47. Cirrus or Cirrostratus Advancing Over the Sky and More Than 

 45° Above the Horizon, He,. 



Here the cirrus clouds are united in places to form patches like 

 cirrostratus. This form is like the preceding one except that the 

 clouds are more than 45° above the horizon. If the sheet covers the 

 whole sky, however, code H^ is used. In this picture parts of the sheet 

 are cirrocumulus, which may be present in any of the code classifica- 

 tions from Hi to i/g. (Photo at Cheyenne, Wyo., bv H. T. Floreen.) 



48. Veil of Cirrostratus Covering the Whole Sky, H^. 



The preceding type, while more than 45° above the horizon, did not 

 cover the whole sky. The entire sky must be covered if the cloud is 

 to be coded Ht, which is presumably the case in tliis picture. The 

 presence of a halo shows this sheet to be definitely cirrostratus. It 

 has little detail but is plainly seen to be fibrous in places. (Photo at 

 Aberdeen, Scotland, by G. A. Clarke.) 



84 



