9. Stratocumulus Formed by the Flattening of Cumulus Clouds, L4. 



The tops of the cumulus clouds are subsiding and flattening and the 

 bases have spread out at the end of the period of diurnal convection. 

 Parts of cumulus bulges are still visible. Stratocumulus is seen in 

 the upper part of the picture, from degeneration of another mass of 

 cumulus. There are crepuscular rays. This type is called stratocumulus 

 respemlis. (Anonymous. ) 



10. Stratocumulus Forming From Cumulus, L4. 



In tliis case the tops of the cumulus clouds are spreading out at the 

 end of the diurnal period to form opaque layers of stratocumulus. 

 The final phase in this process is the melting away of the bases of 

 cumulus or cumulonimbus and thinning of the stratocumulus. Tliis 

 type is called stratocumulus cumulogenitus. The stratocumulus formed 

 in this way may show a mammatus structure. (Photo taken on M. S. 

 Northern Sun by B. A. Thompson.) 



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