A wind advisory is generally issued by the National Weather Service of the United States when there are sustained non-thunderstorm winds of 31–39 miles per hour (50–63 km/h) and/or gusts of 46–57 miles per hour (74–92 km/h) over land. Winds over the said cap will trigger high wind alerts rather than an advisory. The advisory is site specific, but winds of this magnitude occurring over an area that frequently experiences such wind speeds will not trigger a wind advisory.