After spending a year in Kansas as an exchange student in 2003, Christoffer heard stories from friends about how storms and tornadoes had affected them. "It really caught my interest," he says. "A few years later I found some amazing videos on YouTube and it really opened my eyes to the amazing things that can happen during a powerful supercell storm. Tornadoes, amazing storm structures, weird clouds, incredible colours, hail the size of oranges, etc."