Alert archive / South Dakota / Grant County
Weather alerts in Grant County, South Dakota, 2015
117 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Grant County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 117
- Warnings
- 24
- Watches
- 20
- Advisories
- 43
- Busiest month
- July30 alerts
- Busiest day
- June 22, 20159 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 4 tornado warnings covering Grant County in 2015 had a tornado report inside them.
Grant County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 0 | ||
| Severe thunderstorm warnings | 11 | 10 | 9% | 9 | 89% | 27 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 9, 2:40 PM CST | Wind Chill Advisory | ABR | 12 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 19, 3:24 AM CST | Freezing Rain Advisory | ABR | 3 hr |
| Jan 28, 10:34 AM CST | Wind Advisory | ABR | 14 hr |
| Feb 4, 11:30 AM CST | Winter Weather Advisory | ABR | 22 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 16, 2:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 16, 5:25 PM CDT | Tornado Watch | SPC | 5 hr |
| May 16, 7:11 PM CDT | Mesoscale Discussion | SPC | 94 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, 7:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 9, 3:16 PM CDT | Special Weather Statement | ABR | 44 min |
| Jun 9, 3:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 9, 3:24 PM CDT | Severe Thunderstorm Warning | ABR | 51 min |
| Jun 9, 4:09 PM CDT | Severe Thunderstorm Warning | ABR | 66 min |
| Jun 9, 4:49 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 9, 5:14 PM CDT | Severe Thunderstorm Warning | ABR | 23 min |
| Jun 14, 6:03 PM CDT | Special Weather Statement | ABR | 57 min |
| 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 21, 11:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 22, 1:17 AM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 22, 1:30 AM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Jun 22, 2:13 AM CDT | Severe Thunderstorm Warning | ABR | 47 min |
| Jun 22, 2:22 AM CDT | Severe Thunderstorm Warning | ABR | 53 min |
| 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, 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, 7:46 PM CDT | Severe Thunderstorm Warning | ABR | 44 min |
| 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 12, 3:53 PM CDT | Mesoscale Discussion | SPC | 82 min |
| Jul 12, 5:28 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 16, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 16, 5:42 PM CDT | Special Weather Statement | ABR | 63 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, 7:28 PM CDT | Severe Thunderstorm Warning | ABR | 62 min |
| Jul 17, 7:45 PM CDT | Tornado Warning | ABR | 45 min |
| Jul 17, 8:21 PM CDT | Tornado Warning | ABR | 54 min |
| Jul 17, 8:54 PM CDT | Tornado Warning | ABR | 66 min |
| Jul 17, 9:00 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Jul 17, 9:10 PM CDT | Tornado Warning | ABR | 52 min |
| Jul 17, 9:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 17, 9:57 PM CDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jul 24, 2:23 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 25, 4:03 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 25, 6:13 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 9:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 28, 1:57 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 2:48 AM CDT | Special Weather Statement | ABR | 57 min |
| 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, 7:31 AM CDT | Severe Thunderstorm Warning | ABR | 21 min |
| Aug 21, 3:11 PM CDT | Wind Advisory | ABR | 43 hr |
| Aug 22, 2:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| 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 |
| Nov 4, 7:51 AM CST | Dense Fog Advisory | ABR | 2 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 4, 11:11 AM CST | Wind Advisory | ABR | 16 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, 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 | 11 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 4 |
| Flooding | |
| Flash Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Warning | 3 |
| Blizzard Watch | 2 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 4 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 12 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 15 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
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.