Alert archive / South Dakota / Hand County
Weather alerts in Hand County, South Dakota, 2011
122 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 122
- Warnings
- 39
- Watches
- 23
- Advisories
- 33
- Busiest month
- June23 alerts
- Busiest day
- June 14, 20116 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 3 tornado warnings covering Hand County in 2011 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.
Hand County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 2 | 0% | |
| Severe thunderstorm warnings | 21 | 17 | 19% | 11 | 100% | 18 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 597 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 11, 2:06 AM CST | Wind Chill Advisory | ABR | 10 hr |
| Jan 11, 3:24 PM CST | Wind Chill Advisory | ABR | 6 hr |
| Jan 16, 2:37 PM CST | Winter Weather Advisory | ABR | 19 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, 4:16 PM CST | Wind Chill Advisory | ABR | 19 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, 4:36 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 20, 9:17 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 23, 5:31 AM CST | Dense Fog Advisory | ABR | 5 hr |
| Feb 23, 2:20 PM CST | Winter Weather Advisory | ABR | 5 hr |
| Mar 8, 9:27 AM CST | Winter Weather Advisory | ABR | 18 hr |
| Mar 11, 3:54 AM CST | Wind Advisory | ABR | 14 hr |
| Mar 11, 5:24 PM CST | Blizzard Warning | ABR | 13 hr |
| Mar 19, 4:08 AM CDT | Wind Advisory | ABR | 15 hr |
| Mar 21, 10:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 21, 10:35 PM CDT | Severe Thunderstorm Warning | ABR | 25 min |
| Apr 2, 2:59 PM CDT | Wind Advisory | ABR | 44 hr |
| Apr 9, 5:04 AM CDT | Dense Fog Advisory | ABR | 5 hr |
| Apr 13, 3:42 AM CDT | Winter Storm Watch | ABR | 24 hr |
| Apr 14, 3:24 AM CDT | Winter Storm Warning | ABR | 43 hr |
| Apr 15, 7:13 PM CDT | Winter Storm Warning | ABR | 3 hr |
| Apr 21, 3:12 AM CDT | Wind Advisory | ABR | 12 hr |
| Apr 29, 4:07 AM CDT | Wind Advisory | ABR | 15 hr |
| Apr 30, 4:14 AM CDT | High Wind Warning | ABR | 18 hr |
| Apr 30, 4:14 AM CDT | Wind Advisory | ABR | 39 hr |
| May 9, 3:05 AM CDT | Severe Thunderstorm Warning | ABR | 25 min |
| May 15, 3:23 PM CDT | Frost Advisory | ABR | 13 hr |
| May 23, 4:54 PM CDT | Areal Flood Advisory | ABR | 6 hr |
| May 30, 2:59 AM CDT | High Wind Watch | ABR | 24 hr |
| May 30, 5:34 PM CDT | Severe Thunderstorm Warning | ABR | 26 min |
| May 30, 5:55 PM CDT | Tornado Warning | ABR | 35 min |
| May 30, 6:00 PM CDT | Severe Thunderstorm Warning | ABR | 14 min |
| May 30, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 31, 2:29 AM CDT | Wind Advisory | ABR | 18 hr |
| Jun 6, 8:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 12, 7:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 14, 3:40 PM CDT | Severe Thunderstorm Warning | ABR | 35 min |
| Jun 14, 3:57 PM CDT | Severe Thunderstorm Warning | ABR | 63 min |
| Jun 14, 4:29 PM CDT | Tornado Warning | ABR | 31 min |
| Jun 14, 4:41 PM CDT | Severe Thunderstorm Warning | ABR | 51 min |
| Jun 14, 4:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 14, 4:49 PM CDT | Tornado Warning | ABR | 26 min |
| Jun 14, 7:10 PM CDT | Areal Flood Warning | ABR | 11 hr |
| Jun 16, 3:52 PM CDT | Flash Flood Watch | ABR | 30 hr |
| Jun 19, 3:38 AM CDT | Flash Flood Watch | ABR | 57 hr |
| Jun 20, 4:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 20, 10:17 PM CDT | Flash Flood Warning | ABR | 11 hr |
| Jun 21, 10:01 AM CDT | Areal Flood Warning | ABR | 47 hr |
| Jun 24, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 3:33 PM CDT | Flash Flood Watch | ABR | 27 hr |
| Jun 25, 8:14 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 12:46 AM CDT | Severe Thunderstorm Warning | ABR | 44 min |
| Jun 26, 1:46 AM CDT | Severe Thunderstorm Warning | ABR | 29 min |
| Jun 26, 6:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 26, 12:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 26, 1:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 29, 4:11 PM CDT | Heat Advisory | ABR | 27 hr |
| Jun 30, 10:07 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 30, 10:46 PM CDT | Severe Thunderstorm Warning | ABR | 44 min |
| Jul 4, 4:20 AM CDT | Flash Flood Watch | ABR | 24 hr |
| Jul 4, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 4, 7:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 11:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 4, 11:41 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 4, 11:58 PM CDT | Severe Thunderstorm Warning | ABR | 62 min |
| Jul 8, 4:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 11:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 9, 6:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 14, 11:53 AM CDT | Flash Flood Watch | ABR | 15 hr |
| Jul 14, 3:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 3:15 AM CDT | Excessive Heat Warning | ABR | 5 days |
| Jul 25, 9:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 26, 10:45 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 26, 3:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 5:21 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 26, 7:28 PM CDT | Severe Thunderstorm Warning | ABR | 47 min |
| Jul 28, 3:31 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 30, 3:56 PM CDT | Heat Advisory | ABR | 54 hr |
| Aug 1, 9:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 2, 12:42 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 2, 1:28 AM CDT | Severe Thunderstorm Warning | ABR | 47 min |
| Aug 2, 2:10 AM CDT | Severe Thunderstorm Warning | ABR | 50 min |
| Aug 2, 2:35 AM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| Aug 2, 3:15 AM CDT | Severe Thunderstorm Warning | ABR | 19 min |
| Aug 5, 6:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 5, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 5, 10:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 3:05 PM CDT | Tornado Watch | SPC | 5 hr |
| Aug 11, 5:00 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Aug 11, 5:45 PM CDT | Severe Thunderstorm Warning | ABR | 45 min |
| Aug 14, 8:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 18, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 18, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 28, 5:16 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 5:51 AM CDT | Severe Thunderstorm Warning | ABR | 54 min |
| Aug 28, 6:46 AM CDT | Severe Thunderstorm Warning | ABR | 44 min |
| 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 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 22, 5:45 AM CST | Dense Fog Advisory | ABR | 4 hr |
| Nov 25, 2:59 AM CST | Wind Advisory | ABR | 39 hr |
| Dec 30, 3:46 AM CST | High Wind Watch | ABR | 10 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.