Found this on YouTube:
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.
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.