The Beaufort Wind Scale was devised in 1805 by the British Rear-Admiral Sir Francis Beaufort. It ranges in knots, from 0 (calm) to 64+ (hurricane). Other measurements are somewhat subjective descriptions of typical damage at land and at sea. 1805 was a common year starting on Tuesday (see link for calendar). ... A knot is a non SI unit of speed equal to one nautical mile per hour. ... This article is about weather phenomena. ...