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Rain retrieval from dual‐frequency radar Doppler spectra: validation and potential for a midlatitude precipitating case‐study

A recently developed technique retrieving the binned raindrop size distributions (DSDs) and air state parameters from ground‐based Ka and W‐band radars Doppler spectra profiles is improved and applied to a typical midlatitude rain event. The retrievals are thoroughly validated against DSD observations of a 2D video disdrometer and independent X‐band observations. For this case‐study, profiles of rain rate, R, mean volume diameter and concentration parameter are retrieved, with low bias and standard deviations. In light rain (0.1 < R < 1 mm h−1), the radar reflectivities must be calibrated with a collocated disdrometer which introduces random errors due to sampling mismatch between the two instruments. The best performances are obtained in moderate rain (1 < R < 20 mm h−1) where the retrieval is providing self‐consistent estimates of the absolute calibration and of the attenuation caused by antenna or radome wetness for both radars.