588 MECHANICS OF PRESSURE SYSTEMS 
WS 
NOV. 7, 1948 ae Gj NOV. 8, 1948 
300 MB 1500Z VE SO . 300 MB 0300 Z 
= = - = 
140° Bo 
NOV. 8, 1948 : : NOV. 9,1948 
300 MB 1500Z : : ; 300 MB 0300Z 
o = a = u 130" 
140" 
NOV. 9, 1948 : 5 NOV. 10,1948 
300 MB 1500 Z 2 y 300 MB 0300Z 
140" 130° 7 ¥ 9) 7 140° BO 120" 
: : - : ; : ab, 
Fra. 9.—Twelve-hourly sequence of 300-mb maps during November 7-10, 1948 (7; = radius of isobaric curvature, 7min = — 57 & 
= 2v,/9.). Asterisk marks position of apex of frontal wave on sea-level map. Half barb 5 m sec™!, full barb 10 m sec™4, triangular 
barb 50 m sec. 
