Circumhorizon arc: A beautiful optics display in the sky.

circumhorizon_cirrus_568.jpg.CROP.original-originalBut as phenomenal as the canyon was, I got a big surprise when I looked up, not down. As I was driving to a spot where we could eat lunch, I glanced out my car window and saw a bright flash of color in the sky. I thought at first it was a sundog: a rainbow-patterned teardrop shape in the sky caused by ice crystals in the clouds breaking up sunlight into its component colors. But then I saw the colors extended well off to the side, and I suddenly realized what I was seeing: a circumhorizon arc (sometimes erroneously called a fire cloud, and no, they can’t foretell earthquakes).

via Circumhorizon arc: A beautiful optics display in the sky..

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