Under the assumption that the horizontal wind vectors of two neighboring azimuths are uniform, the horizontal wind components can be derived in real time by single-Doppler radar velocity-azimuth processing (VAP) technique. Most applications, especially meteorological research for data assimilation, require quality-controlled wind field. Therefore, an extension of VAP, called qualified VAP, is presented in this study. The simulated data experiments are studied first to test the strength and weakness of the method. An observed case of stratiform precipitation in a front system is used to further examine the performance of the qualified VAP retrievals. The accuracy of the retrieval for this real case is examined against the aircraft data and a second radar observation. The verification shows that the qualified VAP technique can produce a reasonable description of the wind structure.