In the scene, Weather Wizard mentioned to Rag Doll that a "storm is coming." Initially, it seemed like he was alluding to some method that may give him his powers back, but what if he sensed his daughter was coming for him? Assuming Weather Witch's power matches that of her father and nickname, he might be able to sense her presence in some way. Either that, or she sent him a very threatening letter saying she was gonna kill him.