Alert archive / North Dakota / Sioux County
Weather alerts in Sioux County, North Dakota, 2022
48 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sioux County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 48
- Warnings
- 12
- Watches
- 14
- Advisories
- 0
- Busiest month
- July17 alerts
- Busiest day
- July 4, 20226 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sioux County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 6 | 25% | 3 | 100% | 2 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: tornado warnings | 9 | 3 | 67% | 9 | 56% | 10 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 159 | 118 | 26% | 291 | 88% | 24 min |
| NWS Bismarck, ND: flash flood warnings | 2 | 2 | 0% | 3 | 100% | 39 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 |
|---|---|---|---|
| Feb 21, 1:10 AM CST | Mesoscale Discussion | SPC | 5 hr |
| May 7, 2:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 12, 2:00 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 12, 4:36 AM CDT | Severe Thunderstorm Warning | BIS | 39 min |
| May 23, 3:11 PM CDT | Special Weather Statement | BIS | 34 min |
| May 27, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 27, 6:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 13, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 13, 11:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 13, 11:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 19, 7:09 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 12:33 AM CDT | Special Weather Statement | BIS | 27 min |
| Jun 24, 1:40 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 6:11 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 29, 8:24 PM CDT | Severe Thunderstorm Warning | BIS | 51 min |
| Jun 29, 9:10 PM CDT | Severe Thunderstorm Warning | BIS | 50 min |
| Jun 29, 9:29 PM CDT | Severe Thunderstorm Warning | BIS | 34 min |
| Jul 2, 8:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 2, 8:53 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 10:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 8:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 9:50 PM CDT | Special Weather Statement | BIS | 25 min |
| Jul 4, 12:39 AM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jul 4, 12:52 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 4, 1:40 AM CDT | Severe Thunderstorm Warning | BIS | 50 min |
| Jul 4, 2:26 AM CDT | Special Weather Statement | BIS | 34 min |
| Jul 5, 4:23 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 6:26 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 2:50 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 21, 4:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 21, 5:37 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Jul 23, 3:23 AM CDT | Special Weather Statement | BIS | 37 min |
| Jul 23, 3:32 AM CDT | Severe Thunderstorm Warning | BIS | 43 min |
| Jul 23, 4:02 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 5:30 PM CDT | Special Weather Statement | BIS | 30 min |
| Aug 22, 5:51 PM CDT | Special Weather Statement | BIS | 24 min |
| Aug 22, 7:00 PM CDT | Special Weather Statement | BIS | 30 min |
| Oct 11, 12:57 PM CDT | Fire Weather Watch | BIS | 14 hr |
| Oct 12, 3:07 AM CDT | Red Flag Warning | BIS | 17 hr |
| Oct 12, 10:42 AM CDT | Fire Weather Watch | BIS | 9 hr |
| Oct 12, 7:59 PM CDT | Red Flag Warning | BIS | 24 hr |
| Oct 19, 2:44 PM CDT | Fire Weather Watch | BIS | 12 hr |
| Oct 20, 2:24 AM CDT | Red Flag Warning | BIS | 17 hr |
| Nov 1, 3:26 AM CDT | Fire Weather Watch | BIS | 24 hr |
| Nov 2, 3:45 AM CDT | Red Flag Warning | BIS | 15 hr |
| Nov 9, 11:00 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 22, 9:23 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 22, 1:55 PM CST | Mesoscale Discussion | SPC | 4 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 |
| Severe Thunderstorm Watch | 10 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 8 |
| Fire | |
| Red Flag Warning | 4 |
| Fire Weather Watch | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
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.