TABLE 11 



Height 



WMO Code 1555 for recording height of the dominant waves 



Code 





 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



X 



Code 



If 50 is added to direction 



Less than V4 m (1 ft) 

 1/2 m ( 1 % ft) 



1 m ( 3 

 1 1/2 m ( 5 



ft) 

 ft) 



2 m ( 6 1/2 tt) 



2 1/2 m ( 8 ft) 



3 m ( 9 1/2 ft) 

 31/2^ (11 ft) 



4 m (13 ft) 

 4 1/2 m (14 ft) 

 Height not determined 



Notes : 



(1) Each code figure provides for reporting a range of heights. For example: 1 =% m 

 (1 ft) to 3/4 m (21/2 ft) ; 5 = 21/4 m (7 ft) to 23/4 m (9 ft) ; 9 = 41/4 m (13 V2 ft) to 43/4 m 

 (15 ft), etc. 



(2) If a wave height comes exactly midway between the heights corresponding to two 

 code figures, the lower code figure is reported; e.g. a height of 23/^ m is reported 

 by code figure 5. 



(3) In aeronautical forecast codes, only the left-hand table is to be used and code 

 figure 9 has the meaning : 4 >^ m (14 ft) or more. 



(4) The average value of the wave height (vertical distance between trough and crest) 

 is reported, as obtained from the larger well formed waves of the wave system being 

 observed. 



38 



