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National UFO Reporting Center
Sighting Report
Occurred : 4/9/2016 19:50 (Entered as : 04/09/2016 19:50)
Reported: 4/10/2016 1:00:38 PM 13:00
Posted: 4/15/2016
Location: Lamberton, MN
Shape: Unknown
Duration:5 minutes
Pulse detonation engine contrail.

I was in my hot tub watching a TV show on my Kindle and I heard a popping noise, so I paused the show. (I had the cover on the hot tub which is normal for me when it is cold, but there was also a very cold wind so I was actually under the cover at the time.) The sound also kinda sounded like a basketball being dribbled during the second half of the event - which is plausible since I could hear kids in the neighborhood.

I was facing southwest at the time and the only thing unusal I noticed was a doughnuts on a rope contrail at the 2 o'clock position.

I did NOT actually see the plane that made the contrail.

During the last year I have seen this type of contrail over Lamberton 2 to 3 times and 1 or 2 times over Wabasso Minnesota. Always in a west to east / east to westly direction.