Severe weather will be increasing across South Dakota and Nebraska Wednesday evening.  All modes of severe weather will be possible.
Severe Alerts

Parts of South Dakota and Nebraska are under a Tornado Watch through this evening.  There is also a Severe T'storm Watch for Nebraska tonight until early Thursday morning.  Large hail, damaging winds and a few tornadoes will all be possible.
Forecast
 

Storms should continue into the early morning hours for parts of Minnesota and Iowa.  The severe risk will likely diminish to a damaging wind threat by early Thursday morning.
WeatherNation