Thursday 7 August 2014
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. Source
