Haunted Plains of Whiterun
So, I've pretty much had it with the 'hardcore weather' type mods that claim to make the weather conditions extreme, but instead only push them ever-so-slightly harsher than vanilla... so I made my own! Fog is a tough one, but I managed to create some of my own textures to get the fog just right so that it blocks out the sun, the sky, and all the distant landscape through a combination of weather changes, image space changes, and adding my own texture and precipitation effect.
What I've got here is the Haunted fog weather type, complete with that ghastly green :D
Bonus points to whoever can spot the ghostly face floating through the fog! (Still deciding whether or not those are too cheesy)