Actually, I think the word determine is being used here in both cases in the sense of "to decide" or "to resolve".  The difference is: in the first case, Zeus is deciding what the weather will be (as it is under his direct control), and in the second case, the weatherman is deciding what the weather should be (a prediction).

Which definition is more used for "determine"?
What is the significance of the time it takes to say Shalom Alecha Rebbi (U'mori)?
