Skaeps.mp3...would you perchance know how to script such a script? I have NO scripting abilities what-so-ever and I would be terribly appreciative if you could provide one...
You would have to change the region ID of the cell in question to something unique.
world->regions->new
then:
world->exterior cell->region weather type
...to your new unique ID.
You can set the weather chances when you create the new region, they must add up to 100, but you can have the chances divided as you see fit. Any of them can be 0 or 100 too if you want to gaurantee a certain weather type, but they must all add up to 100.
If you want the weather to change at a certain time, after a quest for example, you could use a local script since it is only one cell. Post back here if you need something specific like that.
Also: Welcome Back