Some of us went birding to Plum Island this morning. As soon as we reached the salt pannes, we met an individual who was excitedly looking at this bird which he identified as a Black-throated Gray Warbler. I did manage to take some photos which seem to confirm his identification. Photos are not sharp but are clear enough to match the description provided by allaboutbirds.org : "Small warbler with a black-and-white face, gray back, and black side streaks. Adult males have black throat and a yellow spot in front of the eye." It looks like the yellow spot in front of the eye might be a distinguishing feature.
Looking at the distribution map, it looks like a West Coast bird. Are they known to be vagrants in these parts? Or is it a different bird species? What do the experts think?