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Optical Effects
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Cirrostratus over Heemskerk, Netherlands
Lunar iridescence over Kirkkonummi, Finland
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Iridescence over National Taipei University, Taiwan
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Altocumulus at dusk with a comet in view over Southern Alberta, Canada
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Circumzenithal Arc accompanied in the sky by altocumulus undulatus over Ahrenshoop, Germany
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A mix of stratocumulus and altocumulus over New Taipei City, Taiwan
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Crepuscular Rays over Kalenberg, Belgium
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Stratocumulus with low-lying stratus over Sapporo, Hokkaido, Japan
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Cumulus congestus with some signs of supercilium spotted over Dongnae-gu, Busan, South Korea
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Cumulus humilis over northern Iran
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Crepuscular rays emanating from behind an early morning storm over the Atlantic Ocean, as viewed from Boca Raton, Florida, US
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Cirrus and altocumulus over New Taipei City, Taiwan
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Cirrus spissatus spotted over Wustrow, Germany
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A view of the clouds between buildings in New Taipei City, Taiwan
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Sunrise with an abundance of altocumulus lenticularis over the Adirondack Mountains, Vermontville, New York, US
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A classic example of asperitas, which can be likened to a more extreme form of undulatus. Asperitas differs from undulatus by the fact that its waves are more chaotic and disorderly, lacking any of the regularity and organisation typical of undulatus. This asperitas formation was spotted over Amesbury, Massachusetts, US.
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