The use of anomalous pressure patterns to predict or explain 

 anomalous iceberg movement was discussed by Kelly and Morgan (1970) , 

 Using the same techniques of determining pressure gradients along 

 lines which are parallel or perpendicular to the normal iceberg 

 route, it is observed that the conditions during March were very 

 unfavorable for southward iceberg drift and favorable for eastward 

 drift. In this connection and noting the early appearance of 

 icebergs and growlers south of 49-OON in February, it should be 

 explained that the mean wind conditions during February were 

 favorable for southward drift and slightly favorable for eastward 

 movement. 



April 



The reconnaissance aircraft was unable to obtain a good 

 series of flights along the eastern and southern edges of the 

 Grand Banks during April due to frequent frontal passages and 

 associated rain and fog. On only three flights was the visibility 

 sufficient to obtain 75% coverage of the planned search area and 

 two of these were over the area north of the Grand Banks. Visual 

 effectiveness was approximately 20% on the remaining six flights. 

 A flight on 7 April located 44 icebergs north of the Grand Banks 

 with the greatest concentration lying from 49-30N to 50-OON 

 between 47-30W and 51-OOW. It is estimated that four icebergs 

 drifted south of 48-OON during the month. The southernmost 

 iceberg for the month was reported at 45-35N 48-45W on 15 April. 

 The easternmost iceberg was sighted on 18 April at 48-35N 44-25W. 

 It is estimated that one iceberg drifted east to 47-llN 41-32W on 

 4 April after being sighted on 21 March at 46-55N 45-25W. At 

 the end of the month the majority of the icebergs were located 

 north of 48-OON between 45-OOW and 49-OOW and the sea ice had 

 retreated farther north to 51-OON. Figure 8 is a chartlet showing 

 ice reports received and the results of aerial reconnaissance 

 during the period 7-12 April. 



11 



