UNIDENTIFIED OBJECT Observed directly overhead San Francisco, California at approximately 0930 hours, 3 November 1950

This document consists of a series of reports and administrative correspondence regarding an unidentified aerial object sighting on 3 November 1950 in San Francisco, California. The primary report, filed by the 19th District Office of Special Investigations, details an interview with a railway employee who, along with eight to ten other workers at the Southern Pacific Freight Yard, observed a bright, round, white object in the sky. The witnesses estimated the object to be the size of a silver dollar and at an altitude of 20,000 feet. The object was observed for a duration of 20 to 30 minutes, during which it appeared to be suspended in the air before moving approximately 10 degrees across the sky. The witnesses reported no sound, no visible propulsion system, and no discernible aerodynamic features. The report notes that the observers were railway employees with no previous aeronautical experience. The administrative follow-up from the Department of the Air Force, dated 8 November 1950, indicates that the 19th OSI District forwarded the information to the Commanding General of the Air Materiel Command at Wright-Patterson Air Force Base. The Air Force concluded that no investigative action would be taken by the OSI office regarding the subject. The document package also includes technical meteorological charts (Skew T, log p diagrams) which appear to be reference materials for atmospheric analysis, though they are not explicitly linked to the investigation of this specific sighting.