I had quite a few Onion Radio News segments mixed into my playlists for fun, but it did also break up the music quite a bit too.

As far as being notified about impending doom, I figure there will be enough signs of something going wrong to figure it out. Though I probably should look into an SMS system or something for things like tornado warnings, after having a funnel cloud pass by my place a few weeks ago.

*edit* Looks like it is being worked on already by the FCC.