Severe Thunderstorm Warning — Union County, South Dakota
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Current Status
⛈️ Active: Severe Thunderstorm Warning
Severe Thunderstorm Warning issued August 12 at 4:38AM CDT until August 12 at 5:15AM CDT by NWS Sioux Falls SD
At 438 AM CDT, severe thunderstorms were located along a line extending from near Elk Point to near Ponca to near Emerson, moving east at 45 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Sioux City, North Sioux City, Jefferson, Hubbard, Jackson In Dakota County, South Sioux City, Homer, Dakota City, Sergeant Bluff, Salix and Lawton.
Effective August 12, 2026 at 5:38 AM ET · Expires August 12, 2026 at 6:15 AM ET
Event Details
Event Type
Severe Thunderstorm Warning
Severity
severe
Issued By
NWS Sioux Falls SD
Expires
August 12, 2026 at 6:15 AM ET
Last Checked
3 hours ago
What To Do
📋 Official NWS Guidance
For your protection move to an interior room on the lowest floor of a building. To report severe weather contact your nearest law enforcement agency. They will send your report to the National Weather Service office in Sioux Falls.
Also In Effect For
This same Severe Thunderstorm Warning also covers:
Other Active Alerts in South Dakota
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Warning
Severe Thunderstorm Warning
Get Severe Thunderstorm Warning Alerts for Union County
StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
Frequently Asked Questions
What does a Severe Thunderstorm Warning mean for Union County, South Dakota?
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Is this Severe Thunderstorm Warning currently active?
Yes — this alert is active as of our last check (3 hours ago). It's set to expire August 12, 2026 at 6:15 AM ET.
How do I get notified about Severe Thunderstorm Warning alerts for Union County?
Download StormCast free on Google Play and set Union County, South Dakota as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Severe Thunderstorm Warning is also in effect for Plymouth County, Woodbury County, Dakota County, Dixon County.