Alert archive / Missouri / Jefferson County
Weather alerts in Jefferson County, Missouri, 2022
110 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 110
- Warnings
- 49
- Watches
- 11
- Advisories
- 28
- Busiest month
- May18 alerts
- Busiest day
- May 19, 20228 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 17 | 11 | 35% | 10 | 80% | 11 min |
| Flash flood warnings | 3 | 3 | 0% | 6 | 83% | 103 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 10 | 2 | 80% | 10 | 50% | 9 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 173 | 88 | 49% | 343 | 81% | 21 min |
| NWS St. Louis, MO: flash flood warnings | 40 | 20 | 50% | 95 | 91% | 130 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 7, 5:52 PM CST | Winter Weather Advisory | LSX | 27 hr |
| Jan 14, 2:58 AM CST | Winter Weather Advisory | LSX | 39 hr |
| Jan 31, 2:49 AM CST | Winter Storm Watch | LSX | 24 hr |
| Feb 1, 2:41 AM CST | Winter Storm Warning | LSX | 69 hr |
| Feb 2, 1:44 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 9:35 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 3, 2:03 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 15, 2:48 PM CST | Flood Watch | LSX | 48 hr |
| Feb 16, 1:38 PM CST | Winter Weather Advisory | LSX | 30 hr |
| Feb 17, 2:13 AM CST | Areal Flood Advisory | LSX | 6 hr |
| Feb 17, 6:00 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 17, 10:08 AM CST | River Flood Warning | LSX | 69 hr |
| Feb 19, 8:37 AM CST | River Flood Warning | LSX | 36 hr |
| Feb 20, 6:49 AM CST | River Flood Warning | LSX | 7 hr |
| Feb 22, 2:21 PM CST | Winter Storm Warning | LSX | 51 hr |
| Feb 22, 2:21 PM CST | Winter Weather Advisory | LSX | 58 hr |
| Feb 23, 2:09 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 6, 9:29 PM CST | Areal Flood Advisory | LSX | 4 hr |
| Mar 6, 9:47 PM CST | Areal Flood Advisory | LSX | 4 hr |
| Mar 9, 2:21 PM CST | Winter Weather Advisory | LSX | 52 hr |
| Mar 30, 9:03 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 30, 8:39 PM CDT | River Flood Warning | LSX | 61 hr |
| Mar 31, 2:37 PM CDT | Freeze Warning | LSX | 18 hr |
| Apr 1, 10:22 AM CDT | River Flood Warning | LSX | 68 hr |
| Apr 1, 10:22 AM CDT | River Flood Warning | LSX | 50 hr |
| Apr 1, 9:28 PM CDT | River Flood Warning | LSX | 58 hr |
| Apr 2, 8:49 AM CDT | River Flood Warning | LSX | 9 hr |
| Apr 5, 3:38 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 8, 3:35 AM CDT | Freeze Warning | LSX | 28 hr |
| Apr 11, 4:52 AM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Apr 11, 5:15 AM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| Apr 11, 5:31 AM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Apr 12, 1:17 AM CDT | Dense Fog Advisory | LSX | 8 hr |
| Apr 13, 10:49 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 13, 11:16 AM CDT | Tornado Watch | SPC | 5 hr |
| Apr 13, 2:34 PM CDT | Frost Advisory | LSX | 16 hr |
| Apr 17, 2:27 PM CDT | Freeze Watch | LSX | 13 hr |
| Apr 18, 3:12 AM CDT | Freeze Warning | LSX | 30 hr |
| Apr 30, 1:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 2:27 PM CDT | River Flood Warning | LSX | 6 days |
| May 5, 2:57 PM CDT | River Flood Warning | LSX | 6 days |
| May 5, 2:57 PM CDT | River Flood Warning | LSX | 4 days |
| May 6, 9:45 AM CDT | River Flood Warning | LSX | 42 hr |
| May 6, 10:45 AM CDT | River Flood Warning | LSX | 4 days |
| May 6, 10:45 AM CDT | River Flood Warning | LSX | 5 days |
| May 13, 5:22 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 2:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 19, 10:05 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 11:00 AM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| May 19, 12:17 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 12:51 PM CDT | Tornado Watch | SPC | 6 hr |
| May 19, 2:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 19, 3:44 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| May 19, 4:38 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| May 19, 5:06 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| May 21, 2:16 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| May 21, 4:17 PM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| Jun 3, 8:08 PM CDT | River Flood Warning | LSX | 24 hr |
| Jun 8, 4:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 11, 2:02 PM CDT | Heat Advisory | LSX | 31 hr |
| Jun 12, 2:52 PM CDT | Heat Advisory | LSX | 5 days |
| Jun 13, 2:58 AM CDT | Excessive Heat Warning | LSX | 4 days |
| Jun 17, 5:07 AM CDT | Severe Thunderstorm Warning | LSX | 68 min |
| Jun 17, 5:23 AM CDT | Severe Thunderstorm Warning | LSX | 37 min |
| Jun 17, 5:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 17, 5:45 AM CDT | Severe Thunderstorm Warning | LSX | 60 min |
| Jul 2, 11:26 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 3, 1:08 PM CDT | Heat Advisory | LSX | 72 hr |
| Jul 4, 2:39 PM CDT | Excessive Heat Warning | LSX | 4 days |
| Jul 8, 3:05 AM CDT | Heat Advisory | LSX | 17 hr |
| Jul 8, 4:31 PM CDT | Severe Thunderstorm Warning | LSX | 29 min |
| Jul 8, 4:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 4:49 PM CDT | Severe Thunderstorm Warning | LSX | 24 min |
| Jul 21, 2:02 PM CDT | Heat Advisory | LSX | 3 days |
| Jul 28, 12:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:14 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 28, 3:21 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Aug 1, 3:24 AM CDT | Heat Advisory | LSX | 64 hr |
| Aug 3, 1:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 3, 1:45 PM CDT | Flood Watch | LSX | 20 hr |
| Aug 3, 1:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 3, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 3, 4:49 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Aug 3, 5:16 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Aug 3, 11:12 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Aug 4, 12:53 AM CDT | Flash Flood Warning | LSX | 4 hr |
| Aug 4, 3:02 AM CDT | Areal Flood Warning | LSX | 6 hr |
| Aug 5, 2:51 AM CDT | Heat Advisory | LSX | 4 days |
| Aug 8, 9:58 AM CDT | Flood Watch | LSX | 18 hr |
| Aug 20, 10:39 PM CDT | Severe Thunderstorm Warning | LSX | 36 min |
| Aug 25, 8:06 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Aug 29, 1:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 7, 2:42 AM CDT | Frost Advisory | LSX | 30 hr |
| Oct 8, 2:54 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 12, 2:35 PM CDT | Red Flag Warning | LSX | 29 hr |
| Oct 13, 3:15 PM CDT | Red Flag Warning | LSX | 29 hr |
| Oct 16, 2:44 AM CDT | Freeze Watch | LSX | 12 hr |
| Oct 16, 2:23 PM CDT | Freeze Warning | LSX | 43 hr |
| Oct 17, 10:33 AM CDT | Red Flag Warning | LSX | 7 hr |
| Nov 3, 2:08 PM CDT | Wind Advisory | LSX | 45 hr |
| Nov 25, 6:33 PM CST | Dense Fog Advisory | LSX | 14 hr |
| Dec 1, 1:50 PM CST | Wind Advisory | LSX | 37 hr |
| Dec 6, 3:15 AM CST | Dense Fog Advisory | LSX | 7 hr |
| Dec 10, 8:07 PM CST | Dense Fog Advisory | LSX | 7 hr |
| Dec 19, 3:48 PM CST | Winter Storm Watch | LSX | 36 hr |
| Dec 20, 2:54 AM CST | Wind Chill Watch | LSX | 25 hr |
| Dec 21, 3:30 AM CST | Wind Chill Warning | LSX | 71 hr |
| Dec 21, 3:30 AM CST | Winter Storm Warning | LSX | 41 hr |
| Dec 22, 10:59 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 22, 2:55 PM CST | Wind Chill Advisory | LSX | 42 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 | 17 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 22 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 3 |
| River Flood Warning | 15 |
| Flood Watch | 3 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 2 |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 4 |
| Wind Chill Warning | 1 |
| Freeze Watch | 2 |
| Wind Chill Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
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.