Case file · Anomaly hotspot

Lake Michigan Triangle

Disappearances and light sightings over the great lake, incl. the 1950 vanishing of Flight 2501.

1937 CE · 43.50, -87.00 · status: folklore

The researched reading

A collection of genuine tragedies on a stormy inland sea, given a shape and a name. Each case has a natural setting that is enough to explain it.

Explanation	Weight	Why
A known natural phenomenon	55%	Northwest Orient Flight 2501 (23 June 1950) vanished while flying into a squall line over the lake; debris and an oil slick were found but not the wreck, and the CAB could not fix a cause. Great Lakes storms, sudden seiches (the 1954 Chicago seiche) and cold water have sunk thousands of vessels.
Something known, misidentified	14%	Unrelated incidents across decades (Captain Donner vanishing from his ship in 1937, the 1950 flight, lights over the water such as the March 1994 sightings reported along the Michigan shore) are grouped into one “triangle”.
Perception, memory or mind	9%	Once named, the zone attracts and shapes reports.
Undetermined	7%	The share the reading had given to fabrication on doubt rather than evidence: the record does not settle it either way.
A hoax or fabrication	5%	Retellings embellish: details of the Donner case and of “vanishings without trace” are inflated in online lists.
A poorly understood natural phenomenon	5%	Rare lake phenomena (meteotsunamis, freak waves called “three sisters”) are only partly understood.
Secret human technology	3%	Military aircraft operate over the lakes; occasional light sightings may be such flights.
Genuinely anomalous	2%	Some light reports remain unexplained in detail, but the disappearances need nothing unusual.

Official position: The CAB found the probable cause of Flight 2501 undeterminable; no authority recognises a special zone.