Red sky in the morning, Sailor's take warning. Red sky at night, Sailor's delight. It was referenced in the bible in Matthew, and in Shakespeare. It refers to the fact that red has the longest wavelength in the color spectrum- and reflects the dust of passing and coming storms. Red Sky at Night-means high concentrations of dust particles and high pressure- stable air = good weather. Red Sky in the Morning-dust of a storm just passed, moving to the East. Blazing Red Sunrises mean high H2O content-rain on the way.
Library of Congress