It looks like a rainbow that's been set on fire, but this phenomenon is as cold as ice. Known in the weather world as a circumhorizontal arc, this rare sight was caught on film on June 3 as it hung over northern Idaho near the Washington State border (map of Idaho). The arc isn't a rainbow in the traditional sense?it is caused by light passing through wispy, high-altitude cirrus clouds. - national
Chemtrails? ;-)
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