31.   There were no weather problems and Cala said ground radar and radio systems were operating normally.

32.   They also were trying to pin down whether ground radar, out of service for months while a new system is being installed, might have prevented the crash.

33.   They were also trying to pin down whether ground radar, out of service for months while a new system is being installed, could have prevented the crash.

34.   Tornadoes touched down near Denver International Airport Wednesday night, briefly grounding flights and damaging ground surveillance radar.

35.   With such poor visibility, ground radar could have warned air traffic controllers the Cessna was in the wrong place, experts said.

36.   Ground radar then picked up two targets, and then multiple targets just before the plane, burning by now, disappeared into the sea.

37.   Ground radar then picked up two targets, and then multiple targets just before the plane, by now in flames, disappeared into the sea.

38.   Efforts to trace the Express had been abandoned as ground radar could not confirm the altitude of the unmanned satellite and there was no radio contact, he said.

39.   Jiji Press and other reports said that ground radar could not confirm the altitude of the satellite and there was no radio contact with the space vehicle.

40.   Satellite imaging, infrared sensing, anomaly sensors and what he called ground penetrating radar were all used.