UFOB Index Card AISS-UFOB-372-55

This document is a UFOB Index Card (AISS-UFOB-372-55) documenting an unidentified aerial phenomenon sighting that occurred over Minneapolis, Minnesota, on October 21, 1955. The report details two distinct sets of observations: an 'Air-Visual' sighting and an 'Air-Electronic' (radar) sighting. The visual observation, lasting approximately two seconds, described a glowing white, oblong object with a fuzzy rear edge, moving at an estimated speed of 1000-1500 mph at an altitude of 2,500 feet. The object was observed moving west before making a ninety-degree turn to the north. The electronic observation, lasting 15 to 20 seconds, tracked an oblong object with fuzzy edges at an altitude of 20,000 feet, moving east at approximately 1000 knots. The report notes that the object appeared smaller than a pea and was estimated to be at 7 miles distance, later appearing to be at 15 miles. The document includes meteorological data, specifically a Skew T, log p diagram, which contains handwritten notes referencing 'Rapid lowering of air (not too strong)' and 'Radiational cooling,' leading to the official conclusion that the phenomenon was caused by a temperature inversion. The file indicates that a request was sent to the Air Technical Intelligence Center (ATIC) to forward radar data sheets for further analysis, with the intent to update the card upon receipt of their findings.