226 



PRESSUKE, WINDS AND WEATHER. 



(a) (b) 



Fig. 7(1. Modified pressure distribution. = 225°. 



9 = 225°, figure 70. — There is now a still stronger pressure gradient for easterly winds 

 over the Barrier and now it extends right up to the Western Mountains. There has also 

 been time for the air from the east of the Barrier, moving all the time under increasing 

 gradient, to have commenced to pile up along the Western Mountains, to raise the pressure 

 there and to give rise to a violent flow of air across the north-west corner of the Barrier 

 near to Cape Evans. The blizzard has commenced ! 



The raising of the pressure along the Western Mountains has caused the isobars to turn 

 northwards in that region. This change is shown in figure 706 in which the pressure at 

 Cape Evans is about '09" above that shown in figure 70a. 



