The popup building/landscape is making Oblivion unbearable to play. I cover it up with heavy fog weather. But, Wrye Bash tends to cancel out multi-weather choice mods or be constantly needs to be reactivated. Could some one create a single weather mist/fog mod that perpetually covers Cyrodiil and not be negated by Bash patch? Thanks

All Natural includes some ini settings allowing you to set the fog to whatever level you want. I use the recommended "Morrowind" settings to achieve a level of fog similar to what you have in vanilla Morrowind. All Natural's fog settings are fully compatable with a bashed patch.

Another option is the fog mod made by Pseron Wyrd. However, I just did a google search for it and could not find it.

I second Turija's recommendation for All Natural. It does exactly what you want.

Have you seen this: http://www.nexusmods.com/oblivion/mods/25052/ by Sfon? Looks like pretty close fog.

why don't you use raevwd?