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It derives from an older phrase. "Dropping out of the clear blue sky" The meanings are simmilar. Alternate answer: Lightning, the voltage is so great off the top of a cumulonimbus cloud (thunder cloud) lightning can travel 20 plus miles and strike ahead of the storm while the sky is still clear and blue. Thus, the saying "out of the clear blue" or "out of the blue" Every now and then you hear of someone getting struck and killed by lightning with a clear blue sky.

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Q: What is the Origin of the phrase out of the blue?
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