National Weather Service United States Department of Commerce

There is a Slight (level 2 out of 5) risk for severe storms over portions of central and eastern SD from mid afternoon through this evening. The storms are expected to develop around/between the Missouri and James Rivers between 2 and 5pm, then move eastward across the rest of eastern SD and into western MN during the evening. The primary threats for these storms will be wind gusts of 60-70 mph and large hail 1-2” in diameter. A tornado or two is also possible. With the heavy rain associated with these thunderstorms, localized flash flooding is also possible, especially for locations that have received rain over the last several days.
The primary threat for today will be hail of 1-2" in diameter, with the potential for a few larger hail stones. As the thunderstorms move east, the threat for winds of 60-70 mph increases and there is also the potential for a tornado or two. The timing for the thunderstorms will be during the 2 to 5 PM CDT time frame over central SD, then the storms will move eastward through the rest of the afternoon and evening, departing the area by midnight.
Lingering showers and a few thunderstorms are possible this morning, before additional storms develop this afternoon (starting between 2-5 PM CDT). The storms will then move eastward with time through the evening. The storms are expected to exit the area by midnight.
There is a Slight (level 2 out of 5) risk for severe storms across the southern three fourths of South Dakota and into western MN on Thursday. A Marginal (level 1 out of 5) risk covers the rest of northern SD. The storms are expected to occur from Mid Afternoon and into the Evening, while rain could continue into the overnight hours. Primary threats in the Slight Risk area are hail of 1-2” in diameter and wind gusts of 60 mph.