Subj : Daily APOD Report
To   : All
From : Alan Ianson
Date : Wed Aug 11 2021 00:14:56

                        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.

                               2021 August 11

                      Mammatus Clouds over Saskatchewan
                Image Credit & Copyright: Michael F Johnston

   Explanation: When do cloud bottoms appear like bubbles? Normally, cloud
   bottoms are flat. This is because moist warm air that rises and cools
   will condense into water droplets at a specific temperature, which
   usually corresponds to a very specific height. As water droplets grow,
   an opaque cloud forms. Under some conditions, however, cloud pockets
   can develop that contain large droplets of water or ice that fall into
   clear air as they evaporate. Such pockets may occur in turbulent air
   near a thunderstorm. Resulting mammatus clouds can appear especially
   dramatic if sunlit from the side. The mammatus clouds pictured here,
   lasting only a few minutes, were photographed over Regina,
   Saskatchewan, Canada, just after a storm in 2012.

                 Meteor Shower Tonight: Peak of the Perseids
                   Tomorrow's picture: a beautiful trifid
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