Alert archive / South Dakota / Clark County
Weather alerts in Clark County, South Dakota, 2015
111 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clark County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 111
- Warnings
- 25
- Watches
- 20
- Advisories
- 42
- Busiest month
- July25 alerts
- Busiest day
- June 22, 20156 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 2 tornado warnings covering Clark County in 2015 had a tornado report inside them.
Clark County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 14 | 12 | 14% | 7 | 100% | 23 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 3:54 PM CST | Wind Chill Advisory | ABR | 68 hr |
| Jan 3, 9:56 AM CST | Wind Advisory | ABR | 11 hr |
| Jan 4, 3:01 PM CST | Winter Weather Advisory | ABR | 28 hr |
| Jan 5, 3:17 PM CST | Wind Chill Advisory | ABR | 20 hr |
| Jan 6, 4:06 AM CST | Wind Chill Warning | ABR | 32 hr |
| Jan 7, 4:35 PM CST | Blizzard Watch | ABR | 12 hr |
| Jan 7, 4:35 PM CST | Winter Weather Advisory | ABR | 29 hr |
| Jan 8, 12:25 PM CST | Blizzard Warning | ABR | 6 hr |
| Jan 8, 12:25 PM CST | Winter Weather Advisory | ABR | 12 hr |
| Jan 8, 2:59 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Jan 11, 7:08 PM CST | Wind Chill Advisory | ABR | 15 hr |
| Jan 12, 3:25 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Jan 16, 3:07 PM CST | Wind Advisory | ABR | 25 hr |
| Jan 16, 10:33 PM CST | Freezing Rain Advisory | ABR | 7 hr |
| Jan 28, 10:34 AM CST | Wind Advisory | ABR | 14 hr |
| Feb 7, 3:13 PM CST | Freezing Rain Advisory | ABR | 24 hr |
| Feb 9, 2:15 PM CST | Freezing Rain Advisory | ABR | 22 hr |
| Feb 11, 2:47 AM CST | Wind Chill Advisory | ABR | 30 hr |
| Feb 13, 2:56 PM CST | Wind Chill Advisory | ABR | 21 hr |
| Feb 17, 3:36 AM CST | Wind Chill Advisory | ABR | 32 hr |
| Feb 20, 3:21 PM CST | Wind Chill Advisory | ABR | 64 hr |
| Feb 25, 2:55 PM CST | Wind Chill Advisory | ABR | 21 hr |
| Mar 1, 9:53 PM CST | Blizzard Watch | ABR | 17 hr |
| Mar 2, 2:31 PM CST | Blizzard Warning | ABR | 22 hr |
| Mar 2, 2:31 PM CST | Winter Weather Advisory | ABR | 27 hr |
| Mar 3, 3:07 PM CST | Wind Chill Advisory | ABR | 18 hr |
| Mar 25, 3:34 AM CDT | Wind Advisory | ABR | 14 hr |
| Mar 28, 4:16 AM CDT | Wind Advisory | ABR | 39 hr |
| Apr 2, 10:56 AM CDT | Wind Advisory | ABR | 8 hr |
| Apr 20, 3:33 AM CDT | Wind Advisory | ABR | 15 hr |
| May 10, 12:47 PM CDT | Special Weather Statement | ABR | 28 min |
| May 10, 3:19 PM CDT | Severe Thunderstorm Warning | ABR | 26 min |
| May 10, 3:44 PM CDT | Severe Thunderstorm Warning | ABR | 46 min |
| May 11, 3:27 PM CDT | Frost Advisory | ABR | 17 hr |
| May 16, 2:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 17, 3:44 AM CDT | Wind Advisory | ABR | 27 hr |
| May 18, 3:50 AM CDT | Freeze Warning | ABR | 28 hr |
| Jun 6, 3:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 6, 5:05 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 6, 6:22 PM CDT | Severe Thunderstorm Warning | ABR | 23 min |
| Jun 9, 3:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 9, 4:49 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 9, 5:07 PM CDT | Severe Thunderstorm Warning | ABR | 53 min |
| Jun 14, 7:34 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 4:02 PM CDT | Flash Flood Watch | ABR | 11 hr |
| Jun 21, 10:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 2:25 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 3:16 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 22, 3:31 AM CDT | Severe Thunderstorm Warning | ABR | 44 min |
| Jun 22, 4:33 AM CDT | Severe Thunderstorm Warning | ABR | 42 min |
| Jun 22, 4:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 4:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 27, 5:11 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 1:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 5, 7:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 5, 8:58 PM CDT | Flash Flood Watch | ABR | 6 hr |
| Jul 11, 4:05 AM CDT | Heat Advisory | ABR | 39 hr |
| Jul 11, 5:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 11, 9:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 16, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 17, 1:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 6:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 7:44 PM CDT | Severe Thunderstorm Warning | ABR | 61 min |
| Jul 17, 7:55 PM CDT | Severe Thunderstorm Warning | ABR | 50 min |
| Jul 17, 8:10 PM CDT | Tornado Warning | ABR | 65 min |
| Jul 17, 8:22 PM CDT | Severe Thunderstorm Warning | ABR | 38 min |
| Jul 17, 8:58 PM CDT | Tornado Warning | ABR | 62 min |
| Jul 17, 9:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 25, 4:03 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 25, 6:46 PM CDT | Severe Thunderstorm Warning | ABR | 59 min |
| Jul 25, 7:36 PM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jul 27, 9:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 10:49 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 28, 1:23 AM CDT | Severe Thunderstorm Warning | ABR | 56 min |
| Jul 28, 1:57 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 3:00 AM CDT | Wind Advisory | ABR | 8 hr |
| Aug 1, 3:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Aug 1, 6:04 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Aug 6, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 7, 5:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Aug 9, 1:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 9, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 9, 4:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Aug 9, 4:47 PM CDT | Severe Thunderstorm Warning | ABR | 43 min |
| Aug 9, 5:30 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Aug 14, 2:58 PM CDT | Heat Advisory | ABR | 30 hr |
| Aug 15, 6:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 21, 3:11 PM CDT | Wind Advisory | ABR | 43 hr |
| Oct 8, 2:51 PM CDT | Frost Advisory | ABR | 18 hr |
| Oct 11, 3:26 PM CDT | High Wind Warning | ABR | 21 hr |
| Oct 11, 3:26 PM CDT | Wind Advisory | ABR | 24 hr |
| Oct 15, 3:31 AM CDT | Freeze Warning | ABR | 30 hr |
| Oct 28, 3:33 AM CDT | Wind Advisory | ABR | 15 hr |
| Oct 31, 3:31 AM CDT | Wind Advisory | ABR | 15 hr |
| Nov 10, 2:57 PM CST | High Wind Watch | ABR | 24 hr |
| Nov 11, 3:13 PM CST | Wind Advisory | ABR | 26 hr |
| Nov 18, 3:50 AM CST | Wind Advisory | ABR | 38 hr |
| Nov 28, 3:38 PM CST | Winter Storm Watch | ABR | 24 hr |
| Nov 29, 3:18 PM CST | Winter Storm Warning | ABR | 42 hr |
| Nov 29, 3:18 PM CST | Winter Weather Advisory | ABR | 48 hr |
| Nov 30, 12:03 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 14, 3:42 AM CST | Winter Storm Watch | ABR | 24 hr |
| Dec 14, 2:45 PM CST | Winter Storm Warning | ABR | 45 hr |
| Dec 15, 4:55 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 15, 10:22 PM CST | Winter Weather Advisory | ABR | 20 hr |
| Dec 21, 6:32 AM CST | Dense Fog Advisory | ABR | 5 hr |
| Dec 24, 3:06 PM CST | Winter Storm Warning | ABR | 51 hr |
| Dec 24, 3:06 PM CST | Winter Weather Advisory | ABR | 12 hr |
| Dec 28, 2:47 AM CST | Winter Weather Advisory | ABR | 24 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 | 14 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 1 |
| Flooding | |
| Flash Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Warning | 3 |
| Blizzard Watch | 2 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 3 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 11 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 15 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
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.