Alert archive / South Dakota / Harding County
Weather alerts in Harding County, South Dakota, 2009
127 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Harding County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 127
- Warnings
- 32
- Watches
- 24
- Advisories
- 39
- Busiest month
- July25 alerts
- Busiest day
- May 12, 20095 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Harding County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 6 | 40% | 8 | 88% | 29 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 50% | 79 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Rapid City, SD: tornado warnings | 27 | 6 | 78% | 10 | 90% | 19 min |
| NWS Rapid City, SD: severe thunderstorm warnings | 262 | 172 | 34% | 345 | 79% | 27 min |
| NWS Rapid City, SD: flash flood warnings | 10 | 4 | 60% | 4 | 75% | 59 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 3, 3:20 AM MST | Wind Chill Advisory | UNR | 19 hr |
| Jan 8, 3:20 AM MST | High Wind Watch | UNR | 11 hr |
| Jan 8, 9:31 AM MST | Freezing Rain Advisory | UNR | 10 hr |
| Jan 8, 2:25 PM MST | High Wind Warning | UNR | 26 hr |
| Jan 10, 2:51 PM MST | High Wind Watch | UNR | 14 hr |
| Jan 11, 4:23 AM MST | High Wind Warning | UNR | 32 hr |
| Jan 12, 4:34 AM MST | Mesoscale Discussion | SPC | 4 hr |
| Jan 13, 1:10 PM MST | Wind Advisory | UNR | 14 hr |
| Jan 13, 8:08 PM MST | Wind Chill Advisory | UNR | 16 hr |
| Jan 16, 3:14 AM MST | Wind Advisory | UNR | 35 hr |
| Jan 18, 3:34 AM MST | Wind Advisory | UNR | 13 hr |
| Jan 19, 3:35 AM MST | Wind Advisory | UNR | 11 hr |
| Jan 22, 6:27 PM MST | Wind Advisory | UNR | 8 hr |
| Jan 27, 1:39 PM MST | Wind Advisory | UNR | 28 hr |
| Jan 30, 2:38 PM MST | Wind Advisory | UNR | 24 hr |
| Jan 31, 3:49 AM MST | High Wind Warning | UNR | 11 hr |
| Feb 1, 3:36 AM MST | Wind Advisory | UNR | 12 hr |
| Feb 9, 4:13 AM MST | Winter Weather Advisory | UNR | 24 hr |
| Feb 20, 2:23 AM MST | Wind Advisory | UNR | 18 hr |
| Feb 25, 11:43 AM MST | Winter Storm Warning | UNR | 22 hr |
| Feb 25, 9:20 PM MST | Mesoscale Discussion | SPC | 6 hr |
| Feb 26, 1:07 PM MST | Winter Weather Advisory | UNR | 26 hr |
| Mar 8, 3:21 AM MDT | Winter Storm Watch | UNR | 24 hr |
| Mar 9, 3:23 AM MDT | Winter Storm Warning | UNR | 33 hr |
| Mar 9, 8:49 PM MDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 10, 10:03 AM MDT | River Flood Warning | UNR | 5 days |
| Mar 10, 2:07 PM MDT | Wind Chill Advisory | UNR | 20 hr |
| Mar 14, 1:56 PM MDT | Areal Flood Advisory | UNR | 7 days |
| Mar 17, 9:19 PM MDT | River Flood Warning | UNR | 71 hr |
| Mar 21, 3:03 AM MDT | Blizzard Watch | UNR | 24 hr |
| Mar 22, 3:30 AM MDT | Blizzard Warning | UNR | 65 hr |
| Mar 22, 4:10 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Mar 23, 3:59 AM MDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 23, 11:06 AM MDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 23, 5:56 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 28, 2:44 AM MDT | Blizzard Watch | UNR | 37 hr |
| Mar 29, 3:04 AM MDT | Blizzard Warning | UNR | 57 hr |
| Mar 29, 9:05 PM MDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 2, 4:06 AM MDT | Winter Storm Watch | UNR | 25 hr |
| Apr 3, 4:55 AM MDT | Winter Storm Warning | UNR | 41 hr |
| Apr 3, 4:55 AM MDT | Winter Weather Advisory | UNR | 27 hr |
| Apr 9, 3:07 PM MDT | Flood Watch | UNR | 72 hr |
| Apr 12, 7:09 AM MDT | Areal Flood Warning | UNR | 24 hr |
| Apr 12, 10:15 AM MDT | River Flood Warning | UNR | 10 days |
| Apr 13, 6:15 AM MDT | Areal Flood Warning | UNR | 5 days |
| Apr 14, 9:11 AM MDT | Flash Flood Warning | UNR | 5 hr |
| Apr 18, 2:17 PM MDT | Areal Flood Advisory | UNR | 48 hr |
| Apr 24, 8:40 AM MDT | Winter Weather Advisory | UNR | 3 hr |
| Apr 25, 1:46 PM MDT | Winter Storm Warning | UNR | 25 hr |
| Apr 28, 3:41 AM MDT | Wind Advisory | UNR | 11 hr |
| Apr 29, 2:32 PM MDT | Wind Advisory | UNR | 9 hr |
| May 12, 3:27 AM MDT | High Wind Watch | UNR | 11 hr |
| May 12, 2:19 PM MDT | Mesoscale Discussion | SPC | 56 min |
| May 12, 2:22 PM MDT | High Wind Warning | UNR | 29 hr |
| May 12, 2:36 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 12, 4:14 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 14, 2:22 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 14, 4:09 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 14, 6:17 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jun 14, 10:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 3:48 AM MDT | Flood Watch | UNR | 24 hr |
| Jun 17, 5:35 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 12:57 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jun 24, 12:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 25, 3:49 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Jun 26, 3:04 AM MDT | Flash Flood Watch | UNR | 18 hr |
| Jun 27, 11:37 AM MDT | Mesoscale Discussion | SPC | 53 min |
| Jun 30, 2:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Jun 30, 3:19 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 6:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jun 30, 8:21 PM MDT | Severe Thunderstorm Warning | UNR | 54 min |
| Jun 30, 9:03 PM MDT | Severe Thunderstorm Warning | UNR | 57 min |
| Jun 30, 9:18 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Jun 30, 9:42 PM MDT | Severe Thunderstorm Warning | UNR | 63 min |
| Jul 2, 11:25 AM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 2, 11:41 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 2, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 2, 6:29 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jul 8, 1:02 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 8, 2:20 PM MDT | Tornado Watch | SPC | 8 hr |
| Jul 8, 4:30 PM MDT | Severe Thunderstorm Warning | UNR | 45 min |
| Jul 8, 5:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 8, 5:57 PM MDT | Severe Thunderstorm Warning | UNR | 46 min |
| Jul 8, 8:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Jul 13, 9:57 AM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 12:34 PM MDT | Tornado Watch | SPC | 8 hr |
| Jul 13, 5:05 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 13, 7:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Jul 14, 3:17 AM MDT | Wind Advisory | UNR | 17 hr |
| Jul 19, 2:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 19, 6:01 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Jul 19, 6:17 PM MDT | Severe Thunderstorm Warning | UNR | 58 min |
| Jul 19, 6:28 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 7:05 PM MDT | Severe Thunderstorm Warning | UNR | 55 min |
| Aug 7, 11:50 AM MDT | Mesoscale Discussion | SPC | 115 min |
| Aug 7, 4:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Aug 7, 4:56 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 7, 8:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Aug 7, 9:25 PM MDT | Severe Thunderstorm Warning | UNR | 95 min |
| Aug 19, 11:16 AM MDT | Mesoscale Discussion | SPC | 119 min |
| Aug 23, 7:55 PM MDT | Tornado Watch | SPC | 5 hr |
| Sep 10, 2:36 PM MDT | Wind Advisory | UNR | 17 min |
| Sep 10, 2:53 PM MDT | Wind Advisory | UNR | 13 hr |
| Sep 13, 3:26 AM MDT | Wind Advisory | UNR | 17 hr |
| Sep 21, 2:50 AM MDT | Wind Advisory | UNR | 15 hr |
| Sep 26, 2:39 AM MDT | Wind Advisory | UNR | 39 hr |
| Sep 27, 2:36 AM MDT | High Wind Warning | UNR | 15 hr |
| Sep 27, 2:34 PM MDT | Frost Advisory | UNR | 17 hr |
| Sep 28, 2:45 PM MDT | Wind Advisory | UNR | 29 hr |
| Sep 29, 3:29 AM MDT | High Wind Watch | UNR | 36 hr |
| Sep 30, 3:26 AM MDT | High Wind Warning | UNR | 42 hr |
| Sep 30, 3:00 PM MDT | Wind Advisory | UNR | 48 hr |
| Oct 2, 3:46 AM MDT | Freeze Warning | UNR | 29 hr |
| Oct 3, 3:18 PM MDT | Winter Storm Watch | UNR | 24 hr |
| Oct 4, 3:17 PM MDT | Winter Weather Advisory | UNR | 36 hr |
| Oct 9, 3:33 AM MDT | Wind Advisory | UNR | 9 hr |
| Oct 28, 4:32 AM MDT | Winter Storm Warning | UNR | 46 hr |
| Oct 28, 4:32 AM MDT | Winter Weather Advisory | UNR | 46 hr |
| Nov 30, 1:08 PM MST | Wind Advisory | UNR | 28 hr |
| Dec 8, 2:33 PM MST | Wind Chill Advisory | UNR | 21 hr |
| Dec 9, 2:55 PM MST | Wind Chill Advisory | UNR | 13 hr |
| Dec 14, 3:40 PM MST | Wind Chill Advisory | UNR | 17 hr |
| Dec 21, 1:28 PM MST | Winter Storm Watch | UNR | 39 hr |
| Dec 22, 4:23 AM MST | Winter Storm Warning | UNR | 5 days |
| Dec 22, 12:36 PM MST | Winter Weather Advisory | UNR | 4 days |
| Dec 24, 2:33 PM MST | Blizzard Warning | UNR | 56 hr |
| Dec 26, 10:25 PM MST | Winter Weather Advisory | UNR | 4 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.