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Mammatus (Mamma) spotted during a storm over Stoke Newington, London, England
Asperitas and mammatus (mamma) ahead of a storm system, on one of Helen's best cloud spotting days, near Wells, Somerset, England
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Mammatus (Mamma) associated with a storm system over Ireland
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On the back side of a cumulonimbus, signs of mammatus (mamma) spotted over Wells, Somerset, England
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Mammatus (Mamma) spotted by Cliff's daughter, Elizabeth McQueen, over Market Harborough, Leicestershire, England
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Mammatus (Mamma) following a storm over Idaho State University, Pocatello, Idaho, US
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A vibrant view of a cumulonimbus during sunset on a summer evening over Momochihama, Fukuoka City, Japan
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Pyrocumulus as a result of the Mine Creek Fire, approximately 48 kilometers to the south of Lower Nicola, British Columbia, Canada
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Signs of mammatus (mamma) in this dissipating storm system, spotted in the "Hill Country Strong" area of Kerrville, Texas, US
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Mammatus (Mamma) at sunset over Hyderabad, India
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A storm system spotted from the High Ridge Trail at Rock Bridge State Park, near Columbia, Missouri, US
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Mammatus (Mamma) over Roermond, The Netherlands
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Mammatus (Mamma) dissipating over Somerset, England
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A picturesque sunset over Charlo, Montana, US
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A developing storm with signs of mammatus (mamma) over Luskentyre Beach, Isle of Harris, Scotland
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Mammatus (Mamma), often associated with thunderstorms, are indicative of sinking cold air that's carried into warmer air layers and create the characteristic bumpy, rounded appearance, as seen here over Hovell's Creek, Geelong, Victoria, Australia.
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