Mammatus meaning `mammary cloud`, is a cellular pattern of pouches hanging underneath the base of a cloud, typically cumulonimbus rainclouds, although they may be attached to other classes of parent clouds. The name mammatus is derived from the Latin mamma meaning `udder` or `breast`. According to the WMO International Cloud Atlas, mamma is a cloud supplementary feature rather than a genus, species or variety of cloud. They are formed by cold air sinking down to form the pockets contrary to the puffs of clouds rising through the convection of warm air. These formations were first described in 1894 by William Clement Ley.
圖片編號:
150874293
拍攝者:
Gbanns
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標準授權 | 319 x 480 px | JPG | 13 點 |
標準授權 | 532 x 800 px | JPG | 15 點 |
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進階授權 | 2824 x 4248 px | JPG | 88 點 |
進階授權 | 2824 x 4248 px | JPG | 88 點 |