So, while reading the book, a few thoughts came to me. I didn't see anything like them posted yet, so I thought I'd see what everyone thinks. Feel free to merge them, or run with them, to create something a little more cohesive.
1. Seasons last only a few weeks, but a flashback scene indicates that seasons used to last about 40 days. This leads me to believe that the planet is actually tilting on it axis back and forth at a much greater rate than it one was.
2. The Highstorms are vast in size, and come fairly often. Perhaps the planet is also spinning too fast. This could mean that the Highstorms are an effect of this spinning, or since they come from the "Origin of Storms", they could be a manufactured way of altering the planets spin to something habitable.
3. The Shattered Plains, when viewed from above, seem to have a large center, with radiating cracks. This could be from an enormous impact, which may have some bearing on the previous two points.
4. (Absolute madness, but a thought) What if one of the moons was part of the planet at one point, and the loss of mass is what altered the planets motion? Or, what if some crazy powerful lashings to one of the moons is what shattered the plains and threw the planet off?
I have some other thoughts, but I think this will be a good start. Let me know what you all think, and maybe it will turn out I'm not all that crazy after all!