The possibility of wind damage is a continuing and important factor in the design of structures such as bridges, cooling towers, high buildings, and roof attachments. In addition, even adequately designed tall buildings may cause extremely annoying wind movements at ground level at the base of the building. Structural failure due to winds varies geographically. Hurricanes, cyclones and typhoons are frequent in some areas and structures in equatorial regions may have greater exposure to atmospheric turbulence than elsewhere.