I use this site:
http://www.wunderground.com/
Just put in your zip code and bookmark the page. I've found it to be far more accurate for my area than anything from the weather channel, and it has a nice real-time radar. It's a bit heavy on the ads, but I use FireFox so it's tolerable
The radar lags by about five minutes; to get full animated radar coverage of the daylight hours you must subscribe.
$5.00 for a year with NO ads. Well worth the cost. They also have people with home weather stations sending feeds to them, so you can see real time local weather.
For $5.00 a year the site is ad free. I have been a member for a couple of years.