Have you seen Accuweather? Maybe on TV? Well, they’re on the web and their pro product is very cool.
Not only can you get the regular summary forecasts, but you can get hour-by-hour forecasts for the next 15 days. They offer 20+ different kinds of moving radar images. But the best part is this cool Flassh applet.
You punch in a location, and it gives you summary weather info for it. But you can click on certain things and get very detailed information that is just not available anywhere else. There is an instruction manual for the application, but I found the interface pretty self-explanatory.
They offer a 30-day trial with a credit card, and a year of access is only $40. It’s great if you travel a lot and are dependent on the weather.