Chill Factor - Rachel Caine - paperback

The Weather Warden series, book 3

Weather Warden extraordinaire Joanne Baldwin, who protects the human race from monster storms, was killed, reborn as a Djinn, and then restored to her original form. She has been through a lot- and stuck her neck out many times, to save innocent lives.

Now she is rolling the dice to stop an infinitely powerful, deeply disturbed kid from destroying the world.