It can't. It just predicts rain by hurting a lot.
While you were gone, I busted my foot again. After hiking with my sis-in-law and her kids, we decided to go to the swimming hole for a dip. It had rained recently, and the water was cloudy. I'm not as familiar with what's at the bottom of the swimming hole, as I've only been there once before.
I jump in and hit the rocks at the bottom. My right foot folded beneath me and turned purple.