VI, Swell Amount 



Code 



: Approximate 

 : Height (ft) 



Description 



: Approximate 

 : Length (ft) 



No Swell 



to 600 

 Above 600 



1 to 6 



Low Swell 



Short or 



Average 



Long 



6 to 12 



Moderate 



Short 



Average 



Long 



; to 300 

 ;300 to 600 

 : Above 6OO 



Greater 

 than 12 



High 



Short 



Average 



Long 



to 300 



300 to 600 



Above 600 



Confused 



VII. Visibility 



Code 



Dense Fog 50 yards 



1 Thick Fog 200 yards 



2 Fog 400 yards 



3 Moderate fog 1000 yards 



k Thin fog or mist 1 mile 



5 Visibility poor 2 miles 



6 Visibility moderate 5 miles 



7 Visibility good 10 miles 



8 Visibility very good 30 miles 



9 Visibility excellent Over 30 miles 



VIII. Water Color 



C^e (Percent yellow) Description 



00 Deep blue 



10 Blue 



20 Greenish-blue (or green blue) 



30 Bluish-green (or blue green) 



kO Green 



50 Light Green 



60 Yellowish-green 



70 Yellow green 



80 Green yellow 



90 Greenish-yellow 



99 Yellow 



5^ 



