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Manual on Marine Meteorological Services: Volume I – Global Aspect (PDF). World Meteorological Organization. 2012. Archived from the original (PDF) on 5 May 2017.
McIlveen, Robin (1991). Fundamentals of Weather and Climate. Cheltenham, England: Stanley Thornes. p. 40. ISBN 978-0-7487-4079-6. The Beaufort Scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale. Wetterlexikon - Beaufort-Skala" (in German). Deutscher Wetterdienst. Archived from the original on 12 December 2013 . Retrieved 14 February 2014. The knot has had various definitions throughout history. The United States and United Kingdom in particular used their own specific nautical miles up until 1954 and 1970 respectively. The US nautical mile is defined as 1,853.248 m while the UK Admiralty nautical mile is equal to 1853.184 m, compared to the international nautical mile of 1,852 m.
Approximate result
Very high waves with long overhanging crests; resulting foam in great patches is blown in dense white streaks along the direction of the wind; on the whole the surface of the sea takes on a white appearance; rolling of the sea becomes heavy; visibility affected Large waves begin to form; the white foam crests are more extensive everywhere; probably some spray
This means that you can convert MPH to knots by dividing the knot measurement by 1.15078. In other words, the MPH to knot conversion formula is as follows: The Beaufort scale is neither an exact nor an objective scale; it was based on visual and subjective observation of a ship and of the sea. The corresponding integral wind speeds were determined later, but the values in different units were never made equivalent. [ clarify] The Beaufort scale / ˈ b oʊ f ər t/ is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale. We can also convert by utilizing the inverse value of the conversion factor. In this case 1 mile per hour is equal to 0.021724406047535 × 40 knots.For practical purposes we can round our final result to an approximate numerical value. We can say that forty knots is approximately forty-six point zero three one miles per hour: Alternatively, you can also multiply the MPH measurement by 0.868976 to convert it into its knot equivalent: a b c Saucier, Walter Joseph (1955). Principles of Meteorological Analysis. Chicago: The University of Chicago Press. OCLC 1082907714. , reprinted in 2003 by Dover Publications. Current use: Along with km/h, mph is most typically used in relation to road traffic speeds. It is most widely used in the United States, the United Kingdom, and their related territories. It is also used in the Canadian rail system, though the Canadian road systems use km/h.