I — I 



1QRMAL (1946-1969) MAR 



MAR 



/1974 ^ 



Figure 26c— March Normal and 1974 Monthly Average Surface Pressure in mbs Relative to 



1000 mbs. 



^NORMAL (1946-1969) Af 



Figure 26d.— April Normal and 1974 Monthly Average Surface Pressure in mbs Relative to 



1000 mbs. . 



57 



