17. Low Clouds of Bad Weather, Lg. 



The upper part of this picture shows a hiyer of nimbostratus clouds 

 traihng off to dense altocumuhis in tlie distance. Below in the fore- 

 ground be^yond the trees is a layer of dark fractocumulus (Lq) of bad 

 weather with a bnnd of brighter sky between the two layers. This 

 photograph, which was taken at Blue Hill Observatory with a minor 

 front approaching, should be compared witlv plate 27. (Photo by 

 C. F. Brooks.) 



18. Cumulus of Fine Weather and Stratocumulus, L7. 



In this picture a layer of stratocumulus in waves is shown with 

 openings at the right where the sky is visible. Below this layer there 

 were cumulus clouds of fine weather. A part of a cumulus cloud is 

 shown in the right lower margin of the picture; it looks dark against 

 the stratocumulus. In this code type the stratocumulus is formed 

 independently and not derived from cumulus. (Photo at Cheyemie, 

 Wyo., by H.T. Floreen.) 



54 



