RETURN PERIOD IN YEARS 

 5 10 20 40 60 



S 60.0 - 



40.0 



50.0 80.0 90.0 95.0 98.0 99.0 



CUMULATIVE PROBABILITY SCALE 



EXTREMAL TYPE I 



Figure C13. Gulf of Alaska, l8-hr averges 



99.9 



80.0 



S^" 60.0 



£ 40.0 



20.0 - 



RETURN PERIOD IN YEARS 

 5 10 20 40 60 100 



) 50.0 80.0 90.0 95.0 98.0 99.0 



CUMULATIVE PROBABILITY SCALE 

 EXTREMAL TYPE I 



Figure C14. Gulf of Alaska, 21-hr averages 



C8 



