Alert archive / Missouri / Shelby County
Weather alerts in Shelby County, Missouri, 2017
86 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 86
- Warnings
- 29
- Watches
- 14
- Advisories
- 20
- Busiest month
- June20 alerts
- Busiest day
- March 7, 20176 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 2 tornado warnings covering Shelby County in 2017 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 14 minutes after it went out.
Shelby County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 2 | 100% | 14 min |
| Severe thunderstorm warnings | 11 | 7 | 36% | 3 | 100% | 22 min |
| Flash flood warnings | 4 | 3 | 25% | 3 | 100% | 128 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 22 | 9 | 59% | 26 | 54% | 11 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 204 | 130 | 36% | 487 | 82% | 22 min |
| NWS St. Louis, MO: flash flood warnings | 20 | 9 | 55% | 33 | 97% | 302 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 2, 5:43 PM CST | Dense Fog Advisory | LSX | 13 hr |
| Jan 4, 3:24 AM CST | Winter Weather Advisory | LSX | 33 hr |
| Jan 10, 3:31 AM CST | Wind Advisory | LSX | 14 hr |
| Jan 11, 3:31 AM CST | Winter Storm Watch | LSX | 34 hr |
| Jan 12, 1:49 PM CST | Ice Storm Warning | LSX | 70 hr |
| Jan 15, 12:03 PM CST | Freezing Rain Advisory | LSX | 6 hr |
| Jan 15, 10:41 PM CST | Dense Fog Advisory | LSX | 13 hr |
| Jan 16, 3:33 PM CST | Dense Fog Advisory | LSX | 7 hr |
| Jan 19, 3:37 PM CST | Dense Fog Advisory | LSX | 20 hr |
| Feb 16, 3:37 AM CST | Red Flag Warning | LSX | 14 hr |
| Feb 21, 10:42 PM CST | Dense Fog Advisory | LSX | 10 hr |
| Feb 28, 12:50 PM CST | Wind Advisory | LSX | 5 hr |
| Feb 28, 2:57 PM CST | Tornado Watch | SPC | 7 hr |
| Feb 28, 6:05 PM CST | Mesoscale Discussion | SPC | 115 min |
| Feb 28, 7:57 PM CST | Severe Thunderstorm Warning | LSX | 48 min |
| Mar 3, 2:06 PM CST | Fire Weather Watch | LSX | 14 hr |
| Mar 6, 3:35 AM CST | Wind Advisory | LSX | 14 hr |
| Mar 6, 3:33 PM CST | Fire Weather Watch | LSX | 12 hr |
| Mar 6, 8:22 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 6, 8:52 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 6, 9:33 PM CST | Severe Thunderstorm Warning | LSX | 57 min |
| Mar 6, 9:42 PM CST | Tornado Warning | LSX | 28 min |
| Mar 6, 10:02 PM CST | Tornado Warning | LSX | 28 min |
| Mar 7, 4:00 AM CST | Red Flag Warning | LSX | 15 hr |
| Mar 8, 3:30 AM CST | Red Flag Warning | LSX | 15 hr |
| Mar 9, 3:35 PM CST | Freeze Warning | LSX | 68 hr |
| Mar 13, 2:04 PM CDT | Freeze Warning | LSX | 68 hr |
| Apr 10, 1:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 3:57 AM CDT | Special Weather Statement | LSX | 48 min |
| Apr 30, 11:00 PM CDT | Areal Flood Warning | LSX | 12 hr |
| May 1, 10:58 AM CDT | Areal Flood Warning | LSX | 24 hr |
| May 10, 3:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 17, 3:20 AM CDT | Wind Advisory | LSX | 16 hr |
| Jun 14, 1:04 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 14, 2:52 PM CDT | Special Weather Statement | LSX | 38 min |
| Jun 14, 5:15 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Jun 14, 5:59 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Jun 14, 6:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 14, 6:28 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jun 14, 9:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 15, 12:26 AM CDT | Flash Flood Warning | LSX | 8 hr |
| Jun 16, 12:45 AM CDT | Special Weather Statement | LSX | 45 min |
| Jun 16, 1:06 AM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Jun 16, 11:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 11:36 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 17, 1:29 AM CDT | Special Weather Statement | LSX | 46 min |
| Jun 17, 5:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 8:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 17, 10:29 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Jun 17, 10:48 PM CDT | Severe Thunderstorm Warning | LSX | 30 min |
| Jun 28, 9:41 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Jun 28, 10:24 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Jun 30, 12:21 AM CDT | Areal Flood Advisory | LSX | 9 hr |
| Jul 5, 5:57 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 10, 4:04 AM CDT | Heat Advisory | LSX | 4 days |
| Jul 15, 2:30 PM CDT | Excessive Heat Watch | LSX | 3 days |
| Jul 16, 2:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 17, 3:00 PM CDT | Excessive Heat Warning | LSX | 6 days |
| Jul 22, 5:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 9:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 22, 11:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 23, 12:38 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 23, 1:08 AM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Jul 26, 3:55 AM CDT | Flash Flood Watch | LSX | 19 hr |
| Aug 16, 12:42 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 18, 5:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 22, 12:47 AM CDT | Flash Flood Warning | LSX | 8 hr |
| Aug 28, 3:47 AM CDT | Dense Fog Advisory | LSX | 7 hr |
| Sep 18, 11:19 PM CDT | Dense Fog Advisory | LSX | 11 hr |
| Oct 14, 3:35 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 14, 5:09 PM CDT | Tornado Watch | SPC | 8 hr |
| Oct 14, 6:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Oct 14, 8:15 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Oct 27, 3:34 AM CDT | Freeze Watch | LSX | 12 hr |
| Oct 27, 3:09 PM CDT | Freeze Warning | LSX | 17 hr |
| Oct 27, 3:09 PM CDT | Freeze Warning | LSX | 42 hr |
| Nov 17, 3:35 PM CST | Wind Advisory | LSX | 26 hr |
| Nov 18, 5:29 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 4, 1:26 PM CST | Mesoscale Discussion | SPC | 94 min |
| Dec 4, 2:34 PM CST | Severe Thunderstorm Watch | SPC | 5 hr |
| Dec 4, 3:57 PM CST | Mesoscale Discussion | SPC | 93 min |
| Dec 23, 4:10 AM CST | Winter Weather Advisory | LSX | 34 hr |
| Dec 26, 3:50 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Dec 29, 3:39 AM CST | Winter Weather Advisory | LSX | 23 hr |
| Dec 29, 3:10 PM CST | Wind Chill Advisory | LSX | 4 days |
| Dec 30, 3:56 AM CST | Wind Chill Warning | LSX | 3 days |
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 archive20162018
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.