LARGE-SCALE SYNOPTIC PROCESSES UNDERLYING PRECIPITATION 43 
eS 
VERT. VELOCITY (cm/sec) 
Fic. 11—Vertical velocity (cm/sec) for 600-mb level for 12h 00m, GMT, 
January 21, 1959 
“VERT. VELOCITY (cm/sec) 
Fic. 12—Vertical velocity (cm/sec) for 600-mb level for 12h 00m, GMT, 
January 22, 1959 
(2) sleet just behind the cyclone center where and (5) fog and drizzle in the northward-moving 
rain falling out of the tropical air falls through tropical air east of the Appalachians. 
a sub-freezing layer; (3) continuous rain ahead 
of the warm front; (4) showers and thunder- 
showers in a band extending from the cyclone Bowen, E. G., The relation between rainfall and 
center southward (developing into a squall line) ; meteor showers, J. Met., 13, 142-151, 1956. 
REFERENCES 
