33. Altocumulus Formed by a Spreading Out of the Tops of Cumulus, 



Me. 

 In the upper part of this picture there are altocumulus clouds which 

 are evidently derived from the tops of cumulus clouds in the neighbor- 

 hood. They are fairly thick in places but are thinning out elsewhere. 

 Wlien there is doubt whether these clouds are altocumulus or strato- 

 cumulus, they should be coded AI^ so that, as in this case, the cumulus 

 clouds also present may be reported, using code L2 or L^ as may be 

 appropriate. (Anonymous.) 



34. Altocumulus Associated With Altostratus, My. 



There are two la^^ers of altocumulus in this picture. At the higher 

 level there are more or less globular cloudlets, especially at the left. 

 There is a patch of clear sky near the center of the picture. Dark 

 fibrous veils of altostratus can be seen at the upper right, while the 

 clouds in the lower part of the photograph are altocumulus at a lower 

 level with some of the characteristics of altostratus. (Photo at 

 Cheyenne, Wyo., by H. T. Floreen.) 



70 



