FISHERY BULLETIN: VOL. 69, NO. 2 



Figure 16. — Sea-surface temperature anomaly for No- 

 vember 1957. Hatched areas colder than normal. Heavy 

 lines represent the 1° C anomaly contours which define 

 warm (-|-) or cold ( — ) cells. 



IZO* ISO* 140* 00* 160* ITO* «0* ITO* HCT ISO* 140* 130* 00* HO* ICO* 90* 80* 



Figure 18. — Sea-surface temperature anomaly for Au- 

 gust 1958. Hatched areas colder than normal. Heavy 

 lines represent the 1° C anomaly contours which define 

 warm ( + ) or ( — ) cells. 



Figure 17. — Sea-surface temperature anomaly for March 

 1958. Hatched areas colder than noi-mal. Heavy lines 

 represent the 1° C anomaly contours which define warm 

 (-I-) or cold ( — ) cells. 



Figure 19. — Sea-surface temperature anomaly for Jan- 

 uary 1959. Hatched areas colder than normal. Heavy 

 lines represent the 1° C anomaly contours which define 

 warm ( -|- ) or cold ( — ) cells. 



(Figure 21). The intensity and size of the wai-m 

 cells diminished by February 1960 (Figure 22) 

 and anomalies along the North American coast 

 were generally weak, although mostly positive, 

 through mid-1961. 



The cold cell present in the west central Pa- 

 cific in November 19*59 had, by February 1960, 

 pushed eastward to a new location, at lat 32° N 

 to 48° N, long 155° E to 155° W (Figure 22). 

 Thereafter it remained essentially within this 

 region until the spring of 1961. However, the 

 size and shape of the cold cell fluctuated con- 

 siderably during this extended interval, as in- 

 dicated in the charts for June 1960, November 



1960, and February 1961 (Figures 23-25). This 

 cold cell began to shift eastward in May 1961 and, 

 by June, had reached a position at lat 32° N 

 to 45° N, long 137° W to 160° W (Figure 26) 

 where it remained through August. A new 

 warm cell had appeared in the west sector at 

 lat 30° N to 40° N, long 170° W to 165° E in 

 June, but cannot easily be related to an impend- 

 ing transition in the anomaly field. It appeared 

 to shift we.stward in July and August then 

 vanished in September 1961, when the over- 

 all pattern collapsed. 



The third and final phase in the progression 

 of events began rather abruptly in October 1961 



350 



