columns k6 - k9 wave direction, height am) period 



(or sea state) 



Enter the direction from which the dominant vaves come in Columns U6 and 

 ij-T according to WMO Code O885 (23B)* as shown in Table 9. (if wave height 

 is 16 feet or greater^ 50 must be added to code value of direction.) 

 Enter the height of the dominant vaves in Column 48 according to WMO 

 Code 1555 (k2)* shown in Table 11. (if Sea State is given, see note belcw. ) 

 Enter the period of the dominant vaves in Column ^9 according to WMO Code 

 3155 (69)* as shown in Table 12. 



To record Sea State ingtead of wave height and period, enter the state of sea (or amount) in Column US 

 according to WMO Code 3700 (75) * as shown in Table IS and cross out H in Column i8; leave Column i9 

 blank. 



COLUMNS 50 - 53 WIND DIRECTION AND SPEED (OR FORCE) 

 Enter direction from which the wind blows in Columns 50 and 51 according 

 to WMO Code 08T7 (23)* as shown in Table 9. Table 10 is for conversion 

 from points, q.uarter points, or a scale of 32. There is a choice of 

 either wind speed or force in this field: 



1. Wind speed in knots. Conversions are given inz 



Table l^i- (meters/second to knots) 

 Table 15 (ralles/hour to knots) 

 Table l6 (kilometers/hour to knots) 

 Table IT (feet/second to knots) 



2. Wind force according to the Beaufort scale as 

 defined by Table l8. (Do not use WMO Code llit-i4- (30)*.) 

 Important: the unit not used, i.e. speed or force, 

 should be crossed off the data form. 



*Number in parentheses represents old WMO Code number. 



