TABLE 10 



Height 



WMO Code 1555 for recording height of the dominant waves 



Code 



Less than V4 m (1 ft) 



1 y2 m ( 1 1/2 ft) 



2 1 m ( 3 ft) 



3 1 1/2 m ( 5 ft) 



4 2 m ( 6 1/2 ft) 



5 21/2^(8 ft) 



6 3 m ( 9 1/2 ft) 



7 31/2 m (11 ft) 



8 4 m (13 ft) 



9 4 1/2 m (14 ft) 



X Height not determined 



Notes : 



^°^^ If 50 is added to direction 



5 m (16 ft) 



1 51/2 m (17 1/2 ft) 



2 6 m (19 ft) 



3 6 1/2 m (21 ft) 



4 7 m (22 1/2 ft) 



5 7 1/2 m (24 ft) 



6 8 m (25 1/2 ft) 



7 8 >/2 m (27 ft) 



8 9 m (29 ft) 



9 9 1/2 m (30 1/2 ft) 



(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 22/4 m (9 ft) ; 9 = 41/4 m (131/2 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 2% 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 >2 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. 



hk 



