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USAF record 28953380

28953380

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1. DATE - TIME GROUP 13 Feb 53 14/0258Z

2. LOCATION San Francisco, California

3. SOURCE 3 Cly. min

4. NUMBER OF OBJECTS [REDACTED]

5. LENGTH OF OBSERVATION 22 Minutes

6. TYPE OF OBSERVATION Ground-Visual

7. COURSE [ILLEGIBLE] ONCE

8. PHOTOS No

9. PHYSICAL EVIDENCE No

10. CONCLUSION WEATHER PHENOMENA Report of objects attributed to effects of inversion in Area.

11. BRIEF SUMMARY AND ANALYSIS Round black object followed by 2 silver streaks appearing to be vapor trails traveled at a high rate of speed maneuvering up and down on zig zag course. A throbbing sound was heard as the obj passed overhead at alt of approx 10,000'. The obj passed overhead at alt of approx 10,000' on 4th Feb 53. An astronomer said that sightings were result of a temperature inversion.

FORM FTD SEP 63 0-329 (TDE) Previous editions of this form may be used.

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