Bay 



^^ ^ 



At 



Hudson Bay! 



Fi3ure 3-1 . — Common track for low-pressure centers. 



low pressure area into the Barents and Kara Seas. Separating these 

 two pressure areas is the Atlantic Arctic Front along which the 

 cyclonic disturbances in these regions are most likely to develop. 



During the winter months, the center of the Arctic Anticyclone 

 lies in the vicinity of 80° N,, 165° E. The Icelandic low pressure 

 area extends northeastward from Iceland to beyond northern 

 Novaya Zemlya. Its central axis is marked by the mean position 

 of the Atlantic Arctic Front, which extends intermittently along 

 the northern Siberian coast to 170° W. longitude. There is a rather 

 uniform and quiet situation over the polar basin. At this season, 

 an almost continuous succession of cyclones is to be noted along the 

 Arctic Front, between Bear Island and Novaya Zemlya. East of 

 Novaya Zemlya, the disturbances decrease in intensity and dissi- 

 pate so that few storms penetrate along the east Siberian coast. 

 Surface winds are prevalent from the westerly direction along the 

 Siberian coast ; easterly over the central arctic regions and most of 

 Greenland ; and north to northwest over the Canadian archipelago. 



During the spring months, the winter pattern of mean pressure 

 is continued with little change. The Arctic Anticyclone shifts 

 slightly eastward to the 180th meridian and the central pressure 



92 



