Without getting into physics and all that stuff, I'll try to explain it. You have an object ( which is your arrow) being propelled by a certain force ( which is you bow) at a certain speed. Any type of force that comes in contact with your arrow can cause some type of deflection The harder the force that is pushing against the object the more the object moves.Basically, in 5mhp winds, the force against your arrow is minimal so your arrow flight and movement will be minimal. In 30mph winds the force is greater so there will be a greater amount of movement in your arrow. Hope this helps.