Alert archive / South Dakota / Perkins County
Weather alerts in Perkins County, South Dakota, 2012
125 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Perkins County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 125
- Warnings
- 23
- Watches
- 17
- Advisories
- 46
- Busiest month
- July35 alerts
- Busiest day
- July 16, 20128 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Perkins County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 13 | 19% | 9 | 89% | 27 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Rapid City, SD: tornado warnings | 5 | 1 | 80% | 4 | 50% | 15 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 259 | 192 | 26% | 349 | 86% | 23 min |
| NWS Rapid City, SD: flash flood warnings | 5 | 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 2, 5:42 PM MST | Wind Advisory | UNR | 23 hr |
| Jan 10, 2:55 AM MST | Wind Advisory | UNR | 39 hr |
| Jan 13, 2:16 PM MST | Wind Advisory | UNR | 9 hr |
| Jan 21, 3:03 AM MST | Winter Weather Advisory | UNR | 38 hr |
| Jan 21, 2:30 PM MST | Winter Storm Warning | UNR | 22 hr |
| Jan 22, 10:26 AM MST | Wind Advisory | UNR | 7 hr |
| Jan 25, 3:29 AM MST | Wind Advisory | UNR | 18 hr |
| Jan 26, 3:03 PM MST | Wind Advisory | UNR | 23 hr |
| Feb 3, 10:44 PM MST | Dense Fog Advisory | UNR | 12 hr |
| Feb 9, 2:48 AM MST | Wind Advisory | UNR | 14 hr |
| Feb 21, 3:45 AM MST | High Wind Watch | UNR | 11 hr |
| Feb 21, 2:33 PM MST | High Wind Watch | UNR | 23 hr |
| Feb 21, 2:33 PM MST | Wind Advisory | UNR | 51 hr |
| Feb 22, 4:18 PM MST | Winter Weather Advisory | UNR | 16 hr |
| Feb 24, 3:36 PM MST | Wind Advisory | UNR | 47 hr |
| Feb 25, 10:06 AM MST | Wind Advisory | UNR | 8 hr |
| Feb 25, 2:54 PM MST | Winter Storm Watch | UNR | 47 hr |
| Feb 25, 3:09 PM MST | High Wind Warning | UNR | 19 hr |
| Feb 27, 1:54 PM MST | Winter Storm Warning | UNR | 41 hr |
| Feb 28, 1:43 PM MST | Mesoscale Discussion | SPC | 5 hr |
| Mar 2, 3:40 AM MST | Wind Advisory | UNR | 13 hr |
| Mar 3, 2:17 PM MST | Wind Advisory | UNR | 24 hr |
| Mar 19, 3:44 AM MDT | Wind Advisory | UNR | 16 hr |
| Mar 23, 3:00 AM MDT | Dense Fog Advisory | UNR | 8 hr |
| Mar 25, 2:40 PM MDT | High Wind Watch | UNR | 20 hr |
| Mar 26, 4:00 AM MDT | High Wind Warning | UNR | 34 hr |
| Mar 26, 2:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 26, 5:28 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 27, 9:54 AM MDT | Wind Advisory | UNR | 8 hr |
| Apr 1, 4:22 AM MDT | Wind Advisory | UNR | 38 hr |
| Apr 5, 2:57 PM MDT | Wind Advisory | UNR | 50 hr |
| Apr 11, 3:49 AM MDT | Wind Advisory | UNR | 17 hr |
| Apr 14, 3:09 PM MDT | Wind Advisory | UNR | 30 hr |
| Apr 21, 3:07 AM MDT | Wind Advisory | UNR | 15 hr |
| Apr 26, 4:14 AM MDT | Wind Advisory | UNR | 20 hr |
| May 2, 4:41 PM MDT | Special Weather Statement | UNR | 49 min |
| May 5, 2:48 PM MDT | Wind Advisory | UNR | 28 hr |
| May 7, 2:39 AM MDT | Wind Advisory | UNR | 15 hr |
| May 10, 2:15 AM MDT | Wind Advisory | UNR | 20 hr |
| May 10, 3:48 PM MDT | Mesoscale Discussion | SPC | 87 min |
| May 18, 2:45 PM MDT | Wind Advisory | UNR | 20 hr |
| May 22, 5:11 PM MDT | Mesoscale Discussion | SPC | 94 min |
| May 22, 7:21 PM MDT | Special Weather Statement | UNR | 24 min |
| May 27, 5:01 PM MDT | Special Weather Statement | UNR | 59 min |
| May 27, 6:15 PM MDT | Special Weather Statement | UNR | 60 min |
| May 27, 7:14 PM MDT | Special Weather Statement | UNR | 61 min |
| May 28, 3:41 AM MDT | Wind Advisory | UNR | 15 hr |
| Jun 5, 4:14 AM MDT | Wind Advisory | UNR | 16 hr |
| Jun 10, 1:05 AM MDT | Special Weather Statement | UNR | 55 min |
| Jun 10, 3:52 AM MDT | Wind Advisory | UNR | 32 hr |
| Jun 13, 1:28 PM MDT | Mesoscale Discussion | SPC | 62 min |
| Jun 13, 2:26 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 13, 7:51 PM MDT | Severe Thunderstorm Warning | UNR | 39 min |
| Jun 13, 8:13 PM MDT | Severe Thunderstorm Warning | UNR | 29 min |
| Jun 13, 8:14 PM MDT | Severe Thunderstorm Warning | UNR | 46 min |
| Jun 13, 8:34 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 15, 1:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 5:33 PM MDT | Special Weather Statement | UNR | 42 min |
| Jun 15, 6:24 PM MDT | Special Weather Statement | UNR | 51 min |
| Jun 22, 7:21 PM MDT | Special Weather Statement | UNR | 39 min |
| Jun 25, 3:05 PM MDT | Heat Advisory | UNR | 28 hr |
| Jun 25, 3:07 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 7:37 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 2:06 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jun 30, 2:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jun 30, 5:01 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Jul 1, 4:49 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 1, 6:35 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 1, 9:00 PM MDT | Severe Thunderstorm Warning | UNR | 60 min |
| Jul 1, 9:38 PM MDT | Severe Thunderstorm Warning | UNR | 56 min |
| Jul 3, 2:49 PM MDT | Wind Advisory | UNR | 21 hr |
| Jul 5, 4:10 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 5:37 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 5, 5:55 PM MDT | Tornado Watch | SPC | 6 hr |
| Jul 5, 8:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 11, 10:36 PM MDT | Special Weather Statement | UNR | 54 min |
| Jul 14, 6:19 PM MDT | Severe Thunderstorm Warning | UNR | 56 min |
| Jul 16, 2:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 16, 2:53 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 16, 3:48 PM MDT | Special Weather Statement | UNR | 42 min |
| Jul 16, 4:25 PM MDT | Special Weather Statement | UNR | 50 min |
| Jul 16, 4:40 PM MDT | Severe Thunderstorm Warning | UNR | 65 min |
| Jul 16, 4:53 PM MDT | Severe Thunderstorm Warning | UNR | 97 min |
| Jul 16, 5:53 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jul 16, 5:56 PM MDT | Special Weather Statement | UNR | 49 min |
| Jul 16, 6:34 PM MDT | Special Weather Statement | UNR | 56 min |
| Jul 16, 6:44 PM MDT | Severe Thunderstorm Warning | UNR | 91 min |
| Jul 16, 8:40 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 16, 8:46 PM MDT | Special Weather Statement | UNR | 59 min |
| Jul 17, 7:44 PM MDT | Severe Thunderstorm Warning | UNR | 91 min |
| Jul 17, 8:30 PM MDT | Severe Thunderstorm Warning | UNR | 69 min |
| Jul 18, 2:54 PM MDT | Heat Advisory | UNR | 54 hr |
| Jul 21, 4:25 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 21, 4:41 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 21, 8:27 PM MDT | Mesoscale Discussion | SPC | 63 min |
| Jul 23, 5:28 PM MDT | Severe Thunderstorm Warning | UNR | 62 min |
| Jul 23, 5:31 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 24, 4:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jul 24, 7:01 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 24, 11:02 PM MDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jul 24, 11:56 PM MDT | Severe Thunderstorm Warning | UNR | 64 min |
| Aug 2, 1:44 PM MDT | Mesoscale Discussion | SPC | 31 min |
| Aug 2, 2:03 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 2, 6:08 PM MDT | Severe Thunderstorm Warning | UNR | 67 min |
| Aug 2, 6:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Aug 7, 7:09 PM MDT | Special Weather Statement | UNR | 51 min |
| Aug 14, 3:01 PM MDT | Wind Advisory | UNR | 29 hr |
| Aug 29, 1:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Sep 10, 3:21 AM MDT | Wind Advisory | UNR | 33 hr |
| Sep 12, 2:20 PM MDT | Frost Advisory | UNR | 15 hr |
| Sep 18, 8:38 PM MDT | Wind Advisory | UNR | 17 hr |
| Sep 22, 2:11 AM MDT | Frost Advisory | UNR | 25 hr |
| Oct 2, 2:56 PM MDT | Wind Advisory | UNR | 33 hr |
| Oct 3, 2:03 PM MDT | Hard Freeze Warning | UNR | 18 hr |
| Oct 3, 2:03 PM MDT | Hard Freeze Warning | UNR | 41 hr |
| Oct 15, 3:04 AM MDT | High Wind Watch | UNR | 49 hr |
| Oct 16, 2:39 PM MDT | High Wind Warning | UNR | 51 hr |
| Nov 1, 4:10 AM MDT | Dense Fog Advisory | UNR | 10 hr |
| Nov 9, 2:55 PM MST | Winter Weather Advisory | UNR | 31 hr |
| Nov 10, 11:11 AM MST | Mesoscale Discussion | SPC | 4 hr |
| Nov 21, 3:21 AM MST | High Wind Watch | UNR | 11 hr |
| Nov 21, 2:22 PM MST | Wind Advisory | UNR | 29 hr |
| Dec 2, 3:23 PM MST | Wind Advisory | UNR | 26 hr |
| Dec 7, 1:52 PM MST | Winter Weather Advisory | UNR | 42 hr |
| Dec 13, 5:07 PM MST | Dense Fog Advisory | UNR | 16 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 | 16 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 16 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Hard Freeze Warning | 2 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 5 |
| Wind Advisory | 34 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.