The Advanced Microwave Precipitation Radiometer (AMPR) was deployed in Jacksonville, FL for the initial AMPR instrument validation. AMPR data were collected at four microwave frequencies (10.7, 19.35, 37.1 and 85.5 GHz) for the period of 10 October 1990 through 19 October 1990. The purpose of the Jacksonville mission was to study convection over the land and ocean for validation, along with clear (dry) vertical columns of atmosphere over the ocean for calibration.