Number of ice reports received _ _ _ 80 



Number of vessels furnishing ice reports 64 



Number of water temperature reports received 596 



Number of vessels furnishing water temperature reports 104 



Number of obstruction reports received 17 



Number of vessels furnished special information 22 



During the period of this cruise aerial ice observation flights 

 supplemented the surface patrol vessel activity as follows : On 30 

 May one flight covered the area from 49° N., to the edge of the 

 field ice at about 52°40' N, between 50° W., and 54° W. Three 

 flights on 3 June and two flights on 4 June gave very nearly com- 

 plete coverage of the area from 41°30' N., to 47°20' N., west of a 

 hne from 41°30' N., 47°30' N., 47°00' W., to 47°20' N., 42°00' W., 

 and east of 51°00' W. In parts of this area coverage depended on 

 radar and some bergs and growlers may have been missed. 



Seventh Cruise, "Modoc," 10 June fo 77 June, 7946 



The Modoc departed Argentia, Newfoundland, at 1230 G. c. t. 

 on 9 June 1946, for ice patrol. The Tampa was met and relieved as 

 surface patrol vessel at 45°00' N., 50°55' W., at 1000 G. c. t. on 10 

 June 1946. 



A general summary of weather encountered during this cruise 

 follows. One low-pressure area and two low-pressure troughs af- 

 fected weather in the area. The first disturbance contained a warm 

 occluded front and was accompanied by an extensive area of heavy 

 fog. The two low-pressure troughs occurring on 12 and 13 June 

 were followed by areas of precipitation but no definite frontal 

 structure. Winds were mostly from the southsouthwest to south- 

 west except the last 2 days of the cruise when the wind backed 

 to north and northeast with decreasing velocity. The wind force 

 averaged 3 to 5, but picked up to moderate gale proportions on the 

 13th and 14th, with accompanying moderate to rough seas. Heavy 

 fog was continuous on the 9th and 10th and occurred again for 

 protracted periods on the 13th, 14th, and 15th. Precipitation fell 

 on 11, 13, 14, 15 and 16 June, with thundershowers occurring on 

 the 11th at 0600 G. c. t. The sky was clear on the afternoon and 

 evening of the 11th. During the remainder of the period it was either 

 cloudy or obscured by heavy fog. The average daily maximum air 

 temperature was 52 °F. and the average daily minimum 46 °F. The 

 highest and lowest recorded temperatures were respectively 55° 

 and 43° F. 



The Modoc was relieved by the Tampa at 45°04' N., 50° 17' 

 W., at 1215 G. c. t. on 17 June 1946. The Modoc then set course for 

 Argentia, Newfoundland, arriving there on 18 June 1946. 



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