Straight line winds sometimes accompany thunder storms. The strength of these winds can lead to damage on your commercial roof by lifting panels, blowing gutters, and loosen flashings. Debris can also damage your roof surface. Damage from severe thunderstorm winds (exceeding 50-60mph) account for half of all severe damage reports in the continental United States. This is more common than tornado damage and can leave a path of damage that extends for hundreds of miles.