Sioux Falls, South Dakota – Large hail, damaging winds, and isolated tornadoes could hammer parts of South Dakota today, with the most dangerous storms expected after 3 p.m.
According to the National Weather Service in Sioux Falls, thunderstorms will develop along a cold front late Tuesday afternoon and continue into the evening. Some storms may become severe, producing hail up to 2 inches in diameter and wind gusts near 70 mph. The strongest cells could also produce isolated tornadoes, especially in areas along and south of Interstate 90. Flash flooding is possible in urban or low-lying areas.
Residents in Sioux Falls, Brookings, and Vermillion should charge devices, secure outdoor items, and stay alert for warnings. Spotter activation is expected between 3 and 10 p.m. tonight to monitor conditions. Drivers are urged to avoid travel during severe weather windows, particularly along I-29 and I-90 corridors.
As storms move out overnight, drier weather returns briefly before another chance of rain Wednesday. By Juneteenth, high temperatures will spike into the 90s, with heat indices nearing 100°F in some areas through the weekend.
🔭 5-Day Weather Forecast for Sioux Falls (June 17–22)
Sunday, June 22: High 87°F – 50% chance of thunderstorms, partly cloudy skies
Tuesday, June 17: High 77°F – Severe thunderstorms after 3 p.m., hail and tornado risk
Wednesday, June 18: High 78°F – Isolated showers early, turning mostly sunny by afternoon
Thursday (Juneteenth), June 19: High 91°F – Sunny and breezy, gusts up to 20 mph
Friday, June 20: High 94°F – Mostly sunny, heat index near 100°F
Saturday, June 21: High 97°F – Hot, mostly clear overnight with low around 75°F
