Wii Weather – Japan has weird clouds

[youtube]http://www.youtube.com/watch?v=6jHE2kPb5Wc[/youtube]

Infendo reader and commenter srkelley noticed something interesting on his Wii Weather Channel.  Compared to the rest of the world, Japan has different weather icons.  [Check out the cute snowman icon at around one minute in.]  Does anyone know why?