WHOLE VOL. 



LAT. 70" 



N. 



509 



SEA-LEVEL PRESSURE AT 10" INTERSECTIONS 



Lat. 70° N. Long. 90° W. 



950 mb. + 



Mean 61.7 63.6 67.9 



3.6 69.1 64.2 60.5 58.9 62.3 61.4 61.6 62.1 63.6 



Lat. 70° N. Long. 80' 

 950 mb. + 



W. 



Mean 59.2 61.1 65.4 68.2 67.5 63.1 60.1 58.1 61.4 59.6 58.3 59.7 61.8 



Lat. 70° N. Long. 70° W. 

 950 mb. + 



Mean 66.3 58.1 62.9 66.3 65.6 61.8 59.5 57.7 69.9 57.4 54.3 56.9 



59.3 



