A new method is proposed for simultaneously deducing a numberof rain and wind parameters from vertically pointing Doppler radarmeasurements. By assuming an exponential shape for the raindrop sizedistribution, the intercept N₀, slope λ, vertical air velocity andspectral broadening due to shear and turbulence can be estimatedfrom measurements of the skewness of the Doppler spectrum (thethird center moment) and reflectivity.The primary advantage of thistechnique is that it is relatively insensitive to Doppler spectralbroadening due to wind shear and/or turbulence. An error analysisis made by use of simulated Doppler spectra. The skewness calculatedfrom real data shows a coherent property. The technique how toproperly select the λ values will be discussed further.