SPACE-HEIGHT CROSS SECTION 
7T-NO0V-89 08:00 
WIND & SETASE 
  
Pressure(hpa) 
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47678 47600 &775à 47138 47065 58367 
  
  
58027 57083 57245 53614 56173-56046 56029 5260251886 No. 
Fig.2 Cross section 
(3) Stream line of atmosphere 
In order to draw the streamline by the method of net-points, 
we chose 3 near stations for inserting a data to net point. 
We developed a searching method which is named 
"enlargement from small area". Let us suppose that (x,y) is 
the longitude and the latitude of a grid point, (x1,y1) 
(x2,¥2), (x3,y3) is the longitude and the latitude of the near 
stations, their vector(wind velocity or wind direction) is 
V1,V2,V3, So the inserting formulas are as following: 
V=(rarzv4 "pras * r,rovs)/dt (5) 
Where 
dt=r1r2+r2r3 +r1r3 (6) 
r1=(x-x1)2+0-y1)2 (7) 
r2 7 (x-x2)?- (y-y2)? (8) 
13 =(x-x3)2+(y-y3)2 (9) 
Fig.3 is a streamline map. 
(4) Isogram of functional difference of thickness advection 
The functional difference of thickness advection indicates 
the geopotential change in a baroclinic field of atmosphere. 
This kind of isograms is a effective map for forecasting the 
rain gust in the rain season, the change of westerly wind in 
the east Asia, and so on. 
Suppose the pressure of higher layer is P4,the wind velocity 
is v1, the wind direction is aj. We also suppose the lower 
layers' pressure is P2, wind velocity is vo, wind direction is 
an, if the velocity of thermal wind from Pj to P is u, so 
we can calculate the functional value RTM by the following 
formulas: 
RTM -fhu/RIn(P2/P1) (10) 
Where 
f=2wsin0 
= /v1 +v2-2v1vacosb (11) 
h=2(4 /s(s-u)(s-v1)(s-v2)/u (12)