JEROME NAMIAS 
ax 
tax 
acl 
7 hi ye Ke { f gp 
SS 
ANS ; 
‘ Xt 
| 
Fra. 6—Series of 15-day mean 700 
-mb charts illustrating lengthening wave length response to strengthening zonal index (upper three charts) and then 
increase in wave number (lower two charts) associated with sharply falling index 
