"VIS. 7, 8 4 9 

 VIS. 5 4- <> 

 -VIS. 0,I,2,S 44 



APRIL VCATWER DIAGRAM 



V/HlTE 



CROSS HATCHED 



ei.ACK 



1929 



Figure 2.— Inner figures show day of the month; the next band out contains the record of the atmos- 

 pheric pressure; the next outer one indicates the degree of visibility (black areas for visibility of less 

 than two sea miles and cross-hatched areas for visibilities of between two and four miles) ; the outer 

 margin shows the average direction and force of wind per 12-hour periods, midnight to noon and 

 noon to midnight. Wind directions are toward the small circle in each case. Arrow indicates true 

 ■north 



