Alert archive / South Dakota / Lawrence County
Weather alerts in Lawrence County, South Dakota, 2011
161 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 161
- Warnings
- 47
- Watches
- 35
- Advisories
- 45
- Busiest month
- July38 alerts
- Busiest day
- June 12, 20116 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, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 25 | 18 | 28% | 20 | 85% | 13 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Rapid City, SD: tornado warnings | 23 | 2 | 91% | 5 | 40% | 55 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 426 | 315 | 26% | 626 | 88% | 25 min |
| NWS Rapid City, SD: flash flood warnings | 30 | 10 | 67% | 16 | 94% | 70 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 |
|---|---|---|---|
| Dec 31, 10:00 PM MST | Wind Chill Advisory | UNR | 12 hr |
| Jan 7, 2:38 AM MST | Winter Storm Watch | UNR | 11 hr |
| Jan 7, 1:26 PM MST | Winter Storm Warning | UNR | 47 hr |
| Jan 7, 1:26 PM MST | Winter Weather Advisory | UNR | 58 hr |
| Jan 16, 2:44 PM MST | Winter Weather Advisory | UNR | 20 hr |
| Jan 20, 2:44 PM MST | Winter Storm Watch | UNR | 24 hr |
| Jan 21, 2:23 PM MST | Winter Storm Warning | UNR | 28 hr |
| Jan 21, 2:23 PM MST | Winter Weather Advisory | UNR | 28 hr |
| Jan 29, 2:03 PM MST | Winter Weather Advisory | UNR | 48 hr |
| Jan 29, 5:06 PM MST | Freezing Fog Advisory | UNR | 16 hr |
| Jan 31, 2:44 AM MST | Wind Chill Warning | UNR | 33 hr |
| Feb 1, 4:09 AM MST | Wind Chill Advisory | UNR | 16 hr |
| Feb 1, 2:54 PM MST | Wind Chill Warning | UNR | 19 hr |
| Feb 2, 3:10 AM MST | Wind Chill Advisory | UNR | 7 hr |
| Feb 4, 2:12 PM MST | Winter Storm Warning | UNR | 48 hr |
| Feb 4, 2:12 PM MST | Winter Weather Advisory | UNR | 48 hr |
| Feb 6, 2:39 PM MST | Winter Weather Advisory | UNR | 30 hr |
| Feb 8, 2:41 PM MST | Wind Chill Advisory | UNR | 19 hr |
| Feb 12, 3:05 PM MST | Wind Advisory | UNR | 28 hr |
| Feb 16, 3:39 AM MST | Wind Advisory | UNR | 24 hr |
| Feb 16, 2:39 PM MST | Wind Advisory | UNR | 26 hr |
| Feb 16, 9:12 PM MST | High Wind Warning | UNR | 7 hr |
| Feb 18, 1:56 PM MST | Winter Storm Watch | UNR | 13 hr |
| Feb 19, 2:35 AM MST | Winter Storm Warning | UNR | 44 hr |
| Feb 20, 2:19 PM MST | Winter Weather Advisory | UNR | 9 hr |
| Feb 23, 2:26 PM MST | Winter Weather Advisory | UNR | 38 hr |
| Feb 24, 2:48 PM MST | Wind Chill Advisory | UNR | 13 hr |
| Mar 3, 10:24 PM MST | Severe Thunderstorm Watch | SPC | 157 days |
| Mar 10, 2:57 PM MST | Wind Advisory | UNR | 27 hr |
| Mar 10, 9:07 PM MST | High Wind Warning | UNR | 7 hr |
| Mar 25, 3:18 AM MDT | Winter Weather Advisory | UNR | 39 hr |
| Mar 26, 11:03 PM MDT | Winter Weather Advisory | UNR | 13 hr |
| Apr 2, 2:52 PM MDT | Wind Advisory | UNR | 33 hr |
| Apr 13, 4:32 AM MDT | Winter Storm Watch | UNR | 24 hr |
| Apr 14, 4:07 AM MDT | Winter Weather Advisory | UNR | 24 hr |
| Apr 18, 2:42 PM MDT | Winter Weather Advisory | UNR | 24 hr |
| Apr 21, 2:48 PM MDT | High Wind Watch | UNR | 13 hr |
| Apr 21, 2:53 PM MDT | Winter Storm Watch | UNR | 13 hr |
| Apr 22, 3:51 AM MDT | Winter Storm Warning | UNR | 24 hr |
| Apr 22, 3:51 AM MDT | Winter Weather Advisory | UNR | 24 hr |
| Apr 26, 1:52 PM MDT | Winter Storm Warning | UNR | 7 hr |
| Apr 26, 9:04 PM MDT | Winter Weather Advisory | UNR | 10 hr |
| Apr 29, 3:22 PM MDT | High Wind Watch | UNR | 11 hr |
| Apr 30, 2:44 AM MDT | High Wind Warning | UNR | 16 hr |
| Apr 30, 6:55 PM MDT | High Wind Warning | UNR | 2 hr |
| May 7, 9:13 PM MDT | Flood Watch | UNR | 63 hr |
| May 9, 2:26 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 9, 4:57 PM MDT | Mesoscale Discussion | SPC | 93 min |
| May 9, 8:16 PM MDT | Mesoscale Discussion | SPC | 29 min |
| May 16, 2:59 PM MDT | Flash Flood Watch | UNR | 4 days |
| May 19, 10:06 AM MDT | Winter Weather Advisory | UNR | 12 hr |
| May 21, 8:09 AM MDT | Areal Flood Warning | UNR | 4 days |
| May 22, 2:56 PM MDT | Flood Watch | UNR | 60 hr |
| May 27, 2:49 PM MDT | Flood Watch | UNR | 61 hr |
| May 30, 2:39 PM MDT | Wind Advisory | UNR | 27 hr |
| Jun 6, 3:04 PM MDT | High Wind Warning | UNR | 14 hr |
| Jun 6, 3:50 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 6, 7:10 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jun 11, 1:40 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 3:59 PM MDT | Tornado Watch | SPC | 7 hr |
| Jun 11, 7:11 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jun 12, 10:02 AM MDT | Flash Flood Watch | UNR | 10 hr |
| Jun 12, 12:52 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 12, 1:49 PM MDT | Tornado Watch | SPC | 6 hr |
| Jun 12, 4:47 PM MDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jun 12, 5:41 PM MDT | Severe Thunderstorm Warning | UNR | 64 min |
| Jun 13, 7:23 PM MDT | Severe Thunderstorm Warning | UNR | 36 min |
| Jun 24, 1:25 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jun 24, 1:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 3:26 PM MDT | Severe Thunderstorm Warning | UNR | 64 min |
| Jun 24, 5:37 PM MDT | Severe Thunderstorm Warning | UNR | 53 min |
| Jun 24, 6:19 PM MDT | Severe Thunderstorm Warning | UNR | 56 min |
| Jun 24, 6:30 PM MDT | Severe Thunderstorm Warning | UNR | 60 min |
| Jun 25, 1:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 25, 5:21 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 25, 7:14 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 25, 8:14 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 25, 10:23 PM MDT | Severe Thunderstorm Warning | UNR | 31 min |
| Jun 30, 2:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jul 2, 12:17 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 2, 2:13 PM MDT | Tornado Watch | SPC | 8 hr |
| Jul 2, 4:55 PM MDT | Flash Flood Warning | UNR | 3 hr |
| Jul 2, 4:59 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 5:59 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jul 2, 6:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Jul 5, 1:22 PM MDT | Areal Flood Advisory | UNR | 4 hr |
| Jul 5, 1:30 PM MDT | Severe Thunderstorm Warning | UNR | 60 min |
| Jul 5, 1:58 PM MDT | Flash Flood Warning | UNR | 4 hr |
| Jul 5, 3:19 PM MDT | Areal Flood Advisory | UNR | 5 hr |
| Jul 6, 12:25 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 3:29 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 3:48 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 11:31 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Jul 9, 12:12 AM MDT | Severe Thunderstorm Warning | UNR | 43 min |
| Jul 11, 1:50 PM MDT | Mesoscale Discussion | SPC | 85 min |
| Jul 11, 2:07 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 2:11 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jul 18, 2:28 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 2:36 PM MDT | Wind Advisory | UNR | 24 hr |
| Jul 24, 2:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jul 25, 11:23 AM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 25, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 25, 3:59 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jul 25, 4:37 PM MDT | Areal Flood Advisory | UNR | 50 min |
| Jul 25, 4:39 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 27, 2:49 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 27, 5:13 PM MDT | Severe Thunderstorm Warning | UNR | 62 min |
| Jul 28, 1:05 PM MDT | Mesoscale Discussion | SPC | 115 min |
| Jul 28, 2:13 PM MDT | Severe Thunderstorm Warning | UNR | 42 min |
| Jul 28, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 28, 3:49 PM MDT | Severe Thunderstorm Warning | UNR | 24 min |
| Jul 28, 5:19 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jul 29, 12:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jul 29, 1:54 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 29, 4:22 PM MDT | Severe Thunderstorm Warning | UNR | 53 min |
| Jul 29, 4:46 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jul 31, 4:21 PM MDT | Severe Thunderstorm Warning | UNR | 54 min |
| Aug 1, 1:19 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 3, 1:01 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 5, 12:05 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 12:48 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 5, 4:25 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 4:19 PM MDT | Severe Thunderstorm Warning | UNR | 43 min |
| Aug 7, 4:48 PM MDT | Severe Thunderstorm Warning | UNR | 31 min |
| Aug 11, 2:05 PM MDT | Tornado Watch | SPC | 5 hr |
| Aug 11, 3:14 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Aug 11, 3:55 PM MDT | Severe Thunderstorm Warning | UNR | 43 min |
| Aug 11, 6:16 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 11, 8:55 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Aug 14, 1:33 PM MDT | Severe Thunderstorm Warning | UNR | 26 min |
| Aug 14, 1:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Aug 15, 2:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Aug 25, 3:59 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Sep 2, 6:09 PM MDT | Wind Advisory | UNR | 11 hr |
| Sep 19, 2:15 PM MDT | High Wind Warning | UNR | 24 hr |
| Sep 29, 11:03 AM MDT | Frost Advisory | UNR | 21 hr |
| Oct 6, 2:18 PM MDT | Wind Advisory | UNR | 29 hr |
| Oct 6, 2:19 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Oct 6, 2:32 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Oct 6, 7:47 PM MDT | Severe Thunderstorm Warning | UNR | 58 min |
| Oct 7, 3:50 AM MDT | High Wind Warning | UNR | 15 hr |
| Oct 17, 2:52 PM MDT | Freeze Warning | UNR | 18 hr |
| Oct 23, 5:48 AM MDT | Wind Advisory | UNR | 9 hr |
| Oct 29, 3:36 AM MDT | Wind Advisory | UNR | 15 hr |
| Nov 4, 2:36 PM MDT | Winter Weather Advisory | UNR | 32 hr |
| Nov 15, 10:12 AM MST | Wind Advisory | UNR | 5 hr |
| Nov 17, 2:15 PM MST | Winter Storm Watch | UNR | 22 hr |
| Nov 18, 12:19 PM MST | Winter Storm Warning | UNR | 26 hr |
| Nov 18, 10:43 PM MST | Mesoscale Discussion | SPC | 5 hr |
| Nov 23, 2:48 PM MST | Wind Advisory | UNR | 13 hr |
| Nov 24, 2:18 PM MST | High Wind Watch | UNR | 25 hr |
| Nov 25, 2:28 AM MST | Wind Advisory | UNR | 37 hr |
| Nov 29, 3:43 AM MST | Winter Storm Watch | UNR | 11 hr |
| Nov 29, 3:04 PM MST | Winter Storm Warning | UNR | 39 hr |
| Nov 29, 3:04 PM MST | Winter Weather Advisory | UNR | 39 hr |
| Dec 3, 3:11 PM MST | Winter Weather Advisory | UNR | 32 hr |
| Dec 12, 2:18 PM MST | Dense Fog Advisory | UNR | 13 hr |
| Dec 20, 2:46 PM MST | Winter Weather Advisory | UNR | 32 hr |
| Dec 30, 3:39 AM MST | High Wind Watch | UNR | 11 hr |
| Dec 30, 2:36 PM MST | High Wind Warning | UNR | 26 hr |
| Dec 30, 2:36 PM MST | Wind Advisory | UNR | 45 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 | 25 |
| Severe Thunderstorm Watch | 15 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 34 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 8 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 19 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 8 |
| High Wind Watch | 4 |
| Wind Advisory | 15 |
| 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 archive20102012
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.