High Wind in Fall River Co., South Dakota

A slow moving low pressure system moved across western South Dakota and deepened as it moved into the eastern portions of the state while high pressure pushed in over the Rocky Mountains. Very strong northwest winds developed in western South Dakota and continued for nearly 48 hours. Numerous businesses had large signs blown down and billboards on the interstate were broken at their bases. Airlines cancelled flights into and out of Rapid City due to the high winds. Numerous power outages were also reported due to trees falling across the power lines.