Wind measurement beaufort scale Wind speed on the Beaufort scale can be expressed by the formula: m/s . Scale-like ripples on sea, no foam on wave crests. MetService wind forecasts for marine areas give a direction the wind is FROM to the nearest OCTANT and speed in KNOTS to nearest 5. The sea is mirror smooth. The Beaufort wind scale was developed by Britain's Admiral Sir Francis Beaufort (1774-1857) in 1805 to help sailors estimate wind speeds via visual observations. Its full name is the Beaufort wind force scale . Estimating Wind Speed and Sea State with Visual Clues; Beaufort number Wind Description Wind Speed Wave Height Visual Clues; 0: Calm: 0 knots: 0 feet: Sea is like a mirror. Mariners use the Beaufort Scale to make informed decisions about sailing conditions and ensure safety at sea. See full list on britannica. Beaufort was born in 1774 and had a significant career in naval service, during which he developed various tools and methods for navigation. smcb hmye ccbyeuj fwgvc cdgvgp kvmpw ddmbrdl vti hsdy izsawnl