Alert archive / Iowa / Lyon County
Weather alerts in Lyon County, Iowa, 2013
92 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lyon County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 92
- Warnings
- 20
- Watches
- 15
- Advisories
- 39
- Busiest month
- May18 alerts
- Busiest day
- September 1, 20136 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lyon County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 9 | 7 | 22% | 2 | 100% | 25 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 20 | 12 | 40% | 38 | 84% | 21 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 123 | 86 | 30% | 169 | 87% | 21 min |
| NWS Sioux Falls, SD: flash flood warnings | 16 | 11 | 31% | 17 | 82% | 89 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 10, 3:37 PM CST | Dense Fog Advisory | FSD | 28 hr |
| Jan 11, 3:52 AM CST | Wind Advisory | FSD | 29 hr |
| Jan 18, 3:14 PM CST | Wind Advisory | FSD | 29 hr |
| Jan 20, 3:44 AM CST | Wind Chill Advisory | FSD | 48 hr |
| Jan 23, 3:20 AM CST | Wind Chill Advisory | FSD | 30 hr |
| Jan 26, 3:27 AM CST | Freezing Rain Advisory | FSD | 36 hr |
| Jan 27, 7:35 PM CST | Dense Fog Advisory | FSD | 30 hr |
| Jan 30, 4:09 AM CST | Wind Chill Advisory | FSD | 53 hr |
| Feb 9, 3:58 PM CST | Winter Weather Advisory | FSD | 44 hr |
| Feb 17, 3:11 PM CST | Wind Advisory | FSD | 30 hr |
| Feb 18, 2:51 PM CST | Wind Chill Advisory | FSD | 42 hr |
| Feb 19, 3:36 AM CST | Winter Storm Watch | FSD | 35 hr |
| Feb 20, 11:02 AM CST | Winter Weather Advisory | FSD | 49 hr |
| Mar 3, 3:45 AM CST | Winter Weather Advisory | FSD | 59 hr |
| Mar 9, 4:55 AM CST | Winter Weather Advisory | FSD | 42 hr |
| Mar 9, 7:13 PM CST | River Flood Warning | FSD | 14 hr |
| Mar 10, 1:12 PM CDT | Winter Weather Advisory | FSD | 4 hr |
| Mar 17, 4:27 AM CDT | Wind Advisory | FSD | 39 hr |
| Mar 17, 4:41 AM CDT | Winter Weather Advisory | FSD | 31 hr |
| Mar 30, 11:29 PM CDT | Dense Fog Advisory | FSD | 4 hr |
| Apr 8, 4:59 AM CDT | Winter Storm Warning | FSD | 3 days |
| Apr 8, 5:41 AM CDT | Dense Fog Advisory | FSD | 4 hr |
| Apr 8, 8:27 PM CDT | Winter Weather Advisory | FSD | 15 hr |
| Apr 11, 2:40 AM CDT | Mesoscale Discussion | SPC | 5 hr |
| Apr 16, 3:30 PM CDT | Winter Weather Advisory | FSD | 48 hr |
| Apr 17, 3:42 PM CDT | Winter Storm Warning | FSD | 24 hr |
| Apr 18, 3:59 PM CDT | Winter Storm Warning | FSD | 9 hr |
| Apr 21, 4:05 PM CDT | Winter Weather Advisory | FSD | 30 hr |
| May 1, 4:07 AM CDT | Winter Weather Advisory | FSD | 23 hr |
| May 11, 3:59 AM CDT | Freeze Warning | FSD | 29 hr |
| May 18, 8:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 18, 9:26 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 19, 1:48 AM CDT | Mesoscale Discussion | SPC | 87 min |
| May 25, 10:41 PM CDT | Severe Thunderstorm Warning | FSD | 49 min |
| May 25, 10:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 26, 1:26 AM CDT | Flash Flood Warning | FSD | 6 hr |
| May 26, 4:31 AM CDT | Flash Flood Watch | FSD | 26 hr |
| May 27, 12:42 AM CDT | Flash Flood Warning | FSD | 4 hr |
| May 27, 3:59 AM CDT | River Flood Warning | FSD | 8 hr |
| May 27, 4:46 AM CDT | Areal Flood Warning | FSD | 6 hr |
| May 27, 4:51 AM CDT | Areal Flood Warning | FSD | 6 hr |
| May 27, 6:57 AM CDT | Flash Flood Watch | FSD | 22 hr |
| May 28, 3:30 AM CDT | Dense Fog Advisory | FSD | 6 hr |
| May 28, 3:23 PM CDT | Flash Flood Watch | FSD | 37 hr |
| May 29, 1:51 AM CDT | Dense Fog Advisory | FSD | 7 hr |
| May 29, 6:24 PM CDT | Tornado Watch | SPC | 4 hr |
| Jun 11, 11:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 15, 7:40 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 1:58 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 21, 2:12 PM CDT | Flash Flood Watch | FSD | 17 hr |
| Jun 21, 7:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 21, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 12:40 AM CDT | Severe Thunderstorm Warning | FSD | 65 min |
| Jun 22, 4:18 AM CDT | Flash Flood Watch | FSD | 27 hr |
| Jun 22, 9:15 AM CDT | River Flood Warning | FSD | 4 days |
| Jun 22, 7:47 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Jun 22, 8:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 22, 9:21 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 11:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 7, 5:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 7, 6:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 7, 9:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 1:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 25, 12:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 25, 1:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 5:18 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 6, 5:22 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 3:13 AM CDT | Heat Advisory | FSD | 7 days |
| Aug 31, 3:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 31, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Aug 31, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 31, 9:53 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| Aug 31, 10:19 PM CDT | Severe Thunderstorm Warning | FSD | 41 min |
| Aug 31, 10:27 PM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Aug 31, 10:55 PM CDT | Severe Thunderstorm Warning | FSD | 50 min |
| Oct 2, 2:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Oct 2, 5:18 PM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| Oct 4, 5:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Oct 10, 4:21 AM CDT | Wind Advisory | FSD | 41 hr |
| Oct 12, 2:56 PM CDT | Frost Advisory | FSD | 18 hr |
| Nov 2, 2:56 PM CDT | Wind Advisory | FSD | 28 hr |
| Nov 4, 3:31 PM CST | Winter Weather Advisory | FSD | 36 hr |
| Dec 3, 3:42 AM CST | Winter Weather Advisory | FSD | 41 hr |
| Dec 4, 3:17 PM CST | Wind Chill Advisory | FSD | 69 hr |
| Dec 7, 3:00 PM CST | Winter Weather Advisory | FSD | 24 hr |
| Dec 8, 3:54 AM CST | Wind Chill Advisory | FSD | 32 hr |
| Dec 10, 12:32 AM CST | Wind Advisory | FSD | 5 hr |
| Dec 10, 3:49 AM CST | Wind Chill Advisory | FSD | 32 hr |
| Dec 22, 3:54 AM CST | Wind Chill Advisory | FSD | 56 hr |
| Dec 27, 3:14 PM CST | Wind Chill Advisory | FSD | 60 hr |
| Dec 28, 4:04 AM CST | Wind Advisory | FSD | 24 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 | 9 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 18 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| River Flood Warning | 3 |
| Flash Flood Watch | 5 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 13 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 9 |
| Wind and dust | |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.