Alert archive / Missouri / Lewis County
Weather alerts in Lewis County, Missouri, 2009
142 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lewis County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 142
- Warnings
- 55
- Watches
- 31
- Advisories
- 24
- Busiest month
- June27 alerts
- Busiest day
- May 14, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 2 tornado warnings covering Lewis County in 2009 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 40 minutes after it went out.
Lewis County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 2 | 0% | 2 | 100% | 40 min |
| Severe thunderstorm warnings | 8 | 3 | 63% | 6 | 67% | 25 min |
| Flash flood warnings | 7 | 6 | 14% | 7 | 100% | 180 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 62 | 12 | 81% | 30 | 80% | 19 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 214 | 84 | 61% | 316 | 59% | 20 min |
| NWS St. Louis, MO: flash flood warnings | 97 | 48 | 51% | 138 | 78% | 120 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, 6:07 PM CST | Dense Fog Advisory | LSX | 9 hr |
| Jan 12, 3:12 PM CST | Wind Advisory | LSX | 9 hr |
| Jan 14, 3:42 AM CST | Wind Chill Advisory | LSX | 39 hr |
| Jan 14, 4:02 PM CST | Wind Chill Warning | LSX | 20 hr |
| Jan 15, 9:29 PM CST | Wind Chill Advisory | LSX | 13 hr |
| Jan 24, 4:31 AM CST | Wind Chill Advisory | LSX | 5 hr |
| Feb 3, 2:27 AM CST | Wind Chill Advisory | LSX | 7 hr |
| Feb 26, 6:57 AM CST | Mesoscale Discussion | SPC | 93 min |
| Feb 26, 9:26 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 26, 5:19 PM CST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 5, 10:17 AM CST | Wind Advisory | LSX | 8 hr |
| Mar 7, 9:54 PM CST | Flash Flood Watch | LSX | 8 hr |
| Mar 7, 10:26 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 8, 6:32 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 8, 12:16 PM CDT | Wind Advisory | LSX | 7 hr |
| Mar 8, 2:14 PM CDT | River Flood Warning | LSX | 5 days |
| Mar 8, 2:14 PM CDT | River Flood Warning | LSX | 4 days |
| Mar 8, 10:16 PM CDT | River Flood Warning | LSX | 8 days |
| Mar 9, 4:25 AM CDT | Flash Flood Watch | LSX | 27 hr |
| Mar 23, 3:15 AM CDT | Wind Advisory | LSX | 17 hr |
| Mar 25, 12:55 PM CDT | River Flood Warning | LSX | 22 hr |
| Mar 26, 3:34 PM CDT | Winter Storm Watch | LSX | 36 hr |
| Mar 28, 3:31 AM CDT | Winter Storm Warning | LSX | 17 hr |
| Mar 28, 3:31 AM CDT | Winter Weather Advisory | LSX | 24 hr |
| Apr 25, 5:32 PM CDT | Mesoscale Discussion | SPC | 73 min |
| Apr 25, 9:23 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 29, 3:53 AM CDT | Flash Flood Watch | LSX | 36 hr |
| Apr 30, 1:10 AM CDT | Flash Flood Warning | LSX | 6 hr |
| Apr 30, 2:56 AM CDT | River Flood Warning | LSX | 9 hr |
| Apr 30, 6:59 AM CDT | Areal Flood Warning | LSX | 5 hr |
| Apr 30, 2:40 PM CDT | River Flood Warning | LSX | 5 days |
| Apr 30, 3:56 PM CDT | River Flood Warning | LSX | 41 hr |
| May 7, 5:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 7, 5:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 7, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 7, 6:49 PM CDT | Severe Thunderstorm Warning | LSX | 48 min |
| May 13, 9:27 AM CDT | Mesoscale Discussion | SPC | 63 min |
| May 13, 1:52 PM CDT | Mesoscale Discussion | SPC | 23 min |
| May 13, 2:39 PM CDT | Tornado Watch | SPC | 7 hr |
| May 13, 5:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 13, 6:39 PM CDT | Tornado Warning | LSX | 66 min |
| May 13, 7:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 13, 7:35 PM CDT | Tornado Warning | LSX | 55 min |
| May 13, 8:17 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 13, 8:34 PM CDT | Severe Thunderstorm Warning | LSX | 26 min |
| May 13, 8:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 14, 5:20 AM CDT | River Flood Warning | LSX | 6 days |
| May 14, 5:20 AM CDT | River Flood Warning | LSX | 5 days |
| May 14, 3:51 PM CDT | Flash Flood Watch | LSX | 32 hr |
| May 15, 11:25 AM CDT | Flash Flood Warning | LSX | 6 hr |
| May 15, 11:38 AM CDT | Severe Thunderstorm Warning | LSX | 25 min |
| May 15, 12:13 PM CDT | River Flood Warning | LSX | 4 days |
| May 15, 12:50 PM CDT | Tornado Watch | SPC | 7 hr |
| May 15, 3:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 15, 4:48 PM CDT | Flash Flood Warning | LSX | 6 hr |
| May 15, 10:31 PM CDT | Areal Flood Warning | LSX | 10 hr |
| May 16, 8:35 AM CDT | Areal Flood Warning | LSX | 6 hr |
| May 16, 2:36 PM CDT | Areal Flood Warning | LSX | 20 hr |
| Jun 2, 4:09 AM CDT | Flash Flood Watch | LSX | 16 hr |
| Jun 2, 12:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 2, 1:35 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Jun 2, 4:01 PM CDT | Flash Flood Warning | LSX | 3 hr |
| Jun 3, 6:12 PM CDT | River Flood Warning | LSX | 17 hr |
| Jun 7, 4:36 AM CDT | Severe Thunderstorm Warning | LSX | 24 min |
| Jun 7, 4:45 AM CDT | Mesoscale Discussion | SPC | 30 min |
| Jun 7, 5:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 7, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 3:25 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 9, 4:00 PM CDT | Flash Flood Watch | LSX | 12 hr |
| Jun 15, 3:42 PM CDT | Flash Flood Watch | LSX | 20 hr |
| Jun 15, 11:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 17, 3:09 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 18, 1:01 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 19, 10:57 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 3:22 PM CDT | Severe Thunderstorm Warning | LSX | 38 min |
| Jun 19, 5:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 21, 2:24 PM CDT | Heat Advisory | LSX | 6 days |
| Jun 23, 5:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 23, 5:52 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 23, 7:12 PM CDT | Severe Thunderstorm Warning | LSX | 63 min |
| Jun 25, 4:34 PM CDT | River Flood Warning | LSX | 17 hr |
| Jun 27, 5:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 5:54 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 7:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 9:15 PM CDT | Flash Flood Watch | LSX | 7 hr |
| Jul 9, 11:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 15, 12:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 24, 9:51 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 24, 11:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 3, 11:44 AM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Aug 3, 3:52 PM CDT | Flash Flood Watch | LSX | 17 hr |
| Aug 3, 4:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 4, 2:11 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 4:06 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 7, 4:18 AM CDT | Heat Advisory | LSX | 63 hr |
| Aug 17, 1:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 17, 1:57 AM CDT | Flash Flood Warning | LSX | 4 hr |
| Aug 17, 4:09 AM CDT | Flash Flood Watch | LSX | 11 hr |
| Aug 17, 2:16 PM CDT | Areal Flood Advisory | LSX | 5 hr |
| Aug 17, 3:10 PM CDT | River Flood Warning | LSX | 28 hr |
| Aug 18, 6:33 AM CDT | River Flood Warning | LSX | 25 hr |
| Aug 19, 11:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 19, 12:49 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 19, 3:20 PM CDT | Flash Flood Watch | LSX | 13 hr |
| Aug 28, 1:55 PM CDT | River Flood Warning | LSX | 46 hr |
| Sep 6, 9:04 PM CDT | Dense Fog Advisory | LSX | 12 hr |
| Sep 10, 8:50 PM CDT | Dense Fog Advisory | LSX | 12 hr |
| Sep 21, 4:07 AM CDT | Dense Fog Advisory | LSX | 5 hr |
| Sep 25, 2:39 AM CDT | Areal Flood Advisory | LSX | 6 hr |
| Sep 26, 7:53 AM CDT | River Flood Warning | LSX | 4 hr |
| Sep 26, 1:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Oct 9, 4:07 PM CDT | Frost Advisory | LSX | 16 hr |
| Oct 10, 3:55 AM CDT | Freeze Warning | LSX | 23 hr |
| Oct 17, 4:22 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 17, 3:31 PM CDT | Freeze Warning | LSX | 17 hr |
| Oct 22, 5:41 PM CDT | River Flood Warning | LSX | 4 days |
| Oct 22, 8:11 PM CDT | River Flood Warning | LSX | 60 hr |
| Oct 28, 3:58 PM CDT | Flash Flood Watch | LSX | 47 hr |
| Oct 29, 3:19 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Oct 29, 8:47 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Oct 29, 9:21 PM CDT | River Flood Warning | LSX | 3 days |
| Oct 29, 9:21 PM CDT | River Flood Warning | LSX | 4 days |
| Oct 30, 2:27 AM CDT | Areal Flood Warning | LSX | 12 hr |
| Oct 30, 4:27 AM CDT | River Flood Warning | LSX | 6 days |
| Oct 30, 2:48 PM CDT | Areal Flood Warning | LSX | 24 hr |
| Oct 31, 2:11 PM CDT | Areal Flood Warning | LSX | 24 hr |
| Nov 4, 3:29 PM CST | Freeze Warning | LSX | 17 hr |
| Nov 15, 2:02 PM CST | Flood Watch | LSX | 37 hr |
| Nov 16, 7:27 PM CST | Areal Flood Advisory | LSX | 7 hr |
| Nov 16, 8:07 PM CST | River Flood Warning | LSX | 4 days |
| Nov 16, 8:07 PM CST | River Flood Warning | LSX | 4 days |
| Dec 6, 3:14 PM CST | Winter Storm Watch | LSX | 23 hr |
| Dec 7, 2:26 PM CST | Winter Storm Warning | LSX | 31 hr |
| Dec 7, 2:26 PM CST | Winter Weather Advisory | LSX | 38 hr |
| Dec 8, 11:22 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 8, 2:48 PM CST | Wind Advisory | LSX | 25 hr |
| Dec 22, 3:39 PM CST | Flood Watch | LSX | 61 hr |
| Dec 24, 3:56 AM CST | Winter Storm Watch | LSX | 11 hr |
| Dec 25, 10:38 AM CST | River Flood Warning | LSX | 45 hr |
| Dec 25, 7:44 PM CST | River Flood Warning | LSX | 36 hr |
| Dec 27, 3:09 AM CST | Winter Weather Advisory | LSX | 13 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 | 8 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 32 |
| Flooding | |
| Areal Flood Warning | 7 |
| Flash Flood Warning | 7 |
| River Flood Warning | 25 |
| Flash Flood Watch | 12 |
| Flood Watch | 2 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Wind Chill Warning | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 5 |
| 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 archive20082010
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.