Observational analysis reveals tropical cyclone speed is linked to the outflow current in forecasting models.
Assuming the short-term forecasting guidelines of Lajoie and Nicholls (1974), upper wind observations indicate that the speed of movement of a tropical cyclone along the forecast direction of motion is equal to the component along that direction of the mean 'outflow' current measured slightly ahead of the downstream end of the outer cloudband and averaged from the surface to the top of the layer of cyclonic circulation.
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F. A. Lajoie (1976) studied this question.
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