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An extremely rare rainbow-colored pileus iridescent cloud over Ethiopia.

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Photographer captures rare 'fire rainbow cloud' above Florida as Mother Nature puts on spectacular light show

Circumhorizon arc. On sunny afternoons, cumulus clouds boil upwards, pushing layers of moist air above them even higher where they cool and condense to form cloud caps or 'pileus' (Latin for cap). When pileus clouds form very quickly, their water droplets tend to be all the same size, the perfect condition for iridescent colors.