ILLUSTRATIONS 
131 
Nep ZL 
OP 
Nee «a. Ew 
7 
Nee a) WA 
Dec 2, 1958 
Fic. 6. Cross-section for 4:00 a.m., E. S. T., Dec. 2, 1938. 
A Rossby Diagram 
A ROSSBY DIAGRAM OF AN AIRPLANE SOUNDING AT NANKING, CHINA, AUG. 
23,1937. There is a shallow layer of TM air at the surface with a sharp front 
at 706 meters, above which Equatorial marine air exists to the top of the 
sounding. This sounding was made just after a typhoon passed inland over 
Nanking, the warmer Em being imported aloft by the circulation of the storm. 
(From a paper by Tu, Bull. Amer. Met. Soc., March, 1939.) 
Synoptic Charts Showing Winter Cyclones 
(Figs. 1, 2, 6-13 from: Dorsey, Bull. Amer. Met. Soc., Oct. 1938.) 
OCCLUDED 
Feb. 25,1933-8am 
Fic. 1. Deep cold air over New England 
was augmented by fresh Pc the next day. 
The warm and occluded fronts ‘in the low 
over Michigan are producing snow (stippled 
area) over a wide region and caused heavy 
snow in New England later the same day 
as it moved eastward. 
09 10 11 05 
‘HIGH 
(110/09 ©8 OF ‘06 
qo\ 
[08 
07. 
06 
March 2, 1933-8an 
Fic. 2. The low off the east coast was 
formed by amalgamation of two weaker lows 
the day before. This storm caused N W gales 
and heavy snow on the seaboard. In this and 
Figs 2-4 the effect of fresh Pc outbreaks in 
sweeping up old occlusions ahead of them is 
evident. 
