American Isotach Wind Map

  1. Values are 3-second gust speeds in miles per hour (m/s) at 33ft (10m) above ground for Exposure C category and are associated with an annual probability of 0.02.
  2. Linear interpolation between wind speed contours is permitted.
  3. Islands and costal areas shall use wind speed contour or coastal area.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.

PDF Version of American Isotach Wind Map

american isotach wind map