air temperature was 59 °F. and the average daily minimum tem- 

 perature was 53 °F. The highest recorded temperature was 69° 

 and the lowest 47°F. The highest barometer, 1,030 millibars, 

 occurred on 6 July and the lowest was 1,013 millibars on the- 5th. 



At 1910 G. c. t. on 15 July, 1946, the Tampa relieved the Modoc 

 as surface patrol vessel at 44° 02' N., 43° 57' W. The Modoc then set 

 course for Argentia, Newfoundland, arriving there on 17 July 1946. 



The following is a summary of the water temperature, ice, and 

 obstruction reports received during this cruise: 



Number of ice reports received 29 



Number of vessels furnishing ice reports 27 



Number of water temperature reports received . 801 



Number of vessels furnishing water temperature reports 200 



Number of obstruction reports received 18 



Number of vessels furnished special information 35 



During the period of this cruise the scouting of the surface patrol 

 vessel was supplemented by aerial ice observation flights as follows : 

 On 6 July two flights covered the area from 45°40' N., 50° 00' W., 

 to 42°20' N., 50°50' W., to 42°20' N., 47°30' W., to 44°00' N., 

 45°00' W., to 45°40' N., 44°20' W., except for a narrow strip just 

 inside the eastern edge of the area and a triangular area about 

 50 miles on a side near the northern edge and centered at about 

 46°30' W. On 11 July these areas were expected to have good 

 weather although thick weather was predicted for the adjacent area 

 eastward. A flight was attempted with a PBY-5A but the preva- 

 lence of fog and a generator failure caused the attempt to be aban- 

 doned. On 15 July two flights covered the areas missed on 6 July 

 and extended the coverage eastward to a line from 42°40' N., 

 46°10' W., to 44°00' N., 44°30' W. 



Tenth Cruise, "Tampa," 15 July to 27 July, 1946 



The Tampa departed Argentia, Newfoundland, at 1238 G. c. t. 

 on 13 July 1946, for ice patrol. At 1910 G. c.t. on 15 July 1946, 

 the Modoc was met and relieved as surface patrol vessel at 44°02' 

 N., 43°57' W. 



The weather encountered on this cruise is summarized as follows. 

 Only one cyclonic disturbance with two frontal passages occurred. 

 This disturbance passed the area on 20 July and was accompanied 

 by force 8 winds and heavy seas. The lowest recorded pressure 

 was 1,012 millibars. The warm front passed at 1730 G. c. t. on 

 the 20th and the cold front passed at 1600 G. c. t. on the 21st. 

 The winds were generally light and from the south to southwest. 

 The temperature varied from a maximum of 74°F. on 16 July to a 

 minimum of 47 °F. on the 15th. Fog was present for a total of 107 

 hours and rain fell during a total of 29% hours. 



The continuous surface vessel patrol was discontinued for the 

 season at 1500 G. c. t. on 27 July, 1946, at 45°06' N., 49°29' W. 



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