Unusual mammatus clouds form in the sky over Luanping county of Chengde in North China’s Hebei province on April 27, 2015. The clouds are often a sign of approaching wild weather. (Photo: China News Service/Zhou Wanping)
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Unusual mammatus clouds form in the sky over Luanping county of Chengde in North China’s Hebei province on April 27, 2015. The clouds are often a sign of approaching wild weather. (Photo: China News Service/Zhou Wanping)