distribution of pack ice and icebergs for this month is illustrated 

 graphically in figure 3. In March, 18 ice observation flights were 

 made. 



APRIL 



The bergs reported in March in the vicinity of 45°20' N., on the 

 eastern edge of the Grand Banks continued their southward travel in 

 April and began to arrive at the Tail of the Grand Banks by the middle 

 of the month. Some bergs were stranding along the 50-fathom curve 

 as the}" travelled southward. On the 28th, the sighting of a berg and 

 two growlers in the vicinity of 43°10' N., 47°57' W., was the first 

 sign aside from the berg reported 24 February, that any ice had 

 entered the large counterclockwise eddy between the Labrador Cur- 

 rent and the Atlantic Current. In April, no bergs were reported to 

 the west of 50°00' W., in latitude 43°00' N., and those reported east 

 of 50°00' W., in all likelihood disintegrated in the aforementioned 

 eddy. 



The danger of bergs east of Flemish Cap which had been fore- 

 shadowed in ]\Iarch materialized in the latter half of April. The first 

 indication that any bergs were to the east of Flemish Cap was the 

 sighting of a berg in 46°46' N., 44°16' W., b}^ ice patrol aircraft on 

 the 17th. Between the 17tli and the 22d there were numerous reports 

 of bergs in this area. This eastward drift continued through the 

 remainder of April and on into May. It was restricted in April to 

 an eastward drift of bergs between the latitudes 46°30' N., and 48°00' 

 N. In March there had been a drift of bergs south and east of Flemish 

 Cap but this did not occur in April. At the end of the month the 

 southernmost ice was the berg and two growlers reported on 28 April 

 in the vicinity of 43°10' N., 47°57' W., and the easternmost ice was 

 several growlers reported on the 30th in 47°03' N., 44° 15' W. 



Late in March pack ice had covered the northern half of the Grand 

 Banks but by 3 April the only drift ice reported south of 46°30' N., 

 was a tongue of ice extending from approximately 46°30' N., 47°00'' 

 W., to 44°40' N., 48°40' W. This tongue disappeared within 10 days 

 and on 13 April the only drift ice south of 47°10' N., was a small patch 

 reported in 46°10' N., 46°50' W. The movement of drift ice tended to 

 follow the contour of the 100-fathom curve and as April progressed 

 the southern limits of drift ice retreated northward along the 100- 

 fathom curve reaching the position 47°35' N., 48°30' W., on the 21st 

 and virtually disappearing from the Grand Banks area south of 

 48°00' N., by the end of the month. For the rest of the season drift 

 ice was not considered a danger to trans-Atlantic shipping. Drift ice 

 in Cabot Strait gradually receded from its maximum seaward extension 

 on 31 March at 56°50' W., to 57°20' W., on 5 Aprd to 58°00' W., on 

 15 April to 58°50' W., on 22 April and for the last week of April it 

 was west of 59°00' W. The southernmost latitude for drift ice in this 



8 



