ENTRY OF CLOUDS ON RECORD FORMS 



The proper method of entering cloud observations on record forms, 

 including abbreviations, are described in the instructions accompany- 

 ing the forms. 



Abbreviations. — Abbreviations in the International Atlas are of the 

 form shown by the following examples: Cist., Acu., Stcu., and Cunb., 

 etc. These merely constituted a simplification of the abbreviations 

 previously used, for example, Ci.-St., A.-Cu., St.-Cu., and Cu.-Nb., 

 etc. The International Meteorological Organization in a meeting at 

 Warsaw in 1935 adopted shorter abbreviations which supersede those 

 shown in the International Atlas. The Warsaw abbreviations are as 

 follows: 



Cirrus Ci 



Cirrocumulus Cc 



Cirrostratus Cs 



Altocumulus Ac 



Altostratus . As 



Stratocumulus So 



Stratus St 



Nimbostratus Ns 



Cumulus Cu 



Cumulonimbus Cb 



The Warsaw abbreviations and, in addition, the following four 

 special abbreviations have been adopted by the Weather Bureau, 

 effective January 1, 1939: 



Fractostratus Fs 



Fractocumulus Fc 



Altocumulus castellatus Ace 



Cumulonimbus mammatus (Mam- 

 mato cumulus) Cm 



15 



