What is the basic idea of "seeing the weather from the clouds"

This paper is clear in thinking and closely related to the topic, which not only shows that we can know the weather by looking at clouds, but also further shows that clouds are closely related to weather changes, from saying that clouds are the "signboard" of weather changes to saying how to know the weather by looking at clouds. There are many kinds of clouds, but the article starts with the phenomenon and then touches on the essence of things. For example, the shape and luster of clouds are phenomena, and the relationship between clouds and weather changes is the essence. Explain the hierarchy clearly, explain the matter of "knowing the sky from the clouds" clearly, and finally explain the purpose of knowing the sky from the clouds clearly.

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