Alert archive / Missouri / Washington County
Weather alerts in Washington County, Missouri, 2010
150 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 150
- Warnings
- 39
- Watches
- 40
- Advisories
- 31
- Busiest month
- July27 alerts
- Busiest day
- November 25, 20108 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 10 tornado warnings covering Washington County in 2010 had a tornado report inside them.
Washington County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 10 | 3 | 70% | 0 | ||
| Severe thunderstorm warnings | 15 | 5 | 67% | 2 | 50% | 29 min |
| Flash flood warnings | 6 | 1 | 83% | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 94 | 16 | 83% | 43 | 84% | 33 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 301 | 122 | 59% | 404 | 62% | 23 min |
| NWS St. Louis, MO: flash flood warnings | 112 | 44 | 61% | 122 | 73% | 122 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 5, 3:50 PM CST | Winter Storm Watch | LSX | 12 hr |
| Jan 6, 4:16 AM CST | Winter Weather Advisory | LSX | 37 hr |
| Jan 7, 4:16 AM CST | Wind Chill Advisory | LSX | 24 hr |
| Jan 7, 3:54 PM CST | Wind Chill Advisory | LSX | 43 hr |
| Jan 15, 3:42 PM CST | Dense Fog Advisory | LSX | 20 hr |
| Jan 15, 3:42 PM CST | Freezing Fog Advisory | LSX | 20 hr |
| Jan 16, 2:33 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 17, 2:12 PM CST | Dense Fog Advisory | LSX | 22 hr |
| Jan 18, 3:00 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 20, 3:55 PM CST | Dense Fog Advisory | LSX | 17 hr |
| Jan 28, 3:24 AM CST | Winter Weather Advisory | LSX | 49 hr |
| Feb 4, 4:08 AM CST | Winter Weather Advisory | LSX | 44 hr |
| Feb 6, 4:18 AM CST | Winter Storm Watch | LSX | 36 hr |
| Feb 7, 3:55 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 12, 3:29 PM CST | Winter Weather Advisory | LSX | 63 hr |
| Mar 10, 7:48 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 10, 11:08 PM CST | Mesoscale Discussion | SPC | 97 min |
| Mar 22, 1:11 AM CDT | Flash Flood Warning | LSX | 10 hr |
| Mar 30, 2:47 PM CDT | Fire Weather Watch | LSX | 20 hr |
| Mar 31, 10:23 AM CDT | Red Flag Warning | LSX | 8 hr |
| Apr 4, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 4, 11:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Apr 5, 1:56 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Apr 5, 12:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Apr 8, 4:16 AM CDT | Frost Advisory | LSX | 29 hr |
| Apr 17, 3:34 PM CDT | Frost Advisory | LSX | 16 hr |
| Apr 24, 11:08 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 24, 11:31 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 24, 2:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 24, 3:07 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Apr 24, 3:31 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Apr 24, 5:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 30, 2:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 30, 2:40 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 30, 6:55 PM CDT | Tornado Warning | LSX | 50 min |
| Apr 30, 7:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 30, 7:40 PM CDT | Tornado Warning | LSX | 50 min |
| Apr 30, 7:55 PM CDT | Tornado Warning | LSX | 50 min |
| Apr 30, 8:14 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Apr 30, 8:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 30, 9:03 PM CDT | Tornado Watch | SPC | 6 hr |
| May 1, 3:54 AM CDT | Flash Flood Watch | LSX | 23 hr |
| May 1, 10:14 PM CDT | Tornado Watch | SPC | 7 hr |
| May 3, 12:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 3, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 3, 5:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 12, 4:03 AM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| May 12, 4:38 AM CDT | Flash Flood Warning | LSX | 5 hr |
| May 13, 5:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 15, 3:58 AM CDT | Flash Flood Watch | LSX | 9 hr |
| May 18, 3:08 PM CDT | Flash Flood Watch | LSX | 60 hr |
| May 20, 9:19 AM CDT | River Flood Warning | LSX | 24 hr |
| Jun 2, 7:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 2, 8:53 PM CDT | Severe Thunderstorm Warning | LSX | 67 min |
| Jun 8, 10:20 PM CDT | Severe Thunderstorm Warning | LSX | 37 min |
| Jun 8, 10:50 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jun 11, 4:01 AM CDT | Flash Flood Watch | LSX | 12 hr |
| Jun 13, 11:55 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 13, 12:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 11:55 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 15, 12:27 PM CDT | Severe Thunderstorm Warning | LSX | 28 min |
| Jun 15, 12:29 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 17, 6:02 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Jun 18, 4:14 AM CDT | Heat Advisory | LSX | 6 days |
| Jun 19, 2:33 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 19, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 27, 7:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 11, 9:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 11, 10:07 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 12:17 PM CDT | Tornado Watch | SPC | 3 hr |
| Jul 11, 2:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 11, 3:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 11, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 3:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 12, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 7:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jul 13, 2:35 PM CDT | Heat Advisory | LSX | 52 hr |
| Jul 16, 4:06 PM CDT | Heat Advisory | LSX | 38 hr |
| Jul 18, 6:22 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 18, 8:47 AM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| Jul 18, 9:14 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 19, 5:18 AM CDT | Severe Thunderstorm Warning | LSX | 42 min |
| Jul 19, 10:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 19, 10:38 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 5:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 20, 5:08 AM CDT | Flash Flood Watch | LSX | 22 hr |
| Jul 20, 7:33 AM CDT | Mesoscale Discussion | SPC | 27 min |
| Jul 20, 7:36 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 20, 10:59 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 20, 8:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 21, 3:39 PM CDT | Heat Advisory | LSX | 3 days |
| Jul 30, 1:49 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 30, 5:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 30, 6:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Aug 1, 3:13 PM CDT | Heat Advisory | LSX | 3 days |
| Aug 3, 4:43 AM CDT | Excessive Heat Warning | LSX | 39 hr |
| Aug 6, 2:56 PM CDT | Excessive Heat Watch | LSX | 49 hr |
| Aug 8, 3:55 AM CDT | Excessive Heat Warning | LSX | 7 days |
| Aug 10, 4:41 PM CDT | Severe Thunderstorm Warning | LSX | 31 min |
| Aug 12, 4:15 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Aug 12, 4:41 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Aug 12, 5:28 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Sep 2, 4:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 2, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 2, 7:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 8:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Sep 8, 3:48 PM CDT | Flash Flood Watch | LSX | 27 hr |
| Sep 9, 9:18 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| Oct 3, 3:48 PM CDT | Frost Advisory | LSX | 16 hr |
| Oct 4, 4:16 AM CDT | Frost Advisory | LSX | 28 hr |
| Oct 24, 3:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 25, 9:36 PM CDT | Mesoscale Discussion | SPC | 24 min |
| Oct 25, 10:03 PM CDT | Tornado Watch | SPC | 9 hr |
| Oct 26, 2:21 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Oct 26, 2:53 AM CDT | Severe Thunderstorm Warning | LSX | 52 min |
| Oct 26, 3:31 AM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Oct 26, 4:12 AM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| Oct 26, 7:30 PM CDT | Fire Weather Watch | LSX | 9 hr |
| Oct 27, 4:47 AM CDT | Red Flag Warning | LSX | 12 hr |
| Oct 27, 3:53 PM CDT | Freeze Watch | LSX | 12 hr |
| Oct 28, 3:47 AM CDT | Freeze Warning | LSX | 29 hr |
| Oct 29, 2:43 AM CDT | Fire Weather Watch | LSX | 13 hr |
| Oct 29, 3:58 PM CDT | Red Flag Warning | LSX | 26 hr |
| Nov 6, 3:47 PM CDT | Fire Weather Watch | LSX | 25 hr |
| Nov 7, 3:57 PM CST | Red Flag Warning | LSX | 26 hr |
| Nov 22, 4:50 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 22, 7:31 PM CST | Mesoscale Discussion | SPC | 89 min |
| Nov 22, 7:49 PM CST | Severe Thunderstorm Warning | LSX | 56 min |
| Nov 24, 3:48 PM CST | Flash Flood Watch | LSX | 12 hr |
| Nov 24, 6:42 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 24, 8:23 PM CST | Tornado Watch | SPC | 8 hr |
| Nov 24, 9:26 PM CST | Areal Flood Advisory | LSX | 6 hr |
| Nov 24, 9:39 PM CST | Tornado Warning | LSX | 51 min |
| Nov 24, 10:25 PM CST | Tornado Warning | LSX | 50 min |
| Nov 24, 10:31 PM CST | Tornado Warning | LSX | 44 min |
| Nov 24, 11:03 PM CST | Tornado Warning | LSX | 42 min |
| Nov 25, 3:31 AM CST | Areal Flood Advisory | LSX | 6 hr |
| Dec 11, 4:15 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 11, 4:09 PM CST | Wind Advisory | LSX | 29 hr |
| Dec 12, 4:19 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Dec 15, 4:00 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 23, 12:07 PM CST | Winter Weather Advisory | LSX | 40 hr |
| Dec 31, 12:44 AM CST | Mesoscale Discussion | SPC | 61 min |
| Dec 31, 2:25 AM CST | Severe Thunderstorm Watch | SPC | 2 hr |
| Dec 31, 5:45 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | 8 hr |
| Dec 31, 10:13 AM CST | Tornado Warning | LSX | 62 min |
| Dec 31, 10:56 AM CST | Tornado Warning | LSX | 64 min |
| Dec 31, 11:22 AM CST | Tornado Warning | LSX | 53 min |
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 | 15 |
| Tornado Warning | 10 |
| Severe Thunderstorm Watch | 15 |
| Tornado Watch | 10 |
| Mesoscale Discussion | 40 |
| Flooding | |
| Flash Flood Warning | 6 |
| River Flood Warning | 1 |
| Flash Flood Watch | 7 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 8 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 4 |
| Fire Weather Watch | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.