Have been following news accounts of their irruption. I'm too far south but can imagine the delight of birdwatchers in the central latitudes of the USA.
For the past 10-14 days a flock of black vultures has been roosting in the stand of trees that make a small wooded area across the road from my house. What a delight it is to watch them as they approach, circle, and then land in the tall trees.