The storm was designed and controlled by God to turn Jonah around. All the while, Jonah had the answer. We, too, know the One who allows storms and the One who can bring peace in the midst of troubled waters. Jonah was rebuked by an unbeliever for not sharing his God. God is in complete control over everything, over every circumstance.
Nothing happens just by chance.
God works all things after the counsel of His will. In Jonah's case, he finally gave his testimony to the sovereign God. His problem was not of unbelief, but of attitude. God had to change Jonah's attitude concerning grace toward sinners. Jonah tried to run away from God, but he never made it.