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Simulated lightning strike to a sailboat model in lab. Institution för Hopspänningsforkning, Husbyborg, Uppsala, Sweden. Engineer - Eric Löfberg (1991).Lightning occurs when a large electrical charge builds up in a cloud, probably due to the friction of water and ice particles. The charge induces an opposite charge on the ground, and a few leader electrons travel to the ground. When one makes contact, there is a huge backflow of energy up the path of the electron. This produces a bright flash of light, and temperatures of up to 30,000 degrees Celsius.