A Fire Rainbow Fire rainbows appear when sunlight hits frozen ice crystals in high-altitude cirrus c
A Fire Rainbow Fire rainbows appear when sunlight hits frozen ice crystals in high-altitude cirrus clouds. Because the fire rainbow actually involves no rain at all, scientists would rather we refer to this occurrence by its much less fun, but much more accurate title: the circumhorizontal arc. Since the arc requires both the presence of cirrus clouds and for the sun to be extremely high in the sky, it’s much more likely to be seen at latitudes closer to the equator. Conditions might be right for a fire rainbow in Los Angeles six months out of the year, but in a more northern city like London, that window drops to a mere two months. Photo: National Geographic June 19, 2006. Taken in Idaho. -- source link
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