over a period of 35 hours, and fetch was about U00 to 500 nautical miles; 

 therefore, the sea was fully developed. Stronger winds did not occur for 

 approximately 3 previous weeks. From Table 5 the sea state parameter 77 

 equals ll6. Stability index was about 9° F. Convergence or divergence 

 effects are not evident; therefore, the case is considered to be normal. 

 From the central solid and dashed (normal) curves in Figure 18, the pre- 

 dicted thermocline depth hp is 127 feet . 



Three BT observations were made on the prediction day. Thermocline 

 depth was 133 feet at 1000Z, 131 feet at l^OOZ, and 110 feet at l800Z. 

 The mean observed thermocline depth Hq was 125 feet. 



Example 2 - The prediction point (52°48 ! N, 35°30* W) shown in Figure 

 3^ has been situated at the western edge of a storm for about 8 days. On 

 27 and 28 March, wind force at the point and eastward from it was about ko 

 to 45 knots; during the next 6 days, wind force was about 30 to 35 knots 

 in the wind field east of the prediction point. Mean wind was about 35 

 knots in the entire wind field over the 8-day period, and minimum fetch 

 condition was satisfied; therefore, the sea was considered fully developed. 





e^. C f f r ^^fr/r^ 





x^S^^V ^ 





°V 







1 -*. 



V^Tfx^V////) 



j2v \ 



\lx /V ^-. ^Oi*k ^ 











^_ c 



7 ' 



[\3pXy/ hhiil 





ffi^Nf] 













%>>p°v\jAvv \ifl H 





MVT^ 



<l# 



r 

 3< 



1 / 



ce^ 



Sfc 



1° wK 





\I\jvYx 



X 



V* 





? Ay 



fj^ 





AX k 



^Psk \tf> \ vv^^ 



\ ^ ss *« 









ZL^3^ 



/ / // J^' uo °V~\i ' \ 

















/( ( ^Hyf/M^/ 



—t- 35 D -t-r 









- 







l t T^T~ 



— 1- 30° -A4— ^^ 



:: 1 













FIGURE 34 CONVERGENCE EFFECT CAUSED ATA PREDICTION POINT (52°48'N, 35° 30' W) BY A 

 WIND FIELD TO THE EAST. 12302, 3 APRIL 1953 -SHADED AREA INDICATES THE 

 APPROXIMATE CONVERGENCE ZONE. 



69 



