32 MANUAL OF MARINE METEOROLOGICAL OBSERVATIONS 



4103. When the visibility is not the same in all directions, the highest 

 value common to one-half or more of the horizon circle should be coded on 

 Form 615-5. For example, if fog limits the visibility in the north and east 

 quadrants of the horizon circle to 1 mile, while the visibility in the other 

 two quadrants is 6 miles, the maximum visibility common to one- half of the 

 horizon circle is 6 miles, and code figure 97 would be used. 



Figure 4. --Non- uniform visibility 



4104. Figure 4 illustrates non-uniform visibility when may be the 

 result of squalls in one quadrant of the horizon circle, light showers and 

 haze in another and haze only in the third quadrant. Since the maximum 

 visibility common to one-half of the circle is 3 miles, it would be reported 

 as 2 miles (code figure 96). 



4200. CODING AND ENTRY OF VISIHLITY DATA (VV) ON FORM 615-5 



4201. Select the code figures from Code Table 5 corresponding to the 

 visibility and enter the figures in column 10. 



