53-^ 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 105 



SEA-LEVEL PRESSURE AT 10° INTERSECTIONS 



Lat. 50° N. Long. 120° W. 



950 mb. + 



1929 



1930 

 1931 

 1932 

 1933 

 1934 



1935 

 1936 

 1937 

 1988 

 1939 



Lat. 50° N. Long. 110° W. 

 950 mb. + 



74.5 

 65.1 

 67.4 

 60.8 

 67.9 



73.0 

 72.1 

 72.5 

 69.3 

 64.7 



70.5 61.0 63.2 66.9 61.1 62.4 C4.9 66.0 



62.9 

 67.9 

 65.5 

 65.1 

 72.5 



70.6 

 73. 7 

 65.9 

 75.4 

 71.1 



66.1 

 73.9 

 69.3 

 69.3 

 70.4 



62.5 

 61.2 

 73.3 

 60.4 

 G9.6 



66.5 

 66.8 

 67.4 

 65.5 

 65.8 



G8.5 

 G9.9 

 64.6 

 66.6 

 66.8 



63.5 

 63.4 

 05.8 

 62.0 

 62.8 



09.0 

 64.2 

 64.1 

 63.5 

 61.6 



58.7 

 60.8 

 60.5 

 60.8 

 61.4 



60.5 

 63. 

 62. 5 

 63.7 

 61.7 



62.9 

 60.6 

 61.9 

 63.5 

 63.5 



65.3 

 64.7 

 62.7 

 64.9 

 64.8 



61.9 

 61.0 

 65.9 

 58.3 

 64.2 



62.1 62.6 65.2 



G1.9 65. 1 04. 



63.3 62. 66. G 



63.3 62.1 67.8 



68.1 



66.0 

 63.8 

 65.7 

 66.8 

 65.0 



66.5 

 66.2 

 66.1 

 66.1 



66.9 69.6 



66.8 

 65.2 

 67.9 

 67.4 

 66.6 



66.9 

 66.1 

 65.3 

 69. 8 

 70.1 



70.4 71.0 



70.6 60.7 



67.7 G'J.7 



65.8 05. 8 



66.1 



65.2 

 64.9 

 65.4 

 64.5 

 66.3 



66.8 

 66.6 

 66.5 

 65.8 



Mean 69.1 69.2 67.0 66.5 64.2 61.3 62.5 63.9 64.1 66.0 67.5 68.1 



65.8 



