Alert archive / South Dakota / Todd County
Weather alerts in Todd County, South Dakota, 2018
145 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Todd County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 145
- Warnings
- 41
- Watches
- 22
- Advisories
- 22
- Busiest month
- June46 alerts
- Busiest day
- June 16, 201812 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Todd County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 32 | 22 | 31% | 17 | 82% | 25 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 Rapid City, SD: tornado warnings | 18 | 6 | 67% | 14 | 64% | 18 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 376 | 273 | 27% | 586 | 84% | 24 min |
| NWS Rapid City, SD: flash flood warnings | 13 | 8 | 38% | 16 | 69% | 42 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, 2:31 PM CST | Wind Chill Advisory | UNR | 19 hr |
| Jan 9, 3:23 AM CST | Winter Weather Advisory | UNR | 47 hr |
| Jan 14, 3:47 AM CST | Wind Chill Advisory | UNR | 55 hr |
| Jan 19, 3:57 AM CST | Winter Storm Watch | UNR | 24 hr |
| Jan 20, 3:53 AM CST | Winter Storm Warning | UNR | 48 hr |
| Feb 7, 3:42 PM CST | Winter Weather Advisory | UNR | 49 hr |
| Feb 9, 4:04 PM CST | Wind Chill Advisory | UNR | 18 hr |
| Feb 16, 3:11 PM CST | Winter Storm Watch | UNR | 48 hr |
| Feb 17, 2:55 PM CST | Winter Storm Warning | UNR | 64 hr |
| Feb 20, 2:45 PM CST | Wind Chill Advisory | UNR | 19 hr |
| Mar 2, 4:19 AM CST | Winter Storm Watch | UNR | 48 hr |
| Mar 3, 2:18 PM CST | Dense Fog Advisory | UNR | 22 hr |
| Mar 4, 4:22 AM CST | Blizzard Warning | UNR | 56 hr |
| Mar 14, 2:52 AM CDT | Winter Storm Watch | UNR | 37 hr |
| Mar 15, 4:21 AM CDT | Winter Storm Warning | UNR | 39 hr |
| Mar 16, 4:04 AM CDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 30, 3:24 PM CDT | Wind Advisory | UNR | 14 hr |
| Apr 2, 4:14 AM CDT | Winter Weather Advisory | UNR | 30 hr |
| Apr 5, 3:49 AM CDT | Winter Weather Advisory | UNR | 33 hr |
| Apr 10, 3:45 PM CDT | Winter Storm Watch | UNR | 44 hr |
| Apr 12, 4:16 AM CDT | Blizzard Warning | UNR | 57 hr |
| Apr 13, 4:52 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 13, 9:37 PM CDT | Special Weather Statement | UNR | 83 min |
| Apr 29, 1:49 AM CDT | Wind Advisory | UNR | 18 hr |
| May 7, 8:33 PM CDT | Special Weather Statement | UNR | 42 min |
| May 7, 8:47 PM CDT | Severe Thunderstorm Warning | UNR | 43 min |
| May 7, 9:06 PM CDT | Special Weather Statement | UNR | 24 min |
| May 7, 10:16 PM CDT | Special Weather Statement | UNR | 44 min |
| May 7, 10:44 PM CDT | Special Weather Statement | UNR | 46 min |
| May 17, 2:23 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| May 17, 8:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 17, 8:38 PM CDT | Severe Thunderstorm Warning | UNR | 67 min |
| May 17, 9:38 PM CDT | Severe Thunderstorm Warning | UNR | 82 min |
| May 17, 10:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 17, 10:49 PM CDT | Severe Thunderstorm Warning | UNR | 29 min |
| May 23, 8:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 27, 6:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 27, 6:27 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 27, 8:03 PM CDT | Severe Thunderstorm Warning | UNR | 57 min |
| May 27, 8:29 PM CDT | Severe Thunderstorm Warning | UNR | 31 min |
| May 27, 8:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 27, 8:44 PM CDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jun 1, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 3:36 PM CDT | Special Weather Statement | LBF | 39 min |
| Jun 1, 3:37 PM CDT | Severe Thunderstorm Warning | UNR | 19 min |
| Jun 1, 3:58 PM CDT | Severe Thunderstorm Warning | UNR | 47 min |
| Jun 1, 4:44 PM CDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 8, 5:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 8, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 8, 6:34 PM CDT | Severe Thunderstorm Warning | UNR | 56 min |
| Jun 8, 7:04 PM CDT | Severe Thunderstorm Warning | UNR | 56 min |
| Jun 8, 7:26 PM CDT | Severe Thunderstorm Warning | UNR | 64 min |
| Jun 8, 7:54 PM CDT | Severe Thunderstorm Warning | UNR | 66 min |
| Jun 8, 8:20 PM CDT | Severe Thunderstorm Warning | UNR | 55 min |
| Jun 8, 8:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 8, 9:14 PM CDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 11, 2:06 AM CDT | Severe Thunderstorm Warning | UNR | 39 min |
| Jun 11, 2:39 AM CDT | Severe Thunderstorm Warning | UNR | 36 min |
| Jun 13, 9:00 AM CDT | Special Weather Statement | UNR | 45 min |
| Jun 13, 10:17 AM CDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jun 13, 10:40 AM CDT | Severe Thunderstorm Warning | UNR | 65 min |
| Jun 13, 11:12 AM CDT | Special Weather Statement | UNR | 48 min |
| Jun 13, 11:14 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 13, 11:43 AM CDT | Severe Thunderstorm Warning | UNR | 37 min |
| Jun 13, 11:59 AM CDT | Special Weather Statement | LBF | 46 min |
| Jun 13, 1:30 PM CDT | Severe Thunderstorm Warning | UNR | 45 min |
| Jun 16, 12:33 AM CDT | Special Weather Statement | UNR | 27 min |
| Jun 16, 1:00 AM CDT | Special Weather Statement | UNR | 45 min |
| Jun 16, 1:21 AM CDT | Severe Thunderstorm Warning | UNR | 39 min |
| Jun 16, 1:50 AM CDT | Special Weather Statement | LBF | 40 min |
| Jun 16, 3:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 16, 3:37 PM CDT | Flash Flood Watch | UNR | 15 hr |
| Jun 16, 3:54 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 5:19 PM CDT | Special Weather Statement | UNR | 41 min |
| Jun 16, 5:29 PM CDT | Special Weather Statement | LBF | 31 min |
| Jun 16, 6:00 PM CDT | Special Weather Statement | UNR | 30 min |
| Jun 16, 6:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 6:47 PM CDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jun 16, 7:24 PM CDT | Special Weather Statement | UNR | 51 min |
| Jun 16, 7:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 8:14 PM CDT | Special Weather Statement | UNR | 46 min |
| Jun 16, 9:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 18, 2:46 PM CDT | Flash Flood Watch | UNR | 51 hr |
| Jun 22, 3:12 PM CDT | Flood Watch | UNR | 54 hr |
| Jun 26, 11:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 6:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 5:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 29, 6:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 6, 3:00 PM CDT | Heat Advisory | UNR | 53 hr |
| Jul 12, 2:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 3:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 5:32 PM CDT | Special Weather Statement | LBF | 43 min |
| Jul 12, 7:18 PM CDT | Areal Flood Advisory | UNR | 3 hr |
| Jul 16, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 16, 5:17 PM CDT | Special Weather Statement | UNR | 28 min |
| Jul 16, 5:45 PM CDT | Special Weather Statement | UNR | 45 min |
| Jul 16, 6:08 PM CDT | Severe Thunderstorm Warning | UNR | 52 min |
| Jul 16, 6:19 PM CDT | Special Weather Statement | UNR | 41 min |
| Jul 16, 6:42 PM CDT | Severe Thunderstorm Warning | UNR | 63 min |
| Jul 16, 7:44 PM CDT | Special Weather Statement | UNR | 31 min |
| Jul 16, 8:08 PM CDT | Special Weather Statement | UNR | 52 min |
| Jul 18, 1:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 3:43 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 18, 5:06 PM CDT | Severe Thunderstorm Warning | UNR | 39 min |
| Jul 18, 5:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 18, 8:03 PM CDT | Severe Thunderstorm Warning | UNR | 43 min |
| Jul 22, 5:19 PM CDT | Special Weather Statement | LBF | 41 min |
| Jul 22, 6:22 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 6:41 PM CDT | Severe Thunderstorm Warning | UNR | 64 min |
| Jul 22, 7:10 PM CDT | Special Weather Statement | LBF | 50 min |
| Jul 22, 7:15 PM CDT | Special Weather Statement | UNR | 15 min |
| Jul 22, 7:43 PM CDT | Severe Thunderstorm Warning | UNR | 62 min |
| Jul 22, 8:14 PM CDT | Special Weather Statement | LBF | 46 min |
| Jul 22, 8:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 22, 8:37 PM CDT | Severe Thunderstorm Warning | UNR | 53 min |
| Jul 27, 4:52 PM CDT | Special Weather Statement | UNR | 23 min |
| Jul 27, 4:59 PM CDT | Severe Thunderstorm Warning | UNR | 34 min |
| Jul 27, 5:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 5:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 15, 9:03 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 2:45 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 23, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Aug 23, 6:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 27, 3:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 27, 6:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 27, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 11, 6:35 PM CDT | Special Weather Statement | LBF | 40 min |
| Sep 11, 8:08 PM CDT | Special Weather Statement | UNR | 37 min |
| Oct 3, 4:29 AM CDT | Freeze Watch | UNR | 11 hr |
| Oct 3, 4:29 AM CDT | Wind Advisory | UNR | 15 hr |
| Oct 3, 3:18 PM CDT | Freeze Warning | UNR | 18 hr |
| Oct 9, 5:02 AM CDT | Winter Weather Advisory | UNR | 31 hr |
| Oct 18, 10:06 AM CDT | Wind Advisory | UNR | 9 hr |
| Nov 16, 9:40 PM CST | Winter Weather Advisory | UNR | 8 hr |
| Nov 23, 3:25 PM CST | Winter Weather Advisory | UNR | 36 hr |
| Nov 28, 2:36 PM CST | Winter Storm Watch | UNR | 38 hr |
| Nov 29, 3:01 PM CST | Winter Storm Warning | UNR | 66 hr |
| Nov 29, 9:05 PM CST | Dense Fog Advisory | UNR | 11 hr |
| Dec 1, 2:17 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 18, 3:18 PM CST | Wind Advisory | UNR | 27 hr |
| Dec 24, 2:58 PM CST | Winter Storm Watch | UNR | 24 hr |
| Dec 25, 3:50 AM CST | Winter Weather Advisory | UNR | 3 days |
| Dec 25, 3:03 PM CST | Winter Storm Warning | UNR | 39 hr |
| Dec 26, 3:32 PM CST | Blizzard Warning | UNR | 38 hr |
| Dec 29, 3:19 PM CST | Winter Weather Advisory | UNR | 51 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 | 32 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 30 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Blizzard Warning | 3 |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
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.