"Halo around the sun or moon, rain or snow soon."
The halo around the moon is a layer of cirrus clouds made of ice crystals which act like tiny prisms, forming a white halo around the moon. This cirro-stratus cloud may indicate an approaching warm front, an area of low pressure. There is a higher probability of rain or snow after a halo is seen; the brighter the circle, the greater the probability. (Click on photos to enlarge them.)
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