Alert archive / South Dakota / Brown County
Weather alerts in Brown County, South Dakota, 2018
133 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Brown County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 133
- Warnings
- 24
- Watches
- 18
- Advisories
- 48
- Busiest month
- July26 alerts
- Busiest day
- July 3, 20189 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Brown County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 8 | 38% | 5 | 80% | 14 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Aberdeen, SD: tornado warnings | 7 | 2 | 71% | 9 | 33% | 8 min |
| NWS Aberdeen, SD: severe thunderstorm warnings | 233 | 158 | 32% | 290 | 82% | 17 min |
| NWS Aberdeen, SD: flash flood warnings | 12 | 11 | 8% | 16 | 69% | 142 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, 11:55 AM CST | Wind Chill Advisory | ABR | 22 hr |
| Jan 9, 4:18 AM CST | Winter Storm Watch | ABR | 23 hr |
| Jan 9, 4:18 AM CST | Winter Weather Advisory | ABR | 50 hr |
| Jan 11, 12:34 AM CST | Wind Chill Advisory | ABR | 34 hr |
| Jan 11, 11:42 AM CST | Wind Chill Advisory | ABR | 23 hr |
| Jan 14, 3:25 AM CST | Wind Chill Warning | ABR | 56 hr |
| Jan 14, 3:25 AM CST | Wind Chill Advisory | ABR | 56 hr |
| Jan 24, 3:35 AM CST | Dense Fog Advisory | ABR | 6 hr |
| Jan 24, 3:39 PM CST | Dense Fog Advisory | ABR | 18 hr |
| Feb 3, 3:19 AM CST | Wind Chill Advisory | ABR | 33 hr |
| Feb 9, 3:12 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Feb 18, 2:41 PM CST | Winter Weather Advisory | ABR | 43 hr |
| Feb 20, 2:53 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Feb 21, 2:38 PM CST | Winter Weather Advisory | ABR | 36 hr |
| Feb 23, 1:45 PM CST | Winter Weather Advisory | ABR | 31 hr |
| Feb 23, 11:20 PM CST | Dense Fog Advisory | ABR | 6 hr |
| Feb 28, 2:07 AM CST | Dense Fog Advisory | ABR | 8 hr |
| Mar 2, 2:58 PM CST | Winter Storm Watch | ABR | 47 hr |
| Mar 4, 4:40 AM CST | Winter Storm Warning | ABR | 55 hr |
| Mar 21, 3:52 PM CDT | Winter Storm Watch | ABR | 24 hr |
| Mar 22, 5:50 AM CDT | Dense Fog Advisory | ABR | 8 hr |
| Mar 22, 3:25 PM CDT | Winter Weather Advisory | ABR | 45 hr |
| Mar 25, 5:47 AM CDT | Winter Weather Advisory | ABR | 6 hr |
| Mar 25, 3:32 PM CDT | Winter Weather Advisory | ABR | 23 hr |
| Mar 30, 12:53 PM CDT | Winter Weather Advisory | ABR | 18 hr |
| Mar 30, 1:15 PM CDT | Wind Advisory | ABR | 21 hr |
| Apr 2, 4:12 AM CDT | Winter Weather Advisory | ABR | 36 hr |
| Apr 5, 2:46 AM CDT | Dense Fog Advisory | ABR | 7 hr |
| Apr 6, 3:34 PM CDT | Winter Weather Advisory | ABR | 53 hr |
| Apr 8, 2:03 PM CDT | Winter Storm Warning | ABR | 6 hr |
| Apr 10, 2:36 PM CDT | Winter Storm Watch | ABR | 49 hr |
| Apr 12, 11:48 AM CDT | Blizzard Warning | ABR | 55 hr |
| Apr 13, 1:58 PM CDT | Winter Weather Advisory | ABR | 19 hr |
| Apr 22, 1:09 AM CDT | River Flood Warning | ABR | 23 days |
| Apr 29, 3:52 AM CDT | Wind Advisory | ABR | 16 hr |
| Apr 30, 5:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 8, 2:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 8, 4:45 PM CDT | Severe Thunderstorm Warning | ABR | 31 min |
| May 17, 3:47 PM CDT | Mesoscale Discussion | SPC | 28 min |
| May 17, 4:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 17, 5:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| May 19, 3:46 PM CDT | Frost Advisory | ABR | 15 hr |
| May 23, 2:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| May 23, 5:06 PM CDT | Special Weather Statement | ABR | 24 min |
| May 23, 6:29 PM CDT | Special Weather Statement | ABR | 31 min |
| May 23, 6:43 PM CDT | Severe Thunderstorm Warning | ABR | 32 min |
| May 24, 2:36 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 1:59 AM CDT | Special Weather Statement | ABR | 31 min |
| May 28, 2:51 AM CDT | Special Weather Statement | ABR | 39 min |
| May 28, 3:21 AM CDT | Severe Thunderstorm Warning | ABR | 24 min |
| Jun 1, 8:36 PM CDT | High Wind Warning | ABR | 110 min |
| Jun 5, 6:01 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 11:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 6, 12:21 AM CDT | Severe Thunderstorm Warning | ABR | 39 min |
| Jun 6, 1:01 AM CDT | Severe Thunderstorm Warning | ABR | 12 min |
| Jun 12, 4:38 AM CDT | Dense Fog Advisory | ABR | 4 hr |
| Jun 14, 11:14 PM CDT | Severe Thunderstorm Warning | ABR | 46 min |
| Jun 16, 9:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 16, 3:00 PM CDT | Flash Flood Watch | ABR | 15 hr |
| Jun 16, 3:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 16, 3:38 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 16, 6:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 16, 10:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 2, 5:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 7:36 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 2, 8:42 PM CDT | Severe Thunderstorm Warning | ABR | 48 min |
| Jul 2, 9:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 3, 1:59 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 3:31 AM CDT | Heat Advisory | ABR | 16 hr |
| Jul 3, 4:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 3, 7:01 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 3, 6:16 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 3, 10:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 3, 11:02 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 4, 3:14 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 4, 3:15 AM CDT | Severe Thunderstorm Warning | ABR | 30 min |
| Jul 4, 3:41 AM CDT | Special Weather Statement | ABR | 34 min |
| Jul 6, 12:02 PM CDT | Special Weather Statement | ABR | 73 min |
| Jul 6, 2:53 PM CDT | Heat Advisory | ABR | 29 hr |
| Jul 7, 3:08 AM CDT | Heat Advisory | ABR | 41 hr |
| Jul 8, 3:52 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 5:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 8, 7:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 6:35 AM CDT | Special Weather Statement | ABR | 25 min |
| Jul 10, 3:06 PM CDT | Heat Advisory | ABR | 29 hr |
| Jul 22, 6:22 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 8:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 31, 6:40 PM CDT | Special Weather Statement | ABR | 35 min |
| Jul 31, 7:08 PM CDT | Severe Thunderstorm Warning | ABR | 27 min |
| Jul 31, 7:28 PM CDT | Special Weather Statement | ABR | 32 min |
| Jul 31, 8:24 PM CDT | Special Weather Statement | ABR | 36 min |
| Aug 4, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 23, 6:01 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 23, 8:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 23, 9:01 PM CDT | Severe Thunderstorm Warning | ABR | 17 min |
| Aug 23, 11:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 25, 5:17 AM CDT | Dense Fog Advisory | ABR | 6 hr |
| Aug 26, 5:42 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 26, 8:07 AM CDT | Severe Thunderstorm Warning | ABR | 38 min |
| Aug 26, 8:46 AM CDT | Severe Thunderstorm Warning | ABR | 59 min |
| Aug 26, 1:42 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 26, 6:15 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 26, 7:37 PM CDT | Tornado Watch | SPC | 5 hr |
| Aug 26, 8:20 PM CDT | Severe Thunderstorm Warning | ABR | 40 min |
| Sep 2, 12:51 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 2:34 AM CDT | Special Weather Statement | ABR | 41 min |
| Sep 9, 5:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 17, 9:40 AM CDT | Special Weather Statement | ABR | 20 min |
| Sep 23, 5:51 AM CDT | Dense Fog Advisory | ABR | 6 hr |
| Sep 27, 3:14 PM CDT | Frost Advisory | ABR | 18 hr |
| Sep 28, 3:48 AM CDT | Freeze Warning | ABR | 28 hr |
| Oct 3, 3:24 AM CDT | Freeze Watch | ABR | 11 hr |
| Oct 3, 3:24 AM CDT | Wind Advisory | ABR | 18 hr |
| Oct 3, 2:51 PM CDT | Freeze Warning | ABR | 18 hr |
| Oct 9, 4:51 AM CDT | Winter Weather Advisory | ABR | 38 hr |
| Nov 15, 3:08 PM CST | Winter Weather Advisory | ABR | 33 hr |
| Nov 22, 1:39 AM CST | Dense Fog Advisory | ABR | 10 hr |
| Nov 22, 6:13 PM CST | Dense Fog Advisory | ABR | 9 hr |
| Nov 27, 3:22 PM CST | Winter Weather Advisory | ABR | 27 hr |
| Nov 29, 8:25 PM CST | Dense Fog Advisory | ABR | 16 hr |
| Nov 30, 6:23 PM CST | Dense Fog Advisory | ABR | 9 hr |
| Dec 13, 1:36 AM CST | Winter Weather Advisory | ABR | 5 hr |
| Dec 20, 10:23 PM CST | Dense Fog Advisory | ABR | 13 hr |
| Dec 25, 3:45 AM CST | Winter Storm Watch | ABR | 11 hr |
| Dec 25, 2:28 PM CST | Winter Storm Warning | ABR | 37 hr |
| Dec 26, 3:16 PM CST | Blizzard Warning | ABR | 45 hr |
| Dec 28, 8:55 AM CST | Winter Weather Advisory | ABR | 3 hr |
| Dec 28, 2:07 PM CST | Wind Chill Advisory | ABR | 19 hr |
| Dec 30, 2:36 PM CST | Winter Weather Advisory | ABR | 27 hr |
| Dec 30, 7:09 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 31, 6:00 AM CST | Blizzard Warning | ABR | 12 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 | 13 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 12 |
| Flooding | |
| River Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Winter | |
| Blizzard Warning | 3 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 17 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 8 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.