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National UFO Reporting Center
Sighting Report
Occurred : 3/14/2015 22:45 (Entered as : 3/14/15 22:45)
Reported: 3/15/2015 6:54:24 AM 06:54
Posted: 3/20/2015
Location: Lake Geneva, WI
Shape: Unknown
Duration:2 minutes
Loud, long, low pitched rumbling over Geneva Lake, WI.

We didn't actually see a craft but heard a loud rumbling thunder, very close, that last over 2 minutes. It upset the cat even.

I thought the lake ice was cracking and my husband thought it was an aircraft. We didn't see any aircraft and there was not a storm.

I cannot find any records of anyone else hearing this noise.