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Faceted archive of NUFORC reports — filter by shape, place, and decade. Every URL is deterministic SSR (cacheable at the edge).
Burlington · IA, USA
A witness in Burlington, Iowa reported a circular object moving slowly before abruptly changing direction and accelerating rapidly, over about 90 seconds in June 1957.
Sioux City · IA, USA
An Air Force radar station near Sioux City, Iowa reportedly tracked an object at 50,000 to 80,000 feet, moving 1,200 to 1,800 mph, for about 30 seconds in January 1954.