Alert archive / South Dakota / Lawrence County
Weather alerts in Lawrence County, South Dakota, 2017
151 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lawrence County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 151
- Warnings
- 27
- Watches
- 12
- Advisories
- 41
- Busiest month
- June31 alerts
- Busiest day
- June 11, 20179 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lawrence County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 19 | 10 | 47% | 8 | 75% | 18 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 Rapid City, SD: tornado warnings | 4 | 1 | 75% | 3 | 33% | 21 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 183 | 121 | 34% | 257 | 88% | 27 min |
| NWS Rapid City, SD: flash flood warnings | 4 | 1 | 75% | 1 | 100% | 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 1, 1:37 PM MST | Winter Weather Advisory | UNR | 28 hr |
| Jan 3, 9:58 AM MST | Wind Chill Advisory | UNR | 71 hr |
| Jan 9, 2:14 PM MST | Winter Weather Advisory | UNR | 21 hr |
| Jan 22, 1:56 PM MST | Winter Storm Watch | UNR | 24 hr |
| Jan 23, 1:38 PM MST | Winter Storm Warning | UNR | 39 hr |
| Jan 23, 1:38 PM MST | Winter Weather Advisory | UNR | 39 hr |
| Jan 28, 3:24 AM MST | Wind Advisory | UNR | 14 hr |
| Jan 29, 5:35 AM MST | Wind Advisory | UNR | 7 hr |
| Jan 30, 2:22 AM MST | Wind Advisory | UNR | 13 hr |
| Jan 31, 11:49 AM MST | Winter Storm Warning | UNR | 23 hr |
| Jan 31, 11:49 AM MST | Winter Weather Advisory | UNR | 23 hr |
| Feb 1, 2:57 AM MST | Winter Storm Watch | UNR | 12 hr |
| Feb 1, 2:54 PM MST | Winter Weather Advisory | UNR | 31 hr |
| Feb 7, 1:48 PM MST | Winter Weather Advisory | UNR | 15 hr |
| Feb 20, 8:33 PM MST | Wind Advisory | UNR | 18 hr |
| Feb 21, 2:46 PM MST | Winter Storm Watch | UNR | 24 hr |
| Feb 22, 2:34 PM MST | Winter Storm Warning | UNR | 37 hr |
| Feb 22, 2:34 PM MST | Winter Weather Advisory | UNR | 37 hr |
| Mar 5, 3:06 AM MST | High Wind Watch | UNR | 231 days |
| Mar 5, 3:15 AM MST | Winter Weather Advisory | UNR | 36 hr |
| Mar 6, 3:02 AM MST | High Wind Watch | UNR | 233 days |
| Mar 7, 3:16 AM MST | Wind Advisory | UNR | 16 hr |
| Mar 9, 2:29 PM MST | Winter Weather Advisory | UNR | 30 hr |
| Mar 11, 1:45 PM MST | Wind Advisory | UNR | 30 hr |
| Mar 20, 2:20 PM MDT | Winter Weather Advisory | UNR | 16 hr |
| Mar 21, 4:43 PM MDT | Dense Fog Advisory | UNR | 109 min |
| Mar 21, 6:32 PM MDT | Freezing Fog Advisory | UNR | 4 hr |
| Apr 2, 1:50 PM MDT | Winter Weather Advisory | UNR | 22 hr |
| Apr 7, 2:55 PM MDT | Winter Storm Watch | UNR | 37 hr |
| Apr 9, 3:31 AM MDT | Winter Storm Warning | UNR | 27 hr |
| Apr 9, 3:31 AM MDT | Winter Weather Advisory | UNR | 29 hr |
| Apr 17, 8:24 PM MDT | Special Weather Statement | UNR | 36 min |
| Apr 17, 8:40 PM MDT | Severe Thunderstorm Warning | UNR | 65 min |
| Apr 24, 4:14 AM MDT | Winter Storm Watch | UNR | 11 hr |
| Apr 24, 2:46 PM MDT | Winter Weather Advisory | UNR | 24 hr |
| Apr 30, 2:01 PM MDT | Wind Advisory | UNR | 29 hr |
| May 7, 2:28 PM MDT | Special Weather Statement | UNR | 32 min |
| May 7, 2:46 PM MDT | Severe Thunderstorm Warning | UNR | 29 min |
| May 7, 3:26 PM MDT | Special Weather Statement | UNR | 34 min |
| May 7, 5:35 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 7, 6:21 PM MDT | Special Weather Statement | UNR | 24 min |
| May 8, 1:07 AM MDT | Special Weather Statement | UNR | 53 min |
| May 13, 4:41 PM MDT | Mesoscale Discussion | SPC | 64 min |
| May 13, 6:21 PM MDT | Special Weather Statement | UNR | 24 min |
| May 13, 6:43 PM MDT | Special Weather Statement | UNR | 32 min |
| May 15, 3:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| May 15, 4:40 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 15, 6:34 PM MDT | Mesoscale Discussion | SPC | 56 min |
| May 15, 9:53 PM MDT | Mesoscale Discussion | SPC | 67 min |
| May 20, 2:29 PM MDT | Frost Advisory | UNR | 12 hr |
| May 28, 2:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 5, 1:01 PM MDT | Special Weather Statement | UNR | 29 min |
| Jun 5, 2:23 PM MDT | Special Weather Statement | UNR | 52 min |
| Jun 5, 2:37 PM MDT | Severe Thunderstorm Warning | UNR | 53 min |
| Jun 5, 2:55 PM MDT | Severe Thunderstorm Warning | UNR | 50 min |
| Jun 5, 4:01 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jun 5, 5:50 PM MDT | Special Weather Statement | UNR | 40 min |
| Jun 7, 12:38 PM MDT | Special Weather Statement | UNR | 37 min |
| Jun 7, 1:07 PM MDT | Severe Thunderstorm Warning | UNR | 53 min |
| Jun 7, 1:58 PM MDT | Severe Thunderstorm Warning | UNR | 62 min |
| Jun 7, 2:34 PM MDT | Special Weather Statement | UNR | 26 min |
| Jun 7, 3:23 PM MDT | Special Weather Statement | UNR | 37 min |
| Jun 7, 4:01 PM MDT | Severe Thunderstorm Warning | UNR | 44 min |
| Jun 10, 8:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 9:01 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 9:24 PM MDT | Severe Thunderstorm Warning | UNR | 66 min |
| Jun 10, 10:51 PM MDT | Severe Thunderstorm Warning | UNR | 54 min |
| Jun 10, 10:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 11:19 PM MDT | Special Weather Statement | UNR | 41 min |
| Jun 10, 11:48 PM MDT | Special Weather Statement | UNR | 42 min |
| Jun 11, 12:43 AM MDT | Special Weather Statement | UNR | 32 min |
| Jun 11, 1:05 AM MDT | Severe Thunderstorm Warning | UNR | 55 min |
| Jun 11, 11:43 PM MDT | Special Weather Statement | UNR | 62 min |
| Jun 12, 2:46 AM MDT | Special Weather Statement | UNR | 44 min |
| Jun 12, 5:35 PM MDT | Tornado Watch | SPC | 8 hr |
| Jun 12, 8:02 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jun 16, 1:55 PM MDT | Wind Advisory | UNR | 29 hr |
| Jun 21, 11:45 PM MDT | Special Weather Statement | UNR | 45 min |
| Jun 27, 2:04 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 2:28 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 4:51 PM MDT | Special Weather Statement | UNR | 24 min |
| Jun 29, 5:49 PM MDT | Special Weather Statement | UNR | 26 min |
| Jul 3, 1:04 PM MDT | Special Weather Statement | UNR | 41 min |
| Jul 3, 2:08 PM MDT | Special Weather Statement | UNR | 52 min |
| Jul 3, 3:00 PM MDT | Special Weather Statement | UNR | 30 min |
| Jul 4, 1:46 PM MDT | Special Weather Statement | UNR | 44 min |
| Jul 4, 2:42 PM MDT | Special Weather Statement | UNR | 48 min |
| Jul 5, 2:09 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 9:01 PM MDT | Special Weather Statement | UNR | 44 min |
| Jul 10, 4:08 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 11, 9:02 PM MDT | Severe Thunderstorm Warning | UNR | 43 min |
| Jul 11, 9:45 PM MDT | Severe Thunderstorm Warning | UNR | 60 min |
| Jul 14, 6:47 PM MDT | Special Weather Statement | UNR | 28 min |
| Jul 14, 7:31 PM MDT | Special Weather Statement | UNR | 44 min |
| Jul 15, 3:59 PM MDT | Special Weather Statement | UNR | 31 min |
| Jul 17, 2:51 PM MDT | Special Weather Statement | UNR | 24 min |
| Jul 17, 3:24 PM MDT | Special Weather Statement | UNR | 36 min |
| Jul 17, 5:35 PM MDT | Special Weather Statement | UNR | 25 min |
| Jul 18, 2:22 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 5:06 PM MDT | Special Weather Statement | UNR | 24 min |
| Jul 18, 5:17 PM MDT | Severe Thunderstorm Warning | UNR | 38 min |
| Jul 18, 6:58 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 11:02 PM MDT | Special Weather Statement | UNR | 28 min |
| Jul 27, 3:48 PM MDT | Special Weather Statement | UNR | 27 min |
| Jul 27, 4:27 PM MDT | Special Weather Statement | UNR | 33 min |
| Jul 27, 4:50 PM MDT | Severe Thunderstorm Warning | UNR | 34 min |
| Jul 27, 5:15 PM MDT | Special Weather Statement | UNR | 30 min |
| Jul 27, 5:28 PM MDT | Special Weather Statement | UNR | 32 min |
| Aug 1, 6:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Aug 1, 8:42 PM MDT | Special Weather Statement | UNR | 33 min |
| Aug 8, 2:07 PM MDT | Special Weather Statement | UNR | 38 min |
| Aug 11, 1:52 PM MDT | Special Weather Statement | UNR | 38 min |
| Aug 11, 2:33 PM MDT | Special Weather Statement | UNR | 42 min |
| Aug 14, 3:41 PM MDT | Special Weather Statement | UNR | 34 min |
| Aug 14, 3:44 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Aug 14, 4:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Aug 14, 5:01 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Aug 14, 5:29 PM MDT | Areal Flood Advisory | UNR | 4 hr |
| Aug 14, 7:26 PM MDT | Severe Thunderstorm Warning | UNR | 49 min |
| Aug 24, 1:22 PM MDT | Special Weather Statement | UNR | 53 min |
| Aug 24, 2:48 PM MDT | Areal Flood Advisory | UNR | 6 hr |
| Aug 25, 2:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 26, 12:23 PM MDT | Special Weather Statement | UNR | 52 min |
| Aug 26, 2:04 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 26, 3:14 PM MDT | Severe Thunderstorm Warning | UNR | 46 min |
| Aug 26, 3:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 26, 4:05 PM MDT | Severe Thunderstorm Warning | UNR | 25 min |
| Aug 26, 4:32 PM MDT | Special Weather Statement | UNR | 28 min |
| Aug 26, 5:05 PM MDT | Special Weather Statement | UNR | 40 min |
| Sep 8, 4:17 PM MDT | Special Weather Statement | UNR | 28 min |
| Sep 8, 4:45 PM MDT | Special Weather Statement | UNR | 45 min |
| Sep 8, 5:41 PM MDT | Special Weather Statement | UNR | 34 min |
| Sep 16, 1:36 PM MDT | Frost Advisory | UNR | 15 hr |
| Oct 3, 3:08 AM MDT | Freeze Watch | UNR | 11 hr |
| Oct 3, 3:08 AM MDT | Freeze Warning | UNR | 29 hr |
| Oct 22, 2:46 PM MDT | Wind Advisory | UNR | 27 hr |
| Oct 25, 2:10 PM MDT | Wind Advisory | UNR | 29 hr |
| Nov 26, 7:10 PM MST | Wind Advisory | UNR | 8 hr |
| Nov 28, 12:24 PM MST | High Wind Warning | UNR | 14 hr |
| Nov 28, 12:24 PM MST | Wind Advisory | UNR | 30 hr |
| Dec 3, 3:10 AM MST | Winter Storm Warning | UNR | 31 hr |
| Dec 3, 3:10 AM MST | Winter Weather Advisory | UNR | 38 hr |
| Dec 5, 3:34 AM MST | High Wind Warning | UNR | 14 hr |
| Dec 5, 1:05 PM MST | Winter Weather Advisory | UNR | 30 hr |
| Dec 6, 3:15 AM MST | Wind Advisory | UNR | 11 hr |
| Dec 7, 6:00 PM MST | Wind Advisory | UNR | 18 hr |
| Dec 10, 2:54 PM MST | Wind Advisory | UNR | 25 hr |
| Dec 12, 1:44 PM MST | Wind Advisory | UNR | 23 hr |
| Dec 13, 2:08 PM MST | Winter Weather Advisory | UNR | 22 hr |
| Dec 28, 2:37 PM MST | Winter Weather Advisory | UNR | 50 hr |
| Dec 30, 2:58 AM MST | Wind Chill Advisory | UNR | 56 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 | 19 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 20 |
| Special Weather Statement | 51 |
| Flooding | |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 17 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 2 |
| Wind Advisory | 16 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
| Freezing Fog Advisory | 1 |
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.