Alert archive / Missouri / Saint Charles County
Weather alerts in Saint Charles County, Missouri, 2010
212 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 212
- Warnings
- 91
- Watches
- 42
- Advisories
- 37
- Busiest month
- June35 alerts
- Busiest day
- May 12, 20108 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 6 tornado warnings covering Saint Charles County in 2010 had a tornado report inside them.
Saint Charles County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 3 | 50% | 0 | ||
| Severe thunderstorm warnings | 40 | 24 | 40% | 21 | 81% | 15 min |
| Flash flood warnings | 4 | 2 | 50% | 4 | 25% | 52 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 94 | 16 | 83% | 43 | 84% | 33 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 301 | 122 | 59% | 404 | 62% | 23 min |
| NWS St. Louis, MO: flash flood warnings | 112 | 44 | 61% | 122 | 73% | 122 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 3, 11:33 AM CST | River Flood Warning | LSX | 13 days |
| Jan 5, 3:50 PM CST | Winter Storm Watch | LSX | 12 hr |
| Jan 6, 4:16 AM CST | Winter Storm Warning | LSX | 24 hr |
| Jan 6, 4:16 AM CST | Winter Weather Advisory | LSX | 37 hr |
| Jan 7, 4:16 AM CST | Wind Chill Advisory | LSX | 24 hr |
| Jan 7, 3:54 PM CST | Wind Chill Advisory | LSX | 43 hr |
| Jan 15, 3:42 PM CST | Freezing Fog Advisory | LSX | 20 hr |
| Jan 16, 2:33 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 17, 2:12 PM CST | Dense Fog Advisory | LSX | 22 hr |
| Jan 18, 3:00 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 20, 3:55 PM CST | Dense Fog Advisory | LSX | 17 hr |
| Jan 24, 9:35 PM CST | River Flood Warning | LSX | 24 hr |
| Jan 25, 11:38 AM CST | River Flood Warning | LSX | 3 days |
| Jan 25, 11:38 AM CST | River Flood Warning | LSX | 48 hr |
| Feb 4, 4:08 AM CST | Winter Weather Advisory | LSX | 44 hr |
| Feb 6, 4:18 AM CST | Winter Storm Watch | LSX | 36 hr |
| Feb 7, 3:55 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 12, 3:29 PM CST | Winter Weather Advisory | LSX | 63 hr |
| Mar 10, 7:48 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 10, 11:08 PM CST | Mesoscale Discussion | SPC | 97 min |
| Mar 11, 11:52 AM CST | River Flood Warning | LSX | 39 days |
| Mar 11, 11:52 AM CST | River Flood Warning | LSX | 33 days |
| Mar 14, 8:00 PM CDT | River Flood Warning | LSX | 4 days |
| Mar 25, 9:37 PM CDT | River Flood Warning | LSX | 10 hr |
| Mar 26, 3:56 PM CDT | River Flood Warning | LSX | 5 days |
| Mar 30, 2:47 PM CDT | Fire Weather Watch | LSX | 20 hr |
| Apr 4, 8:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Apr 4, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 4, 10:41 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Apr 4, 11:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Apr 4, 11:25 PM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| Apr 5, 12:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Apr 5, 2:51 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 8, 4:16 AM CDT | Frost Advisory | LSX | 29 hr |
| Apr 17, 3:34 PM CDT | Frost Advisory | LSX | 16 hr |
| Apr 24, 2:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 24, 3:20 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 24, 4:43 PM CDT | Tornado Warning | LSX | 32 min |
| Apr 24, 5:03 PM CDT | Tornado Warning | LSX | 57 min |
| Apr 24, 5:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Apr 25, 12:00 PM CDT | River Flood Warning | LSX | 6 days |
| Apr 25, 8:56 PM CDT | River Flood Warning | LSX | 4 days |
| Apr 25, 10:32 PM CDT | River Flood Warning | LSX | 6 days |
| Apr 30, 2:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 30, 2:40 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 30, 7:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 30, 8:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 30, 9:03 PM CDT | Tornado Watch | SPC | 6 hr |
| May 1, 10:14 PM CDT | Tornado Watch | SPC | 7 hr |
| May 3, 12:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 3, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 3, 4:50 PM CDT | Severe Thunderstorm Warning | LSX | 25 min |
| May 3, 5:09 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| May 3, 5:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 8, 4:02 AM CDT | Frost Advisory | LSX | 27 hr |
| May 12, 3:02 AM CDT | Severe Thunderstorm Warning | LSX | 58 min |
| May 12, 3:27 AM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| May 12, 4:00 AM CDT | Flash Flood Warning | LSX | 6 hr |
| May 12, 4:49 AM CDT | Flash Flood Watch | LSX | 35 hr |
| May 12, 4:51 AM CDT | Mesoscale Discussion | SPC | 54 min |
| May 12, 8:44 AM CDT | River Flood Warning | LSX | 13 hr |
| May 12, 10:09 AM CDT | Areal Flood Advisory | LSX | 6 hr |
| May 12, 12:28 PM CDT | River Flood Warning | LSX | 14 days |
| May 13, 12:11 PM CDT | River Flood Warning | LSX | 17 days |
| May 13, 12:11 PM CDT | River Flood Warning | LSX | 16 days |
| May 13, 5:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 13, 7:00 PM CDT | Severe Thunderstorm Warning | LSX | 30 min |
| Jun 1, 11:49 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 2, 1:31 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 5, 9:16 AM CDT | River Flood Warning | LSX | 25 hr |
| Jun 6, 2:58 PM CDT | Flash Flood Watch | LSX | 61 hr |
| Jun 7, 9:38 PM CDT | River Flood Warning | LSX | 24 hr |
| Jun 9, 10:43 AM CDT | River Flood Warning | LSX | 24 days |
| Jun 12, 12:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 12, 1:31 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 13, 11:38 AM CDT | River Flood Warning | LSX | 76 days |
| Jun 13, 11:38 AM CDT | River Flood Warning | LSX | 56 days |
| Jun 13, 11:55 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 13, 12:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 13, 2:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 13, 6:11 PM CDT | Severe Thunderstorm Warning | LSX | 37 min |
| Jun 13, 6:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 14, 2:17 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 15, 12:29 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 15, 1:00 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Jun 15, 2:24 PM CDT | Areal Flood Advisory | LSX | 5 hr |
| Jun 15, 2:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 9:26 PM CDT | River Flood Warning | LSX | 108 min |
| Jun 18, 4:14 AM CDT | Heat Advisory | LSX | 6 days |
| Jun 19, 2:42 AM CDT | Excessive Heat Warning | LSX | 5 days |
| Jun 19, 1:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 19, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 21, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 21, 4:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Jun 25, 1:45 PM CDT | Heat Advisory | LSX | 29 hr |
| Jun 27, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 27, 6:32 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Jun 27, 6:45 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Jun 27, 6:52 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Jun 27, 7:09 PM CDT | Severe Thunderstorm Warning | LSX | 36 min |
| Jun 27, 7:17 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Jun 27, 7:31 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Jul 7, 10:54 AM CDT | River Flood Warning | LSX | 8 days |
| Jul 8, 9:40 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Jul 9, 5:03 AM CDT | River Flood Warning | LSX | 8 hr |
| Jul 11, 12:17 PM CDT | Tornado Watch | SPC | 3 hr |
| Jul 11, 2:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 12, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 9:48 PM CDT | Flash Flood Warning | LSX | 5 hr |
| Jul 13, 6:11 AM CDT | River Flood Warning | LSX | 7 hr |
| Jul 13, 2:35 PM CDT | Heat Advisory | LSX | 52 hr |
| Jul 16, 4:06 PM CDT | Heat Advisory | LSX | 38 hr |
| Jul 18, 5:58 AM CDT | Mesoscale Discussion | SPC | 32 min |
| Jul 18, 6:22 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 18, 7:57 AM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Jul 19, 6:59 AM CDT | Severe Thunderstorm Warning | LSX | 76 min |
| Jul 19, 10:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 19, 10:38 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 5:08 AM CDT | Flash Flood Watch | LSX | 22 hr |
| Jul 20, 7:33 AM CDT | Mesoscale Discussion | SPC | 27 min |
| Jul 20, 7:36 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 20, 8:24 AM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| Jul 20, 10:59 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 21, 3:39 PM CDT | Heat Advisory | LSX | 3 days |
| Jul 22, 9:58 AM CDT | River Flood Warning | LSX | 3 days |
| Jul 23, 3:57 AM CDT | Excessive Heat Warning | LSX | 40 hr |
| Jul 24, 8:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 24, 9:01 PM CDT | Severe Thunderstorm Warning | LSX | 29 min |
| Jul 24, 9:17 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| Jul 27, 3:50 PM CDT | Heat Advisory | LSX | 28 hr |
| Jul 30, 5:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 30, 6:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Aug 1, 3:13 PM CDT | Heat Advisory | LSX | 3 days |
| Aug 3, 4:43 AM CDT | Excessive Heat Warning | LSX | 39 hr |
| Aug 4, 3:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 6, 2:56 PM CDT | Excessive Heat Watch | LSX | 49 hr |
| Aug 8, 3:55 AM CDT | Excessive Heat Warning | LSX | 7 days |
| Aug 10, 3:42 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 10, 6:29 PM CDT | Severe Thunderstorm Warning | LSX | 16 min |
| Aug 12, 1:06 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Aug 12, 1:34 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Aug 12, 2:27 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Aug 12, 3:09 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Aug 12, 3:19 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Aug 13, 9:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Aug 14, 2:46 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| Aug 15, 10:54 AM CDT | River Flood Warning | LSX | 3 days |
| Aug 20, 2:39 AM CDT | Flash Flood Watch | LSX | 25 hr |
| Aug 20, 11:32 AM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| Aug 20, 11:59 AM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Aug 20, 12:51 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Aug 20, 8:16 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Aug 20, 8:47 PM CDT | Tornado Warning | LSX | 43 min |
| Aug 21, 1:28 PM CDT | River Flood Warning | LSX | 56 hr |
| Sep 2, 3:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Sep 2, 4:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 2, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 2, 7:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 8:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Sep 8, 3:48 PM CDT | Flash Flood Watch | LSX | 27 hr |
| Sep 11, 1:41 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| Sep 18, 2:21 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 18, 5:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 18, 8:27 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| Sep 18, 8:46 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Sep 18, 9:37 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Sep 18, 9:54 PM CDT | Severe Thunderstorm Warning | LSX | 25 min |
| Sep 18, 10:00 PM CDT | Flash Flood Warning | LSX | 5 hr |
| Sep 19, 1:47 AM CDT | River Flood Warning | LSX | 5 hr |
| Sep 19, 3:17 AM CDT | Areal Flood Warning | LSX | 12 hr |
| Sep 22, 11:44 AM CDT | River Flood Warning | LSX | 7 days |
| Oct 4, 4:16 AM CDT | Frost Advisory | LSX | 28 hr |
| Oct 24, 3:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 24, 8:22 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Oct 24, 8:44 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Oct 25, 9:36 PM CDT | Mesoscale Discussion | SPC | 24 min |
| Oct 25, 10:03 PM CDT | Tornado Watch | SPC | 9 hr |
| Oct 26, 2:21 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Oct 26, 3:34 AM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Oct 26, 4:09 AM CDT | Severe Thunderstorm Warning | LSX | 66 min |
| Oct 26, 7:30 PM CDT | Fire Weather Watch | LSX | 9 hr |
| Oct 27, 4:47 AM CDT | Red Flag Warning | LSX | 12 hr |
| Oct 27, 3:53 PM CDT | Freeze Watch | LSX | 12 hr |
| Oct 28, 3:47 AM CDT | Freeze Warning | LSX | 29 hr |
| Oct 29, 2:43 AM CDT | Fire Weather Watch | LSX | 13 hr |
| Oct 29, 3:58 PM CDT | Red Flag Warning | LSX | 26 hr |
| Nov 6, 3:47 PM CDT | Fire Weather Watch | LSX | 25 hr |
| Nov 7, 3:57 PM CST | Red Flag Warning | LSX | 26 hr |
| Nov 22, 4:50 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 22, 5:17 PM CST | Severe Thunderstorm Warning | LSX | 43 min |
| Nov 22, 5:37 PM CST | Severe Thunderstorm Warning | LSX | 38 min |
| Nov 22, 6:12 PM CST | Severe Thunderstorm Warning | LSX | 38 min |
| Nov 22, 6:43 PM CST | Severe Thunderstorm Warning | LSX | 36 min |
| Nov 22, 7:31 PM CST | Mesoscale Discussion | SPC | 89 min |
| Nov 24, 7:13 AM CST | Areal Flood Advisory | LSX | 7 hr |
| Nov 24, 12:26 PM CST | River Flood Warning | LSX | 33 hr |
| Nov 24, 3:48 PM CST | Flash Flood Watch | LSX | 12 hr |
| Nov 24, 9:26 PM CST | Areal Flood Advisory | LSX | 6 hr |
| Nov 25, 3:31 AM CST | Areal Flood Advisory | LSX | 6 hr |
| Dec 11, 4:15 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 11, 4:09 PM CST | Wind Advisory | LSX | 29 hr |
| Dec 12, 4:19 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Dec 15, 4:00 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 23, 12:07 PM CST | Winter Weather Advisory | LSX | 40 hr |
| Dec 31, 12:44 AM CST | Mesoscale Discussion | SPC | 61 min |
| Dec 31, 2:25 AM CST | Severe Thunderstorm Watch | SPC | 2 hr |
| Dec 31, 4:05 AM CST | Mesoscale Discussion | SPC | 115 min |
| Dec 31, 5:45 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | 8 hr |
| Dec 31, 10:56 AM CST | Tornado Warning | LSX | 64 min |
| Dec 31, 11:22 AM CST | Tornado Warning | LSX | 53 min |
| Dec 31, 11:59 AM CST | Tornado Warning | LSX | 61 min |
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 archive20092011
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.