One name has been on millions of minds — and all over the news — in the past week: Hilary.It's been decades since a storm like this has hit Southern California, so even some scientists were shocked when they heard it was coming. In today's episode, Regina Barber talks to Jill Trepanier, who studies extreme climatic events — like hurricanes and climate change — at Louisiana State University. She tells us how we use science to predict events like this, and what Hilary and future storms may or may not tell us about the changing climate. Have an interesting science story to share? Email us at shortwave@npr.org.