Alert archive / South Dakota / Hand County
Weather alerts in Hand County, South Dakota, 2020
141 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Hand County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 141
- Warnings
- 44
- Watches
- 17
- Advisories
- 43
- Busiest month
- June37 alerts
- Busiest day
- July 5, 202013 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 1 tornado reports fell inside a warning.
Hand County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 1 | 0% | |||
| Severe thunderstorm warnings | 35 | 20 | 43% | 11 | 100% | 27 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Aberdeen, SD: tornado warnings | 11 | 3 | 73% | 16 | 19% | 6 min |
| NWS Aberdeen, SD: severe thunderstorm warnings | 262 | 160 | 39% | 356 | 78% | 19 min |
| NWS Aberdeen, SD: flash flood warnings | 4 | 1 | 75% | 1 | 100% | 205 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 4, 1:29 PM CST | Wind Advisory | ABR | 23 hr |
| Jan 10, 2:25 PM CST | Wind Chill Advisory | ABR | 22 hr |
| Jan 15, 3:54 AM CST | Wind Chill Advisory | ABR | 32 hr |
| Jan 15, 2:34 PM CST | Winter Storm Watch | ABR | 37 hr |
| Jan 16, 1:35 PM CST | Winter Weather Advisory | ABR | 31 hr |
| Jan 17, 3:48 AM CST | Blizzard Warning | ABR | 38 hr |
| Jan 18, 3:38 AM CST | Wind Chill Advisory | ABR | 32 hr |
| Jan 18, 10:05 AM CST | Winter Weather Advisory | ABR | 6 hr |
| Jan 26, 1:16 PM CST | Winter Weather Advisory | ABR | 11 hr |
| Jan 28, 8:10 PM CST | Dense Fog Advisory | ABR | 16 hr |
| Jan 29, 3:02 PM CST | Dense Fog Advisory | ABR | 21 hr |
| Feb 7, 10:45 AM CST | Winter Storm Watch | ABR | 24 hr |
| Feb 8, 10:28 AM CST | Winter Storm Warning | ABR | 21 hr |
| Feb 8, 7:46 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 11, 2:38 PM CST | Blizzard Warning | ABR | 21 hr |
| Feb 11, 2:38 PM CST | Wind Chill Warning | ABR | 43 hr |
| Feb 11, 2:38 PM CST | Wind Chill Advisory | ABR | 43 hr |
| Feb 11, 2:38 PM CST | Winter Weather Advisory | ABR | 27 hr |
| Feb 13, 9:38 AM CST | Wind Chill Advisory | ABR | 2 hr |
| Feb 17, 1:14 AM CST | Dense Fog Advisory | ABR | 8 hr |
| Feb 28, 9:20 PM CST | Dense Fog Advisory | ABR | 12 hr |
| Mar 4, 2:44 PM CST | Wind Advisory | ABR | 27 hr |
| Mar 19, 3:22 AM CDT | Wind Advisory | ABR | 21 hr |
| Mar 27, 8:56 AM CDT | Dense Fog Advisory | ABR | 3 hr |
| Apr 1, 4:00 AM CDT | Winter Weather Advisory | ABR | 51 hr |
| Apr 8, 3:14 AM CDT | Wind Advisory | ABR | 17 hr |
| Apr 9, 8:44 AM CDT | Snow Squall Warning | ABR | 61 min |
| Apr 10, 5:26 PM CDT | Winter Weather Advisory | ABR | 36 hr |
| Apr 20, 3:34 AM CDT | Wind Advisory | ABR | 15 hr |
| Apr 28, 5:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 8, 9:36 PM CDT | Wind Advisory | ABR | 23 hr |
| May 23, 7:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 4, 8:07 PM CDT | Severe Thunderstorm Warning | ABR | 38 min |
| Jun 6, 8:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 6, 9:11 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 6, 10:47 PM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jun 6, 10:52 PM CDT | Severe Thunderstorm Warning | ABR | 35 min |
| Jun 6, 11:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 7, 2:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 7, 3:31 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 7, 6:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 7, 7:15 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Jun 7, 8:15 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Jun 7, 8:30 PM CDT | Severe Thunderstorm Warning | ABR | 30 min |
| Jun 7, 8:59 PM CDT | Severe Thunderstorm Warning | ABR | 31 min |
| Jun 7, 9:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 7, 9:27 PM CDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jun 7, 10:11 PM CDT | Severe Thunderstorm Warning | ABR | 34 min |
| Jun 8, 5:56 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 16, 3:16 AM CDT | Wind Advisory | ABR | 18 hr |
| Jun 17, 5:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 6:29 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 7:21 PM CDT | Severe Thunderstorm Warning | ABR | 19 min |
| Jun 17, 8:21 PM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jun 17, 9:02 PM CDT | Severe Thunderstorm Warning | ABR | 17 min |
| Jun 17, 9:21 PM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jun 17, 9:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 11:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 18, 10:23 AM CDT | Areal Flood Warning | ABR | 6 hr |
| Jun 20, 1:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 20, 3:20 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 5:24 PM CDT | Severe Thunderstorm Warning | ABR | 36 min |
| Jun 20, 7:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 1:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 25, 2:31 PM CDT | Special Weather Statement | ABR | 44 min |
| Jun 25, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 3:41 PM CDT | Heat Advisory | ABR | 28 hr |
| Jun 30, 5:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 6:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 10:55 PM CDT | Severe Thunderstorm Warning | ABR | 26 min |
| Jul 4, 8:39 PM CDT | Severe Thunderstorm Warning | ABR | 51 min |
| Jul 4, 8:52 PM CDT | Severe Thunderstorm Warning | ABR | 68 min |
| Jul 4, 9:30 PM CDT | Severe Thunderstorm Warning | ABR | 60 min |
| Jul 4, 11:18 PM CDT | Areal Flood Warning | ABR | 12 hr |
| Jul 5, 12:00 AM CDT | Severe Thunderstorm Warning | ABR | 30 min |
| Jul 5, 12:45 AM CDT | Areal Flood Warning | ABR | 60 hr |
| Jul 5, 12:54 AM CDT | Special Weather Statement | ABR | 36 min |
| Jul 5, 12:34 PM CDT | Flash Flood Watch | ABR | 15 hr |
| Jul 5, 3:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 5, 4:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 5, 6:07 PM CDT | Severe Thunderstorm Warning | ABR | 53 min |
| Jul 5, 6:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 6:32 PM CDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jul 5, 7:15 PM CDT | Severe Thunderstorm Warning | ABR | 75 min |
| Jul 5, 8:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 6, 9:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 6, 11:13 PM CDT | Severe Thunderstorm Warning | ABR | 47 min |
| Jul 10, 9:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 16, 2:23 PM CDT | Heat Advisory | ABR | 30 hr |
| Jul 17, 10:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 12:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 20, 1:13 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 3:17 PM CDT | Special Weather Statement | ABR | 58 min |
| Jul 20, 3:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 20, 9:50 PM CDT | Special Weather Statement | ABR | 40 min |
| Jul 20, 10:36 PM CDT | Special Weather Statement | ABR | 39 min |
| Jul 23, 3:03 AM CDT | Heat Advisory | ABR | 65 hr |
| Jul 24, 3:21 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 24, 7:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 7:09 PM CDT | Special Weather Statement | ABR | 51 min |
| Jul 31, 7:53 PM CDT | Severe Thunderstorm Warning | ABR | 67 min |
| Jul 31, 8:02 PM CDT | Special Weather Statement | ABR | 43 min |
| Aug 6, 5:01 AM CDT | Dense Fog Advisory | ABR | 5 hr |
| Aug 8, 10:10 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 9, 12:29 AM CDT | Severe Thunderstorm Warning | ABR | 46 min |
| Aug 9, 1:07 AM CDT | Severe Thunderstorm Warning | ABR | 38 min |
| Aug 9, 1:46 AM CDT | Severe Thunderstorm Warning | ABR | 24 min |
| Aug 9, 1:46 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Aug 12, 12:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 13, 3:11 AM CDT | Heat Advisory | ABR | 16 hr |
| Aug 25, 3:23 AM CDT | Heat Advisory | ABR | 17 hr |
| Aug 26, 3:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 9:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 27, 10:20 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 27, 11:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 11:42 PM CDT | Severe Thunderstorm Warning | ABR | 78 min |
| Aug 30, 3:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 30, 4:54 PM CDT | Severe Thunderstorm Warning | ABR | 51 min |
| Aug 30, 4:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 30, 5:44 PM CDT | Severe Thunderstorm Warning | ABR | 46 min |
| Aug 30, 6:12 PM CDT | Severe Thunderstorm Warning | ABR | 32 min |
| Aug 30, 6:21 PM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Aug 30, 6:29 PM CDT | Severe Thunderstorm Warning | ABR | 33 min |
| Aug 30, 7:33 PM CDT | Severe Thunderstorm Warning | ABR | 30 min |
| Aug 30, 7:45 PM CDT | Severe Thunderstorm Warning | ABR | 22 min |
| Sep 2, 3:24 AM CDT | Wind Advisory | ABR | 24 hr |
| Sep 9, 12:52 PM CDT | Frost Advisory | ABR | 20 hr |
| Sep 29, 2:30 PM CDT | Wind Advisory | ABR | 30 hr |
| Oct 1, 3:10 AM CDT | Frost Advisory | ABR | 29 hr |
| Oct 3, 2:21 PM CDT | Frost Advisory | ABR | 19 hr |
| Oct 13, 3:52 PM CDT | Wind Advisory | ABR | 27 hr |
| Oct 21, 3:08 PM CDT | Winter Weather Advisory | ABR | 30 hr |
| Oct 23, 2:35 PM CDT | Winter Weather Advisory | ABR | 48 hr |
| Oct 30, 1:47 PM CDT | Wind Advisory | ABR | 30 hr |
| Nov 7, 1:21 PM CST | Wind Advisory | ABR | 29 hr |
| Nov 9, 8:14 AM CST | Winter Weather Advisory | ABR | 2 hr |
| Dec 21, 5:23 AM CST | Wind Advisory | ABR | 9 hr |
| Dec 21, 2:01 PM CST | High Wind Watch | ABR | 25 hr |
| Dec 22, 2:23 PM CST | Winter Weather Advisory | ABR | 24 hr |
| Dec 22, 2:31 PM CST | High Wind Warning | ABR | 24 hr |
| Dec 28, 3:56 AM CST | Winter Weather Advisory | ABR | 44 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 | 35 |
| Severe Thunderstorm Watch | 13 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 7 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Watch | 1 |
| Winter | |
| Blizzard Warning | 2 |
| Snow Squall Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Wind Chill Warning | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 13 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.