Sam tells me that he made the photo by stacking 23 frames, and simply decreased saturation. He explains that it took about 30 minutes to catch the storm. He used a Canon 5D Mark III paired with a Canon 24-70mm f/2.8, a Manfrotto 055XPROB tripod, “and commons sense,” he adds. When the rain flushed the roof he was standing on, he wrapped it up and left.