Alert archive / Iowa / Buena Vista County
Weather alerts in Buena Vista County, Iowa, 2021
94 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Buena Vista County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 94
- Warnings
- 21
- Watches
- 12
- Advisories
- 37
- Busiest month
- December17 alerts
- Busiest day
- December 15, 202110 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 5 tornado warnings covering Buena Vista County in 2021 had a tornado report inside them.
Buena Vista County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 7 | 5 | 29% | 5 | 100% | 13 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 24 | 3 | 88% | 8 | 50% | 10 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 176 | 117 | 34% | 292 | 85% | 20 min |
| NWS Sioux Falls, SD: flash flood warnings | 7 | 3 | 57% | 9 | 89% | 51 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, 5:56 PM CST | Dense Fog Advisory | FSD | 21 hr |
| Jan 2, 2:53 PM CST | Dense Fog Advisory | FSD | 39 hr |
| Jan 7, 2:42 PM CST | Dense Fog Advisory | FSD | 20 hr |
| Jan 13, 3:35 AM CST | Winter Storm Watch | FSD | 24 hr |
| Jan 13, 3:32 PM CST | High Wind Warning | FSD | 44 hr |
| Jan 14, 3:30 AM CST | Blizzard Warning | FSD | 39 hr |
| Jan 15, 2:19 PM CST | Winter Weather Advisory | FSD | 8 hr |
| Jan 22, 4:05 AM CST | Winter Weather Advisory | FSD | 44 hr |
| Jan 25, 4:05 AM CST | Winter Weather Advisory | FSD | 29 hr |
| Jan 29, 2:05 PM CST | Winter Weather Advisory | FSD | 34 hr |
| Feb 1, 11:39 PM CST | Dense Fog Advisory | FSD | 11 hr |
| Feb 3, 3:15 AM CST | Winter Weather Advisory | FSD | 33 hr |
| Feb 6, 3:03 AM CST | Wind Chill Advisory | FSD | 33 hr |
| Feb 8, 2:31 PM CST | Wind Chill Advisory | FSD | 18 hr |
| Feb 11, 2:45 PM CST | Wind Chill Advisory | FSD | 21 hr |
| Feb 12, 2:09 PM CST | Wind Chill Watch | FSD | 61 hr |
| Feb 12, 2:09 PM CST | Wind Chill Advisory | FSD | 22 hr |
| Feb 13, 3:35 AM CST | Wind Chill Warning | FSD | 3 days |
| Feb 20, 3:29 AM CST | Winter Weather Advisory | FSD | 36 hr |
| Feb 21, 8:24 PM CST | Dense Fog Advisory | FSD | 7 hr |
| Mar 10, 1:32 PM CST | Mesoscale Discussion | SPC | 118 min |
| Mar 10, 1:47 PM CST | Wind Advisory | FSD | 10 hr |
| Mar 13, 3:24 AM CST | Winter Storm Watch | FSD | 24 hr |
| Mar 13, 3:18 PM CST | Wind Advisory | FSD | 26 hr |
| Mar 14, 4:03 AM CDT | Winter Storm Warning | FSD | 32 hr |
| Mar 14, 6:20 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 15, 1:50 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 21, 3:04 AM CDT | Wind Advisory | FSD | 12 hr |
| Mar 27, 3:31 PM CDT | Fire Weather Watch | FSD | 23 hr |
| Mar 28, 2:40 PM CDT | Wind Advisory | FSD | 30 hr |
| Mar 28, 2:47 PM CDT | Red Flag Warning | FSD | 30 hr |
| Apr 2, 10:49 AM CDT | Red Flag Warning | FSD | 9 hr |
| May 1, 3:09 AM CDT | Red Flag Warning | FSD | 16 hr |
| May 10, 3:12 PM CDT | Frost Advisory | FSD | 17 hr |
| May 15, 1:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 19, 1:59 AM CDT | Dense Fog Advisory | FSD | 7 hr |
| May 31, 2:46 AM CDT | Dense Fog Advisory | FSD | 6 hr |
| Jun 10, 3:31 AM CDT | Heat Advisory | FSD | 16 hr |
| Jun 16, 6:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 8:38 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Jun 16, 9:00 PM CDT | Severe Thunderstorm Warning | FSD | 45 min |
| Jun 16, 9:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 17, 3:00 AM CDT | Heat Advisory | FSD | 16 hr |
| Jun 22, 3:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 1:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 3:24 AM CDT | Heat Advisory | FSD | 17 hr |
| Jul 5, 5:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 8, 9:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 2:41 AM CDT | Mesoscale Discussion | SPC | 34 min |
| Jul 14, 7:02 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 1:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 2:35 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 26, 3:11 AM CDT | Excessive Heat Watch | FSD | 35 hr |
| Jul 26, 3:11 AM CDT | Heat Advisory | FSD | 42 hr |
| Jul 27, 2:22 PM CDT | Heat Advisory | FSD | 31 hr |
| Aug 5, 9:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 5:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 6:31 PM CDT | Tornado Warning | FSD | 44 min |
| Aug 8, 7:15 PM CDT | Tornado Warning | FSD | 45 min |
| Aug 20, 1:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 20, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 26, 7:37 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 26, 5:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 26, 10:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 1:52 AM CDT | Severe Thunderstorm Warning | FSD | 68 min |
| Aug 27, 2:00 AM CDT | Severe Thunderstorm Warning | FSD | 60 min |
| Aug 28, 9:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 13, 9:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Sep 17, 1:11 AM CDT | Severe Thunderstorm Warning | FSD | 49 min |
| Oct 13, 2:53 AM CDT | Wind Advisory | FSD | 20 hr |
| Oct 15, 3:30 AM CDT | Frost Advisory | FSD | 30 hr |
| Oct 20, 7:39 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Nov 4, 4:23 AM CDT | Dense Fog Advisory | FSD | 10 hr |
| Nov 10, 2:54 PM CST | Wind Advisory | FSD | 51 hr |
| Nov 13, 5:00 PM CST | Wind Advisory | FSD | 10 hr |
| Dec 4, 3:11 PM CST | Wind Advisory | FSD | 35 hr |
| Dec 8, 3:31 AM CST | Winter Storm Watch | FSD | 32 hr |
| Dec 9, 11:23 AM CST | Winter Storm Warning | FSD | 40 hr |
| Dec 14, 4:04 AM CST | High Wind Warning | FSD | 47 hr |
| Dec 15, 2:56 AM CST | Dense Fog Advisory | FSD | 6 hr |
| Dec 15, 12:28 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 15, 1:23 PM CST | Tornado Watch | SPC | 7 hr |
| Dec 15, 3:55 PM CST | Mesoscale Discussion | SPC | 95 min |
| Dec 15, 4:05 PM CST | Severe Thunderstorm Warning | FSD | 55 min |
| Dec 15, 4:42 PM CST | Tornado Warning | FSD | 33 min |
| Dec 15, 4:56 PM CST | Severe Thunderstorm Warning | FSD | 46 min |
| Dec 15, 5:08 PM CST | Tornado Warning | FSD | 37 min |
| Dec 15, 5:15 PM CST | Tornado Warning | FSD | 30 min |
| Dec 15, 5:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Dec 15, 9:07 PM CST | Wind Advisory | FSD | 9 hr |
| Dec 26, 1:52 PM CST | Wind Advisory | FSD | 22 hr |
| Dec 31, 7:41 AM CST | Dense Fog Advisory | FSD | 4 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 | 7 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 24 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 6 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 5 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 2 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.