54 



towards the patrol area. A ridge of high pressure that extended at 

 times unbroken from Greenland to Bermuda was noted during the 

 last half of the month. 



The barometric gradients shallowed out markedly as compared 

 with the preceding month. They became strongly suggestive of sum- 

 mer weather conditions with shallow Lows over the land and Highs 

 over the ocean. Only five noticeable depressions are visible in the 

 barometric curve. Four of these are of trivial depth. The most 

 marked Low occurred early in the month, and the passing of its 

 center was followed by nearly 24 hours of northwesterly gales. A 

 few more hours of gales were experienced on the 8th, 19th, and 20th, 

 and no others were encountered during May. 



JUNE 



Maximum air temperature, 69° F. 



Minimum air temperature, 39° F. 



Average air temperature, 49.2° F. 



Visibility was less than 4 miles 47 per cent of time. 



Visibility was less than 2 miles 40 per cent of time. 



The ice patrol remained in effect during the first 22 days of June 

 only. During this time poor visibility was experienced slightly in 

 excess of normal. Winds of gale force were experienced only on the 

 15th. They were from the northwest as the majority of the patrol 

 vessels' gales seem to be. 



Summer-time conditions of groups of weak Lows over the continent 

 and a High over the ocean from Bermuda to the northeastward were 

 observed. The persistence of a low pressure area to the northeast 

 of Newfoundland, as in April and early May, was noted. 



There were about eight dips in the barometric curve but all were 

 shallow where they passed the patrol vessel and were moving slowly. 



GENERAL REMARKS 



As in previous seasons a weather map was constructed twice daily 

 on board ship for use in forecasting and in planning the operations 

 of the patrol to the best advantage. The maps were obtained in 

 large part from information in the general synoptic reports broadcast 

 from NAA, Arlington, Va., at 0300 and 1,500 G. M. C. T., well supple- 

 mented by means of ship reports from the ice patrol area. A special 

 daily forecast for the patrol vessel was received from the United 

 States Weather Bureau. 



The weather information on hand was always available to passing 

 vessels on request. It was usually included, in part at least, in the 

 routine ice broadcasts on account of the marked interest displayed 

 by shipping early in the season in the weather being experienced by 

 the patrol. 



