Codes 1 & 2 CIRRUS & CIRROSTRATUS -» 



H5' Cirrus and cirrostratus, often in bands 

 converging; toward the horizon; or cirrostratus 

 alone; in either case gradually spreading over 

 the sky and usually thickening as a whole, 

 but the continuous layer not reaching 45° 

 altitude. 



When cirrus is present, the angular altitude 

 refers to the leading edge of the cirrostratus 

 layer. 



Codes 1 & 2 CIRRUS & CIRROSTRATUS -> 



H6: Cirrus and cirrostratus often in bands 

 converging toward the horizon; or cirro- 

 stratus alone; in either case gradually spread- 

 ing over the sky and usually thickening as 

 a whole, and the continuous layer exceeding 

 45° altitude. 



When cirrus is present, the angular altitude 

 refers to the leading edge of the cirrostratus 

 layer. 



Code 2 



CIRROSTRATUS -> 



H7: Cirrostratus covering the entire sky. 



During the day, when the sun is sufficiently 

 high above the horizon, the sheet is never 

 thick enough to prevent shadows of objects 

 on the ground. 



H. O. 607 



177 



