I have five “hot link” websites available to check for weather situations. Two are for local TV station radars, two are some specialty sites for local amateur (I assume) stats and pictures.
My first click is always on Intellicast’s National Radar to get an overview of the country’s situation.
What’s your first choice site?
I go to Weather Underground
That’s one of my five, too. I have it set for my ZIP code and use that for the up-close radar views. Their pictures are great also and I have my wallpaper from their galleries.
Another seconday site in my five is http://weatherbonk.com/weather/ also tailored to my ZIP.
heh. I assumed this was going to be a joke. Great site!!
I have been using my-cast for free web weather for several years now.
http://www.digitalcyclone.com/products/free-web-weather/
They want you to subscribe to their mobile web service, but the free link is easy to bookmark.
You can keep track of more then 20 different locales. I don’t really know the upper limit but every time I go to a new installation, I add the zipcode.
The best thing about the site is that you get closeup animated NexRad images.
I can get a resolution down to about 1.5 miles, which can really do a good job of telling me when a shower is going to start and when it should end.
Yeah, I guess we’re showing our age in that I too wondered if they named their site that way as a joke. 
I like the Unisys site set to my zip code. I love looking at the 12-hour loops of local or global radar and satellite images.
I will have to check out that site. In the summer it is nice to figure out if you can sneak in a dry bike ride between rain showers.
I love the full map of the US here:
http://radar.weather.gov/Conus/full_loop.php
I admit that I am partial to the government for weather.
I like the personal weather station, PWS, a couple of miles from my home for reports. For forecasts I find an AM radio station’s web-page to be the best.
Same here, considering all the commercial weather outfits use National Weather Service data and forecasts anyway.
Great stuff! My personal favorite (for this time of year) is The Chase: live, streaming dash cams by honest-to-god tornado chasers. The A-One Best way to chase tornadoes without being at risk from one.