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I agree, there is not much that can ruin a day at the beach. I think the flash only happens with just the right conditions, and the weather has to be very clear, with no haze, etc, as I understand it. Keep looking, one day soon it will happen. (It's hard to keep your eyes open for so long while staring at the sun...)

Thank you my friend, for your interaction and your encouragement. I will keep looking for that flash! :)