Plate 26.
HAZY ALTO-CUMULUS.
(Alto-cumulus Nebulosus.)
Plate 26.
HAZY ALTO-CUMULUS.
(Alto-cumulus Nebulosus.)
Fixity of detail and slow movement characterize both the foregoing forms, and in that respect our next picture (Plate [27]) shows a cloud which is a great contrast. Its detached cloudlets are rather flatter and thinner, and though the cloud as a whole will often persist for hours, it is undergoing continual change, and is formed when the air is far from still. Cloudlets form and gather into stratiform patches, which soon break up again and disappear; and the process goes on here and there, sometimes accompanied by fairly rapid movement of the patches as a whole. This cloud may be described as alto-cumulus stratiformis.
