One star was observed.

Condon Report: 1323-B. Sault Saint Marie AFB, Mich., 18 September 1966, 0100 LST. Weather: clear, calm. There is a very brief Blue Book file on this incident. Two sergeants of the 753rd Radar Squadron saw a bright light, ellliptical in shape and apparently multicolored of unsaturated hues, which appeared low over the treetops to the SE and moved in a straight line toward the west, disappearing "instantaneously" in the WSW. Duration of this sighting was 2-5 sec. The report states that the object was also tracked by a long-range AN/FPS-90 heightfinder with azimuth, range, and altitude "available on request." Since this information is not included in the folder, no firm conclusion may be reached as to the probable cause of the radar sighting or even as to whether or not the radar and visual objects were correlated.

The general visual appearance, brightness range, motion and mode of disappearance are all compatible with the hypothesis that the object was a large meteor. Some large meteors display even more unusual appearance than this report. If it was a meteor, the radar may have actually tracked it; radar tracks of large meteors are not unknown. Of course, the radar track may have been spurious, or may have indicated that the object was unnatural. The tracking data would be required to settle the point.

The radio refractivity profile for 0600 LST, shown if Fig. 3 indicates that an intense super-refractive layer existed within the first 372 m. (1220 ft.) above the surface. This profile is conducive to the formation of AP echoes on ground-based radar, so there is some possibility that the observed radar data in this UFO incident may have been spurious. This case would seem to merit further investigation.

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