Altostratus duplicatus (As du) - Maze 1889, De Quervain 1908, CEN 1926
(Section 2.3.5.3.3)Altostratus composed of two or more superposed layers, at slightly different levels, sometimes partly merged. This variety is rarely seen in Altostratus.
Altostratus composed of two or more superposed layers, at slightly different levels, sometimes partly merged. This variety is rarely seen in Altostratus.