Alert archive / South Dakota / Davison County
Weather alerts in Davison County, South Dakota, 2019
155 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 155
- Warnings
- 55
- Watches
- 23
- Advisories
- 48
- Busiest month
- July34 alerts
- Busiest day
- September 11, 20199 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Davison County in 2019 had a tornado report inside them.
Davison County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 25 | 21 | 16% | 10 | 90% | 15 min |
| Flash flood warnings | 3 | 3 | 0% | 2 | 100% | 27 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 37 | 10 | 73% | 26 | 50% | 7 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 172 | 107 | 38% | 251 | 88% | 18 min |
| NWS Sioux Falls, SD: flash flood warnings | 32 | 19 | 41% | 26 | 81% | 73 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 7, 2:44 PM CST | Wind Advisory | FSD | 30 hr |
| Jan 16, 3:00 PM CST | Winter Weather Advisory | FSD | 57 hr |
| Jan 17, 2:29 PM CST | Winter Storm Warning | FSD | 34 hr |
| Jan 18, 11:07 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Jan 18, 2:50 PM CST | Wind Chill Advisory | FSD | 19 hr |
| Jan 21, 3:26 AM CST | Winter Weather Advisory | FSD | 35 hr |
| Jan 23, 2:27 PM CST | Wind Chill Advisory | FSD | 43 hr |
| Jan 23, 2:27 PM CST | Winter Weather Advisory | FSD | 20 hr |
| Jan 26, 2:29 PM CST | Winter Weather Advisory | FSD | 46 hr |
| Jan 27, 3:34 AM CST | Wind Chill Watch | FSD | 24 hr |
| Jan 27, 3:48 AM CST | High Wind Warning | FSD | 26 hr |
| Jan 27, 3:48 AM CST | Wind Advisory | FSD | 32 hr |
| Jan 28, 3:34 AM CST | Wind Chill Warning | FSD | 3 days |
| Jan 28, 3:34 AM CST | Wind Chill Advisory | FSD | 35 hr |
| Jan 28, 3:34 AM CST | Wind Chill Advisory | FSD | 3 days |
| Feb 4, 3:22 AM CST | Wind Chill Advisory | FSD | 27 hr |
| Feb 5, 3:25 PM CST | Winter Weather Advisory | FSD | 57 hr |
| Feb 7, 3:19 AM CST | Wind Chill Advisory | FSD | 54 hr |
| Feb 14, 3:40 AM CST | Wind Chill Advisory | FSD | 29 hr |
| Feb 15, 2:55 PM CST | Winter Weather Advisory | FSD | 51 hr |
| Feb 21, 3:52 AM CST | Winter Weather Advisory | FSD | 3 days |
| Feb 24, 2:53 PM CST | Wind Chill Advisory | FSD | 17 hr |
| Mar 2, 3:59 AM CST | Wind Chill Advisory | FSD | 56 hr |
| Mar 2, 3:19 PM CST | Wind Chill Warning | FSD | 21 hr |
| Mar 7, 3:38 AM CST | Winter Storm Watch | FSD | 36 hr |
| Mar 8, 3:10 AM CST | Winter Storm Warning | FSD | 45 hr |
| Mar 8, 3:16 PM CST | Winter Weather Advisory | FSD | 38 hr |
| Mar 9, 5:05 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 11, 3:03 PM CDT | Winter Storm Watch | FSD | 49 hr |
| Mar 11, 3:13 PM CDT | Flood Watch | FSD | 72 hr |
| Mar 12, 3:21 PM CDT | Winter Storm Warning | FSD | 42 hr |
| Mar 12, 5:41 PM CDT | Dense Fog Advisory | FSD | 19 hr |
| Mar 13, 12:55 PM CDT | Areal Flood Warning | FSD | 12 hr |
| Mar 13, 4:03 PM CDT | Winter Weather Advisory | FSD | 27 hr |
| Mar 13, 4:06 PM CDT | Wind Advisory | FSD | 36 hr |
| Mar 14, 1:13 AM CDT | River Flood Warning | FSD | 343 days |
| Mar 14, 2:18 AM CDT | Areal Flood Warning | FSD | 18 hr |
| Mar 14, 8:51 AM CDT | Blizzard Warning | FSD | 6 hr |
| Mar 14, 8:54 PM CDT | Areal Flood Warning | FSD | 12 hr |
| Mar 16, 8:54 PM CDT | River Flood Warning | FSD | 14 days |
| Apr 4, 10:24 PM CDT | Dense Fog Advisory | FSD | 12 hr |
| Apr 8, 3:46 AM CDT | Winter Storm Watch | FSD | 57 hr |
| Apr 9, 3:52 AM CDT | Blizzard Warning | FSD | 3 days |
| Apr 9, 10:55 AM CDT | River Flood Warning | FSD | 11 days |
| Apr 11, 2:34 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 11, 8:28 PM CDT | Winter Weather Advisory | FSD | 17 hr |
| Apr 26, 2:44 PM CDT | Winter Weather Advisory | FSD | 22 hr |
| May 9, 3:38 AM CDT | Frost Advisory | FSD | 28 hr |
| May 17, 4:38 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 17, 7:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 18, 10:03 AM CDT | River Flood Warning | FSD | 14 days |
| May 20, 2:58 PM CDT | Wind Advisory | FSD | 32 hr |
| May 31, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 3:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 24, 3:00 PM CDT | Severe Thunderstorm Warning | FSD | 45 min |
| Jun 27, 3:34 AM CDT | Severe Thunderstorm Warning | FSD | 41 min |
| Jun 27, 3:57 AM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Jun 27, 4:01 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 27, 3:15 PM CDT | Heat Advisory | FSD | 29 hr |
| Jun 28, 2:02 PM CDT | Heat Advisory | FSD | 31 hr |
| Jun 29, 11:59 AM CDT | Excessive Heat Warning | FSD | 9 hr |
| Jun 30, 4:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 30, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 7:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 30, 9:40 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 3, 5:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 7:09 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 10:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 12, 9:48 AM CDT | Severe Thunderstorm Warning | FSD | 27 min |
| Jul 12, 10:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 10:10 AM CDT | Severe Thunderstorm Warning | FSD | 35 min |
| Jul 12, 10:43 AM CDT | Severe Thunderstorm Warning | FSD | 32 min |
| Jul 13, 8:21 AM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Jul 13, 2:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 7:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 14, 2:56 AM CDT | Heat Advisory | FSD | 18 hr |
| Jul 14, 3:33 PM CDT | Heat Advisory | FSD | 29 hr |
| Jul 15, 3:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 15, 5:24 PM CDT | Severe Thunderstorm Warning | FSD | 27 min |
| Jul 16, 11:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 17, 4:07 AM CDT | Heat Advisory | FSD | 9 hr |
| Jul 17, 4:14 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 17, 4:51 AM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Jul 17, 5:27 AM CDT | Severe Thunderstorm Warning | FSD | 63 min |
| Jul 17, 5:19 PM CDT | Heat Advisory | FSD | 28 hr |
| Jul 18, 4:09 PM CDT | Heat Advisory | FSD | 28 hr |
| Jul 20, 5:02 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 20, 5:51 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 5:55 AM CDT | Severe Thunderstorm Warning | FSD | 50 min |
| Jul 20, 6:36 AM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Jul 20, 6:52 AM CDT | Severe Thunderstorm Warning | FSD | 38 min |
| Jul 20, 7:48 AM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| Jul 28, 7:27 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 28, 7:31 PM CDT | Severe Thunderstorm Warning | FSD | 44 min |
| Jul 28, 7:47 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Jul 28, 8:12 PM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Jul 28, 8:21 PM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Aug 3, 8:35 AM CDT | River Flood Warning | FSD | 35 hr |
| Aug 6, 6:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 6, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 9, 12:22 PM CDT | Flood Watch | FSD | 12 hr |
| Aug 9, 2:09 PM CDT | Tornado Watch | SPC | 7 hr |
| Aug 9, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 9, 6:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Aug 9, 6:57 PM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Aug 9, 6:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 1:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Aug 15, 3:09 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 15, 5:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 5:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 17, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Aug 17, 8:24 PM CDT | Severe Thunderstorm Warning | FSD | 36 min |
| Aug 17, 8:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 17, 8:40 PM CDT | Severe Thunderstorm Warning | FSD | 50 min |
| Sep 10, 10:50 AM CDT | River Flood Warning | FSD | 12 days |
| Sep 10, 3:22 PM CDT | Flash Flood Watch | FSD | 16 hr |
| Sep 10, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 10, 8:01 PM CDT | Severe Thunderstorm Warning | FSD | 44 min |
| Sep 10, 8:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Sep 10, 8:33 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 10, 8:41 PM CDT | Severe Thunderstorm Warning | FSD | 49 min |
| Sep 10, 8:52 PM CDT | Tornado Warning | FSD | 23 min |
| Sep 10, 9:28 PM CDT | Severe Thunderstorm Warning | FSD | 29 min |
| Sep 10, 9:29 PM CDT | Flash Flood Warning | FSD | 6 hr |
| Sep 11, 4:07 AM CDT | Flash Flood Watch | FSD | 26 hr |
| Sep 11, 5:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 11, 9:01 PM CDT | Flash Flood Warning | FSD | 4 hr |
| Sep 12, 1:01 AM CDT | Areal Flood Warning | FSD | 10 hr |
| Sep 12, 2:38 AM CDT | Flash Flood Warning | FSD | 4 hr |
| Sep 12, 10:38 AM CDT | Areal Flood Warning | FSD | 24 hr |
| Sep 13, 10:29 AM CDT | Areal Flood Warning | FSD | 24 hr |
| Sep 14, 10:25 AM CDT | Areal Flood Warning | FSD | 48 hr |
| Sep 15, 3:19 AM CDT | Dense Fog Advisory | FSD | 9 hr |
| Sep 21, 1:22 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Oct 3, 3:19 PM CDT | Frost Advisory | FSD | 18 hr |
| Oct 4, 3:31 PM CDT | Wind Advisory | FSD | 27 hr |
| Oct 10, 3:22 AM CDT | Winter Weather Advisory | FSD | 67 hr |
| Oct 12, 9:55 AM CDT | Wind Advisory | FSD | 9 hr |
| Oct 20, 9:20 PM CDT | Wind Advisory | FSD | 43 hr |
| Nov 5, 1:03 PM CST | Winter Weather Advisory | FSD | 17 hr |
| Nov 24, 2:01 PM CST | Winter Storm Watch | FSD | 25 hr |
| Nov 25, 4:05 AM CST | Winter Storm Warning | FSD | 56 hr |
| Nov 25, 2:45 PM CST | Winter Weather Advisory | FSD | 36 hr |
| Nov 27, 5:56 PM CST | Winter Weather Advisory | FSD | 4 days |
| Nov 30, 3:26 AM CST | Winter Weather Advisory | FSD | 33 hr |
| Dec 8, 12:21 PM CST | Dense Fog Advisory | FSD | 15 hr |
| Dec 13, 9:07 AM CST | Dense Fog Advisory | FSD | 7 hr |
| Dec 24, 2:24 PM CST | Dense Fog Advisory | FSD | 34 hr |
| Dec 26, 3:10 PM CST | Winter Storm Watch | FSD | 24 hr |
| Dec 27, 3:18 PM CST | Winter Storm Warning | FSD | 63 hr |
| Dec 27, 3:18 PM CST | Winter Weather Advisory | FSD | 3 days |
| Dec 29, 12:02 PM CST | Blizzard Warning | FSD | 12 hr |
| Dec 29, 12:02 PM CST | Winter Storm Warning | FSD | 18 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.