Each material ends in a two-digit number. That is the wind speed in knots. They are all square numbers (n times n). Each is more complex than the previous, having more layers of clouds nodes added together.

This is bbocean-04.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)