Here's what I do.
-Go to www.weather.com
-Enter your zip code.
-Scroll down to the radar image.
-Right click on it.
-Choose copy image location
-Paste the link somewhere and copy it down.
-Open the Internet Browser on your Blackberry.
-Go to the link for the image you copied down.
There's your radar image. Set it as a bookmark and then you can go back and check it anytime you want.
You can get the links for any zip code you want. Create a folder with all the different locations you want to check in your bookmarks and they'll all be neat and organized for easy referencing.