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  • Author or Editor: I. Zawadzki x
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R. Rabin and I. Zawadzki


The relationship between convective scales in the pre-storm environment and Doppler measurements of divergence is discussed with attention to problems inherent in radar measurements. A method is suggested to minimize the effects of beam smoothing and reflectivity weighting. A case study indicates the possibility of operational short-term forecasting of the onset time of precipitation from the radar measurements of divergence.

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D. Caya and I. Zawadzki


A critical review of the velocity-azimuth display (VAD) analysis for the retrieval of wind, divergence, and deformation from single-Doppler observations is presented. It is shown that in situations when the linear wind assumption is not valid the VAD analysis leads to incorrect conclusions. The range and height dependence of single-Doppler data contains information on the nonlinearity of the wind field and allows a generalized analysis by which vertical profiles of wind, divergence, and deformation at the radar site can in principle be obtained. These ideas are illustrated by two case analyses of single-Doppler observations in clear air.

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