Definitions for "Strong gale"
Keywords:  beaufort, mph, knots, topple, gale
Wind with a speed between 41 and 47 knots (47 and 54 mph); Beaufort scale number 9.
Beaufort force 9. A sustained wind speed of 41 to 47 knots. High waves; dense streaks of along the direction of the wind. crests of waves begin to topple, tumble and roll over; spray may affect visibility.
wind moving 47-54 knots; 9 on the Beaufort scale