9 February 1998 11:45
Sioux City, Iowa, USA
Driving into town, woman and adult son saw object, followed it about 3/4 mile at 70 mph, until they lost sight of it among hills.
An unidentified object was sighted, but with appearance and behavior that most likely would have a conventional explanation. One gray rectangular object, about 20 feet across, around 1500 feet away, was observed by two witnesses, typical age 50, in a rural area for 48 seconds. No sound was heard.
Hynek rating: DD: Daylight Discs
Vallee rating: FB1: A simple sighting of a UFO traveling in a straight line across the sky.
Other sightings in this areaGoogle map of this location.
Sources:
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