One of the biggest things to keep in mind is that every little hollow, flat, ridgetop, draw etc. will have it's own characteristics as far as thermals and wind directions go. And these will usually stay consitent.......until a different weather front moves in. Here in SW PA, I can bank on a prevailing South-southwest-west wind on normal days. That doesn't really mean anything, until I get into my spots and see how that particular prevailing wind behaves in that particular piece of woods. Then you have to account for the thermals also. Now on a day when a cold front moves in, I'm normally looking at a North/northwest wind, so then I have to alter my tactic to account for a wind coming in basically the opposite direction. Sometimes you just have to sit a spot and see what happens. After a year or 2 of playing in a certain spot, you can get acquainted with how the wind behaves in certain weather patterns, and adjust accordingly. Some stands will be bulletproof, they won't wind you no matter what. And others, well, you may abandone after one sit, or wait for a different weather pattern to switch the wind for you.