When weather moves west to east, a red sky at night means that there are clouds overhead, but clear skies to the west — which tells you that the weather will likely be clearing up.. Have you ever heard the adage, "red sky at night, sailor's delight"? Learn more about the science behind this weather folklore and what causes a beautiful red sky. Plus, we'll share other weather sayings and their meaning.
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"Red sky at night, sailor's delight. Red sky in morning, sailor's warning" is real science. Here's how dust, atmospheric pressure and light scattering can help you predict the weather.. Red sky at night The concept of "Red sky at night, shepherd's delight. Red sky in the morning, shepherd's warning" first appears in the Bible in the book of Matthew. It is an old weather saying often used at sunrise and sunset to signify the changing sky and was originally known to help the shepherds prepare for the next day's weather.