Abstract: In order to monitor precipitation weather using wind profile radar, the characteristics of wind profiler radar data at the different stages of rainfall including formation, development, and dissipation were discussed and the correlations between vertical velocity, velocity spectrum width detected by the profile radar and rainfall intensity were analyzed according to the comparison and the correlation analysis between the boundary wind profile radar data and the automatic weather station data during a spring precipitation process of 2006 in Nanjing. The results indicate that holes in the horizontal wind profile gradually disappear as rainfall approaches , while holes appear again as rainfall ends, and precipitation increases obviously after low level jet appears. The vertical velocity, velocity spectrum width and refractivity structure constant increase obviously when precipitation appears. The correlation between vertical velocity below the 550 m height level and precipitation is significantly negative, while it is significantly positive between velocity spectrum width from 450 m to 950 m height level and precipitation, namely, rainfall intensity is greatly likely to be stronger when the negativevertical velocity is smaller or spectrum width is bigger. The above results reveal the relationships among wind profile vertical velocity, velocity spectrum width and precipitation intensity, which could be applied to the monitoring of precipitation weather.

Key words: Wind profiler radar, Horizontal wind profile, Vertical velocity, Velocity spectrum width, Refractivity structure constant, Rainfall process