Tonight's Guest WeatherBrain is the teaching professor in meteorology and the associate head of the undergraduate program in meteorology at The Penn State University. He is also the host, feature writer, and producer of Weather World, Penn State Meteorology Department's weekday weather magazine show. He also produces a segment on Wednesday's called WeatherWhys (WxYz).  In addition, he was an on-air storm analyst at The Weather Channel from 2002 to 2005 (just after Dr. John Scala was there) and was the chief meteorologist at the historic Franklin Institute Science Museum in Philadelphia from 1998 to 2002. He has also co-authored two books: "The Philadelphia Area Weather Book" and "A World of Weather: Fundamentals of Meteorology."  Dr. Jon Nese, welcome to WeatherBrains!