Okay... first, a confession-- a week ago, I had no idea what a tempest was. A quick search on Dictionary.com defines a tempest as a violent windstorm.
Back in the pilot episode (yes... the very first episode), it began raining (not just raining... I mean, torrential downpour). Charlie even asked Kate and Jack, "Hey, guys, is this normal? Day turning into night? Sort of end-of-the-world-type weather?" Locke was even able to predict rain (on several occasions), and Walt was able to stop the rain. So, weather has always played a part in the mysteries of the island. So, with this post, I'm proposing a new theory-- the newly revealed Tempest station controls the weather on the island.
Thoughts? Leave me a comment, or e-mail me.