currents or absence of them as shown by the drift of the berg, in 

 order that some advance information might be obtained as to the 

 general menace of other bergs to the north, and their probable move- 

 ments. 



The Modoc trailed the berg until relieved of the patrol by the 

 Tampa at 8.35 a. m., June 25 in latitude 42° 32' N., longitude 49° 33' 

 W. Practically the entire cruise was devoted to guarding the south- 

 ern berg and the critical area in the vicinity of the Tail of the Banks; 

 no time being afforded for exploring the fields to the extreme north. 

 Two passenger liners sighted were reported for violation of the 

 track agreement and that fact communicated by dispatch to coast 

 guard headquarters. 



RESUME 



Up to and including June 23, 49 berg reports were received from 

 ships and 61 from Cape Race radio station; 7 reports of obstructions 

 to navigation were received and broadcast. In addition to the peri- 

 odic ice broadcast, 11 special broadcasts were transmitted; 35 

 steamers were given individual ice warnings for safe course to be 

 followed in the vicinity of bergs. Eighteen weather reports were 

 transmitted to passing ships. Nine vessels were observed by day 

 passing the berg guarded, 2 of them passenger liners, and 5 vessels 

 "by night to whom the presence of the berg was communicated by 

 searchlight beam. 



WEATHER 



(See Charts Nos. 13, 14 and 15) 



The weather during this cruise was favorable in the main. One 

 southerly gale of force eight was experienced on the 17th and strong 

 breezes to a moderate gale from the same quarter on the 19th. 

 The fog experienced was 26.8 per cent. 



WATER TEMPERATURES 



(See Charts Nos. 13 and 14) 



An analysis of the water temperatures plotted during the period 

 June 1-15, indicated that the cold wall had changed its position very 

 little west of the Tail of the Banks, but had moved up considerably 

 on the eastern side. The 50° curve worked up close to the eastern 

 and western sides of the Tail of the Banks, leaving a narrow tongue of 

 water at temperatures 42° to 48° extending south-southeast toward 

 the 60° curve. A long narrow tongue of water carrying temperatures 

 from 38°-40° extended the full length of the eastern edge of the Grand 

 Banks. The chart begun for the period June 16-30 showed that this 

 cold tongue had been pinched off at about latitude 44° 00' N. 

 72783— 26t 3 



