I would assume that there are exemptions to the rules about consecutive games for just this sort of situation. Even tonight wouldn't have been scheduled for evening normally I don't think (though Detroit, where the Tigers are going, may be under the distance limit for that rule).
Yeah AIR Now is what I use. But you can certainly still get two very different AQIs miles apart.
I think the issue at this point is what's the cut-off for calling the game so as not to further inconvenience fans (and the Tigers). Also, the Phillies probably realize attendance (and therefore concession revenue) is going to stink, though that might turn out to be also be true for a make-up..