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Pileus spotted over Canberra, ACT, Australia
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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Pileus on the tops of cumulus congestus, spotted over Madison, Wisconsin, US
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A large cumulus congestus cloud formation that Bronwyn was hoping would produce some rain following a spell of hot weather, but it dissipated without leaving any rain in its wake, spotted near Pittsboro, North Carolina, US
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Pileus spotted over Curitiba, Brazil
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Cumulus congestus with pileus above, as seen from an airplane along the East Coast of North America
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Pileus over Parkersville, United States
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