The impact does the storm have on the plot is that it makes Cassius more confident about what he has in mind.
What is storm?
A storm is known to be a kind of harsh meteorological event or happening where there is heavy rain, and wind as a result of moisture in the air.
A storm in a passage can connote a big event and the impact of the storm on the plot is that it makes Cassius more confident about what he has in mind.
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