Alert archive / Minnesota / Rock County
Weather alerts in Rock County, Minnesota, 2017
88 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rock County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 88
- Warnings
- 24
- Watches
- 16
- Advisories
- 30
- Busiest month
- June14 alerts
- Busiest day
- June 14, 20176 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Rock County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 17 | 13 | 24% | 7 | 71% | 29 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 36 | 6 | 83% | 13 | 62% | 16 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 270 | 214 | 21% | 354 | 87% | 19 min |
| NWS Sioux Falls, SD: flash flood warnings | 7 | 2 | 71% | 4 | 75% | 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 1, 3:47 AM CST | Winter Weather Advisory | FSD | 35 hr |
| Jan 3, 2:57 PM CST | Wind Chill Advisory | FSD | 21 hr |
| Jan 4, 3:11 PM CST | Wind Chill Advisory | FSD | 43 hr |
| Jan 12, 3:35 PM CST | Winter Storm Watch | FSD | 71 hr |
| Jan 15, 4:41 AM CST | Winter Weather Advisory | FSD | 43 hr |
| Jan 16, 1:53 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 19, 3:28 PM CST | Dense Fog Advisory | FSD | 46 hr |
| Jan 22, 2:33 PM CST | Winter Storm Watch | FSD | 24 hr |
| Jan 23, 2:59 PM CST | Winter Storm Warning | FSD | 51 hr |
| Jan 30, 3:25 AM CST | Wind Advisory | FSD | 18 hr |
| Feb 21, 3:59 PM CST | Winter Storm Watch | FSD | 36 hr |
| Feb 22, 3:22 PM CST | Blizzard Watch | FSD | 20 hr |
| Feb 23, 4:14 AM CST | Blizzard Warning | FSD | 37 hr |
| Feb 23, 11:54 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 5, 4:04 PM CST | High Wind Watch | FSD | 36 hr |
| Mar 5, 4:04 PM CST | Wind Advisory | FSD | 68 hr |
| Mar 6, 4:27 PM CST | Wind Advisory | FSD | 44 hr |
| Mar 11, 3:12 PM CST | Winter Storm Warning | FSD | 39 hr |
| Mar 11, 3:12 PM CST | Winter Weather Advisory | FSD | 39 hr |
| Mar 12, 7:14 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 23, 10:16 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Mar 26, 5:28 AM CDT | Dense Fog Advisory | FSD | 5 hr |
| Apr 3, 1:52 AM CDT | Dense Fog Advisory | FSD | 10 hr |
| Apr 9, 3:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 15, 2:06 AM CDT | Dense Fog Advisory | FSD | 4 hr |
| Apr 30, 3:49 AM CDT | Winter Weather Advisory | FSD | 30 hr |
| May 15, 9:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 15, 11:54 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 16, 2:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| May 17, 2:53 PM CDT | Tornado Watch | SPC | 6 hr |
| May 28, 6:53 PM CDT | Severe Thunderstorm Warning | FSD | 21 min |
| May 28, 7:33 PM CDT | Severe Thunderstorm Warning | FSD | 27 min |
| Jun 12, 10:28 AM CDT | Severe Thunderstorm Warning | FSD | 47 min |
| Jun 12, 10:38 AM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Jun 12, 11:09 AM CDT | Severe Thunderstorm Warning | FSD | 36 min |
| Jun 12, 11:28 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 13, 3:46 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 7:01 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 13, 8:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 13, 8:41 PM CDT | Severe Thunderstorm Warning | FSD | 34 min |
| Jun 13, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | 47 min |
| Jun 13, 9:18 PM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| Jun 13, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | 47 min |
| Jun 22, 3:11 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 27, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 11:02 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Jul 11, 6:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 19, 12:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 12:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 3:25 PM CDT | Heat Advisory | FSD | 29 hr |
| Aug 1, 4:16 PM CDT | Severe Thunderstorm Warning | FSD | 29 min |
| Aug 13, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Aug 13, 5:42 PM CDT | Severe Thunderstorm Warning | FSD | 33 min |
| Aug 13, 7:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 13, 8:49 PM CDT | Severe Thunderstorm Warning | FSD | 26 min |
| Aug 14, 3:52 AM CDT | Dense Fog Advisory | FSD | 6 hr |
| Aug 15, 4:24 AM CDT | Dense Fog Advisory | FSD | 5 hr |
| Aug 18, 2:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 21, 11:12 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 21, 11:33 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 2:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 25, 3:38 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 31, 5:06 AM CDT | Dense Fog Advisory | FSD | 5 hr |
| Sep 19, 10:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Sep 19, 10:36 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 19, 11:08 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| Sep 19, 11:29 PM CDT | Severe Thunderstorm Warning | FSD | 46 min |
| Sep 19, 11:47 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Sep 22, 10:35 AM CDT | Heat Advisory | FSD | 7 hr |
| Sep 22, 3:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 24, 3:08 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Oct 2, 2:22 PM CDT | Flash Flood Watch | FSD | 13 hr |
| Oct 9, 3:06 AM CDT | Freeze Warning | FSD | 30 hr |
| Oct 22, 3:21 PM CDT | Wind Advisory | FSD | 51 hr |
| Oct 25, 3:05 PM CDT | Wind Advisory | FSD | 51 hr |
| Nov 28, 1:24 PM CST | Red Flag Warning | FSD | 4 hr |
| Dec 3, 3:46 PM CST | Winter Weather Advisory | FSD | 32 hr |
| Dec 3, 3:59 PM CST | Wind Advisory | FSD | 32 hr |
| Dec 11, 2:59 AM CST | Wind Advisory | FSD | 15 hr |
| Dec 12, 2:43 PM CST | Wind Advisory | FSD | 27 hr |
| Dec 17, 3:13 AM CST | Dense Fog Advisory | FSD | 7 hr |
| Dec 21, 9:48 AM CST | Winter Weather Advisory | FSD | 13 hr |
| Dec 25, 4:29 AM CST | Wind Chill Advisory | FSD | 32 hr |
| Dec 26, 2:31 PM CST | Wind Chill Advisory | FSD | 20 hr |
| Dec 29, 2:18 AM CST | Winter Weather Advisory | FSD | 14 hr |
| Dec 29, 3:50 PM CST | Wind Chill Warning | FSD | 20 hr |
| Dec 29, 3:50 PM CST | Wind Chill Advisory | FSD | 32 hr |
| Dec 30, 2:59 AM CST | Wind Chill Warning | FSD | 57 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 | 17 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 18 |
| Flooding | |
| Flash Flood Watch | 1 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 2 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.