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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                  2025 August 17   
      Trees and mountains line the bottom of a landscape image with blue sky   
       visible above. The sky is otherwise dominated by a large and unusual   
      cloud that is brown and gold and has many waves and structures. Please   
                see the explanation for more detailed information.   
      
                         Asperitas Clouds Over New Zealand   
                     Image Credit & Copyright: Witta Priester   
      
      Explanation: What kind of clouds are these? Although their cause is   
      presently unknown, such unusual atmospheric structures, as menacing as   
      they might seem, do not appear to be harbingers of meteorological doom.   
      Formally recognized as a distinct cloud type only last year, asperitas   
      clouds can be stunning in appearance, unusual in occurrence, and are   
      relatively unstudied. Whereas most low cloud decks are flat bottomed,   
      asperitas clouds appear to have significant vertical structure   
      underneath. Speculation therefore holds that asperitas clouds might be   
      related to lenticular clouds that form near mountains, or mammatus   
      clouds associated with thunderstorms, or perhaps a foehn -- a type of   
      dry downward wind that flows off mountains. Clouds from such a wind   
      called the Canterbury arch stream toward the east coast of New   
      Zealand's South Island. The featured image, taken above Hanmer Springs   
      in Canterbury, New Zealand in 2005, shows great detail partly because   
      sunlight illuminates the undulating clouds from the side.   
      
                        Tomorrow's picture: working spiral   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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