Western Tanager in Valley Forge in January!!

I was walking in the woods across from the Chapel in Valley Forge yesterday when I saw a flash of yellow.  I set up my tripod and waited and the little flash came back and posed for a few shots.  I thought it might be a wayward yellow warbler, but after checking with my flicker friends it turns out this is a very rare sighting of a Western Tanager in January.  She should be somewhere in Central America by now.  And who said Al Gore was just an inconvenient truth.