Howls heard near Spokane River witnessed in Spokane County, Washington

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Heard: at approx 2:15am my labrador retriever started barking at something outside. This is not unusual as we live on a closed golf course which is adjacent to Riverside State Park and we often have varying types of nature near our home. After letting the dog out to relieve himself I returned to bed. Outside temp was approx 55-60 degrees and we had the bedroom windows open. Our bedroom faces the closed golf course. What I heard next was a loud howl. At first I thought it was a police car or ambulance traveling on highway 291 that had turned on its siren, but then the sound simply went from soft to loud to suddenly stopping. So, it was not a siren. I listened intently to try to figure out what was going on and about 2 minutes later I heard a similar but more faint "siren" sound. This was not a coyote or a wolf, nor was it the sound of a neighbor's dog. The sound was different and as I said, it sounded like a siren with only one whooooooo. I noted the time (2:20am). It soun...