Severe Thunderstorm Warning for Northwestern Iowa and Southeastern South Dakota
This alert is no longer in effect.
NOAA issued it on September 2, 2026, 2 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Sioux Falls has issued a Severe Thunderstorm Warning for multiple counties in Iowa and South Dakota until 10:15 PM CDT on September 1.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Northwestern Iowa and Southeastern South Dakota
- Issued
- September 2, 2026
- Issuing authority
- NWS Sioux Falls SD
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: historical. It was issued 2 days ago; use the issuing agency's live warning service for current conditions in Northwestern Iowa and Southeastern South Dakota.
Alert Details
A Severe Thunderstorm Warning was issued by the National Weather Service in Sioux Falls SD at 9:24 PM CDT on September 1, 2026. The alert is effective from 9:24 PM CDT until 10:15 PM CDT on September 1, 2026.
Affected Areas
The warning covers south central Lyon County in northwestern Iowa, Sioux County in northwestern Iowa, northern Plymouth County in northwestern Iowa, eastern Clay County in southeastern South Dakota, southern Lincoln County in southeastern South Dakota, and Union County in southeastern South Dakota. Severe thunderstorms were located along a line extending from Beresford to 7 miles south of Union Grove State Park, moving east at 50 mph. Locations in the path include Akron, Alcester, Hawarden, Hudson, Ireton, Craig, Rock Valley, Maurice, Struble, Sioux Center, Orange City, and Hull.
What You Should Do
For protection, move to an interior room on the lowest floor of a building. To report severe weather, contact your nearest law enforcement agency.
Expected Conditions
At 9:23 PM CDT, severe thunderstorms were observed with 70 mph wind gusts and half dollar size hail (1.25 inches). A 59 mph wind gust was reported 1 mile southeast of Vermillion. Hail damage to vehicles, considerable tree damage, and wind damage to mobile homes, roofs, and outbuildings are expected.
Timeline
The warning is in effect until 10:15 PM CDT on September 1, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,405 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 2, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.