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Mamma (Mammatus) spotted over Las Vegas, Nevada, US
Mamma (Mammatus) over Mercogliano, Italy
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Mamma (Mammatus) over Summonte, Italy
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Mamma (Mammatus) spotted over Bedford, England
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Mamma (Mammatus) over the Big Bend Region of Southwest Texas, US
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Mamma (Mammatus) over Arak, Markazi, Iran
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Mamma (Mammatus) tend to form on the underside of an incus associated with a cumulonimbus storm cloud. However, mamma cloud formations can occur on a range of cloud types, albeit usually following the passage of a storm. This example was spotted near Boca Raton, Florida, US.
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Mamma (Mammatus) following the passage of a summer thunderstorm which Nick said ushered in cooler air over Palma, Mallorca, Spain
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Mamma (Mammatus) clouds following a thunderstorm over Chalfont, Pennsylvania, US
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Mamma (Mammatus) over L'Escala, Spain
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Mamma (Mammatus) over Dryden, Texas, US
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Mamma (Mammatus) over Terry, Montana, US
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Mamma (Mammatus) over North Brunswick, New Jersey, US
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Mamma (Mammatus) at the tail end of a not particularly strong storm system, as Paolo reports, spotted over Sumirago, Varese, Italy
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Taken by John's friend, Brown Little, this photograph captures a classic example of Mamma (Mammatus) over Princeton, New Jersey, US
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Mamma (Mammatus) over Willow Grove, Pennsylvania, US
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