Luiz Claudio Marigo / Clouds of the type Mammatus above Rio de Janeiro city, these clouds usually indicate the imminent arrival of a cold front cold, Brazil, June 2011
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Bryan and Cherry Alexander / Mammatus cloud formation at sunset over Gardemoen Airport, Oslo, Norway, June 2008.
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Floris van Breugel / A clearing storm and mammatus clouds at sunset, over sand dunes, Death Valley National Park. California, USA. February 2009.
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Inaki Relanzon / Mammatus or mammatocumulus cloud formations, Catalonia, Spain, March 2010
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Inaki Relanzon / Mammatus or mammatocumulus cloud formations, Catalonia, Spain, March 2010
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Jim Brandenburg / Landscape of rippling sand, Namib Desert, Namibia
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Jim Brandenburg / Prairie under threatening thunder clouds, South Dakota
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Doug Gimesy / Mammatus clouds offshore whilst wind blows sand into the ocean. Apollo Bay, Victoria, Australia, June 2015
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Doug Gimesy / Mammatus clouds offshore. Apollo Bay, Victoria, Australia, June 2015