Alert archive / Missouri / Saint Louis County
Weather alerts in Saint Louis County, Missouri, 2016
119 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Saint Louis County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 119
- Warnings
- 48
- Watches
- 17
- Advisories
- 31
- Busiest month
- May26 alerts
- Busiest day
- May 11, 201611 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Saint Louis County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 29 | 25 | 14% | 65 | 86% | 27 min |
| Flash flood warnings | 3 | 1 | 67% | 1 | 100% | 253 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 11 | 4 | 64% | 15 | 40% | 5 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 172 | 111 | 35% | 643 | 86% | 27 min |
| NWS St. Louis, MO: flash flood warnings | 52 | 21 | 60% | 50 | 80% | 131 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, 3:55 AM CST | Winter Weather Advisory | LSX | 11 hr |
| Jan 17, 4:15 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Jan 18, 3:40 PM CST | Winter Weather Advisory | LSX | 36 hr |
| Feb 13, 4:11 AM CST | Winter Weather Advisory | LSX | 38 hr |
| Feb 15, 3:31 AM CST | Dense Fog Advisory | LSX | 8 hr |
| Feb 16, 3:45 AM CST | Winter Weather Advisory | LSX | 6 hr |
| Feb 20, 5:15 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 23, 2:25 PM CST | Winter Weather Advisory | LSX | 25 hr |
| Feb 23, 2:35 PM CST | Wind Advisory | LSX | 27 hr |
| Feb 24, 2:37 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 24, 3:20 AM CST | Winter Storm Warning | LSX | 15 hr |
| Feb 28, 4:10 AM CST | Wind Advisory | LSX | 14 hr |
| Mar 8, 1:34 PM CST | Flash Flood Watch | LSX | 36 hr |
| Mar 14, 1:02 AM CDT | Dense Fog Advisory | LSX | 9 hr |
| Mar 15, 5:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 16, 3:55 AM CDT | Red Flag Warning | LSX | 16 hr |
| Mar 19, 4:00 AM CDT | Freeze Watch | LSX | 24 hr |
| Mar 20, 4:00 AM CDT | Freeze Warning | LSX | 29 hr |
| Mar 22, 3:47 AM CDT | Red Flag Warning | LSX | 15 hr |
| Mar 27, 3:50 PM CDT | Frost Advisory | LSX | 17 hr |
| Mar 30, 1:12 PM CDT | Severe Thunderstorm Warning | LSX | 27 min |
| Mar 30, 1:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 2:23 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Mar 31, 12:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 1, 9:11 PM CDT | Wind Advisory | LSX | 21 hr |
| Apr 7, 3:29 AM CDT | Freeze Watch | LSX | 24 hr |
| Apr 8, 3:26 AM CDT | Freeze Warning | LSX | 30 hr |
| Apr 26, 10:03 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Apr 26, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 26, 1:29 PM CDT | Severe Thunderstorm Warning | LSX | 50 min |
| Apr 26, 1:38 PM CDT | Severe Thunderstorm Warning | LSX | 27 min |
| Apr 26, 2:00 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Apr 26, 2:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 5:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 27, 10:59 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Apr 30, 10:21 AM CDT | River Flood Warning | LSX | 3 days |
| Apr 30, 3:59 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 30, 6:37 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Apr 30, 6:41 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Apr 30, 6:48 PM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Apr 30, 7:02 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Apr 30, 7:25 PM CDT | Severe Thunderstorm Warning | LSX | 50 min |
| Apr 30, 7:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 30, 7:43 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| Apr 30, 8:31 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| May 7, 3:42 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 7, 4:24 PM CDT | Severe Thunderstorm Warning | LSX | 36 min |
| May 7, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 11, 3:19 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| May 11, 11:20 AM CDT | Mesoscale Discussion | SPC | 55 min |
| May 11, 12:10 PM CDT | Severe Thunderstorm Watch | SPC | 12 hr |
| May 11, 12:26 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| May 11, 12:47 PM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| May 11, 1:08 PM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| May 11, 1:12 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| May 11, 1:51 PM CDT | Severe Thunderstorm Warning | LSX | 54 min |
| May 11, 1:55 PM CDT | Severe Thunderstorm Warning | LSX | 65 min |
| May 11, 2:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 11, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 11, 7:19 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| May 11, 7:57 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| May 11, 8:15 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| May 12, 2:41 PM CDT | River Flood Warning | LSX | 4 days |
| May 14, 6:57 AM CDT | River Flood Warning | LSX | 43 hr |
| May 26, 6:41 AM CDT | Severe Thunderstorm Warning | LSX | 26 min |
| May 27, 9:30 AM CDT | River Flood Warning | LSX | 7 days |
| Jun 12, 5:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 3:33 AM CDT | Heat Advisory | LSX | 63 hr |
| Jun 21, 3:06 PM CDT | Heat Advisory | LSX | 30 hr |
| Jun 23, 4:04 AM CDT | Heat Advisory | LSX | 15 hr |
| Jun 25, 3:56 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Jun 26, 1:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 26, 4:47 PM CDT | Special Weather Statement | LSX | 28 min |
| Jun 30, 3:45 PM CDT | Flash Flood Watch | LSX | 4 days |
| Jul 5, 3:15 AM CDT | Dense Fog Advisory | LSX | 5 hr |
| Jul 6, 8:30 AM CDT | Special Weather Statement | LSX | 45 min |
| Jul 6, 9:15 AM CDT | Special Weather Statement | LSX | 45 min |
| Jul 7, 3:55 AM CDT | Dense Fog Advisory | LSX | 3 hr |
| Jul 7, 5:26 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 6:01 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 7, 7:59 AM CDT | Severe Thunderstorm Warning | LSX | 61 min |
| Jul 7, 8:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 13, 11:14 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 13, 2:06 PM CDT | Severe Thunderstorm Warning | LSX | 54 min |
| Jul 13, 2:58 PM CDT | Severe Thunderstorm Warning | LSX | 62 min |
| Jul 18, 3:54 AM CDT | Heat Advisory | LSX | 48 hr |
| Jul 18, 4:04 PM CDT | Excessive Heat Warning | LSX | 6 days |
| Jul 19, 2:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 5:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 19, 7:47 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Jul 19, 8:26 PM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Jul 25, 2:51 AM CDT | Areal Flood Advisory | LSX | 6 hr |
| Jul 31, 3:40 PM CDT | Excessive Heat Watch | LSX | 48 hr |
| Jul 31, 11:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Aug 1, 2:40 PM CDT | Flash Flood Watch | LSX | 21 hr |
| Aug 2, 3:05 PM CDT | Flash Flood Watch | LSX | 14 hr |
| Aug 10, 3:05 PM CDT | Heat Advisory | LSX | 29 hr |
| Aug 12, 3:44 AM CDT | Flash Flood Watch | LSX | 4 days |
| Aug 12, 7:37 PM CDT | Special Weather Statement | LSX | 38 min |
| Aug 14, 9:37 PM CDT | River Flood Warning | LSX | 6 days |
| Aug 14, 9:37 PM CDT | River Flood Warning | LSX | 6 days |
| Aug 14, 9:37 PM CDT | River Flood Warning | LSX | 6 days |
| Aug 15, 4:04 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Aug 15, 5:03 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Aug 15, 9:58 AM CDT | Areal Flood Warning | LSX | 3 hr |
| Aug 15, 11:01 AM CDT | Areal Flood Warning | LSX | 3 hr |
| Aug 15, 1:50 PM CDT | Areal Flood Warning | LSX | 3 hr |
| Aug 24, 9:53 PM CDT | Mesoscale Discussion | SPC | 37 min |
| Aug 31, 5:09 AM CDT | Dense Fog Advisory | LSX | 4 hr |
| Sep 5, 3:05 PM CDT | Heat Advisory | LSX | 51 hr |
| Sep 9, 3:58 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Sep 9, 4:00 AM CDT | Flash Flood Watch | LSX | 27 hr |
| Sep 9, 7:02 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Sep 10, 4:19 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Sep 16, 8:51 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Sep 19, 2:44 AM CDT | Dense Fog Advisory | LSX | 6 hr |
| Nov 3, 3:26 AM CDT | Areal Flood Advisory | LSX | 4 hr |
| Dec 16, 9:24 AM CST | Winter Weather Advisory | LSX | 39 hr |
| Dec 25, 5:33 PM CST | Dense Fog Advisory | LSX | 5 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 | 29 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 4 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 3 |
| River Flood Warning | 7 |
| Flash Flood Watch | 6 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.