Beaufort Scale of Wind Force
0 1 2 3 4 5 6 7 8 9 10 11 12 Calm Light Air Light Breeze Gentle Breeze Moderate Breeze Fresh Breeze Strong Breeze Moderate Gale Fresh Gale Strong Gale Whole Gale Storm Hurricane 1 1-3 4-7 8-12 13-18 19-24 25-31 32-38 39-46 47-54 55-63 64-75 76+ 1 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 41-47 48-55 56-63 64+
Scale     Force Rating          M.P.H         Knots