Sioux Falls, SD – Drivers along I-90 and I-29 could face sudden whiteout rain, 70 mph wind gusts, and large hail as storms fire up by 2 p.m. Monday and intensify into the early evening commute.
According to the National Weather Service in Sioux Falls, scattered thunderstorms are expected to develop between 2 p.m. and 9 p.m., with a 50 to 60 percent chance of storms becoming severe. The highest risk sits near and north of I-90, including Sioux Falls, Brookings, and areas toward Marshall and Worthington.
Hail up to golf ball size and wind gusts near 70 mph pose the primary hazards. These conditions can dent vehicles, shatter windows, and down tree limbs, especially along exposed stretches of I-29 and rural highways. While tornado development is not likely, it cannot be fully ruled out in isolated cells.
Communities including Mitchell, Madison, and Pipestone may see rapidly changing conditions with little warning. Outdoor plans could be disrupted quickly, and power outages are possible where stronger wind cores develop.
Residents are urged to secure loose outdoor items, move vehicles under cover, and avoid unnecessary travel during active storms. Keep multiple ways to receive warnings, especially during the late afternoon and evening hours.
Storm chances taper after 9 p.m., but additional advisories may be issued if storm intensity increases.
