Race: Dragon-kind Difficulty:Elite Aggro:Aggressive Level: 49 Max Morale: 9,442 Max Power: 1,247 Found in Zones:Misty Mountains Location: 20.4S, 2.3W Send a correction
As of the latest content and patch on Book 7 I believe now he may spawn during the day. While doing my GRD Snow Beast deed I came across him in the afternoon after starting to clear the area around the 'noon' in-game. He was sitting at the 'U' in Bruinen in the North Bruinen Source.
I don't remember the instance name, but I found this named just south of the book5 chapter8 instance where you fight the nazgul. Oh, and he isn't in Angmar but in Misty Mountains and a lvl 49 Elite snow beast.