Upward lightning flashes in winter frequently damage wind turbines in the coastal area of the Sea of Japan. Aspects of initiation of upward leaders of such flashes of winter lightning were investigated by using optical images recorded by 30 fps digital video cameras at 12 wind turbines. Moving blades generate upward flashes more likely than stationary blades. Among the 252 analyzed upward flashes, only one flash was confirmed to be initiated not from the tip part of a blade.
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