Rural resident hears prolonged vocals near Lumby witnessed in British Columbia, Canada

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This happened last night around 2:00am. The bedroom window was open, and I was woke up by a strange sound. I could hear dogs barking off in a distance. This sound was something I have never heard before. A high pitch cry or scream, that seem to have two different tones. I got up and went to the window just to listen. This call or scream continued for a good 10 minutes and seem to be over toward Hwy. 6 and Lumby. It was not a steady sound, it had periods of silence between each scream. It appeared to be a distance away from our house. I went in to my 21 year old sons room, woke him up and asked him to listen. At first he said it could be a coyote, but after he was fully awake, and listened, he said no, that he had never heard anything like it before. It finally drifted off toward the other side of the valley. It was definately high pitched with the second sound being a different tone. Its really hard to discribe. This is my first encounter with something of this nature. But w...