The metaphor of the oncoming storm means that something spectacular that may cause a stare is going to happen while cloudless sky means something is yet to manifest or show up.
A metaphor is known to be a figure of speech that is when a word or phrase is said to connote one kind of object or action is often used in place of another to tell  a likeness between them.
Note that The metaphor of the oncoming storm or cloudless sky means that something spectacular that may cause a stare is going to happen.
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