Alert archive / South Dakota / Dewey County
Weather alerts in Dewey County, South Dakota, 2015
101 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Dewey County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 101
- Warnings
- 32
- Watches
- 11
- Advisories
- 40
- Busiest month
- July22 alerts
- Busiest day
- June 22, 20157 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Dewey County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 21 | 14 | 33% | 10 | 100% | 24 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Aberdeen, SD: tornado warnings | 19 | 4 | 79% | 5 | 80% | 9 min |
| NWS Aberdeen, SD: severe thunderstorm warnings | 205 | 150 | 27% | 308 | 85% | 22 min |
| NWS Aberdeen, SD: flash flood warnings | 9 | 6 | 33% | 10 | 100% | 68 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 2:54 PM MST | Wind Chill Advisory | ABR | 68 hr |
| Jan 3, 8:56 AM MST | Wind Advisory | ABR | 11 hr |
| Jan 4, 2:01 PM MST | Winter Weather Advisory | ABR | 28 hr |
| Jan 5, 2:17 PM MST | Wind Chill Advisory | ABR | 20 hr |
| Jan 6, 3:06 AM MST | Wind Chill Advisory | ABR | 32 hr |
| Jan 7, 3:35 PM MST | Winter Weather Advisory | ABR | 29 hr |
| Jan 8, 1:59 PM MST | Wind Chill Advisory | ABR | 19 hr |
| Jan 16, 2:07 PM MST | Wind Advisory | ABR | 25 hr |
| Jan 24, 2:31 AM MST | Wind Advisory | ABR | 16 hr |
| Jan 28, 9:34 AM MST | Wind Advisory | ABR | 14 hr |
| Feb 9, 12:05 AM MST | Dense Fog Advisory | ABR | 17 hr |
| Feb 9, 1:15 PM MST | Freezing Rain Advisory | ABR | 22 hr |
| Feb 9, 6:36 PM MST | Dense Fog Advisory | ABR | 7 hr |
| Feb 10, 1:55 AM MST | Wind Advisory | ABR | 20 hr |
| Feb 17, 2:37 AM MST | Wind Advisory | ABR | 15 hr |
| Mar 2, 1:31 PM MST | Winter Weather Advisory | ABR | 27 hr |
| Mar 3, 2:07 PM MST | Wind Chill Advisory | ABR | 18 hr |
| Mar 28, 3:16 AM MDT | High Wind Warning | ABR | 30 hr |
| Mar 31, 2:21 PM MDT | Wind Advisory | ABR | 27 hr |
| Apr 2, 9:56 AM MDT | Wind Advisory | ABR | 8 hr |
| Apr 14, 10:11 AM MDT | Wind Advisory | ABR | 23 hr |
| Apr 19, 2:37 AM MDT | Wind Advisory | ABR | 11 hr |
| Apr 20, 2:33 AM MDT | Wind Advisory | ABR | 15 hr |
| May 8, 1:48 PM MDT | Winter Storm Watch | ABR | 13 hr |
| May 9, 2:46 AM MDT | Winter Storm Warning | ABR | 51 hr |
| May 11, 2:27 PM MDT | Frost Advisory | ABR | 17 hr |
| May 16, 1:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| May 17, 2:44 AM MDT | Wind Advisory | ABR | 27 hr |
| May 17, 4:20 AM MDT | Special Weather Statement | ABR | 40 min |
| May 17, 7:25 AM MDT | Areal Flood Advisory | ABR | 3 hr |
| May 17, 8:21 AM MDT | Areal Flood Warning | ABR | 6 hr |
| May 17, 1:54 PM MDT | Areal Flood Warning | ABR | 6 hr |
| May 17, 7:42 PM MDT | Areal Flood Warning | ABR | 12 hr |
| May 18, 2:50 AM MDT | Freeze Warning | ABR | 28 hr |
| May 28, 4:22 PM MDT | Severe Thunderstorm Warning | ABR | 38 min |
| May 28, 5:16 PM MDT | Special Weather Statement | ABR | 44 min |
| Jun 14, 4:01 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 4:29 AM MDT | Special Weather Statement | ABR | 46 min |
| Jun 14, 4:41 AM MDT | Severe Thunderstorm Warning | ABR | 64 min |
| Jun 19, 3:02 PM MDT | Flash Flood Watch | ABR | 11 hr |
| Jun 20, 4:53 PM MDT | Severe Thunderstorm Warning | ABR | 37 min |
| Jun 20, 8:36 PM MDT | Severe Thunderstorm Warning | ABR | 25 min |
| Jun 21, 2:23 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 21, 4:24 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 21, 7:32 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 21, 9:27 PM MDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jun 21, 9:41 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 10:25 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 22, 12:04 AM MDT | Severe Thunderstorm Warning | ABR | 41 min |
| Jun 22, 12:44 AM MDT | Severe Thunderstorm Warning | ABR | 46 min |
| Jun 22, 12:57 AM MDT | Severe Thunderstorm Warning | ABR | 44 min |
| Jun 30, 4:29 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 30, 10:19 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 4, 5:34 PM MDT | Special Weather Statement | ABR | 41 min |
| Jul 4, 5:52 PM MDT | Severe Thunderstorm Warning | ABR | 38 min |
| Jul 4, 6:28 PM MDT | Severe Thunderstorm Warning | ABR | 47 min |
| Jul 4, 6:57 PM MDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jul 4, 7:33 PM MDT | Severe Thunderstorm Warning | ABR | 42 min |
| Jul 4, 7:44 PM MDT | Severe Thunderstorm Warning | ABR | 46 min |
| Jul 4, 8:21 PM MDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jul 17, 5:02 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 24, 10:43 PM MDT | Severe Thunderstorm Warning | ABR | 47 min |
| Jul 24, 11:24 PM MDT | Severe Thunderstorm Warning | ABR | 51 min |
| Jul 25, 3:03 PM MDT | Tornado Watch | SPC | 7 hr |
| Jul 25, 3:18 PM MDT | Severe Thunderstorm Warning | ABR | 28 min |
| Jul 25, 4:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jul 27, 1:28 PM MDT | High Wind Watch | ABR | 13 hr |
| Jul 27, 5:51 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 6:31 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 7:45 PM MDT | Severe Thunderstorm Warning | ABR | 60 min |
| Jul 27, 8:19 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 27, 8:45 PM MDT | Special Weather Statement | ABR | 45 min |
| Jul 27, 9:17 PM MDT | Severe Thunderstorm Warning | ABR | 58 min |
| Jul 28, 2:46 AM MDT | Wind Advisory | ABR | 18 hr |
| Aug 8, 6:12 PM MDT | Severe Thunderstorm Warning | ABR | 48 min |
| Aug 8, 7:23 PM MDT | Severe Thunderstorm Warning | ABR | 52 min |
| Aug 8, 11:38 PM MDT | Special Weather Statement | ABR | 67 min |
| Aug 14, 1:58 PM MDT | Heat Advisory | ABR | 30 hr |
| Aug 21, 2:11 PM MDT | Wind Advisory | ABR | 43 hr |
| Aug 22, 9:45 AM MDT | High Wind Warning | ABR | 11 hr |
| Aug 27, 1:37 AM MDT | Mesoscale Discussion | SPC | 113 min |
| Oct 11, 2:11 AM MDT | Wind Advisory | ABR | 10 hr |
| Oct 11, 2:26 PM MDT | High Wind Warning | ABR | 21 hr |
| Oct 11, 2:26 PM MDT | Wind Advisory | ABR | 24 hr |
| Oct 12, 2:17 AM MDT | Wind Advisory | ABR | 12 hr |
| Oct 15, 2:31 AM MDT | Freeze Warning | ABR | 30 hr |
| Oct 28, 2:33 AM MDT | Wind Advisory | ABR | 15 hr |
| Oct 31, 2:31 AM MDT | Wind Advisory | ABR | 15 hr |
| Nov 10, 1:57 PM MST | High Wind Watch | ABR | 24 hr |
| Nov 11, 2:13 PM MST | Wind Advisory | ABR | 26 hr |
| Nov 16, 2:12 PM MST | High Wind Watch | ABR | 23 hr |
| Nov 17, 1:40 PM MST | High Wind Warning | ABR | 31 hr |
| Nov 18, 2:50 AM MST | Wind Advisory | ABR | 38 hr |
| Nov 29, 2:18 PM MST | Winter Weather Advisory | ABR | 48 hr |
| Dec 9, 3:09 AM MST | Wind Advisory | ABR | 34 hr |
| Dec 14, 2:42 AM MST | Winter Storm Watch | ABR | 24 hr |
| Dec 14, 1:45 PM MST | Winter Storm Warning | ABR | 45 hr |
| Dec 15, 3:55 PM MST | Mesoscale Discussion | SPC | 6 hr |
| Dec 15, 9:22 PM MST | Winter Weather Advisory | ABR | 20 hr |
| Dec 21, 5:32 AM MST | Dense Fog Advisory | ABR | 5 hr |
| Dec 25, 2:35 AM MST | Winter Weather Advisory | ABR | 35 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 | 21 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 12 |
| Special Weather Statement | 6 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 3 |
| Wind Advisory | 22 |
| 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 archive20142016
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.