Alert archive / South Dakota / Fall River County
Weather alerts in Fall River County, South Dakota, 2018
134 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Fall River County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 134
- Warnings
- 40
- Watches
- 24
- Advisories
- 15
- Busiest month
- May39 alerts
- Busiest day
- May 23, 20187 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Fall River County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 24 | 18 | 25% | 21 | 81% | 17 min |
| Flash flood warnings | 2 | 0 | 100% | 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 10, 3:31 PM MST | Special Weather Statement | UNR | 119 min |
| Jan 19, 2:57 AM MST | Winter Storm Watch | UNR | 24 hr |
| Jan 20, 2:53 AM MST | Winter Storm Warning | UNR | 48 hr |
| Feb 3, 3:52 AM MST | Winter Storm Warning | UNR | 27 hr |
| Feb 3, 3:52 AM MST | Winter Weather Advisory | UNR | 25 hr |
| Feb 7, 2:42 PM MST | Winter Weather Advisory | UNR | 49 hr |
| Feb 9, 3:04 PM MST | Wind Chill Advisory | UNR | 18 hr |
| Feb 16, 2:11 PM MST | Winter Storm Watch | UNR | 48 hr |
| Feb 17, 1:55 PM MST | Winter Storm Warning | UNR | 64 hr |
| Feb 20, 1:45 PM MST | Wind Chill Advisory | UNR | 19 hr |
| Mar 3, 1:18 PM MST | Dense Fog Advisory | UNR | 22 hr |
| Mar 4, 3:22 AM MST | High Wind Warning | UNR | 41 hr |
| Mar 14, 1:52 AM MDT | Winter Storm Watch | UNR | 37 hr |
| Mar 15, 3:21 AM MDT | Winter Storm Warning | UNR | 39 hr |
| Mar 16, 3:04 AM MDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 5, 2:49 AM MDT | Winter Storm Warning | UNR | 33 hr |
| Apr 5, 2:49 AM MDT | Winter Weather Advisory | UNR | 33 hr |
| Apr 10, 2:45 PM MDT | Winter Storm Watch | UNR | 44 hr |
| Apr 12, 3:16 AM MDT | Winter Storm Warning | UNR | 35 hr |
| Apr 13, 2:27 PM MDT | Winter Weather Advisory | UNR | 4 hr |
| May 14, 3:54 PM MDT | Severe Thunderstorm Warning | UNR | 66 min |
| May 14, 5:24 PM MDT | Severe Thunderstorm Warning | UNR | 81 min |
| May 17, 12:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| May 17, 1:23 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| May 17, 2:40 PM MDT | Severe Thunderstorm Warning | UNR | 65 min |
| May 17, 3:06 PM MDT | Flash Flood Warning | UNR | 5 hr |
| May 17, 3:38 PM MDT | Severe Thunderstorm Warning | UNR | 67 min |
| May 17, 4:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| May 17, 6:03 PM MDT | Special Weather Statement | CYS | 42 min |
| May 17, 6:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| May 17, 7:11 PM MDT | Mesoscale Discussion | SPC | 64 min |
| May 17, 7:56 PM MDT | Flash Flood Warning | UNR | 102 min |
| May 18, 1:50 PM MDT | Mesoscale Discussion | SPC | 115 min |
| May 18, 5:04 PM MDT | Mesoscale Discussion | SPC | 86 min |
| May 22, 4:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 5:52 PM MDT | Severe Thunderstorm Warning | UNR | 53 min |
| May 22, 10:09 PM MDT | Special Weather Statement | UNR | 51 min |
| May 22, 10:22 PM MDT | Severe Thunderstorm Warning | UNR | 21 min |
| May 23, 1:00 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 23, 1:31 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 23, 4:06 PM MDT | Severe Thunderstorm Warning | UNR | 42 min |
| May 23, 5:07 PM MDT | Mesoscale Discussion | SPC | 83 min |
| May 23, 5:14 PM MDT | Special Weather Statement | UNR | 31 min |
| May 23, 7:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| May 27, 3:44 AM MDT | Flash Flood Watch | UNR | 23 hr |
| May 27, 4:42 PM MDT | Mesoscale Discussion | SPC | 93 min |
| May 27, 5:06 PM MDT | Mesoscale Discussion | SPC | 84 min |
| May 27, 5:27 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 27, 7:31 PM MDT | Mesoscale Discussion | SPC | 119 min |
| May 27, 7:56 PM MDT | Special Weather Statement | UNR | 49 min |
| May 27, 8:19 PM MDT | Severe Thunderstorm Warning | UNR | 56 min |
| May 27, 9:11 PM MDT | Severe Thunderstorm Warning | UNR | 64 min |
| May 28, 3:34 AM MDT | Flash Flood Watch | UNR | 24 hr |
| May 28, 7:58 PM MDT | Special Weather Statement | UNR | 47 min |
| May 28, 8:52 PM MDT | Special Weather Statement | UNR | 23 min |
| May 28, 9:55 PM MDT | Areal Flood Warning | UNR | 7 hr |
| May 29, 3:04 AM MDT | Flash Flood Watch | UNR | 21 hr |
| May 29, 9:48 AM MDT | Areal Flood Warning | UNR | 3 hr |
| May 29, 12:01 PM MDT | Areal Flood Warning | UNR | 48 hr |
| Jun 5, 4:32 PM MDT | Special Weather Statement | UNR | 28 min |
| Jun 5, 4:48 PM MDT | Special Weather Statement | UNR | 27 min |
| Jun 5, 4:54 PM MDT | Severe Thunderstorm Warning | UNR | 51 min |
| Jun 5, 5:43 PM MDT | Severe Thunderstorm Warning | UNR | 47 min |
| Jun 5, 5:54 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 1:51 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Jun 7, 3:49 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 7, 8:06 PM MDT | Severe Thunderstorm Warning | UNR | 24 min |
| Jun 8, 1:01 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 8, 1:39 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 9, 2:50 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 2:37 PM MDT | Flash Flood Watch | UNR | 15 hr |
| Jun 18, 1:46 PM MDT | Flash Flood Watch | UNR | 51 hr |
| Jun 22, 12:56 PM MDT | Mesoscale Discussion | SPC | 94 min |
| Jun 22, 2:12 PM MDT | Flood Watch | UNR | 54 hr |
| Jun 23, 4:14 PM MDT | Mesoscale Discussion | SPC | 61 min |
| Jun 29, 1:06 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 29, 2:29 PM MDT | Mesoscale Discussion | SPC | 91 min |
| Jun 29, 6:14 PM MDT | Severe Thunderstorm Warning | UNR | 61 min |
| Jun 29, 6:25 PM MDT | Severe Thunderstorm Warning | UNR | 50 min |
| Jun 29, 6:45 PM MDT | Special Weather Statement | CYS | 45 min |
| Jun 29, 7:13 PM MDT | Severe Thunderstorm Warning | UNR | 62 min |
| Jun 29, 8:02 PM MDT | Special Weather Statement | UNR | 28 min |
| Jul 3, 4:42 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 3, 6:01 PM MDT | Severe Thunderstorm Warning | UNR | 59 min |
| Jul 3, 8:38 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 2:00 PM MDT | Heat Advisory | UNR | 53 hr |
| Jul 9, 6:22 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 16, 2:52 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 17, 3:02 AM MDT | Flash Flood Watch | UNR | 20 hr |
| Jul 17, 2:47 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 3:09 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 17, 5:49 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Jul 17, 8:59 PM MDT | Special Weather Statement | UNR | 46 min |
| Jul 17, 9:13 PM MDT | Severe Thunderstorm Warning | UNR | 44 min |
| Jul 17, 9:56 PM MDT | Special Weather Statement | UNR | 49 min |
| Jul 20, 1:31 PM MDT | Flash Flood Watch | UNR | 35 hr |
| Jul 21, 12:50 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 4:11 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 21, 8:40 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 24, 3:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 2:57 AM MDT | Special Weather Statement | UNR | 48 min |
| Jul 27, 4:55 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 6:27 PM MDT | Severe Thunderstorm Warning | UNR | 48 min |
| Jul 27, 6:48 PM MDT | Severe Thunderstorm Warning | UNR | 57 min |
| Jul 28, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 28, 2:34 PM MDT | Tornado Watch | SPC | 7 hr |
| Jul 28, 6:38 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 29, 12:46 PM MDT | Mesoscale Discussion | SPC | 59 min |
| Jul 29, 1:24 PM MDT | Severe Thunderstorm Warning | UNR | 27 min |
| Jul 29, 1:34 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 29, 2:30 PM MDT | Severe Thunderstorm Warning | UNR | 32 min |
| Jul 29, 4:07 PM MDT | Mesoscale Discussion | SPC | 53 min |
| Jul 29, 6:02 PM MDT | Severe Thunderstorm Warning | UNR | 28 min |
| Aug 6, 5:51 PM MDT | Special Weather Statement | UNR | 39 min |
| Aug 15, 6:16 AM MDT | Special Weather Statement | UNR | 29 min |
| Aug 15, 6:54 AM MDT | Severe Thunderstorm Warning | UNR | 66 min |
| Aug 15, 8:03 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 3:20 PM MDT | Special Weather Statement | UNR | 25 min |
| Aug 15, 3:27 PM MDT | Severe Thunderstorm Warning | UNR | 28 min |
| Aug 15, 4:24 PM MDT | Special Weather Statement | UNR | 36 min |
| Aug 23, 2:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Sep 8, 4:07 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 25, 1:32 PM MDT | Frost Advisory | UNR | 18 hr |
| Sep 25, 1:32 PM MDT | Freeze Warning | UNR | 18 hr |
| Oct 13, 8:16 AM MDT | Winter Weather Advisory | UNR | 18 hr |
| Oct 13, 7:53 PM MDT | Winter Storm Warning | UNR | 6 hr |
| Nov 2, 2:39 PM MDT | Wind Advisory | UNR | 23 hr |
| Nov 16, 8:40 PM MST | Winter Weather Advisory | UNR | 8 hr |
| Nov 23, 2:25 PM MST | Winter Weather Advisory | UNR | 36 hr |
| Nov 28, 1:36 PM MST | Winter Storm Watch | UNR | 38 hr |
| Nov 29, 2:01 PM MST | Winter Storm Warning | UNR | 66 hr |
| Nov 30, 3:24 AM MST | Winter Weather Advisory | UNR | 48 hr |
| Dec 29, 2:19 PM MST | Winter Weather Advisory | UNR | 51 hr |
| Dec 30, 3:10 AM MST | Winter Storm Warning | UNR | 35 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 | 24 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 37 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 9 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
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.