The Catfood Earth Beta now supports displaying weather radar images from over 160 sites around the Unites States. Just select the site closest to you and choose from Reflectivity, 1 Hour Precipitation, Storm Total Precipitation, Velocity, Storm Relative Motion and Long Range Reflectivity images.
The screen shot below shows 1 Hour Precipitation for San Francisco:
I'm currently offering a free license to anyone who provides feedback on the beta. See the Catfood Earth Beta for full details.