Alert archive / Missouri / Madison County
Weather alerts in Madison County, Missouri, 2020
77 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Madison County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 77
- Warnings
- 9
- Watches
- 21
- Advisories
- 23
- Busiest month
- March16 alerts
- Busiest day
- January 11, 20203 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Madison County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 3 | 25% | 1 | 100% | 2 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 10 | 2 | 80% | 12 | 17% | 5 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 157 | 69 | 56% | 280 | 79% | 24 min |
| NWS St. Louis, MO: flash flood warnings | 64 | 34 | 47% | 88 | 86% | 74 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, 4:15 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Jan 8, 2:31 PM CST | Flash Flood Watch | LSX | 61 hr |
| Jan 10, 10:40 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 11, 2:28 AM CST | Areal Flood Advisory | LSX | 11 hr |
| Jan 11, 1:43 PM CST | Areal Flood Warning | LSX | 22 hr |
| Jan 14, 8:20 PM CST | Dense Fog Advisory | LSX | 7 hr |
| Jan 16, 2:57 PM CST | Flood Watch | LSX | 39 hr |
| Jan 16, 2:57 PM CST | Winter Weather Advisory | LSX | 33 hr |
| Jan 21, 3:15 PM CST | Winter Weather Advisory | LSX | 3 days |
| Jan 28, 3:26 AM CST | Winter Weather Advisory | LSX | 34 hr |
| Feb 4, 2:46 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 24, 12:20 PM CST | Mesoscale Discussion | SPC | 115 min |
| Mar 2, 3:54 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 2, 6:39 PM CST | Mesoscale Discussion | SPC | 96 min |
| Mar 2, 6:51 PM CST | Severe Thunderstorm Warning | LSX | 39 min |
| Mar 2, 7:22 PM CST | Severe Thunderstorm Warning | LSX | 38 min |
| Mar 12, 6:05 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Mar 12, 2:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Mar 12, 3:44 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 19, 3:43 AM CDT | Flash Flood Watch | LSX | 21 hr |
| Mar 19, 11:05 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 19, 3:40 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Mar 27, 5:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Mar 27, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Mar 27, 6:56 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Mar 27, 8:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 28, 1:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 28, 3:53 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 8, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 8, 4:24 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 12, 3:15 AM CDT | Wind Advisory | LSX | 31 hr |
| Apr 14, 3:21 PM CDT | Freeze Warning | LSX | 18 hr |
| Apr 15, 3:41 PM CDT | Frost Advisory | LSX | 16 hr |
| Apr 17, 11:46 AM CDT | Frost Advisory | LSX | 20 hr |
| Apr 24, 3:06 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| 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, 6:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 28, 9:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 28, 9:42 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| May 3, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 3, 12:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 4, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 8, 3:32 AM CDT | Frost Advisory | LSX | 28 hr |
| May 10, 2:43 PM CDT | Frost Advisory | LSX | 17 hr |
| May 16, 8:58 PM CDT | Flash Flood Watch | LSX | 21 hr |
| Jun 7, 2:26 PM CDT | Flash Flood Watch | LSX | 48 hr |
| Jun 29, 3:09 AM CDT | Flash Flood Watch | LSX | 58 hr |
| Jul 15, 2:10 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 17, 1:59 AM CDT | Heat Advisory | LSX | 65 hr |
| Jul 17, 2:46 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 20, 12:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 11:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 2:35 PM CDT | Flash Flood Watch | LSX | 33 hr |
| Jul 31, 3:25 AM CDT | Flash Flood Watch | LSX | 21 hr |
| Aug 8, 2:18 PM CDT | Flash Flood Watch | LSX | 20 hr |
| Aug 9, 1:54 PM CDT | Heat Advisory | LSX | 29 hr |
| Aug 9, 5:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 10, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 7:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 11, 2:53 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 12, 7:03 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 13, 9:49 AM CDT | Flash Flood Watch | LSX | 9 hr |
| Aug 15, 2:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 11:56 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 31, 10:50 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Aug 31, 12:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Sep 3, 3:15 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| Oct 4, 3:08 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 15, 3:35 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 15, 2:08 PM CDT | Freeze Warning | LSX | 19 hr |
| Oct 16, 4:45 AM CDT | Fire Weather Watch | LSX | 10 hr |
| Oct 16, 2:34 PM CDT | Red Flag Warning | LSX | 27 hr |
| Oct 28, 3:01 PM CDT | Flood Watch | LSX | 19 hr |
| Nov 14, 10:32 PM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 19, 3:25 AM CST | Red Flag Warning | LSX | 14 hr |
| Dec 13, 2:55 AM CST | Winter Weather Advisory | LSX | 17 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 | 4 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 24 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 9 |
| Flood Watch | 2 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Weather Advisory | 5 |
| Heat | |
| Heat Advisory | 2 |
| 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 | 5 |
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.