It. can be seen from Table 2 that the reconnaissance flights must be 

 made at that opportune time when visibility is adequate for an effective 

 search. Figure 1 depicts in percent the times the visibility at Argentia 

 (dotted line) and over the cold Labrador Current on the eastern slope 

 of the Grand Banks (solid line) was less than 5 miles. April, May, and 

 .Tune, the months when most bergs endanger the steamer tracks, also 

 unfortunately are those months with the highest percentage of re- 

 stricted visibility. During these months the principal storm tracks 

 are south of Newfoundland bringing warm moist air in contact with 

 the colder sea surface temperatures on the Grand Banks, particularly 

 over the very cold waters of the Labrador Current. The minor storm 

 tracks for these months pass over northern Newfoundland and, while 

 bringing in relatively drier and colder air than the major storm tracks, 

 the air is often warm and moist enough to cause fog over the Labrador 

 Current. 



FEB MAR APR MAY JUN 

 ARGENTIA EASTERN GRAND BANKS 



JUL 



AUG 



FIG- 1 -RESTRICTED VISIBILITY -1965-% OF TIME 

 Figure 1. — Restricted visibility — 1965 — percentage occurrence. 



COMMUNICATIONS 



The ice reports collected from ships, aircraft, and ice observation 

 agencies were plotted and analyzed, and during periods when aerial 



