<P> The common phrase "red sky at morning" is a line from an ancient rhyme often repeated by mariners: </P> <P> Red sky at night, sailors' delight . Red sky at morning, sailors take warning </P> <P> The rhyme is a rule of thumb used for weather forecasting during the past two millennia . It is based on the reddish glow of the morning or evening sky, caused by haze or clouds related to storms in the region . If the morning skies are red, it is because clear skies over the horizon to the east permit the sun to light the undersides of moisture - bearing clouds . The saying assumes that more such clouds are coming in from the west . Conversely, in order to see red clouds in the evening, sunlight must have a clear path from the west, so therefore the prevailing westerly wind must be bringing clear skies . </P> <P> There are occasions where a storm system might rain itself out before reaching the observer (who had seen the morning red sky). For ships at sea however, the wind and rough seas from an approaching storm system could still be a problem, even without rainfall . </P>

Where does red sky at night come from
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