If there is going to be a snow day in the Ann Arbor area, where do you look?
My first inclination is on twitter, in the hopes that someone knows better than me in real time.
Snow days go on television: Channel 2 snow day listings, Channel 4 snow day listings, Channel 7 snow day listings. These all cover greater Metro Detroit.
Snow days go on the radio; check 24 hour news stations like WJR 990 and WWJ 760.
Snow days are announced without the assistance of the media, e.g. Ann Arbor Public Schools which publishes directly.