"High wind" is typical of wind speeds that place a seven on the Beaufort scale. When wind travels this fast (approximately 32 to 38 miles per hour), the sea heaps up. Streaks of foam from breaking waves are blown in the direction the wind is traveling, and there are moderate amounts of airborne spray. On land, high wind moves entire trees, and effort is required to walk against it.
See Special:Whatlinkshere/Etymology:Highwind for a list of articles using this term.