Abstract: The sea surface wind speed has a important impact on the navigation, ocean engineering and disaster prevision. In this paper, the observed wind data from Taiwan Island and South Korean was used to verify the validation of the T639 wind production during the typhoon “Fitow” and a cold air process. Results show that: (1) During the typhoon “Fitow”, there is a good consistency between the forecasting wind speed and the observed wind speed. (2) From the correlation coefficient, there is also a close relationship between the forecasting wind speed and the observed wind speed. About the Bias error, the forecasting value is slightly larger than the observed value. Comprehensive consideration of the root mean square error and mean absolute error, the precision of the T639 wind production is high. (3) During the typhoon “Fitow”, the T639 wind production can describe the characteristics of typhoon (including the typhoon eye and typhoon end mark) very well. The Waipu meteorology station, Dongjidao meteorology station and Lanyu meteorology station were effected by the typhoon noticeable but the Danshui meteorology station, Jinmen meteorology station and Lvdao meteorology station. The T639 wind production can also describe the cold air process very well.

Key words: the East China Sea, T639 forecasting wind products, observing wind speed, typhoon