Since wind direction and position of the wind field with respect to 

 the prediction point did not change for about 8 days, a well-developed 

 convergence effect could be expected at the prediction point. The value 

 of tj for wind speed of 35 knots and fully developed sea is U58 (Table 5)» 

 Stability index was about 2° F. By application of the upper solid and 

 dashed_( convergence) curves in Figure 15, the predicted mean thermocline 

 depth h p is 388 feet . 



The mean observed thermocline depth computed from 8 BT's taken during 

 3 days (2-5 April) was 370 feet . 



Example 3 - The prediction point (52 48' N, 35°30* W) lay in a diver- 

 gence zone within cyclonic wind fields for about ^+0 hours. The center of 

 this cyclone moved into the prediction area during the afternoon of 29 

 May and remained stationary until 1230Z 31 May as shown in Figure 35* 



FIGURE 35 DIVERGENCE EFFECT CAUSED AT A PREDICTION POINT (52° 48' N, 35° 30' W) BY 



WIND FIELDS TO THE NORTHWEST AND SOUTHEAST. I230Z, 31 MAY 1950 -SHADED 

 AREA INDICATES THE APPROXIMATE DIVERGENCE ZONE. 



70 



