all, if not most, of these bergs were close ashore with many trapped 

 or grounded temporarily. If these conclusions were correct, any 

 threat to the major shipping lanes until late June was restricted to the 

 former three groups mentioned. 



Although winds averaged northerly over the northern and western 

 Grand Banks during early May, winds were west-northwesterly near 

 46° N., 47°30' W. driving all 20 bergs to the southeast and out of the 

 Labrador Current into warmer waters. The major threat to Track 

 B quickly dissipated as these bergs deteriorated within 12 days with 

 a couple reaching 45° 30' W. in the Gulf Current before perishing. 



60 99 58 57° 56 55 54° 53° 52 5t 50 



Figure 21. — Ice conditions Grand Banlis on 1 May 1964. 



None of the 20 bergs were able to drift south of 44° N. Attention 

 was now centered on about 10 small and medium bergs just west of 

 the Labrador Current on the eastern slope of the Grand Banks. Four 

 of these bergs had been driven south from near 48°30' N., 49°30'' W. 

 to near 44°30' N., 49°30' W. and were a minor threat to Tracks C and 

 B. As a result of west-northwest winds in early May, these bergs 

 were redriven into the Current. However, these bergs, which were 

 badly weathered and small in size, lasted only a few days, a couple 

 of them drifting south to near 43° N. before deteriorating. The 

 southernmost penetration of glacial ice for 1964 took place at this time 

 in the form of two growlers reported at 42°58' N., 48° W. Except 

 for two additional small bergs, no other ice was able to drift south of 

 44° N. until the end of May. These two bergs were all that remained 

 of the group of 12 just west of the Current in early May. Both 

 drifted south of 44° N. in mid-May, but neither managed to last long 

 enough to drift south of 43° N. 



17 



