Possible Late Night Encounter Outside Chelan witnessed in Chelan County, Washington

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in july of 2005 my friends and I were staying at the caravel hotel in chelan. We were staying with a friend and his family. After the few days were up, my friend and I decided to stay another day and sleep in the car that night. That night we drove to the top of a hill through some pretty thick woods on some really unkept dirt road until we reached a small clearing. We hung out for a while sitting on the hood of the car smoking cigarettes and watching shooting stars, looking for UFO's, and listening to animal noises. We'd often hear something then speculate what it was. Then all of the sudden we heard a very loud raspy scream/roar. I immediatley expected it was a cougar but about 1 second after the screech we heard 3 deep thuds in the earth as if someone was slamming a huge tree trunk against the ground. the thuds had an even rythem like someone knocking on a door. These thuds were immediatley followed by another scream and 3 more thuds, then a 3rd scream and 3 more thuds again. after ...