Mammatus clouds 乳狀雲

 Mammatus clouds move over the Fredericksburg Agricultural Fair in Virginia, after a round of thunderstorms passed through the. Mammatus are most often associated with severe thunderstorms. (Peter Cihelka/The Free Lance-Star)
Pictures of the Week: 07.28 – 08.03 2013 | CLIK/HEAR | Multimedia, photography, video showcase of The Palm Beach Post http://clikhear.palmbeachpost.com/2013/potw/pictures-of-the-week-07-28-08-03-2013/

(AP)
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Mammatus cloud - Wikipedia, the free encyclopedia  http://en.wikipedia.org/wiki/Mammatus_cloud
乳狀雲 - 維基百科，自由的百科全書  http://zh.wikipedia.org/wiki/%E4%B9%B3%E7%8A%B6%E4%BA%91
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