Mammatus

Small cloud bubble-shaped supplementary feature that appears in cumulonimbus, stratocumulus, altocumulus, cirrocumulus, and cirrus.

Cumulonimbus mamma

Cumulonimbus mammatus Wolken über Birkholz (Bernau bei Berlin) vom 9. März 2022

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  Cumulonimbus with mammatus
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  Cumulonimbus mit mammatus Wolkenfront
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  Dark Cb mammatus
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  Cumulonimbus with mammatus formed after Hurricane Catarina in Santa Catarina, Brazil, 2004
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  Another view of the post-Catarina mammatus formation
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  Globular mamatus clouds with radar in foreground.
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  Mammatus clouds in Tulsa, Oklahoma, 1973
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  Mammatus clouds.
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  Mammatus clouds.
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  Mammatus clouds.
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  Mammatus in the evening
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  Mammatus clouds seen near the Twin Cities, Minnesota USA
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  Mammatus clouds in San Francisco
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Altocumulus mamma

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  Altocumulus mamma
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  Altocumulus mamma

Stratocumulus mamma

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Cirrocumulus mamma

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Cirrus mamma

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  Cirrus mamma
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  Same picture, different angle.
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  Cirrus mamma
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  Cirrus spissatus mamma