11 



(A) 



(B) 



(C) 



Figure 1. Initial conditions, 0300 GMT 10 February 1957- (A) 500 mb 

 geopotential height (solid curves, labeled in hundreds of feet) and 

 temperature (dashed curves, labeled in °C); (b) 1000 mb geopotential height 

 (solid curves labeled in hundreds of feet) and 1000-500 mb geopotential 

 thickness (dashed curves labeled in hundreds of feet), (c) mean specific 

 humidity (parts per hundred thousand). See text page 10. 



