Finally a fall warbler to look at. Surely there must be more photos out there, not
implying that your valued photo is exactly "out there". I'm thinking Tennessee
warbler because of the sharp narrow bill, rich olive back, lack of wing bars
and light eye brow that extends distally. The eye line is a little weak but it may
be immature. I've attached a few shots of what I concluded was an immature
Tennessee warbler. The eye brow is quite pronounced but I can't think of any
other warbler with such a prominent brow except for Palm and female BT Blue.