Shelf clouds are typically seen at the leading edge of a thunderstorms. What you're seeing in a shelf cloud is the boundary between a thunderstorm downdraft and updraft. Shelf clouds form as warm, moist air rises along the front edge of a gust front ...
via New Artwork by James Bo Insogna http://james-insogna.artistwebsites.com/featured/shelf-cloud-mamacumulus-leading-edge-james-bo-insogna.html
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