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This might be old information but I've never heard about it before. Winchester Bros. posted an article that featured an interview with Jensen Ackles where he mentioned that his father Alan Ackles lent his voice for "Weekend At Bobby's". Here's what he said:
Like most directors, Ackles also had a hand in casting the guest actors in the episode. So when it came time to figure out who would do the voice for the TV newscaster Bobby Singer is listening to, it was a no-brainer: Ackles’ veteran voiceover-actor father, Alan Ackles. 'I saw ‘Newscaster’ in the script, and I knew, ‘Well, that’s easy. My dad can phone that in.’ And he literally did. He phoned it in from the studio in his house in Texas, sitting in his bathrobe, sipping his coffee.'"