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A notable storm system accompanied by pileus, spotted from a regional train just north of Sydney, Australia
Signs of pileus at two different levels of this multi-faceted cumulonimbus, spotted over Mesa, Arizona, US
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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, 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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A classic example of pileus spotted over Curitiba, Brazil
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Pileus spotted over Curitiba, Brazil
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A classic example of pileus forming over a developing cumulonimbus, spotted over Kilgore, Texas, US
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Cumulus congestus that appears to be on the verge of developing into a cumulonimbus, with a classic example of pileus over the top of its formation, spotted near Tuggeranong, Australian Capital Territory, Australia
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Pileus over Waukesha County, Wisconsin, US
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Pileus accompanying a Cumulus congestus cloud formation above Charlotte, North Carolina, US
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Cloud caps known as pileus forming over the tops of Cumulus congestus clouds and spotted over Little Switzerland, North Carolina, US.
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The distinctive breaking-wave shape of a fluctus cloud feature was spotted here along the top of the accessory cloud cap known as a pileus. This is a rare combination of features, spotted over Franklin County, AL, US.
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Pileus over Launceston, Tasmania.
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A trio of Cumulus congestus with pileus caps over Maplewood, Missouri, US
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Pileus over Waterton Lakes National Park, Alberta, Canada.
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Pileus over Wolf Creek, Montana, US.
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