The first place to look is the metal products that are on your roof (Wind turbines, metal caps, etc). If they have noticeable dents in them, the shingles probably do also. Look in your gutters to see if the gritty granules on the face of the shingles have been knocked off and collected in the gutters. Look at your window screens skylights to see if they have been damaged. If branches and leaves have been broken from trees, damage has also occurred to your roof.