PROBLEMS AND METHODS OF RAINFALL INVESTIGATION 
Re, B 
ENS 
S=No rain, owing to 
subsidence 
Cb= Rain from detached 
Cunb (true showers) 
Fr=Rain from frontal 
cloud system 
Or=Rain from orographic 
cloud system 
Vc=Rain from cloud 
system connected with 
rapid vorticity change 
in homogeneous 
current 
<7 1000m isohypse 
Fig. 18—Rainfall in Sweden, July 26-27, 1950, 07z-07z 
