Hailstorm

S1, E3: The documentary, Return of the Plagues, follows individual researchers in Germany, Austria, and Colorado who are trying to determine the conditions that cause these disasters, laying the groundwork for possibly controlling them in the future, or at least making more reliable predictions. Scientists study the dramatic sequence of events in a landslide or a flood, and they test man-made structures that are meant to withstand the enormous power of these mountains. In Styria, hail pilots fly small propeller aircraft into menacing thunderclouds, in order to manipulate the weather.