24 



VISIBIUITV -7,6 ^9 =V/MIXe:.. 



visiBiL-iTv - 5 *<S> -CROSS watcme:-. 



s/lSIBIL-tTY - 0,t,2,3 4-4- BUACK. 



Figure 12.— March weather diagram. For explanation of symbols, see Figure 11 



WEATHER DIAGPAM, 



MarcM,1930. 



