VI, Swell Amount 



Code 



Approximate 

 Height 

 (feet) 



Description 



Approximate 

 Length 

 (feet) 











No 



swell 



' 



1 

 2 



1 to 6 



Low swell 



Short 



Average 



Long 



■ to 600 

 Above 600 



3 

 4 

 5 



6 to 12 



Moderate 



Short 



Average 



Long 



to 300 



300 to 600 



Above 600 



6 

 7 



8 



Greater 

 than 12 



High 



Short 



Average 



Long 



to 300 



300 to 600 



Above 600 



9 





Confused 





Code 



VII o Visibility 



Dense Fog ■ 50 yards 



1 Thick Fog 200 yards 



2 Fog 400 yards 



3 Moderate Fog 1000 yards 



4 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 



72 



