Weather System

I'm trying to make a weather system for my map in 2 ways:
1: Certain areas of the map are snowy and have like a blizzard going on, while it's sunny in another section.
2: Say, every 20 minutes, the weather for the area changes, like the sunny area becomes cloudy, without affecting the snowy area.

How the hell can I do this? Seems tough. Haven't tried it yet, but I'm lazy :P I'll prolly start messing with it later though, if there aren't any responses.

create regions where you want that weather effects, check out environment-weather effect triggers and weather effect variables,

its pretty simple, you should be able to figure it out by yourself if you arent a completly idiot ;)

I'm not -.- Ok, thanks! :)