Film-maker and adventurer Chris Terrill confronts the destructive force of nature as he explores human experiences of severe weather conditions, beginning by taking on the tornado. Braving fist-sized hail, high-speed winds and torrential rain, he starts the journey in America's Tornado Alley and risks his life to get up close to a twister as it hits the ground. Chris also hears from families whose lives have been changed by these powerful forces of nature. Chris starts his search for tornados, which can be up to two miles wide and move at 300mph, in Wizard of Oz country - Tornado Alley in America. The area stretches from the Gulf of Mexico to the Canadian border and in tornado season is hit by ferocious storms which throw out lightning, thunder, oversized hail and, sometimes, twisters.