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Other Clouds
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Optical Effects
- 22° Halo
- 46° Halo
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- Wegener arc
A grand display of virga, following a day that Martha described as being filled with cirrus uncinus, spotted over Asheville, North Carolina, US
Cirrus spissatus, which is a thick cirrus cloud, is often accompanied by other species of cirrus clouds within close proximation. These clouds can be formed by a conglomerate of cirrus clouds at high altitudes, and separate from that origin, they can also form from the remnants of a dissipating thunderstorm that once had a fibrous top. This example of cirrus spissatus was spotted over Thumrait, Southern Oman, near the Yemeni border.
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Cirrus uncinus over Charlotte, Michigan, US
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Cirrus uncinus over Sanxia District, New Taipei City, Taiwan
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Circumhorizon Arc, which is an optical effect that is caused by ice crystals in the sky acting as tiny prisms that refract and reflect the light, and it appears as a bright, flat band of colours parallel to the horizon. When cirrus clouds are present, they act as a canvas for the circumhorizon arc, causing it to become fragmented. This classic example was spotted over Rosenheim, Germany.
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Circumzenithal Arc accompanied in the sky by altocumulus undulatus over Ahrenshoop, Germany
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Circumzenithal Arc over West Caldwell, New Jersey, US
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A vibrant display of Cirrus unicnus, which in Latin means "curly hooks". This type of high-level cloud is also known as mares' tails, as spotted here over South Portland, Maine, US.
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Cirrus vertebratus spotted over Hammersmith, West London, England
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Cirrus uncinus over Vermontville, New York, US
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Cirrus uncinus over Merano, Italy
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Cirrus vertebratus spotted over Crawley, West Sussex, England
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Fallstreak holes over Cotia, São Paulo, Brazil
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Cirrus spissatus over Fairy Meadow, New South Wales, Australia
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Cirrus uncinus over Diamond Bar, California, US
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A grand display of Cirrus vertebratus radiatus over Brean, Somerset, England
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