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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
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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Altocumulus Lenticularis accompanied by a pink hue at sunset over Dinas Mawddwy, Wales
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An impressive collection of Altocumulus lenticularis cloud formations over Aberfoyle, Scotland
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Altocumulus lenticularis hovering over Mt. Cook, New Zealand
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Classic UFO-like Altocumulus lenticularis over Catlar, France.
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A classic cap cloud forming over Mount Rainier, Washington, US.
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