It is impossible to say whether the storm will move north or south of Lakeland. As Jason mentioned, the wind field is so large that we shouldn't concern ourselves with the exact center. Even south of the center, winds are going to be strong. I think in your location you may experience hurricane force gusts, but more than likely, locations from central Polk county westward will experience 40-60mph sustained winds with gusts of 70mph. Frances' wind field is so large that all of the inland peninsula will experience quite a bit of wind.