At the higher levels, winds flowed from the southwest to the northeast in relation to the jet stream; however, closer to the surface, the inflow from the low pressure system over South Dakota resulted in a south to north flow, allowing for rotation within storms.
In the upper atmosphere, winds moved from the southwest to the northeast relative to the jet stream. Near the surface, the air flowing into the area due to the low pressure system over South Dakota created a south-to-north movement, which enabled storm rotation.