RAdar DAta Processor II, attached to some WSR-57 and WSR-74 radar units. It automatically controls the tilt sequence and computes several radar-derived quantities at regular intervals, including VIL, storm tops, accumulated rainfall, etc.
RADAP II
Meaning of RADAP II in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012