Knoxville, Tennesse, September 1949September 1949

On September 1, 1949, two teenagers on a camping trip near Knoxville, Tennessee spotted an unusual object in the sky. The witnesses, both students at Central High School, said they saw a disc-shaped object flying overhead at very high altitude and moving fast. They estimated it was traveling between 40,000 and 50,000 feet. The object appeared metallic, like material used in aircraft construction. It flew from northeast to southwest in level flight, and the witnesses watched it for about two and a half to three minutes. There was no sound, no exhaust, and no vapor trail. The sky was clear and there was no wind at ground level.

The Air Force investigation focused on whether weather balloons might explain the sighting. Investigators collected detailed wind data from the U.S. Weather Bureau for September 1, 1949, including measurements from stations in Knoxville, Chattanooga, Nashville, Atlanta, Greensboro, Roanoke, and Spartanburg. The Weather Bureau confirmed it had released balloons at four different times that day (0400 hours, 1000 hours, 1600 hours, and 1757 hours, which is 4:04 a.m., 10 a.m., 4 p.m., and 5:57 p.m.). The agency also noted that no instruments were attached to the balloons released from Knoxville.

The Air Force agents who interviewed the witnesses noted they were intelligent young men who answered all questions without hesitation. One witness was 18 years old and had studied aeronautics for two years. The investigation concluded on September 12, 1949, though the file does not state a final determination of what the object was.

The complete case file, consisting of 11 pages as held by the National Archives, is reproduced below.