Csturdiv - Looks like winds will be out of the NW
tomorrow, 15-20mph gusting to 30mph. I'd bet on 27L/R arrivals. I've never spotted at the I-294 Oasis, so I can't say if you'd be bothered there. My fav spot is at Mannheim & Lawrence for 27L arrivals. I try to stay away from the Target lot - too many people wondering what you're doing and wondering if they should call the cops.
This is a great website for ORD
spotting trips (albeit a little dated): http://chicagoaps.tripod.com/caps/id16.html
Spot No. 1 is at the 27L arrivals. As long as you DON'T park in the parking lot there and park on the Scott Street, you'll be ok. The Schiller Park cops come by every other time I'm there, but I've never once been stopped by them. I usually try to get over there by 11:30am for the international arrivals.
Map for ORD 27L Arrivals
Enjoy! Its gonna be cold out there!