What was this mysterious ‘siren or vacuum’ sound heard in Monument, Colorado end of March 2017?
There was no weather happening at the time, but the recorder lives near the United States Air Force Academy. Could it be related?
That’s really a mysterious sound! Anybody has an idea?
It’s a Siren heard it today during the freakish wind storm.
Yea they are just testing
1977 movie close encounter of the third kind
Like some of those frequencies u get in the YouTube.
I think a similar thing happened in Dallas the other day, right?
Here you go: http://strangesounds.org/2017/04/hacking-blamed-for-emergency-sirens-waking-up-dallas-early-saturday-video.html
Sounds like the Air Raid siren at the cross of Washington St and 1st Street
Sounds like a test of a tornado siren to me.