Winds are categorized based on their intensity and the observed conditions they cause:
28–33 knots. Sea heaps up and white foam from breaking waves begins to be blown in streaks. gail force
41–47 knots. High waves; dense streaks of foam along the direction of the wind; sea begins to roll. Winds are categorized based on their intensity and
48–55 knots. Very high waves with long overhanging crests; the sea surface takes on a white appearance. Safety and Preparation Guide gail force