Gail Force Official

28–33 knots. Sea heaps up and white foam from breaking waves begins to be blown in streaks.

48–55 knots. Very high waves with long overhanging crests; the sea surface takes on a white appearance. Safety and Preparation Guide gail force

Gale force winds can cause structural damage to roofing and siding and create life-threatening conditions for mariners. Weather Spotter's Field Guide - Non-supercell Tornadoes 28–33 knots

34–40 knots. Moderately high waves of greater length; edges of crests break into spindrift. sea begins to roll.

41–47 knots. High waves; dense streaks of foam along the direction of the wind; sea begins to roll.