Southwest and AirTran cancelled all their flights out of ATL today and won't start flying until 1:00pm tomorrow. That seems a little extreme. I'm in suburban Atlanta this week for work and was able to drive to Waffle House for dinner without issue (though at 30 mph rather than the posted 55 mph). I would expect Southwest to run a partial operation like other carriers. As long as United is flying Friday, I'll be fine.