This saying comes from a sudden and un-expected squall on an otherwise perfect day with clear blue sky. In such conditions a ship is likely to have full sail and would not be able to shorten them quickly. If gusts of wind catch a ship in full sail it can be devastating. Such things happen regularly if sailing leeward to a range of hills. Even a gentle breeze on a perfect day can turn violent as it spins off the top of a hill and could hit a vessel from any direction.
By SailingQuiz November 2019 Category: Nautical Saying
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What does Out of the blue mean?
What is the nautical origin of the phrase "Out of the blue"?
Definition of the nautical phrase "Out of the blue".