I've had this idea for a civilization existing completely under a dome. This would include their great city, an island roughly the size of Texas, and a fair stretch of ocean surrounding it. I'd like for apparently natural weather patterns to continue, including cloud formation and precipitation. Realistically, how high would this dome have to go for that? To clarify, there is an AI regulating everything from the temperature of the ocean to the energy output of an artificial sun embedded in the dome. This allows it to control the weather; it can even electrically charge the air if it's in a stormy mood. But like I said, I'm just not sure how big the dome needs to be for there to actually be any weather.