Alert archive / North Dakota / Sioux County
Weather alerts in Sioux County, North Dakota, 2014
61 weather alerts in 2014, 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 2014. Tap one for its archive.
- Alerts
- 61
- Warnings
- 11
- Watches
- 8
- Advisories
- 6
- Busiest month
- June19 alerts
- Busiest day
- June 18, 20148 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, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 4 | 43% | 1 | 100% | 28 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: tornado warnings | 31 | 1 | 97% | 14 | 21% | 2 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 136 | 84 | 38% | 203 | 83% | 24 min |
| NWS Bismarck, ND: flash flood warnings | 7 | 2 | 71% | 7 | 43% | 86 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, 11:07 AM CDT | River Flood Advisory | BIS | 36 hr |
| Mar 10, 4:40 PM CDT | River Flood Warning | BIS | 6 days |
| Mar 11, 10:09 AM CDT | River Flood Warning | BIS | 48 hr |
| Mar 30, 9:13 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 31, 6:18 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 9, 3:39 PM CDT | River Flood Warning | BIS | 4 days |
| Apr 9, 4:10 PM CDT | Special Weather Statement | BIS | 50 min |
| Apr 9, 4:41 PM CDT | Mesoscale Discussion | SPC | 79 min |
| Apr 23, 12:02 AM CDT | Special Weather Statement | BIS | 58 min |
| Apr 27, 1:58 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 2:29 AM CDT | Special Weather Statement | BIS | 46 min |
| May 27, 2:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 1, 2:08 AM CDT | Special Weather Statement | BIS | 52 min |
| Jun 4, 7:14 PM CDT | Special Weather Statement | BIS | 31 min |
| Jun 4, 7:36 PM CDT | Severe Thunderstorm Warning | BIS | 33 min |
| Jun 16, 7:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 18, 1:19 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 18, 1:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 18, 1:28 PM CDT | Tornado Watch | SPC | 9 hr |
| Jun 18, 2:07 PM CDT | Special Weather Statement | BIS | 23 min |
| Jun 18, 3:02 PM CDT | Special Weather Statement | BIS | 58 min |
| Jun 18, 3:35 PM CDT | Severe Thunderstorm Warning | BIS | 55 min |
| Jun 18, 4:13 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Jun 18, 5:22 PM CDT | Special Weather Statement | BIS | 53 min |
| Jun 19, 6:53 PM CDT | Special Weather Statement | BIS | 37 min |
| Jun 19, 8:05 PM CDT | Special Weather Statement | BIS | 25 min |
| Jun 25, 8:37 PM CDT | Special Weather Statement | BIS | 53 min |
| Jun 27, 9:16 PM CDT | Areal Flood Advisory | BIS | 6 hr |
| Jun 28, 8:26 AM CDT | Areal Flood Advisory | BIS | 12 hr |
| Jun 28, 10:12 AM CDT | Areal Flood Advisory | BIS | 11 hr |
| Jun 28, 11:42 PM CDT | Special Weather Statement | BIS | 63 min |
| Jul 4, 9:41 AM CDT | Special Weather Statement | BIS | 34 min |
| Jul 5, 5:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 5, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 7:36 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 6, 9:50 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 6, 11:11 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 21, 1:09 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 21, 3:20 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 21, 3:56 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 21, 4:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 21, 4:40 PM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jul 21, 5:16 PM CDT | Special Weather Statement | ABR | 29 min |
| Jul 21, 5:37 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Aug 1, 5:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 1, 8:21 PM CDT | Special Weather Statement | BIS | 39 min |
| Aug 4, 9:31 AM CDT | Special Weather Statement | BIS | 44 min |
| Aug 17, 3:52 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 17, 5:34 PM CDT | Special Weather Statement | BIS | 26 min |
| Aug 17, 6:39 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 20, 3:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 20, 5:37 PM CDT | Areal Flood Advisory | BIS | 6 hr |
| Aug 20, 7:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 23, 1:30 PM CDT | Areal Flood Advisory | BIS | 24 hr |
| Aug 24, 12:56 PM CDT | River Flood Warning | BIS | 33 hr |
| Aug 30, 7:27 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 30, 10:29 PM CDT | Special Weather Statement | BIS | 31 min |
| Aug 30, 11:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Nov 9, 11:02 PM CST | Mesoscale Discussion | SPC | 5 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 | 7 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 18 |
| Flooding | |
| River Flood Warning | 4 |
| Areal Flood Advisory | 5 |
| River Flood Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20132015
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.