49. Cirrostratus Not Increasing and Not Covering the Whole Sky, Hg. 



Here is a sheet of cirrostratus (and parts of cirrociimulus) with clear 

 sky along the horizon in one direction. If the cirrostratus covers most 

 of the sky and the segment of blue sky is diminishing, it is coded Hs- 

 It is only when the segment of blue sky does not diminish that code 

 Hs is used. (Photo at Chevenne, Wvo., bv H. T. Floreen.) 



50. Cirrostratus Not Increasing and Not Covering the Whole Sky, Hs- 



A sheet of dense cirrostratus covers nearly all of the sky. In this 

 case the strip of clear sky near the horizon persisted for at least 12 

 hours; the upper clouds moving in a direction parallel to the edge of 

 the sheet. The lower clouds in this picture should be coded ii and 

 the upper clouds, Hs- (Photo by G. A. Clarke in the International 

 Atlas.) 



86 



