Alert archive / Missouri / Shelby County
Weather alerts in Shelby County, Missouri, 2012
56 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Shelby County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 56
- Warnings
- 9
- Watches
- 9
- Advisories
- 21
- Busiest month
- May10 alerts
- Busiest day
- May 4, 20124 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Shelby County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 0 | 100% | 1 | 0% | |
| 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 |
| 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 28, 3:55 PM CST | Wind Advisory | LSX | 26 hr |
| Mar 2, 11:06 AM CST | Mesoscale Discussion | SPC | 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 23, 1:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 23, 6:43 PM CDT | Mesoscale Discussion | SPC | 32 min |
| Mar 27, 8:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 28, 11:21 PM CDT | Mesoscale Discussion | SPC | 84 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 15, 3:50 AM CDT | Wind Advisory | LSX | 17 hr |
| Apr 15, 4:42 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 25, 7:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 3, 6:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| May 3, 7:09 PM CDT | Tornado Watch | SPC | 6 hr |
| May 3, 11:18 PM CDT | Mesoscale Discussion | SPC | 27 min |
| May 4, 12:53 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 4, 2:16 AM CDT | Mesoscale Discussion | SPC | 119 min |
| May 6, 1:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 6, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 6, 2:37 PM CDT | Severe Thunderstorm Warning | LSX | 53 min |
| May 6, 3:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 24, 5:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 5:17 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Jun 17, 5:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 27, 3:24 AM CDT | Heat Advisory | LSX | 12 days |
| Jul 2, 3:59 PM CDT | Heat Advisory | LSX | 5 days |
| Jul 2, 6:39 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Jul 13, 3:28 PM CDT | Areal Flood Advisory | LSX | 4 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 | Heat Advisory | LSX | 7 days |
| Jul 29, 3:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 2:23 PM CDT | Heat Advisory | LSX | 30 hr |
| Aug 8, 9:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 22, 3:50 PM CDT | Frost Advisory | LSX | 16 hr |
| Sep 25, 12:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Oct 6, 3:31 PM CDT | Freeze Warning | LSX | 16 hr |
| Oct 17, 11:45 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Oct 25, 3:47 PM CDT | Freeze Watch | LSX | 12 hr |
| Oct 26, 3:35 AM CDT | Freeze Warning | LSX | 28 hr |
| Nov 20, 5:44 PM CST | Dense Fog Advisory | LSX | 20 hr |
| Dec 2, 3:28 AM CST | Dense Fog Advisory | LSX | 6 hr |
| Dec 2, 9:36 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Dec 2, 6:25 PM CST | Dense Fog Advisory | LSX | 10 hr |
| Dec 18, 3:23 PM CST | Winter Weather Advisory | LSX | 35 hr |
| Dec 19, 3:34 PM CST | Wind Advisory | LSX | 29 hr |
| Dec 20, 2:50 AM CST | Winter Storm Warning | LSX | 15 hr |
| Dec 20, 7:49 AM CST | Mesoscale Discussion | SPC | 4 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 | 3 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 17 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
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.