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A vivid rainbow accompanied by mammatus (mamma), spotted from the National Center for Atmospheric Research’s (NCAR) Mesa Laboratory, near Boulder, Colorado, US
A primary and secondary rainbow that includes Alexander's Dark Band, an area that appears dark because the raindrops in that region are refracting sunlight at angles that do not direct any light toward the observer, as seen here over Sittingbourne, Kent, England
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A primary bow and the beginning of a subtle secondary bow, spotted over Sanxia, New Taipei City, Taiwan
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A primary rainbow with a faint secondary bow, spotted over Newcastle upon Tyne, England
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A primary and secondary bow spotted near Sumirago, Varese, Italy
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A primary and secondary bow spotted by Rafael's friend, Cindy Tang, over Changchun, China
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Rainbow over Schlossborn, Taunus, Germany
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In sharply defined rainbows, a set of narrow coloured bands can often be found repeating on the inside of the primary bow. Called supernumerary bows, they add an extra-special dimension to the display and are produced by diffraction as light waves cross each other exiting the raindrops, as seen here over Amsterdam, Netherlands.
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A primary and secondary rainbow spotted late in the day over Northern California, US
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Rainbow spotted over Lusk Village, County Dublin, Ireland
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Rainbow over Manchester, Connecticut, US
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It looks calm, but Monica conveyed that it was very windy when she found the perfect place to pull her car over and take this photograph of the full rainbow over Mono Lake, California, US
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A primary rainbow along with a subtle secondary rainbow over Atagohama Central Park, Fukuoka City, Japan
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A primary rainbow and a subtle secondary rainbow spotted during a storm near Mercogliano, Italy
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Supernumerary bows, which consist of tiny fringes inside the primary bow, along with a subtle secondary bow, spotted near Zeebrugge, Belgium
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Rainbow reflected in the water over Goose Bay, Labrador, Canada
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