Has anyone notice, if you listen carefully, you can hear a loud humming sound in the background from the old Forecast Center set. Here's what I'm talking about:
Video 1
Video 2
http://www.youtube.com/watch?v=ZOHccqGsVY4 (The video's owner prevents external embedding)
You can even hear it whenever they would get to the maps. Here's an example in the first video with Dave Schwartz:
http://www.youtube.com/watch?v=58EpWyX9BxQ (The video's owner prevents external embedding)
So I was woundering, could it be some low buget air vents?