Alert archive / Iowa / Sioux County / 2026
Weather alerts in Sioux County, Iowa, May 2026
27 weather alerts in May 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 27
- Warnings
- 11
- Watches
- 3
- Advisories
- 3
- Busiest day
- May 17, 20265 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|
| May 1, 1:06 PM CDT | Freeze Warning | FSD | 19 hr |
| May 5, 1:19 PM CDT | Frost Advisory | FSD | 18 hr |
| May 10, 1:08 PM CDT | Frost Advisory | FSD | 19 hr |
| May 11, 3:07 PM CDT | Red Flag Warning | FSD | 30 hr |
| May 13, 1:54 PM CDT | Red Flag Warning | FSD | 30 hr |
| May 15, 3:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 15, 6:08 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| May 15, 7:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 1:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 1:42 PM CDT | Tornado Watch | SPC | 8 hr |
| May 17, 3:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 17, 5:56 PM CDT | Severe Thunderstorm Warning | FSD | 27 min |
| May 17, 6:33 PM CDT | Severe Thunderstorm Warning | FSD | 57 min |
| May 17, 7:20 PM CDT | Severe Thunderstorm Warning | FSD | 28 min |
| May 17, 8:00 PM CDT | Severe Thunderstorm Warning | FSD | 45 min |
| May 17, 8:03 PM CDT | Flash Flood Warning | FSD | 3 hr |
| May 18, 5:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 18, 6:08 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| May 19, 2:43 AM CDT | Frost Advisory | FSD | 29 hr |
| May 24, 3:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 24, 4:53 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 24, 6:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 8:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 25, 1:12 AM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| May 25, 7:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 31, 3:20 PM CDT | Mesoscale Discussion | SPC | 2 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 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 10 |
| Flooding | |
| Flash Flood Warning | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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.