Couple of concentric radar rings in Southern Oregon and Northern Washington right now. Just have a modified pic of Oregon one, didn't know how to save animation that showed it without my orange ring overlay.
This is where I saw them:
http://www.intellicast.com/National/Radar/Current.aspx?location=USOR0284
This is where I saw them:
http://www.intellicast.com/National/Radar/Current.aspx?location=USOR0284