430 DISCUSSION 
OBSERVED 
MEAN 700-MILLIBAR CONTOURS __ , 
AUGUST 1955 ype 
U. S. DEPARTMENT OF COMMERCE 
WEATHER BUREAU 
HEAVY ZY 
OBSERVED PRECIPITATION 4 \: 
(APPROXIMATE) \| moperate [__] 
AUGUST 1955 we LIGHT 
Fig. 3—Mean 700-mb contours (above) and precipitation pattern (below) for August 1955 
