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Scientists' best theory for why the sky sometimes changes to a yellow or greenish hue before a severe storm is that storm clouds of a certain thickness and water concentration act as a filter for the light that passes through them, according to The Guardian. Green and yellow clouds were long considered to be an optical illusion rather than a true color change.. It is a glow-in-the-dark night sky too, colored a mix of green, yellow, and red. Its colors result from scattered sunlight, oxygen, and sodium from shooting stars.

If you've ever wondered why the sky's natural blue hue sometimes appears yellow, there's a scientific explanation for it.. When the sky is filled with storm clouds (and especially when the storm happens in the late afternoon or evening), yellow light tends to be the most visible. Sometimes, these yellow, stormy skies look pretty and golden.