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In order to study the role of wind profile data in rain storm forecasting, a rain storm event in Dali between 1 and 2 June 2008 is analyzed. The variation of threedimensional fluctuating wind field was noticeable before precipitation, and there was the vertical velocity shear of horizontal winds, and the maximum sounding height increased. By means of the wind profile data, the characteristics of precipitation can be judged. There appeared a doublepeaked power spectra density during precipitation, and the velocities of the vertical stream and the sinking particles can be determined.