Knights of Tezoth

Or if you set up some kind of storm in Ravnland, how long would it last? And what would it affect?

That's only in battle. You cast rain, and Burn becomes ineffective, etc.

Can we get a full list of "weather conditions" and what effect they give?

I didn't understand anything... Do we continue roleplaying as usual until our turn in the mafia is passed, or what?