plains

Hi guys, So I'm playing through FFX-2 going for a perfect game (100% completion), and I can't find the tenth lightning tower to calibrate in the Thunder Plains, chapter 2. I've been trying to remember if it's hidden somewhere, or fallen down, but the farthest one north (towards Macalania Woods...

I'm trying to figure out how often the seasons change from the Dry to the Rains. I just beat Gil Snapper and want to claim my rewards for a couple quests but can only do it in the Dry. Any idea when it will change again, I just got Larsa in my pt as guest.