COMPARISON OF MEASURED X-BAND REFLECTIVITY FACTORS WITH THOSE DERIVED FROM S-BAND MEASUREMENTS AT HORIZONTAL AND VERTICAL POLARIZATIONS.

Measurements of horizontally (H) and vertically (V) polarized reflectivity factors at S-band Z//H//,//V**1**0) in rainfall along a given ray should provide adequate information to predict the behavior of the apparent reflectivity factor along the same path at attenuating wavelengths such as X- or C-band. This paper tests this hypothesis by comparing dual-wavelength measurements of (Z//H//,**1**0 Z//D//R) and Z//V**3') where Z//D//R is differential reflectivity at S-band and Z//V**3' is apparent reflectivity factor measured at 3cm wavelength with V polarization. Simultaneous dual-wavelength measurements of this type were obtained with the CHILL radar during SESAME on the evening of May 2, 1979 in an isolated thunderstorm which developed after the passage and south of the major squall line event of the day. Refs.