12 



Code 

 figures 



Code Table XIII 



Symbol C L — Form oj low cloud 



Form of cloud 



No low clouds. 



1 Cumulus of fair weather. 



2 Cumulus (large, without anvil). 



3 Cumulo-nimbus. 



4 Strato-cumulus (spread from cumulus) . 



5 Stratus or strato-cumulus (in layer). 



6 Nimbus (ragged low clouds of bad weather.) 



7 Cumulus and strato-cumulus of fair weather. 



8 Cumulus, large (or cumulo-nimbus) and strato-cumulus. 



9 Cumulus, large (or cumulo-nimbus) and nimbus. 



Code Table XIV 



Symbol C M . — Form of middle cloud. 



Code 

 figures 



Form of cloud 



No middle cloud. 



1 Alto-stratus, typical thin. 



2 Alto-stratus, typical thick (sun or moon invisible). 



3 Alto-cumulus or high strato-cumulus, single layer. 



4 Alto-cumulus, in bands, decreasing. 



5 Alto-cumulus, in bands, increasing. 

 Alto-cumulus, spread out from cumulus. 



Alto-cumulus, with alto-stratus; or alto-stratus with parts resembling alto-cumulus. 

 Alto-cumulus castellatus (alto-cumulus in ragged fragments). 

 Alto-cumulus in several layers, generally with fibrous veils and chaotic appearance of sky. 



Code Table XV 



Symbol C H . — Form of upper cloud 



(Cirrus cloud) 



Code 

 figures 



Form of cloud 





 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



No upper clouds (cirrus type). 



Cirrus, fine, not increasing; scarce. 



Cirrus, fine, not increasing; plentiful but not a continuous layer. 



Cirrus, anvil. 



Cirrus, fine, increasing. 



Cirrus or cirro-stratus increasing, below 45° altitude. 



Cirrus or cirro-stratus increasing, and reaching above 45° altitude. 



Cirro-stratus, veil covering entire sky. 



Cirro-stratus, not increasing, and not covering whole sky. 



Cirro-cumulus predominating, and a little cirrus. 



