Alert archive / North Dakota / Sioux County
Weather alerts in Sioux County, North Dakota, 2008
116 weather alerts in 2008, 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 2008. Tap one for its archive.
- Alerts
- 116
- Warnings
- 57
- Watches
- 29
- Advisories
- 1
- Busiest month
- July37 alerts
- Busiest day
- July 10, 20089 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Sioux County in 2008 had a tornado report inside them.
Sioux County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 0 | ||
| Severe thunderstorm warnings | 32 | 10 | 69% | 6 | 100% | 35 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: tornado warnings | 60 | 15 | 75% | 24 | 79% | 14 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 432 | 134 | 69% | 216 | 90% | 27 min |
| NWS Bismarck, ND: flash flood warnings | 10 | 3 | 70% | 4 | 75% | 10 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 |
|---|---|---|---|
| Mar 10, 3:28 PM CDT | Red Flag Warning | BIS | 4 hr |
| Mar 24, 5:03 AM CDT | Red Flag Warning | BIS | 17 hr |
| Mar 29, 5:22 AM CDT | Red Flag Warning | BIS | 13 hr |
| Apr 4, 4:55 AM CDT | Red Flag Warning | BIS | 16 hr |
| Apr 13, 4:05 AM CDT | Fire Weather Watch | BIS | 25 hr |
| Apr 14, 4:58 AM CDT | Red Flag Warning | BIS | 17 hr |
| Apr 14, 4:08 PM CDT | Fire Weather Watch | BIS | 12 hr |
| Apr 15, 4:24 AM CDT | Red Flag Warning | BIS | 18 hr |
| Apr 16, 2:21 PM CDT | Red Flag Warning | BIS | 7 hr |
| Apr 17, 4:03 PM CDT | Fire Weather Watch | BIS | 13 hr |
| Apr 18, 4:38 AM CDT | Red Flag Warning | BIS | 16 hr |
| Apr 18, 3:43 PM CDT | Fire Weather Watch | BIS | 13 hr |
| Apr 19, 4:37 AM CDT | Red Flag Warning | BIS | 20 hr |
| Apr 20, 5:25 AM CDT | Red Flag Warning | BIS | 17 hr |
| Apr 20, 7:05 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Apr 21, 4:19 PM CDT | Fire Weather Watch | BIS | 12 hr |
| Apr 22, 4:45 AM CDT | Red Flag Warning | BIS | 17 hr |
| Apr 27, 4:57 AM CDT | Red Flag Warning | BIS | 16 hr |
| Apr 28, 4:07 AM CDT | Red Flag Warning | BIS | 17 hr |
| May 4, 4:25 AM CDT | Red Flag Warning | BIS | 17 hr |
| May 15, 1:00 PM CDT | Fire Weather Watch | BIS | 16 hr |
| May 16, 4:37 AM CDT | Red Flag Warning | BIS | 16 hr |
| May 16, 1:45 PM CDT | Fire Weather Watch | BIS | 15 hr |
| May 17, 4:21 AM CDT | Red Flag Warning | BIS | 17 hr |
| May 18, 3:45 PM CDT | Fire Weather Watch | BIS | 13 hr |
| May 19, 4:29 AM CDT | Red Flag Warning | BIS | 17 hr |
| May 21, 12:56 PM CDT | Red Flag Warning | BIS | 8 hr |
| May 24, 5:55 PM CDT | Severe Thunderstorm Warning | BIS | 50 min |
| May 24, 6:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 24, 6:24 PM CDT | Tornado Watch | SPC | 5 hr |
| May 24, 6:43 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| May 24, 9:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 30, 7:39 PM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jun 8, 2:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 1:53 AM CDT | Areal Flood Advisory | BIS | 9 hr |
| Jun 11, 2:19 AM CDT | Severe Thunderstorm Warning | BIS | 26 min |
| Jun 11, 2:45 AM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jun 13, 5:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 14, 1:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 4:59 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 5:33 PM CDT | Severe Thunderstorm Warning | BIS | 57 min |
| Jun 18, 8:32 PM CDT | Severe Thunderstorm Warning | BIS | 58 min |
| Jun 18, 8:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 18, 8:56 PM CDT | Tornado Warning | BIS | 49 min |
| Jun 18, 9:27 PM CDT | Severe Thunderstorm Warning | BIS | 63 min |
| Jun 24, 12:51 AM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Jun 24, 2:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 24, 2:51 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 24, 6:39 PM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jun 24, 7:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 24, 7:46 PM CDT | Severe Thunderstorm Warning | BIS | 59 min |
| Jun 24, 7:52 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 1:59 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 26, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | 47 min |
| Jun 26, 6:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 26, 6:46 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 26, 7:15 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jun 26, 7:50 PM CDT | Severe Thunderstorm Warning | BIS | 25 min |
| Jun 26, 8:15 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 7, 3:26 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 7:34 PM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Jul 10, 3:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 10, 4:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 10, 4:29 PM CDT | Fire Weather Watch | BIS | 13 hr |
| Jul 10, 4:41 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 10, 5:44 PM CDT | Severe Thunderstorm Warning | BIS | 61 min |
| Jul 10, 5:50 PM CDT | Tornado Warning | BIS | 40 min |
| Jul 10, 6:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 10, 6:45 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 11, 5:18 AM CDT | Red Flag Warning | BIS | 16 hr |
| Jul 15, 5:39 PM CDT | Severe Thunderstorm Warning | BIS | 51 min |
| Jul 15, 8:07 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Jul 19, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 7:38 PM CDT | Severe Thunderstorm Warning | BIS | 67 min |
| Jul 23, 5:23 PM CDT | Severe Thunderstorm Warning | BIS | 67 min |
| Jul 23, 6:24 PM CDT | Tornado Warning | BIS | 36 min |
| Jul 23, 6:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 6:51 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 23, 6:57 PM CDT | Severe Thunderstorm Warning | BIS | 29 min |
| Jul 26, 9:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 27, 2:25 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 27, 2:40 AM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jul 27, 3:14 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 27, 3:39 AM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jul 27, 3:44 AM CDT | Severe Thunderstorm Warning | BIS | 61 min |
| Jul 28, 3:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 28, 7:34 PM CDT | Tornado Watch | SPC | 4 hr |
| Jul 30, 3:39 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 30, 4:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 30, 7:04 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 30, 7:19 PM CDT | Severe Thunderstorm Warning | BIS | 33 min |
| Jul 30, 10:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 12:46 AM CDT | Severe Thunderstorm Warning | BIS | 59 min |
| Jul 31, 12:50 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 31, 1:48 AM CDT | Severe Thunderstorm Warning | BIS | 57 min |
| Jul 31, 3:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 3, 12:05 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 3, 4:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 11, 2:34 PM CDT | Severe Thunderstorm Warning | BIS | 41 min |
| Aug 26, 2:33 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 26, 8:21 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Aug 29, 3:54 AM CDT | Fire Weather Watch | BIS | 24 hr |
| Aug 30, 4:11 AM CDT | Red Flag Warning | BIS | 18 hr |
| Aug 30, 4:11 PM CDT | Fire Weather Watch | BIS | 11 hr |
| Aug 31, 3:37 AM CDT | Red Flag Warning | BIS | 18 hr |
| Sep 22, 5:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 22, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 22, 10:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Sep 23, 1:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 7, 3:56 PM CDT | Red Flag Warning | BIS | 29 hr |
| Nov 6, 12:38 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 6, 6:32 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 14, 2:17 PM CST | Mesoscale Discussion | SPC | 58 min |
| Dec 2, 12:29 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 13, 6:29 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 26, 11:56 AM 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 | 32 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 15 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 29 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Fire | |
| Red Flag Warning | 22 |
| Fire Weather Watch | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20072009
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.