Mark 4:37
A furious squall came up, and the waves broke over the boat, so that it was nearly swamped — the Sea of Galilee is notorious for sudden, violent storms caused by the topography: cool air from the surrounding mountains meeting warm lake air can produce severe, fast-developing storms. The waves breaking over the boat and the near-swamping communicate genuine danger, not merely discomfort. These are experienced fishermen who know this lake — their terror in the next verse is not hysterical but professional: they recognize a life-threatening situation.