Report 23017: Possible vocalizations heard by resident outside Verlot

Neighbors dogs started becoming increasingly loud/threatening barking...went outside of my home, heard at a distance of approx. 1/2 mile a series of howls...start low and quickly rise to a scream. Incredible lung capacity! Every 5 seconds or so it would repeat. It appoached from the river (got louder)...moved west...still howling...then quickly moved south/back from the river up the terain....howling as it retreated..untill it wasn't discernable. I've hunted with friends in the Colorado Rocky's for black bear, elk...have heard their death throws. . .and I've NEVER HEARD ANYTHING LIKE THIS IN MY LIFE.