41–47 knots. High waves; dense streaks of foam along the direction of the wind; sea begins to roll.
34–40 knots. Moderately high waves of greater length; edges of crests break into spindrift. gail force
48–55 knots. Very high waves with long overhanging crests; the sea surface takes on a white appearance. Safety and Preparation Guide 41–47 knots
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 41–47 knots. High waves