What does it mean A RING AROUND THE MOON?
Halo phenomena occur all round the world and the commonest is the 22° halo which is the ring round the sun or the moon. The next most commonly see would be parhelia or sundogs which are brightly coloured spots either side of the sun on the 22° halo. In polar regions you can see some spectacular halo displays with many different rings and arcs. Whether the ring round the sun or the moon is an indicator of weather to come depends entirely on where you are. Cirrostratus cloud, which produces the ice crystals that make the halo, is a forerunner of warm fronts in high latitudes such as most of Europe, northern USA and Canada. Warm fronts often bring rain. In lower latitudes such as the southern USA and Australia, warm fronts are seldom seen. Cirrostratus cloud is an indicator of moisture high in the trpopsphere but it is not necessarily an indicator of rain to come.
