31. Altocumulus in Patches, Showing Signs of Evaporation and Being 

 More or Less Lenticular in Shape, 3/4. 



This is another type in which small cloudlets are grouped in patches 

 more or less lenticular in shape (roughly like the cross-section of a 

 lens). The cloud patches are sometmies at different levels and 

 usually show signs of evaporation. In this code classification, the 

 total amount of clouds is not large and they are usually more delicate 

 than clouds coded M5. (Photo at Cheyenne, Wyo., by H. T. Floreen.) 



32. Altocumulus Arranged in More or Less Parallel Bands, Advancing 

 Over the Sky, M5. 



In this picture the altocumulus clouds are arranged in more or less 

 parallel bands. The layer is of irregular thickness with signs of 

 evaporation in places. To be coded ]\l5 the net result must be an 

 increase in the amount of cloud. Although there are signs of evapora- 

 tion, the proportions of the sheet and its regular structure differentiate 

 it from clouds coded M^. (Photo taken near Crozet, Va., by 

 A. C Lapsley.) 



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