Answering the weather question in >>1370
, what I've planned for the spinoff continent is that it's rains would be made by alpaca natives, who create the clouds by periodically dumping huge vats of water into a volcano.
Speaking of weather, one episode could be about ponies getting their own weather facility started. Some of the older ponies protest, telling that messing with the natural order is a terrible mistake, and when troubles start arising the other townsponies soon come around to their side and the weather factory is closed.
However, the troubles don't seem to be going away. While everypony is still placing their blame on the facility during its operation, the mane cast seeks out and fixes the real cause disturbing the nature. The lesson of the story is that when you assign blame carelessly, you're not only hurting innocents but also directing attention away from the real culprit.