Alert archive / Missouri / Saint Charles County
Weather alerts in Saint Charles County, Missouri, 2012
127 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 127
- Warnings
- 54
- Watches
- 22
- Advisories
- 23
- Busiest month
- April24 alerts
- Busiest day
- April 28, 20129 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 5 tornado warnings covering Saint Charles County in 2012 had a tornado report inside them; 0 of 3 tornado reports fell inside a warning.
Saint Charles County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 3 | 0% | |
| Severe thunderstorm warnings | 38 | 28 | 26% | 75 | 95% | 22 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 27 | 6 | 78% | 20 | 55% | 11 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 346 | 163 | 53% | 601 | 81% | 22 min |
| NWS St. Louis, MO: flash flood warnings | 28 | 9 | 68% | 17 | 88% | 144 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 11, 3:18 PM CST | Winter Weather Advisory | LSX | 33 hr |
| Jan 16, 11:47 PM CST | Tornado Watch | SPC | 7 hr |
| Jan 17, 12:55 AM CST | Severe Thunderstorm Warning | LSX | 35 min |
| Jan 17, 1:23 AM CST | Severe Thunderstorm Warning | LSX | 37 min |
| Jan 17, 4:34 AM CST | Areal Flood Advisory | LSX | 60 days |
| Jan 20, 11:23 AM CST | Winter Weather Advisory | LSX | 12 hr |
| Feb 4, 6:59 AM CST | River Flood Warning | LSX | 9 hr |
| Feb 5, 11:42 PM CST | Dense Fog Advisory | LSX | 9 hr |
| Feb 12, 3:02 PM CST | Winter Weather Advisory | LSX | 39 hr |
| Feb 23, 2:28 PM CST | Wind Advisory | LSX | 16 hr |
| Feb 26, 5:25 AM CST | Red Flag Warning | LSX | 12 hr |
| Feb 29, 12:49 AM CST | Mesoscale Discussion | SPC | 56 min |
| Feb 29, 1:14 AM CST | Tornado Watch | SPC | 11 hr |
| Mar 2, 2:07 AM CST | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 2, 4:25 AM CST | Mesoscale Discussion | SPC | 95 min |
| Mar 2, 5:10 AM CST | Severe Thunderstorm Warning | LSX | 39 min |
| Mar 2, 5:13 AM CST | Severe Thunderstorm Warning | LSX | 47 min |
| Mar 2, 5:52 AM CST | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 2, 5:56 AM CST | Severe Thunderstorm Warning | LSX | 49 min |
| Mar 2, 1:59 PM CST | Wind Advisory | LSX | 4 hr |
| Mar 5, 2:00 PM CST | Red Flag Warning | LSX | 30 hr |
| Mar 5, 3:36 PM CST | Wind Advisory | LSX | 26 hr |
| Mar 6, 3:41 PM CST | Wind Advisory | LSX | 24 hr |
| Mar 15, 3:23 PM CDT | Severe Thunderstorm Warning | LSX | 37 min |
| Mar 15, 3:59 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Mar 15, 4:12 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| Mar 15, 4:46 PM CDT | Severe Thunderstorm Warning | LSX | 29 min |
| Mar 15, 9:39 PM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| Mar 17, 3:38 PM CDT | Flash Flood Watch | LSX | 6 hr |
| Mar 17, 5:13 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Mar 17, 7:35 PM CDT | River Flood Warning | LSX | 23 hr |
| Mar 23, 1:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 23, 6:43 PM CDT | Mesoscale Discussion | SPC | 32 min |
| Apr 9, 3:10 PM CDT | Freeze Watch | LSX | 12 hr |
| Apr 10, 2:45 AM CDT | Freeze Warning | LSX | 29 hr |
| Apr 11, 3:20 AM CDT | Freeze Warning | LSX | 29 hr |
| Apr 13, 9:19 PM CDT | Flash Flood Watch | LSX | 13 hr |
| Apr 14, 11:14 AM CDT | River Flood Warning | LSX | 20 hr |
| Apr 15, 3:50 AM CDT | Wind Advisory | LSX | 17 hr |
| Apr 15, 4:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 15, 4:42 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 15, 7:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Apr 15, 7:38 PM CDT | Severe Thunderstorm Warning | LSX | 32 min |
| Apr 16, 6:19 AM CDT | River Flood Warning | LSX | 6 hr |
| Apr 25, 4:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 25, 10:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 28, 1:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 28, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 2:26 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Apr 28, 2:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 28, 3:05 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Apr 28, 5:19 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Apr 28, 5:50 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Apr 28, 5:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 28, 6:01 PM CDT | Tornado Warning | LSX | 29 min |
| Apr 29, 1:44 AM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Apr 29, 4:00 PM CDT | Flash Flood Watch | LSX | 15 hr |
| May 1, 2:01 AM CDT | Flash Flood Watch | LSX | 7 hr |
| May 4, 10:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 4, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 20, 1:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 2, 1:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 4, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 4, 3:33 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Jun 4, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | 37 min |
| Jun 16, 7:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 16, 8:23 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 16, 8:28 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| Jun 17, 5:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 27, 3:24 AM CDT | Heat Advisory | LSX | 12 days |
| Jun 29, 3:30 PM CDT | Excessive Heat Warning | LSX | 8 days |
| Jul 2, 2:34 PM CDT | Severe Thunderstorm Warning | LSX | 26 min |
| Jul 2, 5:16 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 3:51 PM CDT | Heat Advisory | LSX | 4 days |
| Jul 19, 2:59 PM CDT | Excessive Heat Watch | LSX | 13 hr |
| Jul 20, 4:00 AM CDT | Excessive Heat Warning | LSX | 7 days |
| Jul 30, 3:29 PM CDT | Heat Advisory | LSX | 29 hr |
| Aug 1, 3:42 AM CDT | Heat Advisory | LSX | 15 hr |
| Aug 2, 3:54 PM CDT | Heat Advisory | LSX | 52 hr |
| Aug 4, 3:08 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 5:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 4, 6:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 9:38 PM CDT | Severe Thunderstorm Warning | LSX | 67 min |
| Aug 4, 10:22 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Aug 4, 11:46 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| Aug 8, 9:31 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Aug 8, 10:51 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Aug 16, 12:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 16, 1:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 16, 3:08 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Aug 31, 1:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Aug 31, 1:56 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 31, 2:48 PM CDT | Tornado Warning | LSX | 17 min |
| Aug 31, 5:34 PM CDT | Tornado Warning | LSX | 11 min |
| Aug 31, 6:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Sep 5, 3:07 AM CDT | Heat Advisory | LSX | 12 hr |
| Sep 6, 2:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Sep 6, 4:02 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Sep 7, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 7, 4:46 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Sep 7, 5:03 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Sep 7, 5:22 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Sep 7, 6:22 PM CDT | Severe Thunderstorm Warning | LSX | 53 min |
| Sep 25, 12:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Sep 25, 12:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Sep 25, 4:31 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Sep 25, 5:05 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 25, 5:09 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Sep 25, 6:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 25, 7:05 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Oct 7, 3:13 AM CDT | Frost Advisory | LSX | 30 hr |
| Oct 17, 11:45 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Oct 17, 1:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 17, 4:24 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Oct 17, 4:54 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Oct 17, 4:58 PM CDT | Tornado Warning | LSX | 32 min |
| Oct 17, 5:06 PM CDT | Tornado Warning | LSX | 24 min |
| Oct 17, 5:23 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Oct 25, 3:47 PM CDT | Freeze Watch | LSX | 12 hr |
| Oct 26, 3:35 AM CDT | Freeze Warning | LSX | 28 hr |
| Oct 27, 2:32 PM CDT | Freeze Warning | LSX | 17 hr |
| Oct 28, 2:39 PM CDT | Freeze Warning | LSX | 17 hr |
| Nov 11, 4:24 AM CST | Wind Advisory | LSX | 11 hr |
| Nov 20, 5:44 PM CST | Dense Fog Advisory | LSX | 20 hr |
| Dec 19, 3:34 PM CST | Wind Advisory | LSX | 29 hr |
| Dec 30, 3:03 PM CST | Winter Weather Advisory | LSX | 39 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 | 36 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 28 |
| Flooding | |
| River Flood Warning | 4 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Weather Advisory | 4 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.