Multiple tower upward lightning flash captured at 9,000 images per second in Rapid City, SD on 6/16/10. A preceding downward positive ground flash triggers upward leaders from seven towers, three of which are visible in the video.
I never realized how much lightning varies in speed. The pokiest bolt on the lefthand side happens over a third of a second in realtime, about the speed of a blink. (via totes)
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