4. Height of upper surface. 



5. Description of structure: 



a. Detached flat clouds. 



h. Detached clouds mth vertical development. 



c. Layer with openings, 



d. Continuous layer. 



6. Appearance of upper surface of clouds: 



a. Smooth or slightly rippled. 

 h. Lumpy or rough. 



c. With cumuliform bulges. 



d. With towers and tops resembling cumulonimbus. 



7. The presence of clouds at two or more levels should be noted 



and described separately. 



8. Presence of ice, snow, or water droplets should be noted in 



passing through clouds. 



9. Separation of the particles of ice, water, or snow, that is, 



are they widely separated so that the cloud appears like 

 a thin mist or does the cloud appear dense when the observer 

 is passing through it? 



91 



