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A view from above the clouds of what appears to be pileus, spotted over Spain
A notable storm system accompanied by pileus, spotted from a regional train just north of Sydney, Australia
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Signs of pileus at two different levels of this multi-faceted cumulonimbus, spotted over Mesa, Arizona, US
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Gale force winds accompanied by a cap cloud, which is a form of pileus, characterized by a smooth, almost lenticular-like appearance on top of a cumuliform tower and/or an isolated mountain peak, as seen here over the Faroe Islands.
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Pileus spotted over Belgium
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Pileus spotted over Canberra, ACT, Australia
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Pileus are small, horizontal clouds that form above cumulus or cumulonimbus clouds, due to rising air that condenses into a smooth shape upon reaching its dew point, and this formation is usually an indicator of severe weather. This classic example was spotted over Bethesda, Maryland, US.
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Pileus spotted over Willawong, Queensland, Australia
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Pileus, also known as a cap cloud, can develop above rapidly rising cumulus or cumulonimbus clouds, as spotted here by Genevieve's father during an evening walk in Minneapolis, Minnesota, US
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Pileus spotted over Hunting Island, South Carolina, US
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A classic example of pileus spotted over Curitiba, Brazil
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Pileus with iridescence spotted over Mantua, New Jersey, US
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Pileus spotted over Cotia, Sao Paulo, Brazil
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A dynamic, mixed sky over Schleiz, Germany
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Pileus spotted over Madison, Wisconsin, US
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Pileus on a stormy day over North Devon, England
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