I seem to remember (could be wrong) that REX (is that "Real Environment X") is continually-online-updated weather for fsx?
This FEX software is similar to that for fs9 (just cloud and water textures) and I think, again, there is a "Ground Environment X" package like the one for fs9; you can see textures from this in my screenshot of the Lindbergh Ryan monoplane in my Profile Page album; an example of the nice clouds in the fs9 software are shown in the Hawker Nimrod screenshot.
Thanks for your interest anyway, GSpector...