Alert archive / South Dakota / McCook County
Weather alerts in McCook County, South Dakota, 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.
McCook County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 88
- Warnings
- 29
- Watches
- 15
- Advisories
- 27
- Busiest month
- August15 alerts
- Busiest day
- June 14, 20174 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 McCook County in 2017 had a tornado report inside them.
McCook County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 23 | 17 | 26% | 4 | 100% | 13 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 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 | Winter Storm Warning | FSD | 32 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 Weather Advisory | FSD | 39 hr |
| Mar 23, 10:16 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Apr 3, 1:52 AM CDT | Dense Fog Advisory | FSD | 10 hr |
| Apr 7, 10:02 AM CDT | Wind Advisory | FSD | 9 hr |
| Apr 13, 4:45 AM CDT | Dense Fog Advisory | FSD | 5 hr |
| 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, 8:37 AM CDT | Severe Thunderstorm Warning | FSD | 23 min |
| May 15, 8:45 AM CDT | Severe Thunderstorm Warning | FSD | 30 min |
| May 15, 9:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 16, 2:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 11, 4:35 AM CDT | Severe Thunderstorm Warning | FSD | 40 min |
| Jun 11, 5:04 AM CDT | Severe Thunderstorm Warning | FSD | 41 min |
| Jun 13, 3:13 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 13, 5:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 6:59 PM CDT | Severe Thunderstorm Warning | FSD | 31 min |
| Jun 13, 7:32 PM CDT | Severe Thunderstorm Warning | FSD | 28 min |
| Jun 13, 7:53 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Jun 13, 8:23 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Jun 13, 8:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 22, 3:11 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 22, 5:44 AM CDT | Severe Thunderstorm Warning | FSD | 35 min |
| Jun 27, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 11, 4:26 AM CDT | Heat Advisory | FSD | 15 hr |
| Jul 11, 6:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 11, 6:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 11, 8:36 PM CDT | Severe Thunderstorm Warning | FSD | 24 min |
| Jul 11, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | 35 min |
| Jul 18, 3:07 PM CDT | Heat Advisory | FSD | 29 hr |
| Jul 19, 10:24 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 19, 12:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:25 PM CDT | Heat Advisory | FSD | 29 hr |
| Jul 21, 10:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 22, 1:27 AM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Jul 25, 2:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 3:22 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 25, 6:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 13, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Aug 13, 4:24 PM CDT | Severe Thunderstorm Warning | FSD | 36 min |
| Aug 13, 6:44 PM CDT | Severe Thunderstorm Warning | FSD | 31 min |
| Aug 13, 6:58 PM CDT | Tornado Warning | FSD | 17 min |
| Aug 13, 7:14 PM CDT | Severe Thunderstorm Warning | FSD | 31 min |
| Aug 13, 7:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 14, 3:52 AM CDT | Dense Fog Advisory | FSD | 6 hr |
| Aug 21, 8:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 11:06 AM CDT | Severe Thunderstorm Warning | FSD | 39 min |
| Aug 21, 11:12 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 21, 11:33 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 2:57 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 25, 3:38 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 5:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 7:28 PM CDT | Severe Thunderstorm Warning | FSD | 47 min |
| Sep 15, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | 45 min |
| Sep 19, 3:37 PM CDT | Tornado Watch | SPC | 8 hr |
| Sep 19, 10:39 PM CDT | Severe Thunderstorm Warning | FSD | 36 min |
| Sep 19, 11:04 PM CDT | Tornado Warning | FSD | 26 min |
| Sep 19, 11:08 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| Sep 22, 3:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 22, 5:00 PM CDT | Severe Thunderstorm Warning | FSD | 30 min |
| Sep 22, 5:48 PM CDT | Severe Thunderstorm Warning | FSD | 27 min |
| Sep 23, 12:27 PM CDT | Severe Thunderstorm Warning | FSD | 33 min |
| Oct 8, 3:28 AM CDT | Freeze Watch | FSD | 24 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 |
| Dec 3, 4:14 AM CST | Winter Storm Watch | FSD | 12 hr |
| Dec 3, 3:46 PM CST | Winter Weather 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 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 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 | 23 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 17 |
| Winter | |
| Winter Storm Warning | 2 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
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.