Alert archive / South Dakota / Butte County
Weather alerts in Butte County, South Dakota, 2021
145 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Butte County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 145
- Warnings
- 54
- Watches
- 25
- Advisories
- 28
- Busiest month
- July29 alerts
- Busiest day
- June 11, 20219 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Butte County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 25 | 21 | 16% | 25 | 76% | 30 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Rapid City, SD: tornado warnings | 5 | 3 | 40% | 7 | 86% | 22 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 212 | 171 | 19% | 380 | 79% | 26 min |
| NWS Rapid City, SD: flash flood warnings | 2 | 0 | 100% | 0 |
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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 11, 1:23 PM MST | High Wind Watch | UNR | 37 hr |
| Jan 13, 2:14 AM MST | High Wind Warning | UNR | 58 hr |
| Jan 25, 2:08 AM MST | Dense Fog Advisory | UNR | 7 hr |
| Jan 29, 8:49 PM MST | Dense Fog Advisory | UNR | 14 hr |
| Feb 5, 6:44 PM MST | Winter Weather Advisory | UNR | 13 hr |
| Feb 7, 8:10 PM MST | Wind Chill Advisory | UNR | 39 hr |
| Feb 9, 1:32 PM MST | Wind Chill Advisory | UNR | 4 days |
| Feb 11, 1:50 PM MST | Wind Chill Warning | UNR | 5 days |
| Feb 15, 1:10 PM MST | Wind Chill Advisory | UNR | 19 hr |
| Feb 21, 1:41 PM MST | High Wind Warning | UNR | 27 hr |
| Feb 21, 1:41 PM MST | Wind Advisory | UNR | 27 hr |
| Feb 22, 2:23 PM MST | High Wind Warning | UNR | 27 hr |
| Feb 22, 2:23 PM MST | Wind Advisory | UNR | 27 hr |
| Mar 5, 2:20 AM MST | Fire Weather Watch | UNR | 11 hr |
| Mar 5, 12:59 PM MST | Red Flag Warning | UNR | 30 hr |
| Mar 14, 5:20 PM MDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 26, 2:00 PM MDT | Fire Weather Watch | UNR | 37 hr |
| Mar 27, 2:24 AM MDT | High Wind Watch | UNR | 36 hr |
| Mar 27, 1:56 PM MDT | Red Flag Warning | UNR | 3 days |
| Mar 28, 2:23 AM MDT | High Wind Warning | UNR | 46 hr |
| Mar 29, 2:45 PM MDT | Wind Advisory | UNR | 29 hr |
| Mar 31, 3:01 AM MDT | Fire Weather Watch | UNR | 11 hr |
| Mar 31, 1:37 PM MDT | Red Flag Warning | UNR | 53 hr |
| Apr 1, 2:16 PM MDT | Red Flag Warning | UNR | 29 hr |
| Apr 8, 2:31 PM MDT | Wind Advisory | UNR | 25 hr |
| Apr 10, 2:27 PM MDT | High Wind Warning | UNR | 16 hr |
| Apr 10, 2:27 PM MDT | Wind Advisory | UNR | 3 days |
| Apr 18, 2:32 AM MDT | Winter Weather Advisory | UNR | 54 hr |
| Apr 29, 2:23 AM MDT | Fire Weather Watch | UNR | 24 hr |
| Apr 29, 2:23 PM MDT | Red Flag Warning | UNR | 30 hr |
| May 20, 12:58 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| May 20, 8:24 PM MDT | Special Weather Statement | UNR | 51 min |
| May 23, 1:50 PM MDT | Tornado Watch | SPC | 7 hr |
| May 23, 4:26 PM MDT | Severe Thunderstorm Warning | UNR | 33 min |
| May 23, 5:04 PM MDT | Severe Thunderstorm Warning | UNR | 30 min |
| May 23, 5:25 PM MDT | Mesoscale Discussion | SPC | 95 min |
| May 24, 1:31 PM MDT | Wind Advisory | UNR | 28 hr |
| May 26, 10:47 AM MDT | Special Weather Statement | UNR | 28 min |
| May 26, 4:37 PM MDT | Special Weather Statement | UNR | 38 min |
| Jun 8, 2:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 6:37 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 8, 7:00 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 8, 7:48 PM MDT | Severe Thunderstorm Warning | UNR | 57 min |
| Jun 8, 8:44 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 8, 8:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jun 10, 3:35 AM MDT | High Wind Warning | UNR | 26 hr |
| Jun 10, 2:51 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 10, 7:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 7:44 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 10, 8:08 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 10, 8:38 PM MDT | Severe Thunderstorm Warning | UNR | 67 min |
| Jun 10, 8:44 PM MDT | Severe Thunderstorm Warning | UNR | 46 min |
| Jun 10, 9:02 PM MDT | Severe Thunderstorm Warning | UNR | 43 min |
| Jun 10, 9:29 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 10, 10:07 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 10, 10:30 PM MDT | Severe Thunderstorm Warning | UNR | 45 min |
| Jun 16, 2:22 AM MDT | Wind Advisory | UNR | 13 hr |
| Jun 19, 3:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 19, 4:39 PM MDT | Special Weather Statement | UNR | 51 min |
| Jun 19, 4:42 PM MDT | Severe Thunderstorm Warning | UNR | 63 min |
| Jun 19, 7:23 PM MDT | Special Weather Statement | UNR | 52 min |
| Jun 23, 10:21 PM MDT | Special Weather Statement | UNR | 39 min |
| Jun 23, 10:59 PM MDT | Special Weather Statement | UNR | 61 min |
| Jul 2, 6:53 PM MDT | Special Weather Statement | UNR | 37 min |
| Jul 2, 7:24 PM MDT | Special Weather Statement | UNR | 51 min |
| Jul 4, 8:28 PM MDT | Special Weather Statement | UNR | 32 min |
| Jul 4, 9:00 PM MDT | Special Weather Statement | UNR | 30 min |
| Jul 5, 12:34 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 6, 5:08 PM MDT | Severe Thunderstorm Warning | UNR | 67 min |
| Jul 6, 5:58 PM MDT | Severe Thunderstorm Warning | UNR | 60 min |
| Jul 6, 7:51 PM MDT | Severe Thunderstorm Warning | UNR | 54 min |
| Jul 8, 12:33 AM MDT | Special Weather Statement | UNR | 57 min |
| Jul 8, 2:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 8, 3:36 PM MDT | Severe Thunderstorm Warning | UNR | 54 min |
| Jul 8, 3:49 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 8, 4:29 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jul 8, 4:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 2:56 AM MDT | Special Weather Statement | UNR | 49 min |
| Jul 10, 3:33 AM MDT | Special Weather Statement | UNR | 42 min |
| Jul 13, 4:25 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 13, 8:22 PM MDT | Special Weather Statement | UNR | 38 min |
| Jul 13, 8:25 PM MDT | Severe Thunderstorm Warning | UNR | 50 min |
| Jul 13, 8:59 PM MDT | Areal Flood Advisory | UNR | 2 hr |
| Jul 13, 9:12 PM MDT | Severe Thunderstorm Warning | UNR | 63 min |
| Jul 22, 2:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 3:33 PM MDT | Severe Thunderstorm Warning | UNR | 57 min |
| Jul 22, 4:01 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Jul 22, 4:29 PM MDT | Special Weather Statement | UNR | 61 min |
| Jul 22, 4:42 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 22, 4:48 PM MDT | Severe Thunderstorm Warning | UNR | 57 min |
| Jul 23, 4:04 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 26, 2:03 AM MDT | Heat Advisory | UNR | 66 hr |
| Aug 6, 1:43 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 6, 4:36 PM MDT | Severe Thunderstorm Warning | UNR | 33 min |
| Aug 6, 6:18 PM MDT | Special Weather Statement | UNR | 27 min |
| Aug 6, 6:28 PM MDT | Special Weather Statement | UNR | 32 min |
| Aug 8, 9:07 PM MDT | Wind Advisory | UNR | 6 hr |
| Aug 9, 3:36 AM MDT | Fire Weather Watch | UNR | 24 hr |
| Aug 10, 3:10 AM MDT | Red Flag Warning | UNR | 18 hr |
| Aug 16, 1:41 PM MDT | Red Flag Warning | UNR | 30 hr |
| Aug 22, 2:12 PM MDT | Red Flag Warning | UNR | 30 hr |
| Aug 22, 7:20 PM MDT | Fire Weather Watch | UNR | 8 hr |
| Aug 23, 4:48 PM MDT | Special Weather Statement | UNR | 42 min |
| Aug 23, 5:17 PM MDT | Severe Thunderstorm Warning | UNR | 58 min |
| Aug 27, 2:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 4:27 PM MDT | Severe Thunderstorm Warning | UNR | 78 min |
| Aug 27, 5:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 27, 5:39 PM MDT | Severe Thunderstorm Warning | UNR | 96 min |
| Sep 4, 1:39 PM MDT | Fire Weather Watch | UNR | 24 hr |
| Sep 5, 1:44 PM MDT | Red Flag Warning | UNR | 29 hr |
| Sep 7, 2:06 PM MDT | Fire Weather Watch | UNR | 48 hr |
| Sep 9, 2:26 AM MDT | Red Flag Warning | UNR | 41 hr |
| Sep 14, 1:27 PM MDT | Fire Weather Watch | UNR | 14 hr |
| Sep 15, 3:09 AM MDT | Red Flag Warning | UNR | 16 hr |
| Sep 17, 2:44 AM MDT | Fire Weather Watch | UNR | 11 hr |
| Sep 17, 1:17 PM MDT | Red Flag Warning | UNR | 32 hr |
| Sep 19, 2:36 AM MDT | Wind Advisory | UNR | 23 hr |
| Sep 27, 1:45 AM MDT | Fire Weather Watch | UNR | 11 hr |
| Sep 27, 1:01 PM MDT | Red Flag Warning | UNR | 30 hr |
| Oct 3, 1:55 AM MDT | Fire Weather Watch | UNR | 24 hr |
| Oct 4, 1:58 AM MDT | Red Flag Warning | UNR | 17 hr |
| Oct 5, 1:49 PM MDT | Fire Weather Watch | UNR | 13 hr |
| Oct 6, 2:36 AM MDT | Red Flag Warning | UNR | 16 hr |
| Oct 11, 3:07 PM MDT | Winter Storm Warning | UNR | 51 hr |
| Oct 11, 3:07 PM MDT | Winter Weather Advisory | UNR | 44 hr |
| Oct 13, 3:58 AM MDT | Mesoscale Discussion | SPC | 6 hr |
| Oct 25, 1:33 AM MDT | Dense Fog Advisory | UNR | 7 hr |
| Nov 10, 1:01 AM MST | Wind Advisory | UNR | 16 hr |
| Nov 10, 8:03 AM MST | High Wind Warning | UNR | 39 hr |
| Nov 10, 1:10 PM MST | Wind Advisory | UNR | 40 hr |
| Nov 12, 1:20 PM MST | High Wind Watch | UNR | 13 hr |
| Nov 13, 2:05 AM MST | High Wind Warning | UNR | 18 hr |
| Nov 15, 1:31 AM MST | High Wind Watch | UNR | 13 hr |
| Nov 15, 1:46 AM MST | Fire Weather Watch | UNR | 13 hr |
| Nov 15, 2:25 PM MST | High Wind Warning | UNR | 51 hr |
| Nov 15, 2:28 PM MST | Red Flag Warning | UNR | 27 hr |
| Nov 30, 7:52 PM MST | Wind Advisory | UNR | 21 hr |
| Dec 4, 2:00 AM MST | High Wind Watch | UNR | 12 hr |
| Dec 4, 2:04 PM MST | High Wind Warning | UNR | 27 hr |
| Dec 14, 2:33 AM MST | High Wind Warning | UNR | 42 hr |
| Dec 14, 1:45 PM MST | Winter Weather Advisory | UNR | 30 hr |
| Dec 17, 2:09 AM MST | Wind Advisory | UNR | 16 hr |
| Dec 23, 9:51 AM MST | Wind Advisory | UNR | 18 hr |
| Dec 26, 10:12 AM MST | Winter Weather Advisory | UNR | 22 hr |
| Dec 27, 12:22 PM MST | Wind Chill Advisory | UNR | 20 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 | 25 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 19 |
| Flooding | |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 5 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 11 |
| High Wind Watch | 5 |
| Wind Advisory | 14 |
| Fire | |
| Red Flag Warning | 16 |
| Fire Weather Watch | 14 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.