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What really cool conditions here. This is a very dramatic shot, and the faster shutter speed with the look that gives to the water really adds to it.
As for the Lightning, the only time I have gotten some good lightning shots was this last summer out in the desert, and ended up doing the same as you because I could see a pattern too. So I just kept the remote release pressed down. I shot a couple of hundred shots and I got 2 nice shots and one marginal. Now the funny thing was that on the LCD I couldn't see the lightning strikes, it was only when I got back home that I saw them. So when I was out there I left thinking I had missed my chance at lightning strikes again!