228 



THE WEATHER 



FIG. 158. Fair-weather cumulus clouds. ~ This type of cumulus is often 

 Note the level bases and rounded tops. (The bases are all at the same 

 height, though the distant bases appear lower because farther away.) These 

 clouds do not indicate rain. 



FIG. 159. A large cumulus. Note the level base and high tops. The 

 turret above each dome shows a much stronger upward current of air at 

 those points. The slightly fringed appearance of turret "A" shows the be- 

 ginning of rain formation in that part of the cloud. 



