Definition
Runs from force 0 to force 12, with wind speeds specified as ten minute means at 10 metres height. Force 0 is under 1 knot, 1 is 1 to 3, 2 is 4 to 6, 3 is 7 to 10, 4 is 11 to 16, 5 is 17 to 21, 6 is 22 to 27, 7 is 28 to 33, 8 is 34 to 40, 9 is 41 to 47, 10 is 48 to 55, 11 is 56 to 63, and force 12 is 64 knots or more.
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