knots 64-71, or higher and at sea the air is filled with foam and spray and the sea itself is completely white. From this level we are directed to the Saffir-Simpson Hurricane Scale. Beaufort ...

and through trees at or above 21 knots or 25 mph. These figures are averages, but are generally cited in what's called the Beaufort scale.

According to Surfer Today, a gale is a powerful surface wind, categorised between 7 and 10 on the Beaufort Wind Force Scale .

An exceptionally strong "shamaal" with winds gusting up to 38 knots (a force 8 gale on the Beaufort Wind Scale) surprised the UAE yesterday, uprooting several trees, felling lamp poles ...