2 | 80% | 10 | 50% | 9 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 173 | 88 | 49% | 343 | 81% | 21 min |
| NWS St. Louis, MO: flash flood warnings | 40 | 20 | 50% | 95 | 91% | 130 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 7, 5:52 PM CST | Winter Weather Advisory | LSX | 27 hr |
| Jan 14, 2:58 AM CST | Winter Weather Advisory | LSX | 39 hr |
| Jan 31, 2:49 AM CST | Winter Storm Watch | LSX | 24 hr |
| Feb 1, 2:41 AM CST | Winter Storm Warning | LSX | 69 hr |
| Feb 2, 1:44 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 15, 2:48 PM CST | Flood Watch | LSX | 48 hr |
| Feb 16, 1:38 PM CST | Winter Weather Advisory | LSX | 30 hr |
| Feb 17, 6:00 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 22, 2:21 PM CST | Winter Storm Warning | LSX | 51 hr |
| Feb 22, 2:21 PM CST | Winter Weather Advisory | LSX | 58 hr |
| Mar 5, 7:25 PM CST | Mesoscale Discussion | SPC | 95 min |
| Mar 5, 11:02 PM CST | Severe Thunderstorm Warning | LSX | 43 min |
| Mar 6, 9:29 PM CST | Areal Flood Advisory | LSX | 4 hr |
| Mar 6, 9:47 PM CST | Areal Flood Advisory | LSX | 4 hr |
| Mar 9, 2:21 PM CST | Winter Weather Advisory | LSX | 52 hr |
| Mar 30, 9:03 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 31, 2:37 PM CDT | Freeze Warning | LSX | 18 hr |
| Apr 8, 3:35 AM CDT | Freeze Warning | LSX | 28 hr |
| Apr 13, 7:38 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 2:27 PM CDT | Frost Advisory | LSX | 43 hr |
| Apr 25, 2:40 AM CDT | Frost Advisory | LSX | 29 hr |
| Apr 30, 1:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 3, 1:16 AM CDT | Severe Thunderstorm Warning | LSX | 31 min |
| May 5, 11:57 AM CDT | River Flood Warning | LSX | 20 hr |
| May 5, 4:51 PM CDT | River Flood Warning | LSX | 5 days |
| May 5, 4:51 PM CDT | River Flood Warning | LSX | 6 days |
| May 5, 9:19 PM CDT | River Flood Warning | LSX | 54 hr |
| May 13, 5:22 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 10:05 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 11:00 AM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| May 19, 11:27 AM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| May 19, 4:38 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| May 19, 4:39 PM CDT | Tornado Watch | SPC | 6 hr |
| May 19, 4:55 PM CDT | Tornado Warning | LSX | 35 min |
| May 19, 5:16 PM CDT | Tornado Warning | LSX | 29 min |
| May 19, 5:19 PM CDT | Tornado Warning | LSX | 26 min |
| May 19, 5:46 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| May 20, 9:54 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| May 20, 10:43 PM CDT | Severe Thunderstorm Warning | LSX | 21 min |
| May 25, 4:44 PM CDT | Severe Thunderstorm Warning | LSX | 32 min |
| May 31, 3:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 3, 12:26 PM CDT | River Flood Warning | LSX | 43 hr |
| Jun 3, 8:31 PM CDT | River Flood Warning | LSX | 14 hr |
| Jun 8, 4:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 11, 2:02 PM CDT | Heat Advisory | LSX | 31 hr |
| Jun 12, 2:52 PM CDT | Heat Advisory | LSX | 5 days |
| Jun 13, 2:58 AM CDT | Excessive Heat Warning | LSX | 4 days |
| Jun 17, 1:42 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 17, 3:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 3:59 AM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Jun 17, 4:40 AM CDT | Severe Thunderstorm Warning | LSX | 65 min |
| Jun 25, 5:02 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 7:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 25, 9:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 25, 11:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 3, 1:08 PM CDT | Heat Advisory | LSX | 72 hr |
| Jul 4, 2:39 PM CDT | Excessive Heat Warning | LSX | 4 days |
| Jul 8, 4:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 2:02 PM CDT | Heat Advisory | LSX | 3 days |
| Jul 25, 2:59 AM CDT | Flood Watch | LSX | 30 hr |
| Jul 26, 1:16 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 26, 1:45 AM CDT | Areal Flood Advisory | LSX | 19 min |
| Jul 26, 2:04 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 26, 4:10 AM CDT | River Flood Warning | LSX | 21 days |
| Jul 26, 7:21 AM CDT | Flash Flood Warning | LSX | 5 hr |
| Jul 26, 12:09 PM CDT | Areal Flood Warning | LSX | 4 hr |
| Jul 27, 3:44 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 28, 12:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:03 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 1, 3:24 AM CDT | Heat Advisory | LSX | 64 hr |
| Aug 2, 3:00 PM CDT | Heat Advisory | LSX | 28 hr |
| Aug 3, 1:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 3, 1:45 PM CDT | Flood Watch | LSX | 20 hr |
| Aug 3, 1:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 3, 2:27 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Aug 3, 3:04 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Aug 3, 3:12 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Aug 3, 3:21 PM CDT | Severe Thunderstorm Warning | LSX | 26 min |
| Aug 3, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 3, 4:29 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Aug 3, 10:02 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 3, 11:15 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 4, 7:33 AM CDT | River Flood Warning | LSX | 4 hr |
| Aug 5, 2:51 AM CDT | Heat Advisory | LSX | 4 days |
| Aug 8, 9:58 AM CDT | Flood Watch | LSX | 18 hr |
| Aug 25, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | 27 min |
| Oct 7, 2:42 AM CDT | Frost Advisory | LSX | 30 hr |
| Oct 12, 2:35 PM CDT | Red Flag Warning | LSX | 29 hr |
| Oct 13, 3:15 PM CDT | Red Flag Warning | LSX | 29 hr |
| Oct 16, 2:44 AM CDT | Freeze Watch | LSX | 12 hr |
| Oct 16, 2:23 PM CDT | Freeze Warning | LSX | 43 hr |
| Nov 3, 2:08 PM CDT | Wind Advisory | LSX | 45 hr |
| Dec 1, 1:50 PM CST | Wind Advisory | LSX | 37 hr |
| Dec 6, 3:15 AM CST | Dense Fog Advisory | LSX | 7 hr |
| Dec 19, 3:48 PM CST | Winter Storm Watch | LSX | 36 hr |
| Dec 20, 2:54 AM CST | Wind Chill Watch | LSX | 25 hr |
| Dec 21, 3:30 AM CST | Wind Chill Warning | LSX | 71 hr |
| Dec 21, 3:30 AM CST | Winter Storm Warning | LSX | 41 hr |
| Dec 22, 10:59 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 22, 2:55 PM CST | Wind Chill Advisory | LSX | 42 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
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.