Table 19 

 Wave Forecast for Womens Bay Fetch Based on NWS Wind Data 



Duration 

 hr 



1 

 3 



10 



Return Period, year 



20 



40 



50 



60 



100 



1.8, 4.2 2.0, 4.2 2.2, 4.7 2.6, 5.0 2.6, 9.0 2.7, 5.0 2.9, 5.2 

 1.1, 3.7 1.4, 4.0 1.7, 4.3 2.1, 4.6 2.3, 4.7 2.3, 4.8 2.5, 4.9 



Note: First number under Return Period indicates Significant Wave Height, m; 

 second number indicates Peak Period, sec. 



48. A similar translation of winds from the Gulf of Alaska (Figures C6- 

 C17) was performed using the deepwater forecasting curves with duration as the 

 only limitation. Table 20 indicates a duration of 24 hr as the extreme condi- 

 tions in this case with low probability deepwater significant wave heights 



Table 20 

 Wave Forecast for Gulf of Alaska Based on NWS Wind Data 























Duration 









Return Period, 



year 









hr 





5 



10 



20 



40 



50 





30 



100 



12 



5.5, 



10.9 



6.4, 11.4 



7.3, 12.0 



8.2, 12.6 



8.5, 12.8 



8.8 



13.0 



9.1, 13.3 



15 



5.8, 



11.7 



6.7, 12.3 



7.9, 13.1 



8.8, 13.8 



9.1, 14.0 



9.5 



14.1 



10.4, 14.8 



18 



6.7, 



12.6 



7.6, 13.4 



8.5, 14.1 



9.5, 14.7 



10.1, 15.0 



10.4 



15.1 



11.0, 15.5 



21 



7.0, 



13.3 



8.2, 14.2 



9.1, 15.0 



10.4, 15.8 



10.7, 15.9 



11.0 



16.1 



11.9, 16.6 



24 



7.0, 



13.9 



8.5, 14.6 



10.1, 15.8 



11.3, 16.4 



11.6, 16.8 



11.9 



16.9 



12.8, 17.3 



27 



7.0, 



14.2 



8.2, 14.8 



8.8, 15.5 



9.8, 16.1 



10.1, 16.3 



10.4 



16.4 



11.0, 17.0 



30 



6.7, 



13.8 



8.2, 15.3 



9.8, 16.2 



11.0, 17.0 



11.3, 17.1 



11.6 



17.2 



12.5, 17.9 



Note: First number under Return Period indicates Significant Wave Height, m; second number 

 indicates Peak Period, sec. 



very close to those predicted using the WIS data base (see Table 21). The 

 duration over 21 hr for the low probability events have corresponding fetches 

 on the order of 300 to 400 nautical miles. Though no physical barriers to the 

 wind exist, this distance is on the scale of the synoptic weather patterns. 

 The variations of velocity across weather patterns of this scale are modeled 

 by the WIS data base, but are not using the NWS point source of data. This 

 inadequacy, along with the other measurement errors inherent in land-based 

 anemometers, indicates that the statistics from the WIS data base are more 

 reliable, as applied here, for wave conditions at Kodiak. 



51 



