Thanks for trying man, you just got work for St.Lassie (woff & praise her holyness)!

Anyway, you are the third person on the planet that have provided any kind of response on this this little issue. Thus I would say that we can all safely assume that weather in MTW is hardcoded as far as campaigns go. VI or MTW - it does not matter. Because, there is nothing that I am aware of that suggests anything otherwise so far. A shame really because I am fairly cretain that you could creat some really cool fog or possibly storms like in STW and things like that. It is probably very possible within the framework of the game - its just hardcoded not to be possible that's all...