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Mamma (Mammatus) over Neustadt in Sachsen, Germany
Mamma (Mammatus) spotted over Las Vegas, Nevada, US
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Signs of both mamma (mammatus) and asperitas in this view over Antelope Valley, California, US
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Mamma over Yarra Glen, Australia
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Mamma (Mammatus) spotted over Boise, Idaho, US
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Mamma (Mammatus) accompanied by a thunderstorm near Brisbane, Australia
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Mamma over Alto, United States
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Mamma (Mammatus) over Canberra, New South Wales, Australia
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Mamma (Mammatus) over Canberra, ACT, New South Wales, Australia
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Mamma (Mammatus) clouds following tornado activity near Oklahoma City, Oklahoma, US
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Mamma (Mammatus) over Mercogliano, Italy
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Mamma (Mammatus) clouds at sunrise over Casper, Wyoming, US
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Rows of mamma (mammatus) over Salle, Norfolk, England
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Mamma (Mammatus) over Esfahan, Iran
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Although mamma (mammatus) usually form on the base of a cumulonimbus anvil, they can also form on other cloud types such as stratocumulus, altostratus, or in this case, in a subtle way within altocumulus, spotted here over Monte Porzio Catone, Rome, Italy.
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