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Altocumulus lenticularis undulatus over Northwest Iran
Multiple displays of altocumulus lenticularis, including an example of lenticularis duplicatus, which is also known via the French term, 'pile d'assiettes', for a 'stack of plates'. These classic examples of lenticularis were spotted near Antelope Valley, California, US.
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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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Altocumulus lenticularis spotted over Jokulsarlon, a glacial lagoon bordering Vatnajokull National Park in southeastern Iceland
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Altocumulus lenticularis over Pietracorbara, Corsica, France
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Altocumulus lenticularis by way of a stacked form, also known as pile d'assiettes, spotted in multiple places over Mercogliano, Italy
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A classic example of a cap cloud, a particular example of an altocumulus lenticularis, forms as a stable airstream rises to pass over a peak, cooling as it does so. Deborah's son, Peter, spotted this unique cloud formation over what appears to be Mt. Adams as he was on a plane coming in to land at Portland, Oregon, US
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These lens-shaped orographic wave clouds, known as altocumulus lenticularis, form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. If there is enough moisture in the air, the rising motion of the wave will cause water vapour to condense, forming the unique appearance of lenticular clouds. This classic example was spotted near Narbonne, France.
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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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Classic example of an Altocumulus lenticularis duplicatus, also known as "pile d'assiettes", spotted over Langfjordbotn, Finnmark, Norway.
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Altocumulus lenticularis undulatus during sunset over the Southern Alps near Christchurch, New Zealand
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Altocumulus lenticularis over the Eastern Sierra Mountains, spotted while driving south towards Bishop, California, US
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Altocumulus lenticularis in multiple variations, as well as in a stacked form, which is known as Pile d'assiettes, over the North Lake District, Cumbria, England.
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Altocumulus lenticularis on abundant display over Winthrop, Washington, US
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Altocumulus lenticularis over Svalbard, Norway
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A stacked form of Altocumulus lenticularis, also known as Pile d'assiettes, spotted at sunset over the Upper Wenatchee River in Plain, Washington, US.
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