AEROGRAPHER'S MATE 3 & 2 



is the routine synoptic ship report:: received 

 four times daily. 



The ship synoptic code (FM 21 .( )) is dis- 

 cussed in the previous chapter. The first three 

 groups provide information to locate the re- 

 porting station (ship) in time and space on the 

 sea condition chart. Of the remaining groups, 



group 3P w PwHwHw and dy/d^PwHwHw provide 

 information for plotting wind wave and swell 

 wave height, period, and direction on the sea 

 condition chart. Figure 11-22 is an example 

 of a plotted sea condition chart. 



The surface wind is plotted on the sea con- 

 dition chart in the same manner as it is on 

 the synoptic surface chart. The direction of the 

 sea is plotted using an arrow for direction 

 (commencing at 0° North and increasing clock- 

 wise). The arrow points TOWARD the direction 



the sea is moving. Period and height are 

 plotted to the right of the arrow. 



Swell is plotted to the right of the sea plot, 

 using an identical procedure. The lower right- 

 hand corner of figure 11-22 shows plot con- 

 taining both sea and swell. In this example the 

 surface wind is from 320 degrees with a speed 

 of 35 knots. The sea is from 320 degrees with 

 a 5-second period and a height of 7 meters. 

 (See NA50-1P-11 for related code tables.) The 

 swell is from 340 degrees with a 4-second per- 

 iod and a height of 2 meters. 



Plotting Sea Surface Temperatures 



Sea surface temperatures are the most easily 

 obtainable oceanograpbjc parameters and are 



1 r* 



i ft 



•H* 



Eft 





I 

 I 



6j5 



! 

 I 



fk 



,<\Wk 



+ 3& 



4u™ 



ek 



• • . * ♦ 



60 i.« 





209.297 



Figure 11-22. — Plotted sea condition chart. 

 218 



