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Optical Effects
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Altocumulus undulatus over London, England
Altocumulus undulatus radiatus over Nokonoshima Island, Fukuoka City, Japan
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Altocumulus undulatus over Fleet, Hampshire, England
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Cavum (Fallstreak Hole) spotted over Lynchburg, Virginia, US
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Altocumulus lenticularis undulatus over Northwest Iran
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Asperitas over Winnipeg, Manitoba, Canada
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On a windy and exhilarating hike, Heather witnessed the development of this cap cloud, which forms as a stable airstream rises to pass over a peak, cooling as it does so. It is a particular variation of a lenticularis cloud, in which the cloud lies over the mountaintop, rather than downwind from it. This classic example was spotted from the Mount Fremont lookout at Mt. Rainier National Park, Seattle, Washington, US.
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An expansive display of altocumulus stratiformis undulatus over Portimao, Algarve, Portugal
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Altocumulus stratiformis undulatus, also known as a "mackerel sky", spotted over Wiesbaden, Germany
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Circumzenithal Arc accompanied in the sky by altocumulus undulatus over Ahrenshoop, Germany
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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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A classic example of multiple Altocumulus lenticularis, spotted over Piz Mezzaun in the Livigno Range of the Alps, near Engadina, Switzerland
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A classic and expansive display of Altocumulus stratiformis undulatus, also known as a "mackerel sky", spotted over Wareham Forest, Dorset, England
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Altocumulus lenticularis undulatus during sunset over the Southern Alps near Christchurch, New Zealand
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Mamma (Mammatus) following the passage of a summer thunderstorm which Nick said ushered in cooler air over Palma, Mallorca, Spain
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Asperitas over North Norfolk, England
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