Altostratus Sign Video
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Definition
A middle cloud composed of gray or bluish sheets or layers of uniform appearance. In the thinner regions, the sun or moon usually appears dimly visible.
Source: Essentials of Meteorology: An Invitation to the Atmosphere (fifth edition) by C. Donald Ahrens
Example
http://www.geography.hunter.cuny.edu/~tbw/wc.notes/5.cond.precip/clouds/altostratus.htm
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