194 



SYNOPTIC RADIO METEOROLOGY 



A=N+Nol[-exp(chl] 

 WHERE No=3l3 



c =-.143859 

 h=ht. in km 



170 190 210 230 250 270 290 310 330 350 370 390 410 430 



\6 



N=(n-l)IO' 



Figure 5.17. Potential refractivity chart. 



Table 5.1. Differences between No and A at various elevations 

 Value of N at z=0 



