III. Cloud Type 



Code 



Stratus or Frac to stratus 



1 Cirrus 



2 CirrostratuB 



3 Cirrocvunxalus 



4 Altocunnjlus 



5 Alto stratus 



6 Stratuscuraulus 



7 Nimbo stratus 



8 Cumulus or Fractocumulus 



9 Cumulonimbus 



IV, Cloud Amount 



Code 



No clouds 



1 Less than l/lO or l/lO 



2 2A0 and 3A0 



3 4/10 



4 5/10 



5 6/10 



6 7/10 and 8/10 



7 9AO and 9/10 plus 



8 lOAO 



9 Sky obscured 



V. Sea Amount 



Code 



Approximate 

 Height (feet) 



Description 



Less than 1 



1 to 3 



3 to 5 



5 to 8 



8 to 12 

 12 to 20 

 20 to 40 

 40 and over 



Calm 



Smooth 



Slight 



Moderate 



Rough 



Very Rough 



High 



Very high 



Motmtainous 



Very rough 



confused sea 



71 



