What Un-Earthly Thing is Making These Sounds?

Kimberly Wookey is a woman from British Columbia who got a lot of hits online a few years ago, for posting a video of some weird sounds that seemed to be coming from the sky outside her house.  Well, it’s happened again and she's back.

She posted a new video of the exact same sounds, because she heard them outside her place again.  Experts have no idea what the sounds could be or what could be making them.

This is a quote from her YouTube post:

“This is NOT a fake or hoax. What I recorded is what we woke up to that morning. We still have no confirmed proven source, yet. I have the original files on my camcorder still which could be examined for authenticity.

This is the second time I personally have heard these sounds here in Terrace BC Canada. First time was June 19th 2013 at approx 9-9:30am but it was not quite as intense. On the morning of August 29th 2013 at approx. 7:30am I was awoken by these sounds. I shot out of bed realizing it was the same sounds I had heard before and I ran looking for a camera to try to capture them with. Came out into the living room to find my 7-year-old son awake and scared wondering what was going on.”

She went on to say “I personally do not believe this has any religious connection (I am a Secular Humanist) nor do I believe it is aliens, graders, trains, construction, etc. I do believe it could be a geophysical phenomenon.”

So, take a listen.  Do you have any idea what could be making this sound?