Who does macbeth say can set loose these storms?

The witches

Explanation:

In Act 4, scene 1, Macbeth talks to the witches. He states that he knows the witches can set loose these storms. He also describes the damage that the storms cause. The witches are among the most important characters in the play Macbeth. They are the ones who reveal the prophecy to Macbeth, and ultimately lead him towards a negative and dangerous destiny.

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