RETURN PERIOD IN YEARS 

 5 10 20 40 60 



> 20.0 - 



j.O 50.0 80.0 90.0 95.0 98.0 99.0 



CUMULATIVE PROBABILITY SCALE 

 EXTREMAL TYPE I 



Figure C9. Gulf of Alaska, 8-hr averages 



>- 60.0 



RETURN PERIOD IN YEARS 

 5 10 20 40 60 100 



a: 20.0 - 



I.O 



50.0 60.0 90.0 95.0 98.0 99.0 



CUMULATIVE PROBABILITY SCALE 



EXTREMAL TYPE I 



99.9 



Figure CIO. Gulf of Alaska, 10-hr averages 



C6 



