Alert archive / Missouri / Shelby County
Weather alerts in Shelby County, Missouri, 2011
124 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 124
- Warnings
- 28
- Watches
- 29
- Advisories
- 27
- Busiest month
- June35 alerts
- Busiest day
- May 25, 20119 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 2 tornado warnings covering Shelby County in 2011 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Shelby County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 16 | 6 | 63% | 7 | 71% | 23 min |
| Flash flood warnings | 3 | 1 | 67% | 1 | 100% | 202 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 135 | 21 | 84% | 56 | 80% | 23 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 511 | 237 | 54% | 1,031 | 66% | 23 min |
| NWS St. Louis, MO: flash flood warnings | 80 | 34 | 57% | 84 | 83% | 150 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 9, 3:02 AM CST | Winter Storm Watch | LSX | 24 hr |
| Jan 10, 3:27 AM CST | Winter Weather Advisory | LSX | 39 hr |
| Jan 17, 7:23 AM CST | Winter Weather Advisory | LSX | 5 hr |
| Jan 18, 3:33 PM CST | Winter Weather Advisory | LSX | 48 hr |
| Jan 22, 4:11 AM CST | Winter Weather Advisory | LSX | 34 hr |
| Jan 29, 8:30 PM CST | Winter Storm Watch | LSX | 19 hr |
| Jan 30, 3:56 PM CST | Winter Storm Warning | LSX | 60 hr |
| Jan 31, 2:08 PM CST | Blizzard Warning | LSX | 46 hr |
| Feb 1, 10:36 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 3:36 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 3:55 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Feb 8, 3:55 AM CST | Wind Chill Advisory | LSX | 8 hr |
| Feb 9, 3:55 PM CST | Wind Chill Advisory | LSX | 18 hr |
| Feb 16, 4:17 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Feb 16, 9:03 AM CST | Dense Fog Advisory | LSX | 3 hr |
| Feb 23, 3:57 PM CST | Winter Weather Advisory | LSX | 36 hr |
| Feb 23, 10:30 PM CST | Dense Fog Advisory | LSX | 8 hr |
| Feb 24, 3:57 AM CST | Winter Storm Warning | LSX | 24 hr |
| Feb 24, 5:20 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 26, 9:49 PM CST | Dense Fog Advisory | LSX | 6 hr |
| Feb 27, 1:18 PM CST | Flood Watch | LSX | 11 hr |
| Feb 27, 3:10 PM CST | Dense Fog Advisory | LSX | 6 hr |
| Feb 27, 5:10 PM CST | Mesoscale Discussion | SPC | 35 min |
| Feb 27, 5:33 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Feb 27, 5:42 PM CST | Severe Thunderstorm Warning | LSX | 48 min |
| Mar 25, 3:26 PM CDT | Winter Weather Advisory | LSX | 31 hr |
| Apr 2, 4:05 AM CDT | Wind Advisory | LSX | 40 hr |
| Apr 3, 8:11 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 3, 10:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 3, 11:14 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Apr 9, 1:42 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Apr 10, 10:43 AM CDT | Wind Advisory | LSX | 8 hr |
| Apr 10, 5:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 10, 6:05 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 12:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Apr 15, 12:47 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 19, 2:53 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 19, 3:11 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 19, 5:52 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 22, 9:36 AM CDT | Flash Flood Warning | LSX | 3 hr |
| May 3, 3:36 AM CDT | Frost Advisory | LSX | 28 hr |
| May 11, 11:37 AM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| May 12, 5:31 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 12, 8:13 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| May 12, 8:41 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| May 21, 5:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 22, 4:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 10:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 12:51 PM CDT | Tornado Watch | SPC | 10 hr |
| May 24, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 24, 3:44 PM CDT | Flash Flood Watch | LSX | 32 hr |
| May 24, 4:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 25, 12:48 AM CDT | Mesoscale Discussion | SPC | 57 min |
| May 25, 1:22 AM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 3:09 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| May 25, 3:55 AM CDT | Flash Flood Warning | LSX | 6 hr |
| May 25, 7:47 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 25, 10:37 AM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 1:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 25, 2:02 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| May 25, 2:11 PM CDT | Tornado Warning | LSX | 49 min |
| May 28, 12:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| May 29, 1:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 2:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 2:52 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 3:41 PM CDT | Severe Thunderstorm Warning | LSX | 64 min |
| Jun 9, 4:06 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Jun 9, 4:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 9, 4:36 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Jun 9, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 9, 5:09 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Jun 9, 9:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 11:16 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Jun 9, 11:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 10, 4:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 10, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 7:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 10, 9:47 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Jun 13, 5:16 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 13, 6:52 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 13, 10:04 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 13, 4:02 PM CDT | Flash Flood Watch | LSX | 39 hr |
| Jun 13, 11:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 14, 2:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 14, 3:53 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 14, 7:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 15, 1:55 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 18, 5:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 25, 3:51 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 26, 2:43 PM CDT | Flash Flood Watch | LSX | 31 hr |
| Jun 26, 6:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 6:55 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 26, 10:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 27, 12:26 AM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Jun 27, 12:55 AM CDT | Tornado Warning | LSX | 20 min |
| Jun 27, 1:32 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 5:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 29, 4:09 PM CDT | Heat Advisory | LSX | 4 days |
| Jul 2, 2:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 12:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jul 8, 3:17 PM CDT | Heat Advisory | LSX | 4 days |
| Jul 12, 1:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 2:08 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Jul 12, 2:54 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Jul 12, 6:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 14, 3:29 PM CDT | Excessive Heat Watch | LSX | 23 hr |
| Jul 15, 2:23 PM CDT | Excessive Heat Warning | LSX | 19 days |
| Jul 24, 4:00 PM CDT | Excessive Heat Watch | LSX | 24 hr |
| Jul 25, 4:12 PM CDT | Heat Advisory | LSX | 9 days |
| Jul 28, 10:51 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Jul 29, 3:00 AM CDT | Excessive Heat Watch | LSX | 37 hr |
| Jul 30, 6:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 6, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 6, 11:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 23, 3:35 AM CDT | Heat Advisory | LSX | 39 hr |
| Aug 30, 4:15 PM CDT | Heat Advisory | LSX | 4 days |
| Oct 1, 2:25 PM CDT | Frost Advisory | LSX | 18 hr |
| Oct 20, 3:48 AM CDT | Freeze Warning | LSX | 29 hr |
| Oct 25, 6:56 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 27, 3:55 AM CDT | Frost Advisory | LSX | 28 hr |
| Oct 28, 3:59 PM CDT | Freeze Warning | LSX | 16 hr |
| Nov 18, 4:29 AM CST | Red Flag Warning | LSX | 13 hr |
| Dec 20, 10:59 PM CST | Dense Fog Advisory | LSX | 7 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 | 16 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 13 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 40 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 6 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 3 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.