locations of the two groups of the berg crop can be assumed or esti- 

 mated using any available northern berg survey observations and 

 taking into account drift due to the current system and atmospheric 

 pressure patterns. 



Refer to Bulletin No. 50 of this series for a broader discussion on 

 this subject. 



Table 5 is statistical summary of the effect of mean surface winds. 

 This effect, correlated with the number of bergs drifting south of 

 latitude 48° N., is presented in Table 6. 



The trend indicated in these tables is for a slightly unfavorable 

 drift of bergs to the Grand Banks. Intensified local conditions that 

 can rapidly destroy or permanently entrap bergs are of course masked 

 by the averaging of the daily pressure observations used to compile 

 the mean monthly surface pressure charts. It now appears that 

 different weights must be assigned to the code to provide closer correla- 

 tion with actual observations. Eventually, when sufficient observa- 

 tions have been made, an empirical formula derived from curve fitting 

 may be inferred. 



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