Galen Zumbach of Creston, Iowa, begins the cleanup process with the help of neighbors and friends after his house was hit by a tornado on Sunday. Strong winds and tornados swept through parts of the northern edge of Creston, also damaging the Greater Regional Medical Center. The storms were part of a larger system that affected areas from northern Nebraska and Iowa south through Oklahoma.[url='http://videos.howstuffworks.com/science/tornado-videos-playlist.htm'] Video Playlist: Tornado Videos »[/url]