Alert archive / South Dakota / Grant County
Weather alerts in Grant County, South Dakota, 2011
131 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 131
- Warnings
- 32
- Watches
- 28
- Advisories
- 45
- Busiest month
- July38 alerts
- Busiest day
- May 30, 201110 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 Grant County in 2011 had a tornado report inside them.
Grant County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 13 | 19% | 5 | 100% | 18 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 47 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Aberdeen, SD: tornado warnings | 23 | 5 | 78% | 11 | 45% | 8 min |
| NWS Aberdeen, SD: severe thunderstorm warnings | 224 | 147 | 34% | 242 | 85% | 21 min |
| NWS Aberdeen, SD: flash flood warnings | 18 | 9 | 50% | 17 | 71% | 202 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 1, 12:13 PM CST | Winter Weather Advisory | ABR | 4 hr |
| Jan 7, 1:15 PM CST | Winter Weather Advisory | ABR | 7 hr |
| Jan 18, 5:28 AM CST | Wind Chill Advisory | ABR | 7 hr |
| Jan 19, 3:33 PM CST | Winter Weather Advisory | ABR | 17 hr |
| Jan 20, 9:00 AM CST | Wind Chill Advisory | ABR | 12 hr |
| Jan 21, 3:15 AM CST | Wind Chill Advisory | ABR | 12 hr |
| Jan 22, 8:15 PM CST | Wind Chill Advisory | ABR | 4 hr |
| Jan 23, 8:17 AM CST | Wind Chill Advisory | ABR | 4 hr |
| Jan 29, 3:26 PM CST | Winter Weather Advisory | ABR | 46 hr |
| Jan 31, 10:46 AM CST | Wind Chill Advisory | ABR | 31 hr |
| Feb 1, 3:00 AM CST | Wind Chill Warning | ABR | 33 hr |
| Feb 4, 3:36 PM CST | Winter Weather Advisory | ABR | 28 hr |
| Feb 7, 3:42 AM CST | Wind Chill Advisory | ABR | 32 hr |
| Feb 8, 3:55 AM CST | Wind Chill Warning | ABR | 8 hr |
| Feb 8, 4:16 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Feb 8, 4:16 PM CST | Winter Weather Advisory | ABR | 12 hr |
| Feb 10, 3:22 AM CST | Wind Chill Advisory | ABR | 6 hr |
| Feb 12, 12:07 PM CST | High Wind Watch | ABR | 16 hr |
| Feb 13, 4:01 AM CST | High Wind Warning | ABR | 17 hr |
| Feb 13, 9:07 PM CST | Wind Advisory | ABR | 3 hr |
| Feb 17, 4:06 AM CST | Wind Advisory | ABR | 15 hr |
| Feb 18, 3:49 AM CST | Winter Storm Watch | ABR | 24 hr |
| Feb 19, 3:29 AM CST | Winter Storm Warning | ABR | 11 hr |
| Feb 19, 2:48 PM CST | Blizzard Warning | ABR | 37 hr |
| Feb 20, 9:17 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 8, 9:27 AM CST | Winter Weather Advisory | ABR | 18 hr |
| Mar 10, 5:35 AM CST | Dense Fog Advisory | ABR | 3 hr |
| Mar 11, 3:54 AM CST | Wind Advisory | ABR | 14 hr |
| Mar 11, 5:24 PM CST | Blizzard Warning | ABR | 13 hr |
| Mar 12, 8:57 AM CST | Winter Weather Advisory | ABR | 8 hr |
| Mar 20, 8:22 AM CDT | Dense Fog Advisory | ABR | 7 hr |
| Mar 22, 3:59 AM CDT | Winter Storm Watch | ABR | 7 hr |
| Mar 22, 10:34 AM CDT | Winter Storm Warning | ABR | 28 hr |
| Mar 22, 2:25 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 2, 2:59 PM CDT | Wind Advisory | ABR | 44 hr |
| Apr 9, 5:04 AM CDT | Dense Fog Advisory | ABR | 5 hr |
| Apr 14, 3:24 AM CDT | Winter Weather Advisory | ABR | 36 hr |
| Apr 29, 4:07 AM CDT | Wind Advisory | ABR | 15 hr |
| Apr 30, 4:14 AM CDT | Wind Advisory | ABR | 39 hr |
| May 8, 5:01 PM CDT | Severe Thunderstorm Warning | ABR | 24 min |
| May 9, 12:26 AM CDT | Severe Thunderstorm Warning | ABR | 36 min |
| May 9, 1:05 AM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| May 15, 3:23 PM CDT | Frost Advisory | ABR | 13 hr |
| May 29, 10:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 30, 2:46 AM CDT | Flash Flood Watch | ABR | 18 hr |
| May 30, 2:52 AM CDT | Mesoscale Discussion | SPC | 113 min |
| May 30, 2:59 AM CDT | High Wind Watch | ABR | 24 hr |
| May 30, 2:59 AM CDT | Wind Advisory | ABR | 11 hr |
| May 30, 4:05 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 30, 4:38 AM CDT | Severe Thunderstorm Warning | ABR | 20 min |
| May 30, 1:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 30, 3:52 PM CDT | Tornado Watch | SPC | 7 hr |
| May 30, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 30, 8:43 PM CDT | Tornado Watch | SPC | 5 hr |
| May 31, 2:29 AM CDT | Wind Advisory | ABR | 18 hr |
| Jun 16, 3:52 PM CDT | Flash Flood Watch | ABR | 30 hr |
| Jun 17, 4:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 17, 5:34 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 17, 7:39 PM CDT | Severe Thunderstorm Warning | ABR | 51 min |
| Jun 19, 3:38 AM CDT | Flash Flood Watch | ABR | 57 hr |
| Jun 26, 2:53 AM CDT | Severe Thunderstorm Warning | ABR | 27 min |
| Jun 29, 4:11 PM CDT | Heat Advisory | ABR | 27 hr |
| Jun 30, 10:07 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 1, 12:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 1, 2:08 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 4, 11:41 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 5, 12:49 AM CDT | Severe Thunderstorm Warning | ABR | 41 min |
| Jul 5, 12:57 AM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| Jul 5, 6:33 PM CDT | Areal Flood Warning | ABR | 23 hr |
| Jul 10, 2:29 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 10, 5:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 10, 5:47 PM CDT | Severe Thunderstorm Warning | ABR | 58 min |
| Jul 10, 6:47 PM CDT | Severe Thunderstorm Warning | ABR | 58 min |
| Jul 10, 6:56 PM CDT | Tornado Warning | ABR | 34 min |
| Jul 10, 7:36 PM CDT | Tornado Warning | ABR | 9 min |
| Jul 14, 11:53 AM CDT | Flash Flood Watch | ABR | 15 hr |
| Jul 15, 3:15 AM CDT | Excessive Heat Warning | ABR | 5 days |
| Jul 16, 6:47 AM CDT | Dense Fog Advisory | ABR | 3 hr |
| Jul 17, 6:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 22, 3:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 22, 5:25 PM CDT | Severe Thunderstorm Warning | ABR | 50 min |
| Jul 22, 5:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 22, 6:14 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 22, 6:43 PM CDT | Flash Flood Warning | ABR | 6 hr |
| Jul 22, 7:35 PM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| Jul 23, 1:25 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Jul 23, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 23, 4:38 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 25, 2:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 26, 7:24 PM CDT | Mesoscale Discussion | SPC | 36 min |
| Jul 26, 7:32 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 26, 8:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 26, 9:20 PM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| Jul 26, 9:56 PM CDT | Severe Thunderstorm Warning | ABR | 64 min |
| Jul 30, 5:47 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 30, 1:28 PM CDT | Severe Thunderstorm Watch | SPC | 112 min |
| Jul 30, 3:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 30, 3:56 PM CDT | Heat Advisory | ABR | 54 hr |
| Jul 30, 5:31 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 12:50 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 9:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 2, 5:04 AM CDT | Severe Thunderstorm Warning | ABR | 41 min |
| Aug 2, 5:23 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 6:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 1:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Aug 12, 1:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 12, 3:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 12, 7:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 18, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 23, 2:33 AM CDT | Severe Thunderstorm Warning | ABR | 42 min |
| Sep 13, 3:42 AM CDT | Freeze Watch | ABR | 12 hr |
| Sep 13, 3:20 PM CDT | Freeze Warning | ABR | 41 hr |
| Sep 19, 3:13 AM CDT | High Wind Watch | ABR | 12 hr |
| Sep 19, 3:03 PM CDT | High Wind Warning | ABR | 24 hr |
| Sep 19, 3:03 PM CDT | Wind Advisory | ABR | 31 hr |
| Oct 4, 3:14 PM CDT | Wind Advisory | ABR | 68 hr |
| Oct 6, 3:04 PM CDT | High Wind Warning | ABR | 29 hr |
| Nov 4, 3:38 AM CDT | Wind Advisory | ABR | 14 hr |
| Nov 4, 3:38 AM CDT | Wind Advisory | ABR | 39 hr |
| Nov 6, 3:19 AM CST | Wind Advisory | ABR | 15 hr |
| Nov 15, 3:35 AM CST | Wind Advisory | ABR | 13 hr |
| Nov 17, 2:46 PM CST | Winter Storm Watch | ABR | 25 hr |
| Nov 18, 2:43 PM CST | Winter Storm Warning | ABR | 24 hr |
| Nov 19, 6:11 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 25, 2:59 AM CST | Wind Advisory | ABR | 39 hr |
| Dec 6, 10:52 AM CST | Wind Advisory | ABR | 11 hr |
| Dec 14, 5:48 AM CST | Dense Fog Advisory | ABR | 5 hr |
| Dec 25, 3:09 PM CST | Wind Advisory | ABR | 29 hr |
| Dec 29, 9:45 PM CST | Freezing Rain Advisory | ABR | 5 hr |
| Dec 30, 2:09 PM CST | Wind Advisory | ABR | 52 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.