Joe,
Sorry but I feel I should clear somethings up. I wasn't sure that i was right and typed anyway. Since you seem to be interested in southwestern Va and Eastern TN. I feel I should made a better attempt since this is my region as well. I was looking into Richard Knight's book "The Birds of Northeastern Tennessee". He states that they are "Transient/ winter visitor in lowlands (rare Fall and Winter); local summer resident in mountains (occasional to uncommon Spring, Summer, Fall, rare Winter." I think that states everything. But I do want to stress that they can be found anywhere during Winter, Knight has records in Steele Park, Tn and on CBC for Bristol. He also list a few records from Bald Mountain, which is on the same range as Roam. This might help narrow your chances. But he talks about they are more easily found during a irruption year, which this is not. I hope that clears it up for you and for others that might follow the post.