Uncommon Knowledge: Does “red sky at morning” really predict rain?

It’s a familiar old rhyme that we don’t take much stock in any more: “Red sky at night, sailors’ delight; red sky at morning, sailors take warning.” But, for an age before satellite imaging, the rhyme contained some solid meteorological truth. The red sky mentioned is not just sunset or sunrise. As the sun rises in the east, if the sky around it is clear enough for its rays to reach the clouds in the west, it makes them glow red. That combination of clear and cloudy sky suggests that a weather front is moving through. Since most storm systems move from west to east, a red sky at morning shows clouds moving in from the west, while red sky at night is the result of clouds rolling safely away into the east.

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Written by Nathan

Nathan is a copywriter, who helps create our product descriptions as well as our weekly emails. He is also a nationally award-winning musical theater writer, whose work includes an adaptation of Lois Lowry’s novel The Giver. Nathan has also been a classical violinist, tutored Kazakhstani jewelers in entrepreneurship, created large-scale games played across entire city blocks, served as a missionary in South Korea, conducted experiments in sonoluminescence, co-founded an exotic fruit-growing business, was a theater critic for Tucson Weekly, and as a teenager composed a women’s jazz quartet that is currently performed around the world.

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