I don't think it's something that's supposed to happen normally. It has something to do with some spirit portals Avatar Korra left open, or...something. [ She doesn't pay attention to the news as well as she should. ]

Hey! I'm sure I can bend, look at this. [ It takes her a moment, her expression twisting in concentration. All her other airbending stunts had been accidental. She's never attempted to bend on purpose, but she manages to send a gust of wind forward with a frustrated push of her hands. ] See?