WHOLE VOL. 



LAT. 50 N. 



533 



SEA-LEVEL PRESSURE AT 10° INTERSECTIONS 



Lat. 50° N. Long. 90° W. 



950 mb. + 



Mean 67.0 67.1 65.2 65.7 65.4 62.6 62.8 64.3 64.8 65.0 65.2 67.3 



65.2 



