My favorite weather site is now Weather Underground. I have had problems with weather sites in the past - slow loading times, too many ads, poor layouts where you can't find what you are looking for on the front page. Weather Underground is fast and well laid out - and most important has a feature called Wundermap that is the most accurate weather radar system I have found. Using a google maps type drill down map, you can clearly view your current weather and the track of storms coming your way. I can predict the start of rain to within minutes!
Check it out - Weather Underground