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Wind

Beaufort scale developed in 1805 by Sir Francis Beaufort of England

Beaufort   knots   metre/sec   Classification     
F 0          <1      <0.5              Calm                   
F 1          1- 3    0.5 - 1.5        Light Air             
F 2          4- 6    2 – 3             Light Breeze        
F 3          7-10    3.5 – 5          Gentle Breeze    
F 4         11-16   5.5 – 8          Moderate Breeze  
F 5         17-21   9 - 10.5         Fresh Breeze       
F 6         22-27   11 - 13.5       Strong Breeze       
F 7         28-33   14 - 16.5       Near Gale            
F 8         34-40   17 - 20.5       Gale                   
F 9         41-47   21 – 24         Strong Gale           
F10        48-55   24.5 – 28       Storm                 
F11        56-63   28.5-32.5       Violent Storm     
F12        64+      33 - 41          Hurricane             

See Wikipedia entry

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