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Published online by Cambridge University Press: 18 January 2010
In this paper values for the accuracy with which the meteorological forecaster can assess a route wind at 40,000 feet between London and Rome from his chart are suggested, and the accuracy with which he can forecast what the route wind will be is then calculated. These figures are then compared with an estimate of the accuracy of route winds derived from the navigation of aircraft over the route. Estimates of the errors that are likely to occur in wind forecasts for various air routes in operation or in contemplation are then made and a method of using wind forecasts is suggested.