Alert archive / Missouri / Shannon County
Weather alerts in Shannon County, Missouri, 2020
150 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Shannon County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 150
- Warnings
- 47
- Watches
- 22
- Advisories
- 43
- Busiest month
- May33 alerts
- Busiest day
- May 4, 20208 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 1 tornado warnings covering Shannon County in 2020 had a tornado report inside them.
Shannon County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 19 | 11 | 42% | 11 | 91% | 17 min |
| Flash flood warnings | 4 | 3 | 25% | 3 | 100% | 238 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Springfield, MO: tornado warnings | 27 | 1 | 96% | 4 | 50% | 5 min |
| NWS Springfield, MO: severe thunderstorm warnings | 281 | 167 | 41% | 499 | 88% | 21 min |
| NWS Springfield, MO: flash flood warnings | 58 | 41 | 29% | 171 | 88% | 207 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, 4:33 AM CST | Dense Fog Advisory | SGF | 4 hr |
| Jan 8, 2:15 PM CST | Flash Flood Watch | SGF | 62 hr |
| Jan 10, 10:16 AM CST | River Flood Warning | SGF | 52 hr |
| Jan 10, 10:16 AM CST | River Flood Warning | SGF | 62 hr |
| Jan 10, 4:55 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 5:34 PM CST | Tornado Watch | SPC | 11 hr |
| Jan 10, 7:30 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 10, 10:24 PM CST | Flash Flood Warning | SGF | 12 hr |
| Jan 10, 10:38 PM CST | Severe Thunderstorm Warning | SGF | 37 min |
| Jan 10, 10:40 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 11, 10:07 AM CST | Areal Flood Warning | SGF | 24 hr |
| Jan 12, 9:50 AM CST | Areal Flood Advisory | SGF | 24 hr |
| Jan 13, 7:05 AM CST | Dense Fog Advisory | SGF | 6 hr |
| Jan 14, 2:27 AM CST | Dense Fog Advisory | SGF | 6 hr |
| Jan 14, 9:54 AM CST | Dense Fog Advisory | SGF | 66 min |
| Jan 16, 2:22 AM CST | Flood Watch | SGF | 52 hr |
| Jan 16, 3:03 AM CST | Winter Weather Advisory | SGF | 41 hr |
| Jan 18, 12:59 AM CST | Areal Flood Warning | SGF | 12 hr |
| Jan 18, 12:42 PM CST | Areal Flood Advisory | SGF | 10 hr |
| Jan 20, 2:27 PM CST | Winter Weather Advisory | SGF | 4 hr |
| Jan 21, 2:55 PM CST | Winter Weather Advisory | SGF | 21 hr |
| Jan 22, 12:18 PM CST | Winter Weather Advisory | SGF | 24 hr |
| Jan 23, 3:17 AM CST | Winter Weather Advisory | SGF | 36 hr |
| Jan 23, 12:09 PM CST | Winter Weather Advisory | SGF | 6 hr |
| Jan 26, 8:47 PM CST | Dense Fog Advisory | SGF | 13 hr |
| Jan 28, 3:09 AM CST | Winter Weather Advisory | SGF | 33 hr |
| Feb 4, 3:51 AM CST | Winter Weather Advisory | SGF | 53 hr |
| Feb 4, 7:31 AM CST | Areal Flood Warning | SGF | 12 hr |
| Feb 11, 6:04 PM CST | Flood Watch | SGF | 30 hr |
| Feb 22, 2:54 AM CST | Flood Watch | SGF | 63 hr |
| Feb 24, 12:20 PM CST | Mesoscale Discussion | SPC | 115 min |
| Mar 1, 10:16 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 2, 3:54 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 2, 5:21 PM CST | Tornado Watch | SPC | 8 hr |
| Mar 2, 5:46 PM CST | Severe Thunderstorm Warning | SGF | 44 min |
| Mar 2, 5:56 PM CST | Severe Thunderstorm Warning | SGF | 46 min |
| Mar 2, 6:31 PM CST | Severe Thunderstorm Warning | SGF | 17 min |
| Mar 2, 6:39 PM CST | Mesoscale Discussion | SPC | 96 min |
| Mar 2, 6:53 PM CST | Special Weather Statement | SGF | 52 min |
| Mar 11, 9:43 PM CDT | Dense Fog Advisory | SGF | 12 hr |
| Mar 12, 2:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Mar 12, 3:44 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 12, 3:57 PM CDT | Special Weather Statement | SGF | 33 min |
| Mar 12, 4:09 PM CDT | Severe Thunderstorm Warning | SGF | 24 min |
| Mar 14, 11:17 AM CDT | Areal Flood Advisory | SGF | 12 hr |
| Mar 14, 11:15 PM CDT | Areal Flood Advisory | SGF | 11 hr |
| Mar 15, 10:13 AM CDT | Areal Flood Advisory | SGF | 6 hr |
| Mar 17, 4:34 AM CDT | Areal Flood Advisory | SGF | 6 hr |
| Mar 18, 2:24 PM CDT | Flash Flood Watch | SGF | 29 hr |
| Mar 19, 11:05 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 19, 1:10 PM CDT | Special Weather Statement | SGF | 50 min |
| Mar 19, 1:54 PM CDT | Areal Flood Warning | SGF | 6 hr |
| Mar 19, 8:40 PM CDT | River Flood Warning | SGF | 33 hr |
| Mar 19, 8:50 PM CDT | Areal Flood Warning | SGF | 14 hr |
| Mar 19, 9:18 PM CDT | River Flood Warning | SGF | 43 hr |
| Mar 20, 11:14 AM CDT | Areal Flood Advisory | SGF | 48 hr |
| Mar 27, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 27, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 27, 5:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 27, 6:02 PM CDT | Severe Thunderstorm Warning | SGF | 44 min |
| Mar 28, 1:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 8, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 8, 4:24 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 12, 3:57 AM CDT | Wind Advisory | SGF | 27 hr |
| Apr 14, 2:11 PM CDT | Freeze Warning | SGF | 18 hr |
| Apr 15, 1:51 PM CDT | Frost Advisory | SGF | 18 hr |
| Apr 17, 10:54 AM CDT | Frost Advisory | SGF | 22 hr |
| Apr 20, 2:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 20, 7:58 PM CDT | Severe Thunderstorm Warning | SGF | 47 min |
| Apr 28, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 6:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Apr 28, 8:47 PM CDT | Severe Thunderstorm Warning | SGF | 58 min |
| Apr 28, 9:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 3, 8:34 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 3, 10:34 AM CDT | Mesoscale Discussion | SPC | 86 min |
| May 3, 11:55 AM CDT | Severe Thunderstorm Warning | SGF | 50 min |
| May 4, 6:33 AM CDT | Severe Thunderstorm Watch | SPC | 12 hr |
| May 4, 10:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| May 4, 1:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 4, 2:14 PM CDT | Severe Thunderstorm Warning | SGF | 16 min |
| May 4, 2:28 PM CDT | Severe Thunderstorm Warning | SGF | 47 min |
| May 4, 3:18 PM CDT | Severe Thunderstorm Warning | SGF | 57 min |
| May 4, 3:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| May 4, 5:43 PM CDT | Areal Flood Advisory | SGF | 4 hr |
| May 4, 9:45 PM CDT | Areal Flood Advisory | SGF | 12 hr |
| May 4, 9:48 PM CDT | River Flood Warning | SGF | 24 hr |
| May 5, 8:04 AM CDT | River Flood Warning | SGF | 25 hr |
| May 8, 3:51 AM CDT | Frost Advisory | SGF | 27 hr |
| May 10, 1:44 PM CDT | Frost Advisory | SGF | 17 hr |
| May 13, 3:19 PM CDT | River Flood Warning | SGF | 7 hr |
| May 14, 9:34 PM CDT | Special Weather Statement | SGF | 56 min |
| May 14, 9:58 PM CDT | Flash Flood Warning | SGF | 6 hr |
| May 14, 10:41 PM CDT | Flash Flood Warning | SGF | 6 hr |
| May 14, 11:01 PM CDT | Severe Thunderstorm Warning | SGF | 59 min |
| May 14, 11:15 PM CDT | River Flood Warning | SGF | 10 hr |
| May 15, 4:06 AM CDT | Areal Flood Warning | SGF | 12 hr |
| May 16, 1:19 AM CDT | Areal Flood Warning | SGF | 10 hr |
| May 16, 8:21 PM CDT | Flash Flood Watch | SGF | 15 hr |
| May 17, 3:19 AM CDT | Areal Flood Advisory | SGF | 9 hr |
| May 17, 12:12 PM CDT | Areal Flood Advisory | SGF | 23 hr |
| May 17, 2:32 PM CDT | River Flood Warning | SGF | 10 hr |
| May 17, 7:56 PM CDT | River Flood Warning | SGF | 5 hr |
| May 18, 12:38 AM CDT | Areal Flood Warning | SGF | 12 hr |
| May 18, 12:32 PM CDT | Areal Flood Advisory | SGF | 6 hr |
| May 25, 2:22 AM CDT | Special Weather Statement | SGF | 38 min |
| May 25, 2:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 3, 4:08 PM CDT | Special Weather Statement | SGF | 52 min |
| Jun 5, 3:41 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 7, 3:25 AM CDT | Flash Flood Watch | SGF | 55 hr |
| Jun 8, 12:09 PM CDT | River Flood Warning | SGF | 41 hr |
| Jul 1, 9:55 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 15, 8:49 PM CDT | Special Weather Statement | SGF | 41 min |
| Jul 16, 9:07 PM CDT | Special Weather Statement | SGF | 38 min |
| Jul 17, 3:30 AM CDT | Heat Advisory | SGF | 65 hr |
| Jul 17, 12:02 PM CDT | Areal Flood Advisory | SGF | 6 hr |
| Jul 20, 3:45 PM CDT | Severe Thunderstorm Warning | SGF | 15 min |
| Jul 22, 11:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 2:47 PM CDT | Flash Flood Watch | SGF | 29 hr |
| Jul 31, 3:08 AM CDT | Flash Flood Watch | SGF | 17 hr |
| Jul 31, 3:02 PM CDT | Areal Flood Advisory | SGF | 6 hr |
| Jul 31, 4:39 PM CDT | Flash Flood Warning | SGF | 6 hr |
| Aug 9, 5:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 10, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 2:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 11:56 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 29, 1:00 PM CDT | Special Weather Statement | SGF | 75 min |
| Aug 31, 8:41 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 31, 12:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 31, 1:00 PM CDT | Special Weather Statement | SGF | 45 min |
| Sep 3, 12:40 AM CDT | Dense Fog Advisory | SGF | 8 hr |
| Sep 24, 9:34 PM CDT | Dense Fog Advisory | SGF | 12 hr |
| Oct 4, 2:18 AM CDT | Frost Advisory | SGF | 30 hr |
| Oct 15, 2:26 AM CDT | Frost Advisory | SGF | 31 hr |
| Oct 15, 2:06 PM CDT | Freeze Warning | SGF | 19 hr |
| Oct 16, 3:24 AM CDT | Fire Weather Watch | PAH | 12 hr |
| Oct 16, 3:25 PM CDT | Red Flag Warning | PAH | 28 hr |
| Oct 20, 4:58 PM CDT | Dense Fog Advisory | SGF | 17 hr |
| Oct 27, 1:58 PM CDT | Flood Watch | SGF | 47 hr |
| Nov 14, 5:14 PM CST | Tornado Watch | SPC | 8 hr |
| Nov 14, 8:38 PM CST | Severe Thunderstorm Warning | SGF | 67 min |
| Nov 14, 8:58 PM CST | Severe Thunderstorm Warning | SGF | 62 min |
| Nov 14, 8:58 PM CST | Severe Thunderstorm Warning | SGF | 31 min |
| Nov 14, 9:58 PM CST | Severe Thunderstorm Warning | SGF | 35 min |
| Nov 14, 10:19 PM CST | Tornado Warning | SGF | 26 min |
| Nov 14, 10:32 PM CST | Severe Thunderstorm Warning | SGF | 43 min |
| Nov 19, 3:07 AM CST | Red Flag Warning | PAH | 15 hr |
| Nov 22, 11:33 PM CST | Dense Fog Advisory | SGF | 11 hr |
| Dec 11, 10:21 PM CST | Areal Flood Advisory | SGF | 9 hr |
| Dec 12, 3:03 PM CST | Winter Weather Advisory | SGF | 30 hr |
| Dec 19, 9:37 PM CST | Dense Fog Advisory | SGF | 11 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 | 19 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 8 |
| Flash Flood Warning | 4 |
| River Flood Warning | 11 |
| Flash Flood Watch | 6 |
| Flood Watch | 4 |
| Areal Flood Advisory | 15 |
| Winter | |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.