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- 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.
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- ADAPTATION (ADAPTABLE) PARAMETER, Algorithm, HDRAIN, Precipitation Processing System, Radar Coded Message, WSR-57, WSR-74, WSR-88D, WSR-88D System