FYI - I haven't seen and specific stats on the wind, but a buddy who is at the game just called and said the flags are pointing in today. They were this way yesterday as well, but obivously that didn't make much of a difference.
If you are playing the wind @ Wrigley on a day to day basis you will lose more money than you will make. The wind changes every few hours at wrigley you just never know what to expect.