I have known about this FSX addon for a while now, and apparently it's awesome ( I can't comment first hand though )
It's called Real-Environment-Xtreme (REX) and it looks quite amazing. Just look at those clouds
Take a look chaps. With SoW apparently third party friendly, something like this could be a future possibilty (unless the team make the most jaw-dropping clouds ever...)
I mean, with SoW's particle physics, working in collaboration with a company like this could produce great results (although maybe not free results...)