Sioux Falls, South Dakota – Severe thunderstorms are expected to rumble across southeast South Dakota Thursday evening, with the most intense activity likely south of Highway 18 between 5 and 11 p.m. Large hail and damaging winds are the main threats, especially near the Iowa and Nebraska borders.
According to the National Weather Service in Sioux Falls, clusters of strong storms will form over northeastern Nebraska this afternoon and move into northwestern Iowa and southeastern South Dakota by evening. A Level 2 (Slight Risk) warning is in effect for areas including Yankton, Vermillion, and parts of Union County.
Residents should prepare for gusts over 70 mph and hail up to golf ball size. The storm system may also bring brief heavy downpours and lightning as it tracks east-southeast overnight.
Travelers along I-29 and Highway 18 should stay alert for sudden changes in visibility and road conditions. Those in mobile homes or without storm shelters are urged to identify safe shelter locations in advance.
Stay tuned to local alerts, NOAA Weather Radio, or the NWS app as watches or warnings may be issued throughout the evening.
📅 Five-Day Forecast: Sioux Falls, SD
- Thursday: Severe storms possible south of Hwy-18. High 85°F. Windy, evening storms.
- Friday: Mostly sunny, cooler. High 78°F. Low 60°F.
- Saturday: Isolated showers early. Partly cloudy later. High 80°F.
- Sunday: Sunny and pleasant. High 82°F.
- Monday: Dry and warm. High 86°F. Breezy afternoon.
