Orlanth is not the god of storm. He IS storm. Great Orlanth is all the Air, for example. (Or at least, pretty damn close to all of it). He holds some of the greater principles of the universe - but really he IS that principle.
To have a certain amount of control over all the weather in Glorantha is about a 10w9 - wihch is the power of a greater god. It has at _lease_ once before in Glorantha. But it takes work, luck and the god NOT noticing what you are up to (can't think of a better reason for divine wrath off hand)...
Creating something like Osentelka (who instantly seemed to break down into Nysalor/Gbaji) would probably require magics and esoteric toys to transcend Glorantha. The rituals took decades and the powers used were incredible. 10w12? What do you need to Transcend a world with mysticism? (I personally think that Osentelka was mystic rather than divine).
A local godlet is only a 10w4 and hence more easily controled - and has a much smaller area of influence. Smaller ones exist and can be controlled by a magician who knows his stuff.
Sorry, that got a little esoteric.
Jeff
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