MIKE MOSS SAYS: Duane, I started answering your question, and because so many others have asked essentially the same thing, and because the answer became pretty long and involved, I decided to turn it into a broader topic for a "WeatherCenter Blog" entry. So, just go to our main weather page and look for the WeatherCenter Blog link, or more directly, the address is
http://www.wral.com/weather/blogpost/2002957/