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Several advanced observation devices, such as ra-diosondes, satellites, and radars, are utilized in practical weather prediction. The weather radar is an essential device because of its broad coverage with excellent resolution. However, the radar inevitably observes meteorologically irrelevant signals. An anomalous propagation echo is a nonprecipitating echo generated by significantly refracted radar beam towards ground or sea surface. In the case, the radar misrecognizes the surface as afatcat:cbffyebuozgk7pv76ywencocma