If you are curious as to what kind of weather you will be experiencing, the most reliable source is a dopler system. My boss always checks this thing out at work and when he's home. It's pretty cool. I would recommend bookmarking this. Click on your state or section of the U.S.:

http://radar.weather.gov/Conus/index_lite.php

Sorry, Canadians and anyone else outside of the U.S., I can't find one for you guys. There might be another one on this site somewhere or even on another dopler on another website.