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National UFO Reporting Center
Sighting Report
Occurred : 5/4/2015 10:00 (Entered as : 5/4/15 10:00)
Reported: 5/4/2015 9:21:59 AM 09:21
Posted: 5/8/2015
Location: Longmont, CO
Shape:
Duration:30 Seconds
Sky howling. Frequency sweep heard, almost like a siren.

10:07. I am at my computer. I hear sirens outside, but they seem strange so I go to my window to listen, and I realize that the sound is coming from the sky. The sound would slowly sweep from what sounded like, 900Hz to 230hz and upon reaching the low end jump back up to 900 and restart the sweep.

The frequency was incredibly smooth, and it had an echo to it. It was about as loud as a low flying commercial jet liner. There was also some resonant audible noise behind it. I rushed to get my camera and run outside but in the 10 seconds that I did that the sound went away. We've sure been having some strange weather…


((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))