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Launching weather balloon with field mills into an approaching electrical lightning storm.. Langmuir Atmospheric Research Lab on Mt. Baldy, New Mexico (1992) 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..