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Published on Jun 26, 2016
In the above video, which stretches a third of a second to 1-1/2 minutes, leaders descend from the clouds and one on the left connects with the ground at about the 14-second mark, emitting a bright flash of light. That’s the triggering flash. Then, starting at about the 17 second mark, three strokes of upward lightning ascend from nearby radio and TV towers. The upward lightning encounters flickering paths of negative charge called recoil leaders, which spurt electrons back toward the tower and ground upon contact. Warner and his colleagues filmed this electrical storm at 9,000 images per second.