Alert archive / North Dakota / Sioux County
Weather alerts in Sioux County, North Dakota, 2016
101 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 101
- Warnings
- 31
- Watches
- 20
- Advisories
- 0
- Busiest month
- July47 alerts
- Busiest day
- July 11, 201614 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 Sioux County in 2016 had a tornado report inside them.
Sioux County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 24 | 11% | 14 | 100% | 24 min |
| 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 Bismarck, ND: tornado warnings | 26 | 6 | 77% | 18 | 61% | 11 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 259 | 195 | 25% | 463 | 91% | 26 min |
| NWS Bismarck, ND: flash flood warnings | 4 | 1 | 75% | 5 | 40% | 112 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 2, 2:58 PM CST | Special Weather Statement | BIS | 47 min |
| Apr 3, 2:48 AM CDT | Red Flag Warning | BIS | 17 hr |
| Apr 4, 3:09 PM CDT | Fire Weather Watch | BIS | 12 hr |
| Apr 5, 3:35 AM CDT | Red Flag Warning | BIS | 15 hr |
| Apr 15, 12:21 AM CDT | Special Weather Statement | BIS | 39 min |
| Apr 15, 1:05 AM CDT | Special Weather Statement | BIS | 40 min |
| Apr 15, 1:40 AM CDT | Special Weather Statement | BIS | 50 min |
| Apr 15, 2:29 AM CDT | Special Weather Statement | BIS | 46 min |
| May 22, 3:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 22, 5:21 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 22, 9:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| May 25, 4:13 PM CDT | Special Weather Statement | BIS | 47 min |
| May 25, 4:24 PM CDT | Special Weather Statement | BIS | 51 min |
| May 25, 4:43 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| May 25, 5:36 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| May 28, 6:06 PM CDT | Special Weather Statement | BIS | 39 min |
| May 30, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 30, 3:37 PM CDT | Severe Thunderstorm Warning | BIS | 43 min |
| May 30, 5:46 PM CDT | Special Weather Statement | BIS | 44 min |
| Jun 2, 3:03 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 2, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 2, 7:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 9, 10:58 PM CDT | Special Weather Statement | BIS | 47 min |
| Jun 11, 6:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 11, 6:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 11, 8:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 16, 6:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 16, 11:29 PM CDT | Special Weather Statement | BIS | 31 min |
| Jun 17, 1:26 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 8:35 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 9:37 PM CDT | Tornado Warning | BIS | 23 min |
| Jun 21, 10:02 PM CDT | Severe Thunderstorm Warning | BIS | 43 min |
| Jun 22, 12:30 AM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jun 29, 1:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 29, 2:08 PM CDT | Special Weather Statement | BIS | 52 min |
| Jul 3, 3:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 6, 6:39 PM CDT | Severe Thunderstorm Warning | BIS | 51 min |
| Jul 6, 7:26 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 6, 8:28 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Jul 9, 6:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 9, 8:06 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Jul 9, 8:32 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 9:00 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 9, 9:50 PM CDT | Severe Thunderstorm Warning | BIS | 40 min |
| Jul 10, 4:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 10, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 10, 6:36 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Jul 10, 7:32 PM CDT | Severe Thunderstorm Warning | BIS | 58 min |
| Jul 10, 7:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 10, 8:28 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Jul 10, 9:34 PM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Jul 10, 10:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 12:27 AM CDT | Severe Thunderstorm Warning | BIS | 63 min |
| Jul 11, 12:55 AM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jul 11, 1:32 AM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 11, 1:52 AM CDT | Severe Thunderstorm Warning | BIS | 23 min |
| Jul 11, 4:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 11, 3:10 PM CDT | Special Weather Statement | BIS | 50 min |
| Jul 11, 4:03 PM CDT | Special Weather Statement | BIS | 42 min |
| Jul 11, 4:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 11, 4:28 PM CDT | Special Weather Statement | BIS | 47 min |
| Jul 16, 12:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 1:09 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 16, 3:14 PM CDT | Severe Thunderstorm Warning | BIS | 61 min |
| Jul 16, 3:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 16, 4:15 PM CDT | Severe Thunderstorm Warning | BIS | 43 min |
| Jul 20, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 2:17 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 22, 5:32 PM CDT | Severe Thunderstorm Warning | BIS | 58 min |
| Jul 22, 5:58 PM CDT | Areal Flood Warning | BIS | 15 hr |
| Jul 22, 6:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 22, 6:46 PM CDT | Severe Thunderstorm Warning | BIS | 44 min |
| Jul 22, 9:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 6:24 PM CDT | Severe Thunderstorm Warning | BIS | 51 min |
| Jul 26, 7:24 PM CDT | Special Weather Statement | BIS | 51 min |
| Jul 26, 7:32 PM CDT | Severe Thunderstorm Warning | BIS | 58 min |
| Jul 31, 2:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 3:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 31, 5:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 8:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 1, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 6:17 PM CDT | Special Weather Statement | BIS | 43 min |
| Aug 1, 6:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 2:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 3, 3:38 PM CDT | Tornado Watch | SPC | 7 hr |
| Aug 9, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 9, 7:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 9:39 PM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Aug 9, 9:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 9, 10:40 PM CDT | Severe Thunderstorm Warning | BIS | 49 min |
| Aug 9, 11:43 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Aug 10, 5:59 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 8:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 14, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 23, 10:41 AM CDT | Special Weather Statement | BIS | 34 min |
| Oct 3, 5:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Dec 25, 12:56 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 25, 6:33 PM CST | Mesoscale Discussion | SPC | 6 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 | 27 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 18 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 32 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
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.