If you don't like the default Weather app that comes with the iPhone, there are a number of alternatives in the iPhone App Store. There are several free apps, as well as some more advanced paid apps. You can also use a local app or visit a weather web site.
You can also watch this video at YouTube (but with ads).
Apps mentioned in the video:
Free Apps
Paid Apps
WeatherSnitch is the only weather app I have on my iPhone right now. It doesn't do radar, but I've had RadarScope for two years now.
Just realized (duh!) the iPad doesn't have a built in weather app -- so this is very handy! Thanks.
How to search my local city in the weather channel app of iPhone 4?
Now the question is....how do you switch the yahoo weather to your newly selected one? As in delete yahoo weather as it is useless!
You can't, since it is built-in. So just relegate it to an app folder on your last page of apps.