I spoke with an agent, who said they are being told there's a 70% chance that tomorrow's flights will operate.

In addition, although my flight is in the "advisory period", because I have not yet begun travel and my flight has not canceled, a fare difference would apply. The alternate-airport option is for those whose trip has already begun, and for those who have seen their flight canceled.

So...STL it is, at least for now. I'm fortunate that travel is a week out, so there's a good shot my flight will still operate. The crappy thing is that alternate cities are so full on my travel date that if my flight does cancel a few days from now, there probably won't be alternatives at that point.

On the bright side, I'll have some first-hand experience seeing how bad STL really is. Seeing a youtube video of Terminal E was interesting since I've spent quite a bit of time there, and E wasn't even hit badly. I wonder what the main terminal and esp C are like.