Sioux Falls, South Dakota – Residents along the southeastern South Dakota, Nebraska-Iowa line should stay weather-aware overnight as scattered severe thunderstorms are expected to develop between 1 and 7 a.m. Tuesday, bringing the potential for large hail, damaging wind gusts, and heavy rain.
According to the National Weather Service in Sioux Falls, storms will move in from the west and southwest after midnight, primarily impacting areas south of Interstate 90. While the overall confidence in severe development remains low, forecasters warn that any stronger storm cells could quickly become hazardous. A brief tornado can’t be ruled out.
The area under the highest risk includes cities like Yankton, Mitchell, and Lake Andes, where wind gusts over 50 mph and hail over an inch in diameter are possible. Drivers on U.S. Highways 81 and 18 should use caution during early-morning commutes. Power outages or localized flooding may occur if stronger storms develop.
Officials recommend staying indoors during the peak threat window and ensuring mobile alerts or NOAA Weather Radios are active. Flash flooding could affect low-lying roads, especially with back-to-back storm cells.
Severe thunderstorm alerts remain in effect through 7 a.m. Tuesday, with additional updates expected overnight.
