Contrails & shadows
Montana Contrail Shadow imaged by James Perdue at Culver Pond in Red Rock Lakes National Wildlife Refuge. Image �James Perdue, shown with permission.

The high contrail comprised of water droplets and possibly ice crystals has cast a shadow deep down into the atmosphere.  The shadow is a 3D volume of dark air. In contrast, many contrail shadows cast onto lower cloud or haze layers are 2D.

More contrails below...


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