Alert archive / South Dakota / Davison County
Weather alerts in Davison County, South Dakota, 2016
87 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Davison County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 87
- Warnings
- 13
- Watches
- 18
- Advisories
- 29
- Busiest month
- May13 alerts
- Busiest day
- May 23, 20164 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Davison County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 1 | 67% | 1 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 10 | 1 | 90% | 6 | 17% | 6 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 182 | 116 | 36% | 239 | 82% | 17 min |
| NWS Sioux Falls, SD: flash flood warnings | 34 | 13 | 62% | 23 | 100% | 64 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, 9:23 PM CST | Dense Fog Advisory | FSD | 13 hr |
| Jan 9, 3:45 AM CST | Wind Chill Advisory | FSD | 31 hr |
| Jan 16, 3:32 AM CST | Wind Chill Warning | FSD | 32 hr |
| Jan 16, 3:32 AM CST | Wind Chill Advisory | FSD | 53 hr |
| Jan 24, 3:11 PM CST | Winter Weather Advisory | FSD | 29 hr |
| Feb 1, 3:30 PM CST | Winter Weather Advisory | FSD | 33 hr |
| Feb 5, 3:57 AM CST | High Wind Watch | FSD | 35 hr |
| Feb 6, 3:15 PM CST | Wind Advisory | FSD | 51 hr |
| Feb 13, 3:48 AM CST | Winter Weather Advisory | FSD | 32 hr |
| Feb 18, 2:51 PM CST | High Wind Warning | FSD | 21 hr |
| Feb 18, 2:51 PM CST | Wind Advisory | FSD | 24 hr |
| Feb 19, 4:30 AM CST | Wind Advisory | FSD | 11 hr |
| Feb 29, 12:48 PM CST | Winter Weather Advisory | FSD | 17 hr |
| Mar 13, 9:58 PM CDT | Dense Fog Advisory | FSD | 14 hr |
| Mar 21, 3:37 PM CDT | Winter Storm Watch | FSD | 37 hr |
| Mar 23, 4:07 AM CDT | Winter Weather Advisory | FSD | 17 hr |
| Apr 5, 4:00 PM CDT | Wind Advisory | FSD | 22 hr |
| Apr 6, 2:53 PM CDT | Wind Advisory | FSD | 27 hr |
| Apr 9, 1:28 PM CDT | Wind Advisory | FSD | 6 hr |
| Apr 24, 1:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 6, 3:19 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 9, 2:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 10, 2:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 13, 3:27 AM CDT | Freeze Warning | FSD | 30 hr |
| May 13, 3:44 PM CDT | Frost Advisory | FSD | 17 hr |
| May 22, 7:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 22, 8:22 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 22, 10:23 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| May 23, 1:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| May 25, 2:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 25, 6:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 30, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 30, 6:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 9, 3:07 PM CDT | Heat Advisory | FSD | 54 hr |
| Jun 12, 3:36 AM CDT | Heat Advisory | FSD | 16 hr |
| Jun 17, 11:13 AM CDT | Heat Advisory | FSD | 8 hr |
| Jun 17, 3:06 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 6:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 18, 3:14 AM CDT | Heat Advisory | FSD | 41 hr |
| Jun 19, 3:38 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 19, 5:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 21, 9:49 PM CDT | Mesoscale Discussion | SPC | 26 min |
| Jun 21, 10:21 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 2:31 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 22, 4:43 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 29, 5:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 5, 2:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 5, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 5:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 6, 6:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 6, 7:38 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 9, 3:07 PM CDT | Heat Advisory | FSD | 24 hr |
| Jul 16, 5:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 16, 6:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 3:57 AM CDT | Excessive Heat Watch | FSD | 24 hr |
| Jul 19, 4:06 AM CDT | Excessive Heat Warning | FSD | 5 days |
| Jul 22, 2:16 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 5:40 PM CDT | Severe Thunderstorm Warning | FSD | 50 min |
| Jul 26, 12:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 9, 2:40 PM CDT | Heat Advisory | FSD | 29 hr |
| Aug 11, 9:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 18, 3:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 9:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 18, 10:22 PM CDT | Severe Thunderstorm Warning | FSD | 38 min |
| Sep 4, 4:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 4, 6:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Sep 4, 9:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Sep 4, 10:40 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 5, 3:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 5, 3:34 PM CDT | Flash Flood Watch | FSD | 15 hr |
| Oct 6, 2:43 PM CDT | Frost Advisory | FSD | 18 hr |
| Oct 6, 2:43 PM CDT | Freeze Warning | FSD | 18 hr |
| Oct 11, 2:59 PM CDT | Freeze Watch | FSD | 13 hr |
| Oct 12, 3:39 AM CDT | Freeze Warning | FSD | 29 hr |
| Nov 16, 3:33 AM CST | Winter Storm Watch | FSD | 24 hr |
| Nov 17, 3:34 AM CST | Winter Storm Warning | FSD | 38 hr |
| Nov 18, 2:42 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 6, 3:36 AM CST | Wind Advisory | FSD | 17 hr |
| Dec 9, 11:36 AM CST | Winter Weather Advisory | FSD | 43 hr |
| Dec 14, 3:35 AM CST | Winter Storm Watch | FSD | 32 hr |
| Dec 15, 4:22 AM CST | Winter Storm Warning | FSD | 56 hr |
| Dec 16, 4:02 AM CST | Wind Chill Warning | FSD | 56 hr |
| Dec 20, 8:31 PM CST | Wind Advisory | FSD | 21 hr |
| Dec 24, 11:26 PM CST | Winter Weather Advisory | FSD | 8 hr |
| Dec 25, 3:07 PM CST | Wind Advisory | FSD | 27 hr |
| Dec 25, 8:54 PM CST | High Wind Warning | FSD | 18 hr |
| Dec 25, 8:54 PM CST | Wind Advisory | FSD | 21 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 | 3 |
| Severe Thunderstorm Watch | 11 |
| Mesoscale Discussion | 27 |
| Flooding | |
| Flash Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 3 |
| Wind Chill Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Wind Advisory | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
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.