However it still doesn't answer my question, and nor have you.
Jazuela's suggestion is fine for the weather system used by the typical stock mud - a simple state machine where weather is either rainy, cloudy, sunny, or whatever. But when you're talking about actual weather patterns you cannot describe them without losing a vast amount of detail, something which is hardly appropriate when the character could realistically just look up at the sky and view the clouds for themselves.
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