Beaufort scale
System of recording wind velocity, devised by Francis Beaufort in 1806. It is a numerical scale ranging from 0 to 17, calm being indicated by 0 and a hurricane by 12; 13–17 indicate degrees of hurricane force.
In 1874 the scale received international recognition; it was modified in 1926. Measurements are made at 10 m/33 ft above ground level.
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