LEGEND AND EXAMPLES 



K 



DECREASED IN HEIGHT BELOW 

 a FEET AND LASTED 4 TO >300 HOURS 

 ON 24 OCCASIONS (150% X 16)* 

 DURING THE 



I I I ' I I I ' l-TT 



6552 OBSERVATIONS 



NUMBER OF OC- 

 CASIONS DURING THE SEA- 

 SON WHEN WAVES DE- 

 CREASED IN HEIGHT BELOW 

 5 FEET. 



1 I I rv'i'^.-j.i .i.i r 1^ r-i -K u-u ^ -i- 1. 



DURATION (HOURS) 



PERSISTENCE OF FAVORABLE SEAS (<5, 8, 12 FT.) 



iE TO 8 FEET OR HIGHER 

 LASTED 4 TO >300 HOURS 

 ON 24 OCCASIONS (150% X 16)** 

 DURING THE SEASON. 



WAVES ROSE TO 5 FEET OR HIGHER 



ND LASTED 3 TO >300 HOURS 



N 16 OCCASIONS (100% X 16) 



DURING THE SEASON. 



6552 OBSERVATtONS 

 16-AVERAGE NUMBER OF OC- 

 CASIONS DURING THE SEA- 

 SON WHEN WAVES ROSE 

 TO 5 FEET OR HIGHER. 



WAVES ROSE TO 5 FEET OR HIGHER 



AND LASTED 22 TO >300 HOURS 



ON 12 OCCASIONS (75% X 16) 

 DURING THE SEASON. 



WAVES ROSE TO 8 FEET OR I 

 AND LASTED 47 TO >300 

 ON 8 OCCASIONS (50% 

 DURING THE SEASON, 



WAVES ROSE TO 12 FEET OR HIGHER 

 AND LASTED 46 TO 186 HOURS ON 

 4 OCCASIONS (25% X 16) DURING 

 THE SEASON. 



f'aSiia 



I; 



DURATION (HOURS) 

 PERSISTENCE OF UNFAVORABLE SEAS (§5, 8, 12 FT.) 



LEGEND 



WAVE HEIGHT 



.^^ 





^vK'SjT 





, ^^^ ■■'1 



llllllllllillll 



10 20 30 40 50 60 70 80 90 100 

 SUMMARY SCALE 

 (ALL DIRECTIONS) 



FIGURE 7 WAVE PERSISTENCE CURVES AND WAVE HEIGHT BAR GRAPHS FOR NORTH SEA AND 

 BALTIC SEA LIGHTSHIPS 



